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Strong mag. 6.1 Earthquake - Vanuatu Islands on Monday, Oct 18, 2021, at 06:26 pm (Efate time)

A very strong magnitude 6.1 earthquake occurred in the Coral Sea near the coast of  Vanuatu in the late afternoon of Monday, Oct 18, 2021 at 6.26 pm local time (Pacific/Efate GMT +11). The quake had a moderate depth of 105 km (65 mi) and was reported felt by some people near the epicenter.

Strong mag. 6.1 Earthquake - Vanuatu Islands on Monday, Oct 18, 2021, at 06:26 pm (Efate time) Strong mag. 6.1 Earthquake - Vanuatu Islands on Monday, Oct 18, 2021, at 06:26 pm (Efate time)
Strong magnitude 6.1 earthquake at 105 km depth
18 Oct 07:35 UTC: First to report: GFZ after 8 minutes.
18 Oct 07:37: Hypocenter depth recalculated from 104.0 to 105.0 km (from 65 to 65 mi). Epicenter location corrected by 6.9 km (4.3 mi) towards ENE.
18 Oct 08:21: Magnitude recalculated from 6.0 to 6.1.

Earthquake details

Date & timeOct 18, 2021 07:26:53 UTC
Local time at epicenterMonday, Oct 18, 2021, at 06:26 pm (Pacific/Efate GMT +11)
StatusConfirmed
Magnitude6.1
Depth105 km
Epicenter latitude / longitude13.68°S / 166.93°E Coral Sea, Vanuatu
Seismic antipode13.68°N / 13.07°W Senegal
Shaking intensityIV Light shaking near epicenter
Felt2 reports
Primary data sourceGFZ (German Research Centre for Geosciences)
Nearest volcanoSuretamatai (60 km / 37 mi)
Weather at epicenter at time of quakeOvercast Clouds 28.4°C (83 F), humidity: 74%, wind: 4 m/s (9 kts) from E
Estimated seismic energy released8.9 x 1013 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) | about seismic energy
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Nearby places

The closest larger town where the quake might have been felt is Sola, a town with 1,200 inhabitants in Vanuatu, in 71 km (44 mi) distance east of the epicenter. People likely experienced light 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
71 km (44 mi)
E of epicenter
Sola
(pop: 1,170)
IV: Light
Torba
152 km (95 mi)
S of epicenter
Port-Olry
(pop: 1,950)
IV: Light
Santo/Malo
206 km (128 mi)
S of epicenter
Santo
(pop: 13,400)
IV: Light
Santo/Malo
270 km (168 mi)
S of epicenter
Norsup
(pop: 3,000)
III: Weak
Malampa
351 km (218 mi)
N of epicenter
Lata
(pop: 553)
III: Weak
Temotu
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake (4)

We received 4 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.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Translate
Vanuatu Islands / Strong shaking (MMI VI) / vertical swinging (up and down) / 20-30 s : I was just sitting on my sofa watching TV with my parents, getting ready to go to my friend's house to do our homework together. Suddenly my light started shaking that it almost fell to the table. Luckily it didn't, just a few parts of the light broke. My | 13 users found this interesting.  
Vanuatu / not felt : No, I didn't felt anything  
Port Vila / Weak shaking (MMI III) / 2-5 s : Very mild, only slight movement  
Tully, north coast Qld, Australia / not felt

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
2021-10-18
Epicenter Agency
6.1 105 km
65 mi
07:26:53 Vanuatu Islands GFZ (German Research Centre for Geosciences)
6.1 100 km
62 mi
07:26:52 VANUATU
10.3 km (6.4 mi) epicenter difference with GFZ
EMSC (European-Mediterranean Seismological Centre)
6.0 106 km
66 mi
07:26:54 Vanuatu Islands
8.1 km (5 mi) epicenter difference with GFZ
BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
5.7 121 km
75 mi
07:26:55 Vanuatu: Near Nouméa
6.3 km (3.9 mi) epicenter difference with GFZ
RENASS (Réseau National de Surveillance Sismique (RéNaSS))
6.0 106 km
66 mi
07:26:53 Vanuatu Islands [Sea: Vanuatu]
3.6 km (2.2 mi) epicenter difference with GFZ
INGV (Istituto Nazionale di Geofisica e Vulcanologia)
6.2 93 km
58 mi
07:26:52 59 km WNW of Sola, Vanuatu
12 km (7.4 mi) epicenter difference with GFZ
USGS (United States Geological Survey)
5.9 103 km
64 mi
07:26:52 Vanuatu Islands
2.8 km (1.7 mi) epicenter difference with GFZ
GeoAu (Geoscience Australia )

Seismograms

Seismic station: Honiara, Solomon Islands (HNR/IU network) | Distance from quake: 895 km / 556 mi | Show on map | Station Info
Seismic station Honiara, Solomon Islands: 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: 0.02-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

2 aftershocks for this quake

For this earthquake, 2 aftershocks have been detected so far. The strongest was a magnitude 4.5 quake that hit 7 weeks after the mainshock in 9.9 km (6.1 mi) distance, in 61 km WNW of Sola, Vanuatu, on Wednesday, Dec 8, 2021 on 03:55 am (- local time GMT +11).

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. 126 km2 (=49 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 19 km (12 mi).
[More info]


Recorded aftershocks, latest first (2 quakes)

Date and Time GMTMag
Depth
DistanceRegionDetails
Dec 8, 2021 03:55 am (GMT +11)
2 years ago
7 weeks after main shock
4.5

115 km
9.9 km (6.1 mi)
E of main shock
61 km WNW of Sola, VanuatuMore
Nov 29, 2021 02:59 am (GMT +11)
2 years ago
6 weeks after main shock
4.1

106 km
22 km (13 mi)
E of main shock
VanuatuMore
Oct 18, 2021 06:26 pm (Efate)
3 years ago - felt
6.1

105 km
0 km - This quakeCoral Sea, 73 km SE of Hiw Island, Torba, Vanuatu
Main Shock (this quake)
More

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 34.5 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 7 or higher: 0.1 quakes per year (or 1 quake every 10.3 years)
  • Mag. 6 or higher: 1.02 quakes per year
  • Mag. 5 or higher: 9.3 quakes per year
  • Mag. 4 or higher: 37.2 quakes per year (or 3.1 quakes per month)
  • Mag. 3 or higher: 38.1 quakes per year (or 3.2 quakes per month)
  • Mag. 2 or higher: 38.1 quakes per year (or 3.2 quakes per month)
The area where this quake occurred has a very high level of seismic activity. It has had at least 12 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 10 to 15 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

The earthquake occurred 33 weeks after a magnitude 6.1 earthquake had hit on Friday, Mar 5, 2021, at 03:53 am local time (Pacific/Efate GMT +11) in 96 km (60 mi) distance to the southeast:
Mag. 6.1 earthquake Coral Sea - Torba, Vanuatu - Mar 5, 2021 -
The largest quake near the epicenter of this quake during the 10 years before was an event of magnitude 7.1. It had occurred 6 years earlier, on Wednesday, Oct 21, 2015, at 08:52 am local time (Pacific/Efate GMT +11) in Coral Sea,  Vanuatu:
Mag. 7.1 earthquake Coral Sea - Santo/Malo, Vanuatu - Oct 21, 2015 -
The strongest-ever (since 1900) recorded quake in this area measured magnitude 7.9. It had occurred 44 years ago earlier, on Friday, Jul 18, 1980, at 06:42 am (GMT +11 local time) in Coral Sea,  Vanuatu:
Mag. 7.9 earthquake Coral Sea - Torba, Vanuatu - Jul 18, 1980 -
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
Oct 14, 2021 09:25 am (Efate)
4.5

198 km
72 km (45 mi) to the SE Coral Sea, 139 km northwest of Maewo Island, Penama, Vanuatu
Info
Sep 30, 2021 11:07 pm (Efate)
5.1

172 km
28 km (18 mi) to the SE Vanuatu Islands Info
Sep 19, 2021 03:24 pm (Efate)
5.1

54 km
55 km (34 mi) to the NE VANUATU Info
Sep 17, 2021 09:48 pm (Efate)
4.8

10 km
56 km (35 mi) to the NE 55 Km NNW of Sola, Vanuatu
Info
Sep 17, 2021 09:28 pm (Efate)
5.8

15 km
71 km (44 mi) to the NE Vanuatu Islands 2 reportsInfo
Mar 5, 2021 03:53 am (Efate)
6.1

191 km
96 km (60 mi) to the SE Coral Sea, 72 km southwest of Sola, Torba, Vanuatu 4 reportsInfo
Mar 18, 2020 02:13 pm (Efate)
6.1

194 km
60 km (37 mi) to the N Vanuatu Islands Info
Jan 16, 2019 05:06 am (Efate)
6.5

10 km
49 km (30 mi) to the NW Vanuatu Islands 2 reportsInfo
Apr 29, 2016 06:33 am (Efate)
7.0

28 km
269 km (167 mi) to the S Coral Sea, 27 km northwest of Malakula Island, Malampa, Vanuatu 2 reportsInfo
Apr 15, 2016 08:50 am (Efate)
6.3

13 km
87 km (54 mi) to the SW Vanuatu Islands Info
Apr 7, 2016 02:32 pm (Efate)
6.6

31 km
37 km (23 mi) to the SW Coral Sea, 467 km northwest of Port Vila, Shefa, Vanuatu 1 reportInfo
Apr 6, 2016 05:58 pm (Efate)
6.7

30 km
57 km (35 mi) to the S Vanuatu Islands 1 reportInfo
Apr 3, 2016 07:23 pm (Efate)
6.8

40 km
64 km (40 mi) to the S Vanuatu Islands 1 reportInfo
Oct 21, 2015 08:52 am (Efate)
7.1

143 km
138 km (86 mi) to the S Coral Sea, 33 km northeast of Port-Olry, Santo/Malo, Vanuatu 8 reportsInfo
Jan 2, 2014 03:03 am (Efate)
6.5

187 km
40 km (25 mi) to the SE 37km W of Sola, Vanuatu 2 reportsInfo
Dec 22, 2012 09:28 am (Efate)
6.7

201 km
83 km (52 mi) to the SE 63km SSW of Sola, Vanuatu 3 reportsInfo
Jul 2, 2010 05:04 pm (GMT +11)
6.3

29 km
48 km (30 mi) to the W Vanuatu Info
May 28, 2010 04:14 am (GMT +11)
7.2

31 km
31 km (19 mi) to the W Vanuatu Info
Mar 5, 2010 01:02 am (Efate)
6.5

176 km
34 km (21 mi) to the E Vanuatu Info
Oct 8, 2009 10:13 am (Efate)
7.4

31 km
80 km (50 mi) to the NW Vanuatu Info
Oct 8, 2009 09:18 am (GMT +11)
7.8

35 km
142 km (88 mi) to the NW 196 km NW of Sola, Vanuatu Info
Oct 8, 2009 09:03 am (Efate)
7.7

45 km
88 km (54 mi) to the NW Coral Sea, 15 km north of Hiw Island, Torba, Vanuatu Info
Sep 9, 2008 05:52 am (GMT +11)
6.9

110 km
20 km (13 mi) to the N Vanuatu Info
Sep 2, 2007 12:05 pm (GMT +11)
7.2

35 km
263 km (163 mi) to the NW 97 km S of Lata, Solomon Islands Info
Aug 2, 2007 04:08 am (Efate)
7.2

120 km
228 km (142 mi) to the S Info
Jan 10, 2001 03:49 am (Efate)
7.1

103 km
141 km (88 mi) to the S Vanuatu Info
Oct 5, 2000 03:58 am (Efate)
7.0

23 km
194 km (120 mi) to the S Vanuatu Info
Feb 7, 1999 08:47 am (GMT +11)
7.3

90 km
95 km (59 mi) to the N 146 km NW of Sola, Vanuatu Info
Nov 16, 1997 05:59 am (GMT +11)
7.0

123 km
170 km (106 mi) to the S Vanuatu Info
Apr 21, 1997 11:02 pm (GMT +11)
7.7

33 km
125 km (78 mi) to the N 171 km NNW of Sola, Vanuatu Info
Jul 27, 1990 11:38 pm (Efate)
7.2

126 km
195 km (121 mi) to the S Coral Sea, 37 km northeast of Santo, Santo/Malo, Vanuatu Info
Dec 21, 1985 12:13 pm (Efate)
7.1

43 km
55 km (34 mi) to the SW Vanuatu Info
Nov 28, 1985 02:49 pm (GMT +11)
7.0

33 km
87 km (54 mi) to the SW Vanuatu Info
Nov 28, 1985 01:25 pm (GMT +11)
7.0

33 km
85 km (53 mi) to the SW Vanuatu Info
Aug 6, 1982 07:32 am (GMT +11)
7.0

31 km
162 km (101 mi) to the NW Santa Cruz Islands (Vanuatu) Info
Jul 18, 1980 06:42 am (GMT +11)
7.9

33 km
169 km (105 mi) to the NW Santa Cruz Islands (Vanuatu) Info
Jul 9, 1980 10:19 am (GMT +11)
7.5

33 km
153 km (95 mi) to the NW Santa Cruz Islands (Vanuatu) Info
Oct 7, 1975 09:24 am (GMT +11)
7.0

54 km
137 km (85 mi) to the N 188 km NW of Sola, Vanuatu Info
Jan 10, 1974 07:51 pm (Efate)
7.2

34 km
84 km (52 mi) to the S Vanuatu Info
Dec 29, 1973 11:19 am (Efate)
7.2

47 km
160 km (99 mi) to the S Info
Dec 29, 1973 12:41 am (Efate)
7.5

26 km
94 km (59 mi) to the S Info
Feb 15, 1972 10:29 am (Guadalcanal)
7.4

102 km
253 km (157 mi) to the N 102 km SE of Lata, Solomon Islands Info
Jan 24, 1972 08:17 am (Efate)
7.1

35 km
74 km (46 mi) to the NW Coral Sea, 20 km southwest of Hiw Island, Torba, Vanuatu Info
Nov 21, 1971 04:57 pm (GMT +11)
7.1

113 km
207 km (128 mi) to the N 150 km SSE of Lata, Solomon Islands Info
Jan 20, 1969 05:50 am (GMT +11)
7.1

113 km
138 km (85 mi) to the S Vanuatu Info
Jan 1, 1967 09:15 am (GMT +11)
7.1

35 km
158 km (98 mi) to the N 192 km SSE of Lata, Solomon Islands Info
Jan 1, 1967 05:23 am (GMT +11)
7.8

55 km
181 km (113 mi) to the N 172 km SSE of Lata, Solomon Islands Info
Dec 1, 1966 03:56 pm (Efate)
6.8

125 km
33 km (20 mi) to the SE Vanuatu Info
Aug 13, 1965 11:40 pm (Efate)
7.4

25 km
261 km (162 mi) to the S Coral Sea, 46 km west of Norsup, Malampa, Vanuatu Info
Aug 12, 1965 09:31 am (Efate)
7.6

30 km
243 km (151 mi) to the S Info
Aug 11, 1965 02:40 pm (Efate)
7.2

25 km
197 km (122 mi) to the S Vanuatu Info
May 20, 1965 11:40 am (Efate)
7.7

120 km
139 km (86 mi) to the SE Vanuatu Info
Jan 11, 1965 12:36 am (Efate)
6.7

35 km
45 km (28 mi) to the NW Vanuatu Info
Jul 10, 1964 03:39 am (Efate)
7.2

130 km
221 km (137 mi) to the S Vanuatu Info
Jul 5, 1964 11:00 am (Efate)
7.5

0 km
208 km (129 mi) to the S Vanuatu Islands: Espiritu Santo Islands Info
Dec 18, 1957 12:50 am (GMT +11)
7.8

124 km
143 km (89 mi) to the N 186 km NNW of Sola, Vanuatu Info
Nov 14, 1953 06:15 am (Efate)
6.6

25 km
81 km (50 mi) to the NW Vanuatu Info
Nov 4, 1953 02:49 pm (Efate)
7.1

35 km
83 km (52 mi) to the NW Vanuatu Info
Nov 7, 1949 05:59 am (Universal Time)
6.7

35 km
63 km (39 mi) to the S Vanuatu Info
Jan 5, 1946 07:57 pm (Universal Time)
7.1

35 km
231 km (144 mi) to the S Vanuatu Info
Nov 16, 1944 12:11 pm (Universal Time)
7.1

35 km
220 km (137 mi) to the N 130 km SSE of Lata, Solomon Islands Info
Jul 2, 1937 02:37 am (Universal Time)
6.6

35 km
15 km (9.5 mi) to the E Vanuatu Info
Jul 19, 1934 07:36 am (Universal Time)
7.0

15 km
101 km (63 mi) to the NW Vanuatu Info
Jul 18, 1934 07:40 pm (Universal Time)
7.7

10 km
215 km (133 mi) to the N 138 km SSE of Lata, Solomon Islands Info
Oct 15, 1921 04:58 am (Universal Time)
7.0

35 km
106 km (66 mi) to the N Coral Sea, 63 km northeast of Hiw Island, Torba, Vanuatu Info
Jun 26, 1914 03:50 pm (Efate)
6.6

15 km
82 km (51 mi) to the NE 68 km N of Sola, Vanuatu Info
Nov 26, 1910 04:41 am (Universal Time)
7.2

35 km
96 km (59 mi) to the S 56 km N of Port-Olry, Vanuatu Info
Nov 10, 1910 11:19 pm (Efate)
7.2

0 km
59 km (36 mi) to the SW Vanuatu Islands: Espiritu Santo Info
Nov 9, 1910 06:02 am (Universal Time)
7.4

20 km
289 km (179 mi) to the S Vanuatu Info
Jun 27, 1909 07:15 am (Universal Time)
6.8

15 km
73 km (45 mi) to the E 4 km S of Sola, Vanuatu Info
Apr 10, 1909 05:27 am (Universal Time)
7.0

15 km
130 km (81 mi) to the S 46 km WNW of Port-Olry, Vanuatu Info
Feb 19, 1905 04:34 am (Universal Time)
7.3

15 km
277 km (172 mi) to the E South Pacific Ocean, 184 km northeast of Maewo Island, Penama, Vanuatu Info

Map of earlier quakes in the area of this quake

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Map to embed or share

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