Riverside County, United States – Earthquakes

This page summarizes earthquakes in Riverside County (United States). The most recently recorded event was a magnitude M1.2 earthquake near Mountain Center on 2026-09-14 03:34:34 UTC. All event lists and map markers are limited to the last 30 days.

Seismic profile â†“

Earthquakes (last 30 days)

431

Max magnitude (last 30 days)

M3.0

Avg magnitude (last 30 days)

M1.09

Avg depth (last 30 days)

10 km

Seismic profile

Analysis period14 Sep 2025 – 14 Sep 2026Data as of: 14 Sep 2026 · 04:00 UTC

Minimum magnitude

What the data show

Riverside County · M ≥ 2.0

After source reconciliation, the catalogue contains 133 event entries of M2.0 or above for this area and period, spread over 85 days.

Catalogue entries13314 Sep 2025 – 14 Sep 2026

Strongest recorded earthquakeM4.9Riverside County ↗

Depth · median5.0 km130 events with valid depth

Last 30 days14Previous 30 days: 13

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

14 Sep 2025 – 14 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	14 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	48
February 2026	01 Feb 2026 – 28 Feb 2026	12
March 2026	01 Mar 2026 – 31 Mar 2026	2
April 2026	01 Apr 2026 – 30 Apr 2026	7
May 2026	01 May 2026 – 31 May 2026	17
June 2026	01 Jun 2026 – 30 Jun 2026	14
July 2026	01 Jul 2026 – 31 Jul 2026	15
August 2026	01 Aug 2026 – 31 Aug 2026	10
September 2026 · Partial month	01 Sep 2026 – 14 Sep 2026	8

How strong were the earthquakes?

Catalogue entries · 133

M 2.0 – < 3.0121

M 3.0 – < 4.010

M 4.0 – < 5.02

M 5.0 – < 6.00

M ≥ 6.00

At what depth did they occur?

130 events with valid depth

0 – < 30 km128

30 – < 70 km1

70 – < 300 km1

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 days14

Previous 30 days13

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 Riverside 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

14 Sep 2025 – 14 Sep 2026 · M ≥ 2.0

M4.9

Seismic profile

Riverside 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

Riverside County

Riverside County

Riverside County

Data and methodology

Source reports used

Map (last 30 days)

About Riverside County

Seismic activity in 2026

Earthquakes in Riverside County (last 30 days)