Sonoma County, United States – Earthquakes

This page summarizes earthquakes in Sonoma County (United States). The most recently recorded event was a magnitude M0.8 earthquake near Sonoma County on 2026-09-15 01:42:34 UTC. All event lists and map markers are limited to the last 30 days.

Seismic profile â†“

Earthquakes (last 30 days)

707

Max magnitude (last 30 days)

M3.5

Avg magnitude (last 30 days)

M0.97

Avg depth (last 30 days)

3 km

Seismic profile

Analysis period15 Sep 2025 – 15 Sep 2026Data as of: 15 Sep 2026 · 01:00 UTC

Minimum magnitude

What the data show

Sonoma County · M ≥ 2.0

After source reconciliation, the catalogue contains 103 event entries of M2.0 or above for this area and period, spread over 75 days.

Catalogue entries10315 Sep 2025 – 15 Sep 2026

Strongest recorded earthquakeM4.3Sonoma County ↗

Depth · median2.4 km100 events with valid depth

Last 30 days13Previous 30 days: 24

These figures describe the stored catalogue. Recording, magnitude types and geographic attribution may vary by source and period; completeness has not been established.

15 Sep 2025 – 15 Sep 2026

Earthquakes by month

M ≥ 2.0

Each bar counts events within the selected period. Hatched months are only partially included.

Sep2025

Oct2025

Nov2025

Dec2025

Jan2026

Feb2026

Mar2026

Apr2026

May2026

Jun2026

Jul2026

Aug2026

Sep2026

View data table

Month	Analysis period	Catalogue entries
September 2025 · Partial month	15 Sep 2025 – 30 Sep 2025	0
October 2025	01 Oct 2025 – 31 Oct 2025	0
November 2025	01 Nov 2025 – 30 Nov 2025	0
December 2025	01 Dec 2025 – 31 Dec 2025	0
January 2026	01 Jan 2026 – 31 Jan 2026	14
February 2026	01 Feb 2026 – 28 Feb 2026	17
March 2026	01 Mar 2026 – 31 Mar 2026	3
April 2026	01 Apr 2026 – 30 Apr 2026	8
May 2026	01 May 2026 – 31 May 2026	9
June 2026	01 Jun 2026 – 30 Jun 2026	9
July 2026	01 Jul 2026 – 31 Jul 2026	16
August 2026	01 Aug 2026 – 31 Aug 2026	20
September 2026 · Partial month	01 Sep 2026 – 15 Sep 2026	7

How strong were the earthquakes?

Catalogue entries · 103

M 2.0 – < 3.090

M 3.0 – < 4.010

M 4.0 – < 5.03

M 5.0 – < 6.00

M ≥ 6.00

At what depth did they occur?

100 events with valid depth

0 – < 30 km100

30 – < 70 km0

70 – < 300 km0

300 – 750 km0

3 events without valid depth are excluded here.

Depth · median

Half of the available values lie on either side of the median; ties are possible.

Current period in context

Last 30 days13

Previous 30 days24

Median of the eleven previous 30-day periods8

Same magnitude threshold, separate periods. Differences may also reflect changes in recording. No hazard level or forecast is inferred.

Where were earthquakes recorded?

Events assigned to Sonoma County in the stored location data are analysed. This is not a radius search. Missing or different attributions are excluded.

The interactive map complements the event links on this page.

Marker size and colour indicate magnitude.

Strongest recorded earthquake

15 Sep 2025 – 15 Sep 2026 · M ≥ 2.0

M4.3

Seismic profile

Sonoma County · M ≥ 2.0

Earthquakes by month

How strong were the earthquakes?

At what depth did they occur?

Current period in context

Where were earthquakes recorded?

Strongest recorded earthquake

Sonoma County

Sonoma County

Sonoma County

Data and methodology

Source reports used

Map (last 30 days)

About Sonoma County

Seismic activity in 2026

Earthquakes in Sonoma County (last 30 days)