California, United States – Earthquakes

This page summarizes earthquakes in California (United States). The most recently recorded event was a magnitude M1.0 earthquake near Sonoma County on 2026-09-06 11:20:44 UTC. All event lists and map markers are limited to the last 30 days.

Seismic profile â†“

Earthquakes (last 30 days)

3018

Max magnitude (last 30 days)

M4.1

Avg magnitude (last 30 days)

M1.27

Avg depth (last 30 days)

6 km

Seismic profile

Analysis period06 Sep 2025 – 06 Sep 2026Data as of: 06 Sep 2026 · 10:00 UTC

Minimum magnitude

What the data show

California · M ≥ 4.5

After source reconciliation, the catalogue contains 13 event entries of M4.5 or above for this area and period, spread over 6 days.

Catalogue entries1306 Sep 2025 – 06 Sep 2026

Strongest recorded earthquakeM5.8Mendocino County ↗

Depth · median9.0 km13 events with valid depth

Last 30 days0Previous 30 days: 0

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

06 Sep 2025 – 06 Sep 2026

Earthquakes by month

M ≥ 4.5

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	06 Sep 2025 – 30 Sep 2025	1
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	6
January 2026	01 Jan 2026 – 31 Jan 2026	2
February 2026	01 Feb 2026 – 28 Feb 2026	0
March 2026	01 Mar 2026 – 31 Mar 2026	0
April 2026	01 Apr 2026 – 30 Apr 2026	0
May 2026	01 May 2026 – 31 May 2026	0
June 2026	01 Jun 2026 – 30 Jun 2026	4
July 2026	01 Jul 2026 – 31 Jul 2026	0
August 2026	01 Aug 2026 – 31 Aug 2026	0
September 2026 · Partial month	01 Sep 2026 – 06 Sep 2026	0

How strong were the earthquakes?

Catalogue entries · 13

M 4.5 – < 5.07

M 5.0 – < 6.06

M ≥ 6.00

At what depth did they occur?

13 events with valid depth

0 – < 30 km13

30 – < 70 km0

70 – < 300 km0

300 – 750 km0

0 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 days0

Previous 30 days0

Median of the eleven previous 30-day periods0

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 California 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

06 Sep 2025 – 06 Sep 2026 · M ≥ 4.5

M5.8

Mendocino County

24 Jun 2026 · 15:10 UTC

Depth: 18.4 km · INGV

View event ↗

M5.6

Mendocino County

24 Jun 2026 · 15:10 UTC

Depth: 10.0 km · GFZ

View event ↗

M5.6

Mendocino County

24 Jun 2026 · 15:10 UTC

Depth: 8.1 km · USGS

View event ↗

Data and methodology

Analysis period: 06 Sep 2025 10:00 – 06 Sep 2026 10:00 UTC

Data and methodology

Reports are first reconciled using existing event associations. Additional reports from different sources are consolidated only when every pair is within 5 seconds, 10 km and 0.5 magnitude units, source groups do not overlap and exactly one group matches. Ambiguous cases remain separate. The preferred report determines magnitude, time and area; period and magnitude filters are applied afterwards. The start is included and the end excluded (UTC).

4 additional source reports were consolidated during source reconciliation.

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

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

Source reports used

The preferred report of each group is counted. Source priority follows the earthquake list. Different magnitude types and recording gaps limit comparability.

USGS7
GFZ3
SERBIA_RSZ1
INGV1
SCEDC1

The profile is recalculated hourly from the earthquake catalogue. Later source revisions may also change historical values.

Data as of: 06 Sep 2026 · 10:32 UTC

Map (last 30 days)

< 2 2–4 4–5 ≥ 5

About California

California is a U.S. state in the Western United States that lies on the Pacific Coast. It borders Oregon to the north, and Nevada and Arizona to the east; it also shares an international border with the Mexican state of Baja California to the south.

Seismic activity in 2026

In 2026, California recorded 16614 earthquakes within United States. The average magnitude was M1.27. The strongest event reached M5.8.

Based on the number of recorded earthquakes in 2026, California is currently among the Top 5 most active regions in United States (rank #1 by count).

Considering the strongest recorded event in 2026, California is among the Top 5 strongest regions in United States (rank #2 by max magnitude).

Located on the North America Plate.

Seismic profile

California · M ≥ 4.5

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

Mendocino County

Mendocino County

Mendocino County

Data and methodology

Source reports used

Map (last 30 days)

About California

Seismic activity in 2026

Earthquakes in California (last 30 days)