Latest quakes in or near Contra Costa County - list, stats and map
Latest See all | Mag. 1.6 earthquake 2 km SW of Blackhawk - CA - |
Strongest past 7 days | Mag. 4.2 16 mi north of Salinas - California, United States - Sep 29, 2024 - |
- 0 quakes above magnitude 4
- 2 quakes between magnitude 2 and 3
- 13 quakes below magnitude 2 that people normally don't feel.
Date and Time | Mag Depth | Nearest Volcano | Location | Details | Map |
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Oct 5, 02:45 am (Los Angeles) | 1.6 6.3 km | 2 km SW of Blackhawk, CA | Info | ||
Oct 4, 08:44 pm (Los Angeles) | 1.3 5.1 km | 24 km (15 mi) to the SE | 9.2 mi southeast of Livermore, Alameda County, California, United States | Info | |
Oct 4, 07:01 pm (Los Angeles) | 1.9 3.8 km | 1 km WNW of Kensington, CA | Info | ||
Friday, October 4, 2024 GMT (2 quakes) | |||||
Oct 4, 03:29 pm (Los Angeles) | 1.0 6.9 km | 34 km (21 mi) to the SW | 4 km WNW of Hillsborough, CA | Info | |
Oct 3, 06:03 pm (Los Angeles) | 1.1 12 km | 2.5 mi south of Concord, Contra Costa County, California, United States | Info | ||
Thursday, October 3, 2024 GMT (4 quakes) | |||||
Oct 3, 07:32 am (Los Angeles) | 1.3 2.6 km | 12 km (7.5 mi) to the S | 3 mi southeast of Hayward, Alameda County, California, United States | Info | |
Oct 3, 07:14 am (Los Angeles) | 1.2 2.1 km | 12 km (7.5 mi) to the S | 2.9 mi southeast of Hayward, Alameda County, California, United States | Info | |
Oct 2, 08:14 pm (Los Angeles) | 1.6 7.5 km | 35 km (22 mi) to the SW | 5 km WSW of Millbrae, CA | Info | |
Oct 2, 05:40 pm (Los Angeles) | 2.5 10.7 km | 3 km E of Pacheco, CA 1 report | Info |
Contra Costa Quake-O-Meter
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Earthquake statistics
Average number of earthquakes
- Mag. 6 or higher: 0.06 quakes per year (or 1 quake every 15.6 years)
- Mag. 5 or higher: 0.22 quakes per year (or 1 quake every 4.5 years)
- Mag. 4 or higher: 1.43 quakes per year
- Mag. 3 or higher: 12.2 quakes per year
- Mag. 2 or higher: 107 quakes per year (or 8.9 quakes per month)
- Mag. 1 or higher: 451 quakes per year (or 37.6 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 high level of seismic activity. Based on data from the past 54 years and our earthquake archive back to 1900, there are about 497 quakes on average per year in or near Contra Costa County. Contra Costa has had at least 8 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 15 to 20 years.
+How many earthquakes occur every year in or near Contra Costa County?
On average, Contra Costa has about 107 quakes of magnitude 2 or higher per year (Mag 3+: 12.2 quakes per year).
+When was the latest earthquake in or near Contra Costa County?
The last earthquake in or near Contra Costa County occurred 6 hours ago and had a magnitude of 1.6:
A light magnitude 1.6 earthquake hit 5.8 km (3.6 mi) away from San Ramon, California, United States, in the early morning of Saturday, Oct 5, 2024 at 2.45 am local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 6.3 km (3.9 mi) and was too small to be felt by people.
+How many quakes were there in or near Contra Costa County in the past 7 days?
In the past 7 days, Contra Costa County has had 0 quakes of magnitude 4.0 or above and 2 quakes between 2.0 and 3.0. There were also 13 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 7 days?
The strongest earthquake in or near Contra Costa County in the past 7 days had a magnitude of 4.2 and occurred 6 days ago:
A moderate magnitude 4.2 earthquake hit 26 km (16 mi) away from Salinas, California, United States, in the early morning of Sunday, Sep 29, 2024 at 2.47 am local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 6.9 km (4.3 mi) and was felt widely in the area.
Embed or share standalone map
You can use the standalone version of our interactive earthquake map or embed it on your website:Largest Quakes in or near Contra Costa County
Date and Time | Mag Depth | ###DIST_LABEL### | Location | Details | Map |
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