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United States · California

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

UTC time: 2026-08-20 19:49:56 UTC Local time: —

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About this earthquake

A magnitude M1.1 earthquake was recorded near Riverside County, California (United States) on August 20, 2026 at 19:49 UTC. The hypocenter lay relatively close to the surface at around 13 km, increasing how strongly it was felt. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 186 earthquakes were recorded in the past 24 hours, the strongest reaching M4.1.

Details

ID
60c655d6a8ac7a1dfc1bb0a70a7193e336f4f5da
Magnitude
M1.1
Depth
12.6 km
UTC time
2026-08-20 19:49:56 UTC
Local time
—
Country
United States
State
California
City
Riverside County
County
Riverside County
Source
usgs
Coordinates
33.99267, -117.15517
Temperature
34.1°C

Depth profile

Depth profile Depth: 12.6 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 12.6 km
Shallow
12.6 km
12.6 km — close to 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: 168 km ·Lava dome(s) ·Elevation: -40 m ·Last eruption: 210 ·United States
  • Ubehebe Craters
    Distance: 338 km ·Maar(s) ·Elevation: 752 m ·Last eruption: -150 ·United States
  • Pinacate
    Distance: 416 km ·Volcanic field ·Elevation: 1'183 m ·Mexico
  • Mammoth Mountain
    Distance: 439 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Uinkaret Field
    Distance: 452 km ·Volcanic field ·Elevation: 1'555 m ·Last eruption: 1100 ·United States
  • Mono-Inyo Craters
    Distance: 456 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • San Bernardino International AirportUnited States · SBD · KSBD
    13.8 kmStraight-line distance
  • Ontario International AirportUnited States · ONT · KONT
    41.7 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-11-15

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

05 Oct 2025 – 05 Oct 2026 · M ≥ 2.0 · 2,447 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.

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