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Major magnitude 8.2 earthquake - 104 Km SE of Perryville, Alaska, on Thursday, 29 July 2021 at 06:15 (GMT) - information

Major mag. 8.2 Earthquake - Chignik Earthquake, Gulf of Alaska, on Wednesday, Jul 28, 2021, at 09:15 pm (GMT -9)

A powerful magnitude 8.2 earthquake occurred in the Gulf of Alaska 78 km (48 mi) from  United States in the evening of Wednesday, Jul 28, 2021 at 9.15 pm local time (GMT -9). The quake had a very shallow depth of 32 km (20 mi) and was felt over a large region. The shallow depth of the quake caused it to be felt more strongly near the epicenter than a deeper quake of similar magnitude would.

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Major mag. 8.2 Earthquake - Chignik Earthquake, Gulf of Alaska, on Wednesday, Jul 28, 2021, at 09:15 pm (GMT -9) Major mag. 8.2 Earthquake - Chignik Earthquake, Gulf of Alaska, on Wednesday, Jul 28, 2021, at 09:15 pm (GMT -9)
Major magnitude 8.2 earthquake at 32 km depth
29 Jul 06:20 UTC: First to report: USGS after 5 minutes.
29 Jul 06:22: Magnitude recalculated from 7.2 to 7.3. Hypocenter depth recalculated from 35.0 to 3.4 km (from 22 to 2.1 mi). Epicenter location corrected by 0.9 km (0.6 mi) towards S.
... [show all] ...
29 Jul 07:40: Hypocenter depth recalculated from 46.7 to 32.2 km (from 29 to 20 mi). Epicenter location corrected by 17 km (10.7 mi) towards SSE.
Update Thu, 29 Jul 2021, 17:31

Largest quake in the U.S. in 50 years sends seismic waves across the globe

Seismic waves of the Alaska earthquake earlier today recorded on Etna's ESVO seismic station in more than 9000 km distance (image: INGV Catania)
Seismic waves of the Alaska earthquake earlier today recorded on Etna's ESVO seismic station in more than 9000 km distance (image: INGV Catania)
Map of the location the M8.2 Chignik Earthquake in relation to the 2020 M7.8 Simeonof Earthquake-aftershock sequence and rupture patches for other historic earthquakes (image: Alaska Earthquake Center)
Map of the location the M8.2 Chignik Earthquake in relation to the 2020 M7.8 Simeonof Earthquake-aftershock sequence and rupture patches for other historic earthquakes (image: Alaska Earthquake Center)
The earthquake's powerful seismic waves traveled the globe and were recorded by seismic stations access.
Attached is an example how the quake showed up on a seismogram from a monitoring station at Mt. Etna volcano in Sicily, more than 9000 km (5600 mi) away.
Fortunately, the quake did not result in any reported significant damage, thanks to its remote location and distance from inhabited placed. Here's a video showing how shaking occurred inside a house in Cold Bay:

Largest quake in the U.S. in 50 years
This morning's quake (or yesterday evening's, as it struck at 10:15 pm Alaska time on 28 July), was the largest earthquake recorded in the U.S. in 50 years. It is now called the "Chignik Earthquake".
No significant tsunami
At an intermediate depth of approximately 28.5 miles is was an intermediate-depth earthquake, and fortunately only resulted in a very small and not dangerous tsunami - things could have easily be different had the quake occurred at shallower depth as originally feared.

It occurred relatively close (about 45 miles) to the location of the M7.6 Simeonof Island Earthquake on 21 July 2020; according to the Alaska Earthquake Center, these two large quakes seem to be related. Both occurred along the boundary where the Pacific ocean plate slides (subducts) beneath the North America plate:
"The Alaska Peninsula is a seismically active region where thousands of earthquakes occur each year. The largest earthquakes are located along the interface, which is called the Aleutian megathrust. The M8.2 event ruptured this interface in the region between the Shumagin Islands to southwest and Kodiak Island to northeast. Previously, the 1938 M8.3 earthquake ruptured this section of the interface."

Source and further reading: Largest earthquake in 50 years: What we know so far (Alaska Earthquake Center)
Update Thu, 29 Jul 2021, 08:48

Only minor tsunami confirmed - wave heights less than 1 ft

There's good news for the northern Pacific: only a small tsunami has been confirmed and some (minor) impacts are expected for some coasts in South Alaska and the Alaska Peninsula, the latest message of the U.S. Tsunami Warning System reads.
The warning was lifted for most areas or downgraded to an advisory, in particular for the coastal areas from Hinchinbrook Entrance, Alaska (90 miles E of Seward) to Unimak Pass, Alaska (80 miles NE of Unalaska), as well as the Aleutian Islands, from Unimak Pass, Alaska (80 miles NE of Unalaska) to Samalga Pass, Alaska (30 miles SW of Nikolski).
Maximum observed wave heights were less than 1ft (30 cm).
The Tsunami Advisory is canceled for the coastal areas of Aleutian Islands from Samalga Pass, Alaska (30 miles SW of Nikolski) to Amchitka Pass, Alaska (125 miles W of Adak).

Link to full advisory: Latest Tsunami message
Read all
Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online: Android | iOS

Earthquake details

Date & timeJul 29, 2021 06:15:47 UTC
Local time at epicenterWednesday, Jul 28, 2021, at 09:15 pm (GMT -9)
StatusConfirmed
Magnitude8.2
Depth32.2 km
Epicenter latitude / longitude55.3248°N / 157.8414°W Gulf of Alaska, Alaska, United States
Seismic antipode55.3248°S / 22.1586°E
Shaking intensityVIII Severe shaking near epicenter
Felt102 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoVeniaminof (137 km / 85 mi)
Weather at epicenter at time of quakeOvercast Clouds 12°C (54 F), humidity: 89%, wind: 7 m/s (14 kts) from SSW
Estimated seismic energy released1.3 x 1017 joules (34970 gigawatt hours, equivalent to 3 x 107 tons of TNT or 1880.6 atomic bombs!) | about seismic energy
[smaller] [bigger]

Additional info

Reference #1053:
Tectonic Summary 
The July 29, 2021, (July 28, 2021 local time) M8.2 earthquake southeast of Perryville, Alaska (south of the Alaska Peninsula), occurred as the result of thrust faulting on or near the subduction zone interface between the Pacific and North America plates. The preliminary focal mechanism solution indicates rupture occurred on a fault dipping either shallowly to the northwest, or steeply to the southeast. The location, mechanism and depth – and the large size of the event – are all consistent with slip occurring on the subduction zone interface between the two plates. At the location of this event, the Pacific plate converges with North America to the northwest at a rate of about 64 mm/yr, subducting at the Alaska-Aleutians trench ~125 km to the southeast of the earthquake. 
While commonly plotted as points on maps, earthquakes of this size are more appropriately described as slip over a larger fault area. Reverse faulting events of the size of the July 29 earthquake are typically about 200x80 km in size (length x width).
Large earthquakes are common in the Alaska-Aleutian subduction zone. Since 1900, 8 other earthquakes M7 and larger have occurred within 250 km of the July 29, 2021 event, including earthquakes of M7.8 on July 22, 2020 (located 62 km west of the July 29, 2021 event) and M7.6 on October 19, 2020 (located 145 west of the July 29, 2021 event). Given the temporal and spatial proximity of the July 29, 2021 earthquake to the two previous large earthquakes in July and October 2020, those previous events were foreshocks of the July 2021 earthquake. An earthquake of M8.2 also occurred on November 10, 1938 within 40 km of the July 29, 2021 event. While initial information is incomplete, the July 29 earthquake may have ruptured partially or completely into the ruptured region of the 1938 earthquake. 
The Alaska-Aleutian Trench also hosted the second largest earthquake recorded by modern seismic instrumentation, the M9.2 March 27 1964 earthquake, which ruptured to within about 250 km of this event, at the eastern end of the 1938 rupture area. The 1938 event produced a small tsunami that was recorded both locally and in Hilo, Hawaii. The remote location of the earthquake resulted in little impact to people and infrastructure.

Cited references

  • #1053 National Earthquake Information Center (NEIC) (1971 to 2013):

    Preliminary Determination of Epicenters (PDE), a weekly and monthly publication, National Earthquake Information Center, U.S. Geological Survey, Golden, Colorado, 1971 to 2013.

Source: NOAA National Centers for Environmental Information (NCEI), Global Significant Earthquake Database. doi:10.7289/V5TD9V7K

Nearby places

The closest larger town where the quake might have been felt is Perryville, a town with 113 inhabitants in the United States, in 105 km (65 mi) distance northwest of the epicenter. People likely experienced very strong shaking there.
The following table shows some of the places that might have been affected (or not) by the shaking.
Distance Place Max. shaking intensity(*) Region Country
105 km (65 mi)
NW of epicenter
 Perryville
(pop: 113)
VII: Very strong
 Lake and Peninsula, Alaska
113 km (70 mi)
N of epicenter
 Chignik
(pop: 87)
VII: Very strong
 Lake and Peninsula, Alaska
118 km (74 mi)
NW of epicenter
 Chignik Lake
(pop: 73)
VII: Very strong
 Lake and Peninsula, Alaska
168 km (104 mi)
W of epicenter
 Sand Point
(pop: 1,060)
VI: Strong
 Aleutians East, Alaska
187 km (116 mi)
N of epicenter
 Port Heiden
(pop: 98)
VI: Strong
 Lake and Peninsula, Alaska
286 km (178 mi)
W of epicenter
 King Cove
(pop: 1,010)
VI: Strong
 Aleutians East, Alaska
382 km (237 mi)
N of epicenter
 Naknek
(pop: 544)
VI: Strong
 Bristol Bay, Alaska
412 km (256 mi)
NE of epicenter
 Womens Bay
(pop: 719)
VI: Strong
 Kodiak Island Borough, Alaska
421 km (261 mi)
NE of epicenter
 Kodiak Station
(pop: 1,300)
V: Moderate
 Kodiak Island Borough, Alaska
431 km (268 mi)
NE of epicenter
 Kodiak
(pop: 6,250)
V: Moderate
 Alaska
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake (158)

We received 156 reports for this quake.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
Leave a comment if you find a particular report interesting or want to add to it.
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Hope, Alaska - Porcupine USFS Campground / Light shaking (MMI IV) / vibration and rolling / 30-60 s : We were in our 5th wheel camped in a site above Turna | 60 users found this interesting.  
  • A lot I left it on, on purpose idiots
  • Sending love from Ohio.
  • How many minutes did the shaking last?
  • Hope is a neat little spot. Sure hope you’re all safe there. We love Alaska. Kiwi campers.
  • Sending love from Alabama
  • Hopefully no Tsunami will come. Stay safe.
Anchorage, Alaska / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 minutes : 9th floor of the Sheraton Anchorage hotel & Spa and majority of hotel felt and went down to lobby. Shaking was definitely there and felt as if hotel was going to tip. | 9 users found this interesting.  
Kenai, Alaska / Weak shaking (MMI III) / horizontal (sideways) swinging / several minutes : I couldn’t tell it was an earthquake at first. It felt like I was swaying side to side in my rocking chair. It made me feel dizzy, like I was rocking on a boat. It was very strange. | 9 users found this interesting.  
Soldotna / Light shaking (MMI IV) / complex motion difficult to describe / 1-2 minutes : Didnt feel motion at all, but got nauseous. Curtains and chandelier were swaying greatly. | 10 users found this interesting.  
Ninilchik / Moderate shaking (MMI V) / both vertical and horizontal swinging / 30-60 s : I was in my car and was swaying front to back and side to side. We had a very windy day so I thought it was the wind. It felt like vertigo. I was on the phone at the time and didn’t say anything to my friend because she hadn’t said | 8 users found this interesting.  
JBER / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Felt like the ground was vibrating and then things started rattling and it felt slightly unstable to walk. | 8 users found this interesting.  
North Bend WA / not felt : Dogs were acting strangely around that time. Very agitated. Barking and acting like someone had just pulled into our driveway but no one was there. Dogs still racing in and out of the house panic | 7 users found this interesting.  
Nikiski, AK / Strong shaking (MMI VI) / complex motion difficult to describe / several minutes : Still feeling shaking after about 15mins | 8 users found this interesting.  
scammon bay / Very weak shaking (MMI II) / 1-2 s : My couch shook at least for like 1-2 seconds. Thought it was the wind but my brother felt his house shake a bit too. | 6 users found this interesting.  
About 4 miles south of Anchorage International Air / Weak shaking (MMI III) / horizontal (sideways) swinging / 20-30 s : The 7'-long Venetian blinds along my front staircase swung enough (in a North-South motion) to hit the window panes twice, about 20 to 25 seconds apart. | 6 users found this interesting.  
Happy valley / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 minutes : Was in basement. Nauseating roll | 7 users found this interesting.  
KOA RV park just outside Homer Alaska / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : The bed was shaking and the TV was | 5 users found this interesting.  
Coopers landing / not felt : I was sitting in my bed and I felt the bed shaking I looked outside and saw the trees shaking and the house shake | 5 users found this interesting.  
Kenai, Cook Inlet View Drive / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : I thought I was feeling dizzy until I looked up and the bug strip hanging from the ceiling was swaying left and right as well. I'm in a 2 story building too. | 5 users found this interesting.  
Kasilof / Weak shaking (MMI III) / horizontal (sideways) swinging / 10-15 s : Rolling rumbling, no jolting | 6 users found this interesting.  
SEWARD / Weak shaking (MMI III) / 20-30 s : I was moving about getting my home picked up for the night when some of my hanging decor started swaying. It continuewhile I moved to a doorway to stand until it ended. | 4 users found this interesting.  
Happy Valley, Alaska / Light shaking (MMI IV) / complex motion difficult to describe / several minutes : In a cabin on shallow pads. First felt vibrating kind of, then long rolling weird motion. Stoo | 4 users found this interesting.  
Bird creek campground AK / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Felt in bird creek campground while camping in our RV i seen the clothes hangers rocking side to side until i got up to check what was going on thought the wind picked up or something. | 4 users found this interesting.  
Homer Alaska / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 minutes : Staying in our Fifth Wheel on the spit. It felt like the wind suddenly got bad, lights and chimes were swaying. Lasted at least 1-2 minutes. | 4 users found this interesting.  
kodiak / Light shaking (MMI IV) / 20-30 s : my bed felt like it was rolling back and forth, and the door on my room was swinging back and forth about 6 inches forward and back | 4 users found this interesting.  
Homer Alaska at home / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 minutes : Sitting in my recliner and it was rocking back and forth for about 60 seconds. Window curtains were swaying as if gentle breeze was blowing them. | 4 users found this interesting.  
Soldotna, AK / Light shaking (MMI IV) / horizontal (sideways) swinging / several minutes : Rolling in several directions, horizontal. Creaking building, curtains moving. It continued for 3-4 minutes. | 4 users found this interesting.  
Soldotna / Light shaking (MMI IV) / several minutes : building was swaying | 5 users found this interesting.  
Anchor Point / not felt : I didn't feel anything, my cats knew and ran, I heard and saw things swaying in my house. | 5 users found this interesting.  
Kodiak Alaska / Light shaking (MMI IV) : Shook for a long time! Make you dizzy….haven’t felt that in a long time… | 5 users found this interesting.  
Anchorage / not felt : Outside walking, no disturbance | 5 users found this interesting.  
Hope, Alaska - Porcupine USFS Campground / Light shaking (MMI IV) / vibration and rolling / 30-60 s : We were in our 5th wheel camped in a site above Turna | 3 users found this interesting.  
Homer, Alaska / Very weak shaking (MMI II) / horizontal (sideways) swinging / 1-2 minutes : I was sitting at Homer Spit and felt side-to-side motion for about a minute. It subsided and then was felt again for 20-30 seconds. | 3 users found this interesting.  
Pasagshak bay / Moderate shaking (MMI V) / complex rolling (tilting in multiple directions) / 20-30 s : Strong Rolling feeling for 30-40 seconds. Was inside at first then went outside and felt it outside as wel. Saw house horizontally moving back and forth. Get dizzy outside on deck. | 3 users found this interesting.  
North Coast of Oregon near Tillamook / not felt : Our dog was acting stressed (whimpering and barking) shortly before the quake and afterwards. | 4 users found this interesting.  
Anchorage point / Moderate shaking (MMI V) / both vertical and horizontal swinging / 15-20 s : Scared | 4 users found this interesting.  
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What is Intensity and the Mercalli Intensity Scale?


The amount of shaking that occurs on the surface due to an earthquake is called the intensity. It is commonly measured on the so-called Modified Mercalli Intensity Scale (MMI) ranging from 1 (not felt) to 10 (extreme shaking), and given in Roman numerals as I,II,...IX, X, and often displayed with color codes ranging from light blue to dark red.
Earthquake intensity depends mainly on the magnitude and depth of the quake as well as the distance from the epicenter: The further away, the less shaking intensity occurs.
Read more about the MMI scale!

Compare Quake Data

Data for the same earthquake as reported by different agencies

The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag Depth Time GMT
2021-07-29
 Epicenter Agency
8.2 32 km
20 mi
 06:15:47 104 Km SE of Perryville, Alaska USGS (United States Geological Survey)
8.2 43 km
27 mi
 06:15:50 ALASKA PENINSULA
26 km (16 mi) epicenter difference with USGS
 EMSC (European-Mediterranean Seismological Centre)
8.2 34 km
21 mi
 06:15:49 Alaska Peninsula
26 km (16 mi) epicenter difference with USGS
 GFZ (German Research Centre for Geosciences)
8.2 40 km
25 mi
 06:15:50 Alaska Peninsula
30 km (19 mi) epicenter difference with USGS
 GeoAu (Geoscience Australia )
7.4 10 km
6.2 mi
(*)		 06:15:47 Near Anchorage
53 km (33 mi) epicenter difference with USGS
 RENASS (Réseau National de Surveillance Sismique (RéNaSS))
7.9 9.8 km
6.1 mi
 06:15:47 Alaska Peninsula, United States [Sea: United States]
28 km (17 mi) epicenter difference with USGS
 INGV (Istituto Nazionale di Geofisica e Vulcanologia)
8.1 27 km
17 mi
 06:15:50 Alaska Peninsula
46 km (29 mi) epicenter difference with USGS
 BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Seismograms

Seismic station: Kodiak Island, Alaska, USA (KDAK/II network) | Distance from quake: 422 km / 262 mi | Show on map | Station Info
Seismic station Kodiak Island, Alaska, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.1-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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1623 aftershocks for this quake so far

For this extremely strong earthquake, 1623 aftershocks have been detected so far. The strongest was a magnitude 6.1 quake that hit 4 minutes after the mainshock in 35 km (22 mi) distance, in 114 Km SSE of Perryville, Alaska, on Wednesday, Jul 28, 2021 on 09:19 pm (- local time GMT -9).
The most recent aftershock occurred 3 years ago 156 km SE of Chignik, Alaska, and had a magnitude of 4.6.

What are aftershocks?


Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.
[More info]

What about this quake?


Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface of approx. 15,849 km2 (=6,119 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 218 km (135 mi).
[More info]


Recorded aftershocks, 200 latest and largest out of 1623 total

Date and Time GMTMag
Depth		DistanceRegionDetails
Apr 18, 2024 11:27 pm (GMT -8)
10 hours ago
3 years after main shock
4.6

16 km		61 km (38 mi)
E of main shock
156 km SE of Chignik, AlaskaMore
Apr 18, 2024 04:20 pm (GMT +0)
1 day 1 hours ago
3 years after main shock
2.3

18 km		77 km (48 mi)
NW of main shock
32 km SSE of Perryville, AlaskaMore
Apr 16, 2024 09:07 pm (GMT +0)
3 days ago
3 years after main shock
2.5

12 km		239 km (148 mi)
NE of main shock
91 km ESE of Ugashik, AlaskaMore
Apr 16, 2024 03:07 am (GMT -9)
3 days ago
3 years after main shock
3.1

35 km		174 km (108 mi)
SW of main shock
135 km SSE of Sand Point, AlaskaMore
Apr 16, 2024 02:51 am (Anchorage)
3 days ago
3 years after main shock
3.0

8.9 km		202 km (126 mi)
N of main shock
43 km SSW of Ugashik, AlaskaMore
Apr 15, 2024 09:42 pm (GMT +0)
4 days ago
3 years after main shock
3.0

0 km		241 km (150 mi)
NE of main shock
88 km ESE of Ugashik, AlaskaMore
Apr 15, 2024 01:32 am (Anchorage)
4 days ago
3 years after main shock
3.6

40 km		166 km (103 mi)
W of main shock
49 km SSE of Sand Point, AlaskaMore
Apr 10, 2024 03:18 pm (GMT -8)
9 days ago
3 years after main shock
2.3

25 km		50 km (31 mi)
W of main shock
66 km SSE of Perryville, AlaskaMore
Apr 9, 2024 05:56 pm (GMT -11)
10 days ago
3 years after main shock
2.9

10 km		260 km (162 mi)
SW of main shock
89 km SE of King Cove, AlaskaMore
Apr 8, 2024 08:54 pm (Anchorage)
11 days ago
3 years after main shock
2.6

84 km		164 km (102 mi)
N of main shock
76 km NE of Chignik, AlaskaMore
Jul 15, 2023 09:48 pm (GMT -9)
40 weeks ago - felt
1 year 50 weeks after main shock
7.2

33 km		210 km (131 mi)
SW of main shock
Alaska PeninsulaMore
Aug 14, 2021 02:57 am (GMT -9)
3 years ago - felt
2 weeks after main shock
6.9

21 km		15 km (9.3 mi)
SE of main shock
119 Km SE of Perryville, AlaskaMore
Oct 11, 2021 01:10 am (Anchorage)
3 years ago - felt
11 weeks after main shock
6.9

69 km		131 km (82 mi)
NE of main shock
114 Km E of Chignik, AlaskaMore
Jul 28, 2021 09:19 pm (GMT -9)
3 years ago
4 minutes after main shock
6.1

27 km		35 km (22 mi)
SW of main shock
114 Km SSE of Perryville, AlaskaMore
Jul 28, 2021 09:23 pm (GMT -9)
3 years ago - felt
8 minutes after main shock
5.9

5.3 km		33 km (21 mi)
E of main shock
119 Km SSE of Chignik, AlaskaMore
Jul 15, 2023 09:51 pm (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
5.7

50 km		201 km (125 mi)
W of main shock
73 Km SSW of Sand Point, AlaskaMore
Sep 16, 2021 08:51 am (GMT -9)
3 years ago
7 weeks after main shock
5.6

37 km		92 km (57 mi)
E of main shock
185 Km SE of Chignik, AlaskaMore
Oct 31, 2021 07:37 am (GMT -9)
2 years ago
13 weeks after main shock
5.6

25 km		72 km (45 mi)
SW of main shock
112 Km SSE of Perryville, AlaskaMore
Aug 3, 2023 10:33 am (GMT -9)
37 weeks ago - felt
2 years after main shock
5.6

42 km		217 km (135 mi)
W of main shock
Near King Cove, Alaska, USAMore
Jul 28, 2021 09:32 pm (GMT -9)
3 years ago - felt
17 minutes after main shock
5.5

10 km		101 km (63 mi)
SE of main shock
South of AlaskaMore
Jul 29, 2021 06:52 pm (GMT -9)
3 years ago
22 hours after main shock
5.5

33 km		55 km (34 mi)
E of main shock
137 Km SE of Chignik, AlaskaMore
Feb 3, 2022 02:53 pm (GMT -9)
2 years ago
27 weeks after main shock
5.4

35 km		270 km (168 mi)
SW of main shock
Alaska PeninsulaMore
Sep 20, 2023 05:13 pm (Anchorage)
30 weeks ago
2 years after main shock
5.4

51 km		166 km (103 mi)
W of main shock
Near King Cove, Alaska, USAMore
Jul 29, 2021 11:32 am (GMT -9)
3 years ago
14 hours after main shock
5.3

10.1 km		70 km (44 mi)
E of main shock
159 Km SE of Chignik, AlaskaMore
Feb 20, 2022 02:47 am (GMT -9)
2 years ago - felt
29 weeks after main shock
5.3

26 km		5.6 km (3.5 mi)
S of main shock
90 Km SE of Perryville, AlaskaMore
Apr 21, 2022 08:27 pm (GMT -9)
1 year 52 weeks ago
38 weeks after main shock
5.3

207 km		261 km (162 mi)
NW of main shock
41 Km NW of Nelson Lagoon, AlaskaMore
Apr 27, 2022 07:33 pm (Anchorage)
1 year 51 weeks ago
39 weeks after main shock
5.2

83 km		143 km (89 mi)
NE of main shock
118 Km E of Chignik, AlaskaMore
Jul 29, 2021 07:09 am (GMT -9)
3 years ago
10 hours after main shock
5.1

1.5 km		67 km (41 mi)
E of main shock
161 Km SE of Chignik, AlaskaMore
Oct 28, 2021 10:06 am (GMT -9)
2 years ago
13 weeks after main shock
5.1

32 km		70 km (44 mi)
W of main shock
93 Km S of Perryville, AlaskaMore
Jun 2, 2022 12:41 pm (GMT -9)
1 year 46 weeks ago
44 weeks after main shock
5.1

83 km		56 km (35 mi)
E of main shock
137 Km SE of Chignik, AlaskaMore
Aug 30, 2023 10:59 am (Anchorage)
33 weeks ago - felt
2 years after main shock
5.1

51 km		227 km (141 mi)
W of main shock
63 Km ESE of King Cove, AlaskaMore
Jul 29, 2021 12:55 am (GMT -9)
3 years ago
4 hours after main shock
5.0

10 km		138 km (86 mi)
E of main shock
South of AlaskaMore
Sep 16, 2021 02:05 pm (GMT -9)
3 years ago
7 weeks after main shock
5.0

41 km		110 km (68 mi)
SE of main shock
204 Km SE of Chignik, AlaskaMore
Aug 16, 2022 06:00 pm (Anchorage)
1 year 35 weeks ago
1 year 3 weeks after main shock
5.0

33 km		143 km (89 mi)
NE of main shock
153 Km SW of Akhiok, AlaskaMore
Jan 10, 2023 10:42 am (GMT -9)
1 year 14 weeks ago
1 year 24 weeks after main shock
5.0

25 km		97 km (60 mi)
SE of main shock
201 Km SE of Perryville, AlaskaMore
Sep 22, 2023 01:04 am (Anchorage)
30 weeks ago
2 years after main shock
5.0

44 km		172 km (107 mi)
W of main shock
39 Km S of Sand Point, AlaskaMore
Sep 20, 2022 12:37 am (Anchorage)
1 year 30 weeks ago
1 year 8 weeks after main shock
4.9

36 km		127 km (79 mi)
NE of main shock
Alaska PeninsulaMore
Oct 26, 2022 01:30 am (Anchorage)
1 year 25 weeks ago - felt
1 year 13 weeks after main shock
4.9

42 km		160 km (100 mi)
W of main shock
56 Km SSE of Sand Point, AlaskaMore
Dec 20, 2022 11:50 pm (GMT -9)
1 year 17 weeks ago
1 year 21 weeks after main shock
4.9

12 km		253 km (157 mi)
SW of main shock
153 Km SE of King Cove, AlaskaMore
Feb 24, 2023 02:50 am (GMT -9)
1 year 8 weeks ago
1 year 30 weeks after main shock
4.9

45 km		254 km (158 mi)
SW of main shock
94 Km SE of King Cove, AlaskaMore
Sep 10, 2023 04:03 am (GMT -9)
32 weeks ago
2 years after main shock
4.9

10 km		228 km (142 mi)
SW of main shock
115 Km SSW of Sand Point, AlaskaMore
Jul 28, 2021 09:47 pm (GMT -9)
3 years ago
32 minutes after main shock
4.8

58 km		29 km (18 mi)
S of main shock
129 Km SE of Perryville, AlaskaMore
Jul 29, 2021 11:30 am (GMT -9)
3 years ago
14 hours after main shock
4.8

3.4 km		64 km (40 mi)
E of main shock
South of AlaskaMore
Jun 9, 2022 09:44 am (GMT -9)
1 year 45 weeks ago
45 weeks after main shock
4.8

26 km		141 km (87 mi)
SW of main shock
110 Km SSE of Sand Point, AlaskaMore
Oct 10, 2022 03:24 pm (Anchorage)
1 year 27 weeks ago
1 year 11 weeks after main shock
4.8

35 km		130 km (81 mi)
SW of main shock
South of AlaskaMore
Apr 24, 2023 04:09 am (GMT -9)
52 weeks ago
1 year 38 weeks after main shock
4.8

5.7 km		73 km (45 mi)
S of main shock
164 Km SSE of Perryville, AlaskaMore
Jul 29, 2021 12:28 am (GMT -9)
3 years ago
3 hours after main shock
4.7

26 km		25 km (16 mi)
E of main shock
126 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 01:18 pm (GMT -9)
3 years ago
16 hours after main shock
4.7

10 km		53 km (33 mi)
E of main shock
Alaska PeninsulaMore
Jul 30, 2021 01:11 pm (GMT -9)
3 years ago
1 day 16 hours after main shock
4.7

55 km		226 km (140 mi)
E of main shock
153 Km S of Akhiok, AlaskaMore
Oct 1, 2021 05:12 am (GMT -9)
3 years ago
9 weeks after main shock
4.7

45 km		115 km (72 mi)
NE of main shock
136 Km ESE of Chignik, AlaskaMore
Dec 12, 2021 12:55 am (GMT -9)
2 years ago
19 weeks after main shock
4.7

6.1 km		24 km (15 mi)
NE of main shock
110 Km SSE of Chignik, AlaskaMore
Feb 10, 2022 04:05 pm (GMT -9)
2 years ago
28 weeks after main shock
4.7

38 km		6.7 km (4.2 mi)
S of main shock
108 Km SE of Perryville, AlaskaMore
Jun 15, 2023 10:04 pm (GMT -9)
44 weeks ago
1 year 46 weeks after main shock
4.7

9.8 km		70 km (44 mi)
E of main shock
150 Km SE of Chignik, AlaskaMore
Jul 16, 2023 02:22 am (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
4.7

39 km		219 km (136 mi)
W of main shock
91 Km SSW of Sand Point, AlaskaMore
Jul 26, 2023 06:29 am (GMT -9)
38 weeks ago
1 year 52 weeks after main shock
4.7

40 km		214 km (133 mi)
W of main shock
82 Km SSW of Sand Point, AlaskaMore
Sep 26, 2023 06:14 pm (Anchorage)
29 weeks ago
2 years after main shock
4.7

52 km		166 km (103 mi)
W of main shock
Alaska PeninsulaMore
Jul 28, 2021 11:09 pm (GMT -9)
3 years ago
1 hour and 54 minutes after main shock
4.6

35 km		55 km (34 mi)
SE of main shock
135 Km SE of Chignik, AlaskaMore
Jul 29, 2021 12:00 pm (GMT -9)
3 years ago
15 hours after main shock
4.6

25 km		42 km (26 mi)
S of main shock
124 Km SSE of Perryville, AlaskaMore
Sep 1, 2021 11:08 pm (GMT -9)
3 years ago
5 weeks after main shock
4.6

26 km		146 km (91 mi)
SW of main shock
106 Km SSE of Sand Point, AlaskaMore
Dec 25, 2021 02:10 pm (GMT -9)
2 years ago
21 weeks after main shock
4.6

14 km		50 km (31 mi)
S of main shock
134 Km SSE of Perryville, AlaskaMore
Apr 10, 2022 01:29 pm (GMT -9)
2 years ago
37 weeks after main shock
4.6

51 km		171 km (106 mi)
NE of main shock
112 Km SSE of Ugashik, AlaskaMore
Oct 9, 2022 05:50 pm (Anchorage)
1 year 28 weeks ago
1 year 10 weeks after main shock
4.6

31 km		146 km (90 mi)
SW of main shock
Alaska PeninsulaMore
Dec 30, 2022 09:13 pm (Anchorage)
1 year 16 weeks ago
1 year 22 weeks after main shock
4.6

39 km		162 km (100 mi)
W of main shock
Alaska PeninsulaMore
Jul 15, 2023 10:51 pm (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
4.6

38 km		220 km (137 mi)
SW of main shock
116 Km S of Sand Point, AlaskaMore
Aug 28, 2023 01:01 pm (GMT -9)
34 weeks ago
2 years after main shock
4.6

57 km		223 km (138 mi)
W of main shock
74 Km SW of Sand Point, AlaskaMore
Jul 28, 2021 10:32 pm (GMT -9)
3 years ago
1 hour and 17 minutes after main shock
4.5

16 km		51 km (32 mi)
SE of main shock
154 Km SE of Perryville, AlaskaMore
Jul 28, 2021 09:45 pm (GMT -9)
3 years ago
29 minutes after main shock
4.5

25 km		42 km (26 mi)
SE of main shock
144 Km SE of Perryville, AlaskaMore
Jul 29, 2021 12:53 am (GMT -9)
3 years ago
4 hours after main shock
4.5

25 km		59 km (37 mi)
E of main shock
149 Km SE of Chignik, AlaskaMore
Jul 31, 2021 07:40 am (Anchorage)
3 years ago
2 days after main shock
4.5

37 km		124 km (77 mi)
NE of main shock
122 Km SW of Akhiok, AlaskaMore
Aug 24, 2021 04:31 pm (GMT -9)
3 years ago - felt
4 weeks after main shock
4.5

9.5 km		43 km (27 mi)
W of main shock
66 Km SE of Perryville, AlaskaMore
Feb 13, 2022 01:25 pm (GMT -9)
2 years ago
29 weeks after main shock
4.5

10 km		75 km (46 mi)
SE of main shock
144 mi E of Sand Point, Aleutians East, Alaska, United StatesMore
Apr 13, 2022 06:23 am (Anchorage)
2 years ago
37 weeks after main shock
4.5

31 km		145 km (90 mi)
SW of main shock
78 Km SSE of Sand Point, AlaskaMore
Oct 11, 2022 11:34 pm (GMT -9)
1 year 27 weeks ago
1 year 11 weeks after main shock
4.5

6.6 km		250 km (155 mi)
NE of main shock
81 Km S of Akhiok, AlaskaMore
Mar 7, 2023 04:12 am (Anchorage)
1 year 6 weeks ago
1 year 32 weeks after main shock
4.5

35 km		140 km (87 mi)
SW of main shock
95 Km SE of Sand Point, AlaskaMore
Jun 6, 2023 03:56 pm (GMT -9)
45 weeks ago
1 year 45 weeks after main shock
4.5

2.7 km		222 km (138 mi)
NE of main shock
Alaska PeninsulaMore
Jul 24, 2023 03:04 am (GMT -9)
39 weeks ago
1 year 51 weeks after main shock
4.5

43 km		186 km (116 mi)
W of main shock
56 Km S of Sand Point, AlaskaMore
Jul 28, 2023 02:32 am (GMT -9)
38 weeks ago
1 year 52 weeks after main shock
4.5

38 km		173 km (108 mi)
NE of main shock
Alaska PeninsulaMore
Aug 20, 2023 11:56 am (GMT -9)
35 weeks ago
2 years after main shock
4.5

50 km		221 km (137 mi)
W of main shock
81 Km SSW of Sand Point, AlaskaMore
Nov 11, 2023 07:51 am (Anchorage)
23 weeks ago
2 years after main shock
4.5

32 km		138 km (86 mi)
SW of main shock
94 Km SE of Sand Point, AlaskaMore
Jul 28, 2021 10:11 pm (GMT -9)
3 years ago
56 minutes after main shock
4.4

16 km		51 km (32 mi)
SW of main shock
96 Km SSE of Perryville, AlaskaMore
Jul 29, 2021 12:52 am (GMT -9)
3 years ago
4 hours after main shock
4.4

17 km		96 km (60 mi)
E of main shock
163 Km SE of Chignik, AlaskaMore
Jul 29, 2021 05:17 am (Anchorage)
3 years ago
7 hours after main shock
4.4

42 km		125 km (77 mi)
E of main shock
163 Km ESE of Chignik, AlaskaMore
Nov 15, 2021 12:19 am (Anchorage)
2 years ago
16 weeks after main shock
4.4

10.4 km		156 km (97 mi)
NE of main shock
149 Km SSW of Akhiok, AlaskaMore
Feb 13, 2022 01:31 pm (GMT -9)
2 years ago
29 weeks after main shock
4.4

10 km		72 km (45 mi)
SE of main shock
176 Km SE of Perryville, AlaskaMore
Feb 25, 2023 09:12 am (GMT -9)
1 year 8 weeks ago
1 year 30 weeks after main shock
4.4

36 km		153 km (95 mi)
SW of main shock
70 mi SE of Sand Point, Aleutians East, Alaska, United StatesMore
Jul 15, 2023 10:03 pm (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
4.4

40 km		225 km (140 mi)
SW of main shock
116 Km SSW of Sand Point, AlaskaMore
Jul 18, 2023 02:06 am (GMT -9)
39 weeks ago
1 year 51 weeks after main shock
4.4

35 km		201 km (125 mi)
W of main shock
Alaska PeninsulaMore
Sep 19, 2023 07:52 am (GMT -9)
30 weeks ago
2 years after main shock
4.4

35 km		222 km (138 mi)
SW of main shock
110 Km SSW of Sand Point, AlaskaMore
Jan 14, 2024 11:16 pm (GMT -9)
14 weeks ago
2 years after main shock
4.4

58 km		52 km (33 mi)
NW of main shock
61 Km SSE of Chignik, AlaskaMore
Mar 1, 2024 09:02 pm (GMT -11)
7 weeks ago
3 years after main shock
4.4

4.6 km		259 km (161 mi)
SW of main shock
94 Km SSE of King Cove, AlaskaMore
Mar 2, 2024 08:17 am (GMT -11)
7 weeks ago
3 years after main shock
4.4

50 km		270 km (168 mi)
W of main shock
79 Km SSE of King Cove, AlaskaMore
Jul 28, 2021 10:22 pm (GMT -9)
3 years ago
1 hour and 6 minutes after main shock
4.3

36 km		41 km (26 mi)
E of main shock
129 Km SE of Chignik, AlaskaMore
Jul 28, 2021 10:50 pm (GMT -9)
3 years ago
1 hour and 34 minutes after main shock
4.3

26 km		31 km (19 mi)
E of main shock
132 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 03:42 am (GMT -9)
3 years ago
6 hours after main shock
4.3

25 km		41 km (26 mi)
E of main shock
133 Km SE of Chignik, AlaskaMore
Jul 29, 2021 12:39 pm (GMT -9)
3 years ago
15 hours after main shock
4.3

14 km		58 km (36 mi)
SE of main shock
158 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 08:32 pm (GMT -9)
3 years ago
23 hours after main shock
4.3

20 km		63 km (39 mi)
SW of main shock
95 Km SSE of Perryville, AlaskaMore
Jul 29, 2021 10:24 pm (GMT -9)
3 years ago
1 day 1 hours after main shock
4.3

15 km		103 km (64 mi)
E of main shock
193 Km SE of Chignik, AlaskaMore
Aug 1, 2021 06:27 am (GMT -9)
3 years ago - felt
3 days after main shock
4.3

11 km		40 km (25 mi)
W of main shock
76 Km SSE of Perryville, AlaskaMore
Aug 5, 2021 09:00 am (GMT -9)
3 years ago
7 days after main shock
4.3

7.1 km		53 km (33 mi)
SE of main shock
155 Km SSE of Chignik, AlaskaMore
Sep 19, 2021 04:17 am (GMT -9)
3 years ago
7 weeks after main shock
4.3

19 km		75 km (47 mi)
SW of main shock
127 Km SSE of Perryville, AlaskaMore
Oct 17, 2021 10:27 am (GMT -9)
3 years ago
12 weeks after main shock
4.3

25 km		36 km (22 mi)
SE of main shock
138 Km SE of Perryville, AlaskaMore
Dec 13, 2021 03:02 pm (GMT -9)
2 years ago
20 weeks after main shock
4.3

10 km		52 km (32 mi)
S of main shock
140 Km SSE of Perryville, AlaskaMore
Dec 25, 2021 01:15 am (GMT -9)
2 years ago
21 weeks after main shock
4.3

44 km		81 km (50 mi)
E of main shock
177 Km SE of Chignik, AlaskaMore
Feb 17, 2022 12:45 am (GMT -9)
2 years ago
29 weeks after main shock
4.3

20 km		152 km (94 mi)
SW of main shock
108 Km SSE of Sand Point, AlaskaMore
Jul 28, 2021 09:53 pm (GMT -9)
3 years ago
38 minutes after main shock
4.2

25 km		71 km (44 mi)
E of main shock
South of AlaskaMore
Jul 28, 2021 09:57 pm (GMT -9)
3 years ago
41 minutes after main shock
4.2

24 km		59 km (36 mi)
E of main shock
Alaska PeninsulaMore
Jul 28, 2021 11:15 pm (GMT -9)
3 years ago
2 hours and 0 minutes after main shock
4.2

33 km		65 km (41 mi)
E of main shock
149 Km SE of Chignik, AlaskaMore
Jul 28, 2021 11:25 pm (GMT -9)
3 years ago
2 hours and 10 minutes after main shock
4.2

48 km		115 km (71 mi)
E of main shock
173 Km ESE of Chignik, AlaskaMore
Jul 29, 2021 12:58 am (GMT -9)
3 years ago
4 hours after main shock
4.2

16 km		131 km (82 mi)
E of main shock
203 Km SE of Chignik, AlaskaMore
Jul 29, 2021 02:08 am (GMT -9)
3 years ago
5 hours after main shock
4.2

25 km		29 km (18 mi)
E of main shock
130 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 12:17 pm (GMT -9)
3 years ago
15 hours after main shock
4.2

7.8 km		138 km (86 mi)
E of main shock
196 Km SSW of Akhiok, AlaskaMore
Oct 20, 2021 11:24 pm (GMT -9)
2 years ago
12 weeks after main shock
4.2

11 km		153 km (95 mi)
E of main shock
195 Km SSW of Akhiok, AlaskaMore
Nov 17, 2021 06:20 pm (Anchorage)
2 years ago
16 weeks after main shock
4.2

29 km		133 km (83 mi)
SW of main shock
84 Km SE of Sand Point, AlaskaMore
Apr 25, 2022 07:31 am (GMT -9)
1 year 51 weeks ago
39 weeks after main shock
4.2

26 km		148 km (92 mi)
SE of main shock
South of AlaskaMore
Aug 30, 2022 09:18 am (GMT -9)
1 year 33 weeks ago
1 year 5 weeks after main shock
4.2

6.1 km		149 km (92 mi)
E of main shock
225 Km SE of Chignik, AlaskaMore
Sep 29, 2022 11:10 am (Anchorage)
1 year 29 weeks ago
1 year 9 weeks after main shock
4.2

31 km		113 km (70 mi)
W of main shock
67 Km ESE of Sand Point, AlaskaMore
Jul 16, 2023 02:44 am (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
4.2

35 km		222 km (138 mi)
SW of main shock
116 Km S of Sand Point, AlaskaMore
Sep 11, 2023 08:23 pm (GMT -9)
32 weeks ago
2 years after main shock
4.2

12 km		111 km (69 mi)
SE of main shock
205 Km SE of Chignik, AlaskaMore
Dec 24, 2023 01:04 pm (GMT -9)
17 weeks ago
2 years after main shock
4.2

16 km		98 km (61 mi)
SE of main shock
202 Km SE of Perryville, AlaskaMore
Jul 28, 2021 11:40 pm (GMT -9)
3 years ago
2 hours and 25 minutes after main shock
4.1

26 km		44 km (28 mi)
SE of main shock
140 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 10:11 am (GMT -9)
3 years ago
13 hours after main shock
4.1

10 km		72 km (45 mi)
E of main shock
140 Km SE of Chignik, AlaskaMore
Jul 29, 2021 04:26 pm (GMT -9)
3 years ago
19 hours after main shock
4.1

33 km		131 km (81 mi)
E of main shock
185 Km ESE of Chignik, AlaskaMore
Jul 31, 2021 11:58 pm (GMT -9)
3 years ago
3 days after main shock
4.1

41 km		186 km (116 mi)
E of main shock
217 Km SSW of Akhiok, AlaskaMore
Aug 8, 2021 11:30 pm (GMT -9)
3 years ago
11 days after main shock
4.1

10 km		150 km (93 mi)
E of main shock
200 Km SSW of Akhiok, AlaskaMore
Aug 10, 2021 11:15 pm (GMT -9)
3 years ago
13 days after main shock
4.1

31 km		100 km (62 mi)
SE of main shock
204 Km SE of Perryville, AlaskaMore
Aug 16, 2021 07:24 am (GMT -9)
3 years ago
3 weeks after main shock
4.1

28 km		17 km (10.6 mi)
SE of main shock
82 Km SE of Perryville, AlaskaMore
Oct 11, 2021 11:40 am (Anchorage)
3 years ago
11 weeks after main shock
4.1

57 km		134 km (83 mi)
NE of main shock
115 Km E of Chignik, AlaskaMore
Dec 5, 2021 11:15 pm (GMT -9)
2 years ago
19 weeks after main shock
4.1

10 km		64 km (40 mi)
S of main shock
154 Km SSE of Perryville, AlaskaMore
Apr 29, 2022 03:49 pm (Anchorage)
1 year 51 weeks ago
39 weeks after main shock
4.1

28 km		135 km (84 mi)
SW of main shock
87 Km SE of Sand Point, AlaskaMore
Jun 3, 2022 06:19 pm (Anchorage)
1 year 46 weeks ago
44 weeks after main shock
4.1

43 km		123 km (76 mi)
SW of main shock
79 Km SE of Sand Point, AlaskaMore
Aug 29, 2022 01:32 pm (Anchorage)
1 year 33 weeks ago
1 year 5 weeks after main shock
4.1

4.7 km		99 km (61 mi)
W of main shock
58 Km S of Ivanof Bay, AlaskaMore
Dec 22, 2022 07:25 am (GMT -9)
1 year 17 weeks ago
1 year 21 weeks after main shock
4.1

36 km		139 km (86 mi)
SW of main shock
South of AlaskaMore
Jul 22, 2023 04:14 pm (GMT -9)
39 weeks ago
1 year 51 weeks after main shock
4.1

23 km		99 km (62 mi)
E of main shock
South of AlaskaMore
Aug 27, 2023 12:56 pm (GMT -9)
34 weeks ago
2 years after main shock
4.1

50 km		224 km (139 mi)
W of main shock
Alaska PeninsulaMore
Jul 28, 2021 11:32 pm (GMT -9)
3 years ago
2 hours and 17 minutes after main shock
4.0

0.2 km		99 km (61 mi)
E of main shock
176 Km SE of Chignik, AlaskaMore
Jul 29, 2021 01:26 am (GMT -9)
3 years ago
4 hours after main shock
4.0

0 km		87 km (54 mi)
SE of main shock
191 Km SE of Perryville, AlaskaMore
Jul 29, 2021 08:27 am (GMT -9)
3 years ago
11 hours after main shock
4.0

1.5 km		76 km (47 mi)
NE of main shock
127 Km SE of Chignik, AlaskaMore
Jul 29, 2021 10:49 pm (GMT -9)
3 years ago
1 day 2 hours after main shock
4.0

28 km		36 km (22 mi)
E of main shock
128 Km SSE of Chignik, AlaskaMore
Jul 30, 2021 12:58 am (GMT -9)
3 years ago
1 day 4 hours after main shock
4.0

35 km		42 km (26 mi)
SE of main shock
146 Km SE of Perryville, AlaskaMore
Jul 30, 2021 06:25 pm (GMT -9)
3 years ago
1 day 21 hours after main shock
4.0

30 km		34 km (21 mi)
E of main shock
136 Km SSE of Chignik, AlaskaMore
Jul 31, 2021 10:04 am (Anchorage)
3 years ago
2 days after main shock
4.0

42 km		127 km (79 mi)
NE of main shock
131 Km ESE of Chignik, AlaskaMore
Aug 10, 2021 08:43 pm (GMT -9)
3 years ago
13 days after main shock
4.0

16 km		113 km (70 mi)
SE of main shock
217 Km SE of Perryville, AlaskaMore
Aug 12, 2021 12:54 am (GMT -9)
3 years ago
2 weeks after main shock
4.0

28 km		33 km (21 mi)
E of main shock
136 Km SSE of Chignik, AlaskaMore
Aug 14, 2021 04:06 am (GMT -9)
3 years ago
2 weeks after main shock
4.0

20 km		44 km (28 mi)
SE of main shock
146 Km SE of Perryville, AlaskaMore
Oct 14, 2021 05:50 pm (GMT -9)
3 years ago
11 weeks after main shock
4.0

38 km		44 km (27 mi)
E of main shock
144 Km SSE of Chignik, AlaskaMore
Dec 6, 2021 01:20 pm (Anchorage)
2 years ago
19 weeks after main shock
4.0

33 km		127 km (79 mi)
E of main shock
165 Km ESE of Chignik, AlaskaMore
Dec 13, 2021 04:22 pm (GMT -9)
2 years ago
20 weeks after main shock
4.0

4.3 km		53 km (33 mi)
S of main shock
140 Km SSE of Perryville, AlaskaMore
Apr 29, 2022 02:25 am (GMT -9)
1 year 51 weeks ago
39 weeks after main shock
4.0

24 km		110 km (68 mi)
SE of main shock
214 Km SE of Perryville, AlaskaMore
Jun 30, 2022 08:22 am (Anchorage)
1 year 42 weeks ago
48 weeks after main shock
4.0

27 km		239 km (148 mi)
W of main shock
74 Km SE of King Cove, AlaskaMore
Jul 19, 2022 09:40 am (Anchorage)
1 year 39 weeks ago
51 weeks after main shock
4.0

27 km		122 km (76 mi)
SW of main shock
81 Km SE of Sand Point, AlaskaMore
Sep 12, 2022 10:46 am (Anchorage)
1 year 31 weeks ago
1 year 7 weeks after main shock
4.0

46 km		132 km (82 mi)
NE of main shock
113 Km E of Chignik, AlaskaMore
Jul 16, 2023 03:05 am (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
4.0

35 km		210 km (131 mi)
SW of main shock
114 Km S of Sand Point, AlaskaMore
Jul 18, 2023 12:11 pm (GMT -9)
39 weeks ago
1 year 51 weeks after main shock
4.0

9.9 km		93 km (58 mi)
SE of main shock
197 Km SE of Perryville, AlaskaMore
Aug 15, 2023 09:09 am (GMT -9)
35 weeks ago
2 years after main shock
4.0

45 km		220 km (137 mi)
W of main shock
77 Km SSW of Sand Point, AlaskaMore
Sep 22, 2023 03:59 am (Anchorage)
30 weeks ago
2 years after main shock
4.0

46 km		166 km (103 mi)
W of main shock
41 Km S of Sand Point, AlaskaMore
Oct 6, 2023 05:49 pm (GMT -9)
28 weeks ago
2 years after main shock
4.0

44 km		254 km (158 mi)
SW of main shock
92 Km SE of King Cove, AlaskaMore
Dec 10, 2023 02:19 pm (GMT -9)
19 weeks ago
2 years after main shock
4.0

42 km		218 km (135 mi)
W of main shock
84 Km SSW of Sand Point, AlaskaMore
Jan 10, 2024 02:04 am (GMT -9)
14 weeks ago - felt
2 years after main shock
4.0

38 km		272 km (169 mi)
W of main shock
77 Km SSE of King Cove, AlaskaMore
Jul 28, 2021 11:55 pm (GMT -9)
3 years ago
2 hours and 40 minutes after main shock
3.9

36 km		33 km (20 mi)
SE of main shock
136 Km SE of Perryville, AlaskaMore
Jul 28, 2021 10:58 pm (GMT -9)
3 years ago
1 hour and 43 minutes after main shock
3.9

32 km		33 km (20 mi)
SE of main shock
135 Km SE of Perryville, AlaskaMore
Jul 28, 2021 11:15 pm (GMT -9)
3 years ago
1 hour and 60 minutes after main shock
3.9

0.7 km		50 km (31 mi)
NE of main shock
113 Km SE of Chignik, AlaskaMore
Jul 29, 2021 04:14 am (GMT -9)
3 years ago
7 hours after main shock
3.9

36 km		43 km (27 mi)
S of main shock
140 Km SE of Perryville, AlaskaMore
Jul 29, 2021 01:56 pm (GMT -9)
3 years ago
17 hours after main shock
3.9

7.3 km		89 km (55 mi)
E of main shock
161 Km SE of Chignik, AlaskaMore
Jul 29, 2021 02:38 pm (GMT -9)
3 years ago
17 hours after main shock
3.9

21 km		52 km (32 mi)
SE of main shock
153 Km SSE of Chignik, AlaskaMore
Jul 29, 2021 10:55 pm (GMT -9)
3 years ago
1 day 2 hours after main shock
3.9

16 km		163 km (101 mi)
S of main shock
252 Km SSE of Perryville, AlaskaMore
Aug 8, 2021 11:41 am (GMT -9)
3 years ago
11 days after main shock
3.9

4.4 km		97 km (60 mi)
E of main shock
South of AlaskaMore
Aug 14, 2021 09:44 am (GMT -9)
3 years ago
2 weeks after main shock
3.9

30 km		25 km (15 mi)
SE of main shock
129 Km SE of Perryville, AlaskaMore
Aug 18, 2021 06:22 pm (Anchorage)
3 years ago
3 weeks after main shock
3.9

12 km		152 km (94 mi)
N of main shock
85 Km S of Ugashik, AlaskaMore
Aug 31, 2021 01:15 pm (GMT -9)
3 years ago
5 weeks after main shock
3.9

0 km		89 km (55 mi)
SE of main shock
193 Km SE of Perryville, AlaskaMore
Sep 2, 2021 04:37 am (GMT -9)
3 years ago
5 weeks after main shock
3.9

10 km		29 km (18 mi)
S of main shock
129 Km SE of Perryville, AlaskaMore
Sep 3, 2021 11:38 am (GMT -9)
3 years ago
5 weeks after main shock
3.9

40 km		41 km (26 mi)
S of main shock
139 Km SE of Perryville, AlaskaMore
Sep 15, 2021 01:48 am (GMT -9)
3 years ago
7 weeks after main shock
3.9

33 km		106 km (66 mi)
E of main shock
198 Km SE of Chignik, AlaskaMore
Nov 4, 2021 10:17 am (GMT -9)
2 years ago
14 weeks after main shock
3.9

0 km		91 km (57 mi)
SE of main shock
195 Km SE of Perryville, AlaskaMore
Dec 25, 2021 02:10 pm (GMT -9)
2 years ago
21 weeks after main shock
3.9

20 km		71 km (44 mi)
S of main shock
161 Km SSE of Perryville, AlaskaMore
Jan 5, 2022 05:23 am (GMT -9)
2 years ago
23 weeks after main shock
3.9

10.2 km		235 km (146 mi)
NE of main shock
95 Km S of Akhiok, AlaskaMore
Feb 7, 2022 07:58 pm (GMT -9)
2 years ago
28 weeks after main shock
3.9

10 km		103 km (64 mi)
E of main shock
196 Km SE of Chignik, AlaskaMore
Mar 17, 2022 12:10 pm (GMT -9)
2 years ago
33 weeks after main shock
3.9

10 km		187 km (116 mi)
SW of main shock
160 Km SSE of Sand Point, AlaskaMore
Jun 7, 2022 02:10 pm (GMT -9)
1 year 45 weeks ago
45 weeks after main shock
3.9

7.6 km		75 km (46 mi)
E of main shock
162 Km SE of Chignik, AlaskaMore
Aug 5, 2022 10:30 pm (GMT -9)
1 year 37 weeks ago
1 year 1 weeks after main shock
3.9

41 km		229 km (142 mi)
SW of main shock
121 Km SSW of Sand Point, AlaskaMore
Aug 30, 2022 09:23 am (GMT -9)
1 year 33 weeks ago
1 year 5 weeks after main shock
3.9

42 km		145 km (90 mi)
E of main shock
222 Km SE of Chignik, AlaskaMore
Oct 10, 2022 10:25 pm (GMT -9)
1 year 27 weeks ago
1 year 11 weeks after main shock
3.9

0.6 km		45 km (28 mi)
NE of main shock
118 Km SE of Chignik, AlaskaMore
Nov 11, 2022 08:40 pm (GMT -9)
1 year 23 weeks ago
1 year 15 weeks after main shock
3.9

10 km		261 km (162 mi)
E of main shock
271 Km S of Akhiok, AlaskaMore
Apr 22, 2023 12:23 pm (GMT -9)
52 weeks ago
1 year 38 weeks after main shock
3.9

18 km		53 km (33 mi)
E of main shock
136 Km SE of Chignik, AlaskaMore
Apr 22, 2023 08:10 pm (GMT -9)
52 weeks ago
1 year 38 weeks after main shock
3.9

10 km		106 km (66 mi)
SE of main shock
South of AlaskaMore
Jul 16, 2023 04:12 am (GMT -9)
40 weeks ago
1 year 50 weeks after main shock
3.9

40 km		217 km (135 mi)
W of main shock
81 Km SSW of Sand Point, AlaskaMore
Jul 21, 2023 09:32 pm (GMT -9)
39 weeks ago
1 year 51 weeks after main shock
3.9

42 km		212 km (132 mi)
W of main shock
82 Km SSW of Sand Point, AlaskaMore
Jul 28, 2023 05:27 am (GMT -9)
38 weeks ago
1 year 52 weeks after main shock
3.9

42 km		226 km (140 mi)
SW of main shock
121 Km S of Sand Point, AlaskaMore
Oct 6, 2023 02:33 am (GMT -9)
28 weeks ago
2 years after main shock
3.9

12 km		261 km (162 mi)
E of main shock
126 Km S of Akhiok, AlaskaMore
Nov 14, 2023 04:08 am (GMT -11)
22 weeks ago
2 years after main shock
3.9

35 km		158 km (98 mi)
SW of main shock
114 Km SSE of Sand Point, AlaskaMore
Jul 28, 2021 11:08 pm (GMT -9)
3 years ago
1 hour and 53 minutes after main shock
3.9

40 km		50 km (31 mi)
E of main shock
Alaska PeninsulaMore
Jul 28, 2021 09:15 pm (GMT -9)
3 years ago - felt
8.2

32 km		0 km - This quake104 mi E of Sand Point, Aleutians East, Alaska, United States
Main Shock (this quake)
More
Show all

Map of aftershocks

Earthquake statistics

Average number of earthquakes

Based on data from the past 14 years and our earthquake archive back to 1900, there are about 104 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 8 or higher: 0.02 quakes per year (or 1 quake every 62.5 years)
  • Mag. 7 or higher: 0.04 quakes per year (or 1 quake every 25 years)
  • Mag. 6 or higher: 0.14 quakes per year (or 1 quake every 7.3 years)
  • Mag. 5 or higher: 1.82 quakes per year
  • Mag. 4 or higher: 15.2 quakes per year
  • Mag. 3 or higher: 68 quakes per year (or 5.7 quakes per month)
  • Mag. 2 or higher: 98 quakes per year (or 8.2 quakes per month)
  • Mag. 1 or higher: 101 quakes per year (or 8.4 quakes per month)
The area where this quake occurred has a very high level of seismic activity. It has had at least 2 quakes above magnitude 8 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 60 to 65 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

Strongest in 83 years

The earthquake was the strongest to hit this part of the  United States in over 83 years. Earlier, the last quake of equal or greater strength near the present epicenter had been a magnitude 8.2 earthquake on Thursday, Nov 10, 1938, at 08:18 pm local time (Universal Time GMT +0) in 27 km (17 mi) distance to the southwest:
Mag. 8.2 earthquake Alaska Peninsula - Nov 10, 1938 -
Below is a list and map of (larger or recent) quakes that had occurred near the area of the epicenter before this earthquake (within up to 100 km/61 mi distance, up to 300 km/183 mi for very large quakes above mag. 7). Filter the list to limit the number to show, by magnitude or time before.
Date and TimeMag
Depth		DistanceLocationDetailsMap
Jan 11, 2021 12:17 pm (GMT -9)
4.2

14 km		13 km (8 mi) to the S 111 Km SE of Perryville, Alaska, USA 1 report
Info
Nov 1, 2020 01:41 pm (GMT -9)
4.2

4.8 km		27 km (17 mi) to the NW 48 miles SE of Perryville, Alaska
Info
Oct 19, 2020 12:54 pm (Anchorage)
7.6

35 km		139 km (86 mi) to the SW 97 Km SE of Sand Point, Alaska, USA 33 reportsInfo
Sep 27, 2020 09:32 pm (GMT -9)
3.7

11 km		33 km (20 mi) to the NW 72 km SE of Perryville, Alaska 1 report
Info
Sep 24, 2020 08:57 pm (GMT -9)
4.9

27 km		33 km (20 mi) to the S Alaska Peninsula, USA 2 reportsInfo
Aug 22, 2020 05:01 pm (GMT -9)
4.0

41 km		38 km (24 mi) to the S Gulf of Alaska, 103 mi east of Sand Point, Alaska, USA
Info
Aug 18, 2020 09:28 am (GMT -9)
5.3

5 km		19 km (12 mi) to the SW Alaska Peninsula (USA) Info
Aug 8, 2020 03:52 am (GMT -9)
5.3

25 km		64 km (40 mi) to the SW 135 km SSE of Perryville, Alaska (USA) 1 reportInfo
Jul 22, 2020 01:39 pm (Anchorage)
5.5

36 km		96 km (59 mi) to the W Alaska Peninsula (USA) 2 reportsInfo
Jul 22, 2020 12:13 am (Anchorage)
5.8

37 km		98 km (61 mi) to the W 72 km E of Sand Point, Alaska (USA) 1 reportInfo
Jul 21, 2020 09:20 pm (GMT -9)
5.7

26 km		96 km (60 mi) to the SW 123 km SE of Sand Point, Alaska (USA) 1 reportInfo
Jul 21, 2020 10:16 pm (Anchorage)
6.1

18 km		88 km (55 mi) to the SW 103 km ESE of Sand Point, Alaska (USA) Info
Jul 21, 2020 09:12 pm (GMT -9)
7.8

28 km		54 km (34 mi) to the SW 105 km SSE of Perryville, Alaska (USA) 46 reportsInfo
May 31, 2016 11:51 am (GMT -9)
5.7

26 km		38 km (24 mi) to the W 75 km SE of Perryville, Alaska 1 reportInfo
Dec 7, 2013 07:44 am (GMT -9)
5.5

13 km		15 km (9.5 mi) to the S 119km ENE of Chernabura Island, Alaska Info
Mar 10, 2012 05:10 am (GMT -9)
5.5

44 km		57 km (36 mi) to the SE south of Alaska (USA) Info
Jun 23, 2001 04:51 pm (Universal Time)
5.5

35 km		101 km (62 mi) to the W Alaska Peninsula (USA) Info
Feb 7, 1996 12:19 pm (GMT -9)
5.6

33 km		111 km (69 mi) to the SE south of Alaska (USA) Info
May 30, 1991 05:17 am (Anchorage)
7.0

28 km		255 km (158 mi) to the W Alaska Peninsula (USA) Info
Sep 4, 1989 04:14 am (GMT -9)
7.0

11 km		89 km (56 mi) to the E south of Alaska (USA) Info
Sep 4, 1989 04:14 am (GMT -9)
7.0

11 km		89 km (56 mi) to the E 229 mi southwest of Kodiak, Kodiak Island Borough, Alaska, United States Info
Jan 1, 1985 08:32 pm (GMT -9)
6.0

33 km		11 km (7.1 mi) to the N Alaska Peninsula (USA) Info
Feb 13, 1983 11:10 pm (Anchorage)
5.9

33 km		97 km (60 mi) to the SW south of Alaska (USA) Info
Feb 13, 1983 06:20 pm (Anchorage)
6.5

47 km		96 km (60 mi) to the SW south of Alaska (USA) Info
Feb 12, 1979 08:34 pm (GMT -9)
6.7

33 km		45 km (28 mi) to the E Alaska Peninsula (USA) Info
Mar 23, 1972 06:38 pm (GMT -9)
6.4

68 km		95 km (59 mi) to the N Alaska Peninsula (USA) Info
Feb 21, 1972 07:34 pm (GMT +0)
5.8

54 km		70 km (43 mi) to the NW Alaska Peninsula (USA) Info
Jun 22, 1970 05:39 am (GMT -9)
5.6

25 km		83 km (52 mi) to the E 154 mi east of Sand Point, Aleutians East, Alaska, United States Info
May 14, 1948 10:31 pm (Universal Time)
7.1

25 km		227 km (141 mi) to the W Alaska Peninsula (USA) Info
Mar 18, 1945 06:54 pm (Universal Time)
6.2

25 km		92 km (57 mi) to the SE south of Alaska (USA) Info
Dec 23, 1938 09:14 am (GMT -9)
5.9

15 km		83 km (52 mi) to the SE 182 km SE of Perryville, Alaska Info
Nov 17, 1938 03:54 am (Universal Time)
6.9

35 km		12 km (7.2 mi) to the NE Alaska Peninsula (USA) Info
Nov 11, 1938 12:57 am (Universal Time)
6.6

35 km		61 km (38 mi) to the SW Alaska Peninsula (USA) Info
Nov 10, 1938 08:18 pm (Universal Time)
8.2

35 km		27 km (17 mi) to the SW Alaska Peninsula Info
Jul 28, 1934 09:37 pm (Universal Time)
6.6

20 km		78 km (48 mi) to the NE south of Alaska (USA) Info
Nov 2, 1930 07:38 am (GMT -9)
5.8

55 km		74 km (46 mi) to the W 43 km SSE of Perryville, Alaska Info
Aug 5, 1927 03:14 pm (GMT -9)
6.2

35 km		37 km (23 mi) to the W 74 km SE of Perryville, Alaska Info
Jul 28, 1927 07:17 am (GMT -9)
6.2

55 km		56 km (35 mi) to the W 64 km SSE of Perryville, Alaska Info
May 4, 1923 04:26 pm (Universal Time)
7.0

25 km		88 km (55 mi) to the NE south of Alaska (USA) Info
May 31, 1917 08:47 am (Universal Time)
7.4

35 km		135 km (84 mi) to the W south of Alaska (USA) Info
Dec 23, 1906 08:22 am (Anchorage)
7.3

0 km		298 km (185 mi) to the NE 12 mi southeast of Akhiok, Kodiak Island Borough, Alaska, United States Info

Map of earlier quakes in the area of this quake

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