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United States · California

M1.5 Earthquake near Riverside County, California (United States)

UTC time: 2026-08-21 14:04:48 UTC Local time: —

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About this earthquake

On August 21, 2026 at 14:04 UTC, a magnitude M1.5 earthquake occurred near Riverside County, California (United States). The hypocenter lay relatively close to the surface at around 4 km, increasing how strongly it was felt. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 182 earthquakes were recorded in the past 24 hours, the strongest reaching M4.1.

Details

ID
898c8fe967bfb564926efc8dd4f32197c51cdd8f
Magnitude
M1.5
Depth
3.5 km
UTC time
2026-08-21 14:04:48 UTC
Local time
—
Country
United States
State
California
City
Riverside County
County
Riverside County
Source
usgs
Coordinates
33.76417, -115.64800
Temperature
30.5°C

Depth profile

Depth profile Depth: 3.5 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 3.5 km
Shallow
3.5 km
3.5 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: 63 km ·Lava dome(s) ·Elevation: -40 m ·Last eruption: 210 ·United States
  • Pinacate
    Distance: 293 km ·Volcanic field ·Elevation: 1'183 m ·Mexico
  • Uinkaret Field
    Distance: 370 km ·Volcanic field ·Elevation: 1'555 m ·Last eruption: 1100 ·United States
  • Ubehebe Craters
    Distance: 397 km ·Maar(s) ·Elevation: 752 m ·Last eruption: -150 ·United States
  • San Francisco Volcanic Field
    Distance: 404 km ·Volcanic field ·Elevation: 3'850 m ·Last eruption: 1075 ·United States
  • San Luis, Isla
    Distance: 438 km ·Tuff cone ·Elevation: 183 m ·Last eruption: -1141 ·Mexico

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.

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Historic earthquake map · United States

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Country statistics · United States

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