Back to map
United States · California

M1.1 Earthquake near Riverside County, California (United States)

UTC time: 2026-09-28 21:18:00 UTC Local time: —

Map

About this earthquake

A magnitude M1.1 earthquake was recorded near Riverside County, California (United States) on September 28, 2026 at 21:18 UTC. With a focal depth of about 6 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 175 earthquakes, the strongest at M4.1.

Details

ID
83ef29557cd1f4cfdb77db2ccae20095096aca20
Magnitude
M1.1
Depth
6.1 km
UTC time
2026-09-28 21:18:00 UTC
Local time
—
Country
United States
State
California
City
Riverside County
County
Riverside County
Source
usgs
Coordinates
33.77767, -117.54784
Temperature
29.9°C

Depth profile

Depth profile Depth: 6.1 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 6.1 km
Shallow
6.1 km
6.1 km — shallower than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Salton Buttes
    Distance: 190 km ·Lava dome(s) ·Elevation: -40 m ·Last eruption: 210 ·United States
  • Ubehebe Craters
    Distance: 361 km ·Maar(s) ·Elevation: 752 m ·Last eruption: -150 ·United States
  • Pinacate
    Distance: 435 km ·Volcanic field ·Elevation: 1'183 m ·Mexico
  • Mammoth Mountain
    Distance: 449 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Mono-Inyo Craters
    Distance: 467 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mono Lake Volcanic Field
    Distance: 488 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Ontario International AirportUnited States · ONT · KONT
    31.3 kmStraight-line distance
  • John Wayne Orange County International AirportUnited States · SNA · KSNA
    31.8 kmStraight-line distance
  • San Bernardino International AirportUnited States · SBD · KSBD
    45.6 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-28

Nuclear power plants

  • San Onofre nuclear power plantUnited StatesPermanently shut downReactor units at site: 3
    45.5 kmStraight-line distance

Source: Global Energy Monitor · Global Nuclear Power Tracker · Dataset date: 2026-08

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

California

Context for this earthquake

28 Sep 2025 – 28 Sep 2026 · M ≥ 2.0 · 2,436 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

Open history map
Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

Share