2021Contra Costa County

San Ramon Earthquakes 2021

532 earthquakes were recorded within 30 miles of San Ramon in 2021, including M3.9 as the largest.

2020 2021 2022 2023 2024 2025 2026

Total

532

earthquakes

Largest

M3.9

magnitude

Average

M1.4

magnitude

Monthly Avg

per month

Magnitude Distribution

467

M0-2

M2-3

M3-4

M4+

Notable Earthquakes (M3.0+)

Monthly Breakdown

January

Max: M3.0

February

Max: M2.6

March

Max: M2.5

April

Max: M2.8

May

Max: M2.2

June

Max: M3.9

July

Max: M2.1

August

Max: M2.5

September

Max: M3.1

October

Max: M3.4

November

Max: M3.9

December

Max: M2.5

All Earthquakes (100 shown)

San Ramon TodayLive earthquake activity San Ramon OverviewAll-time data & analysis San Ramon RegionRegional seismic data

About San Ramon Earthquake History

San Ramon is located in Contra Costa County, California, within the seismically active San Francisco Bay Area. The region experiences regular seismic activity due to its proximity to major fault lines, including the Calaveras Fault.

This page provides a complete record of all earthquakes detected within 30 miles ofSan Ramon during 2021. The data is sourced from the USGS earthquake monitoring network, which operates a comprehensive array of seismometers throughout California.

For real-time earthquake information, visit the San Ramon Earthquake Today page, or explore our earthquake preparedness guide to learn how to stay safe.

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