Latest quakes in or near Contra Costa County - list, stats and map
Overview
Latest quake See all | Mag. 1.0 earthquake United States, Santa Clara County, California - |
Strongest past 30 days | Mag. 3.5 United States, Contra Costa County, California - Feb 28, 2024 - |
- 1 quake above magnitude 3
- 9 quakes between magnitude 2 and 3
- 36 quakes below magnitude 2 that people normally don't feel.
Map and earthquake list
Date and Time | Mag Depth | Nearest Volcano | Location | Details | Map |
---|---|---|---|---|---|
Mar 27, 10:25 pm (Los Angeles) Mar 28, 05:25 GMT | 1.0 6.4 km | 38 km (24 mi) to the SE | 15 km ENE of Alum Rock, CA | Info | |
Wednesday, March 27, 2024 GMT (1 quake) | |||||
Mar 27, 11:32 am (Los Angeles) Mar 27, 18:32 GMT | 1.5 1.2 km | 3 km (1.9 mi) to the W | 7 km E of Santa Venetia, CA | Info | |
Monday, March 25, 2024 GMT (3 quakes) | |||||
Mar 25, 03:57 pm (Los Angeles) Mar 25, 22:57 GMT | 2.0 2.8 km | 46 km (29 mi) to the S | United States, 9.9 mi east of San Jose, Santa Clara County, California | Info | |
Mar 25, 05:17 am (Los Angeles) Mar 25, 12:17 GMT | 1.8 15 km | Contra Costa County, United States, 10 mi north of Livermore, Alameda County, California | Info | ||
Mar 25, 02:16 am (Los Angeles) Mar 25, 09:16 GMT | 1.4 5.8 km | 10 km (6.2 mi) to the S | United States, 0.8 mi east of Hayward, Alameda County, California | Info | |
Saturday, March 23, 2024 GMT (4 quakes) | |||||
Mar 23, 03:24 pm (Los Angeles) Mar 23, 22:24 GMT | 2.1 14 km | 12 km (7.5 mi) to the N | Solano County, United States, 8.2 mi north of Pittsburg, Contra Costa County, California | Info | |
Mar 23, 06:41 am (Los Angeles) Mar 23, 13:41 GMT | 1.1 2.4 km | 29 km (18 mi) to the SE | United States, 8.4 mi southeast of Livermore, Alameda County, California | Info | |
Mar 22, 09:13 pm (Los Angeles) Mar 23, 04:13 GMT | 1.8 8 km | 25 km (16 mi) to the SW | North Pacific Ocean, United States, 4.6 mi west of Daly City, San Mateo County, California | Info | |
Mar 22, 07:43 pm (Los Angeles) Mar 23, 02:43 GMT | 1.2 12 km | 3 km (1.9 mi) to the S | United States, 0.2 mi southeast of Dublin, Alameda County, California | Info | |
Friday, March 22, 2024 GMT (5 quakes) | |||||
Mar 22, 09:36 am (Los Angeles) Mar 22, 16:36 GMT | 2.6 11 km | 3 km SE of Pleasant Hill, CA 5 reports | Info | ||
Mar 22, 01:53 am (Los Angeles) Mar 22, 08:53 GMT | 1.0 8.4 km | 2 km NW of Alamo, CA | Info |
Contra Costa Quake-O-Meter
Latest seismic signals
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Earthquake statistics
Average number of earthquakes
- Mag. 7 or higher: 0.03 quakes per year (or 1 quake every 31.3 years)
- Mag. 6 or higher: 0.22 quakes per year (or 1 quake every 4.5 years)
- Mag. 5 or higher: 0.39 quakes per year (or 1 quake every 2.6 years)
- Mag. 4 or higher: 1.61 quakes per year
- Mag. 3 or higher: 12.5 quakes per year
- Mag. 2 or higher: 107 quakes per year (or 8.9 quakes per month)
- Mag. 1 or higher: 423 quakes per year (or 35.2 quakes per month)
Number of earthquakes over time
Contra Costa Earthquake FAQ
+How frequent are earthquakes in or near Contra Costa County?
Contra Costa has a very high level of seismic activity. Based on data from the past 54 years and our earthquake archive back to 1900, there are about 457 quakes on average per year in or near Contra Costa County. Contra Costa has had at least 4 quakes above magnitude 7 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 30 to 35 years.
+When was the latest earthquake in or near Contra Costa County?
The last earthquake in or near Contra Costa County occurred 1 day 5 hours ago and had a magnitude of 1.0:
A light magnitude 1.0 earthquake hit 22 km (14 mi) away from San Jose, California, United States, late in the evening of Wednesday, Mar 27, 2024 at 10.25 pm local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 6.4 km (4 mi) and was too small to be felt by people.
+How many quakes were there in or near Contra Costa County in the past 30 days?
In the past 30 days, Contra Costa County has had 1 quake of magnitude 3.5 and 9 quakes between 2.0 and 3.0. There have been also 36 quakes below magnitude 2.0 which people don't normally feel.
+What was the strongest quake in or near Contra Costa County in the past 30 days?
The strongest earthquake in or near Contra Costa County in the past 30 days had a magnitude of 3.5 and occurred 4 weeks ago:
A light magnitude 3.5 earthquake hit 7.5 km (4.7 mi) away from Brentwood, California, United States, in the late afternoon of Wednesday, Feb 28, 2024 at 6.21 pm local time (America/Los Angeles GMT -8). The quake had a very shallow depth of 8.2 km (5.1 mi) and was felt widely in the area.