M1.5 Depth: 9.2 km

M1.5 Earthquake near 8 km NNW of Petrolia, CA (United States)

UTC time: 2025-08-31 12:21:15 UTC Local time: —

About this earthquake

On August 31, 2025 at 12:21 UTC, a magnitude M1.5 earthquake occurred near 8 km NNW of Petrolia, CA (United States). The hypocenter lay relatively close to the surface at around 9 km, increasing how strongly it was felt. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 240 earthquakes were recorded in the past 24 hours, the strongest reaching M3.9.

Details

Magnitude

M1.5

Depth

9.2 km

UTC time

2025-08-31 12:21:15 UTC

Local time

—

Country

United States

City

California

Source

usgs

Coordinates

40.38150, -124.34150

Temperature

13.6°C

Map

Depth profile

Shallow

9.2 km

9.2 km — shallower than the regional average (15.4 km)

Regional average: 15.4 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

Clear Lake Volcanic Field

Distance: 207 km ·Volcanic field ·Elevation: 1'439 m ·United States
Shasta

Distance: 214 km ·Stratovolcano ·Elevation: 4'317 m ·Last eruption: 1250 ·United States
Lassen Volcanic Center

Distance: 240 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
Medicine Lake

Distance: 271 km ·Shield ·Elevation: 2'412 m ·Last eruption: 1060 ·United States
Escanaba Segment

Distance: 275 km ·Fissure vent(s) ·Elevation: -1'700 m ·Last eruption: -2260 ·United States
Jackson Segment

Distance: 300 km ·Fissure vent(s) ·Elevation: -3'100 m ·United States

Historic earthquake map · United States

Open history map

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Country statistics · United States

Country overview

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

Stats (last 24h)

Global (24h)

1008

Country (24h)