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M1.0 Depth: 7.0 km

M1.0 Earthquake near 3 km of Piedmont, CA (United States)

UTC time: 2025-09-23 16:57:11 UTC Local time: —

About this earthquake

A magnitude M1.0 earthquake was recorded near 3 km of Piedmont, CA (United States) on September 23, 2025 at 16:57 UTC. The hypocenter lay relatively close to the surface at around 7 km, increasing how strongly it was felt. Earthquakes of this small magnitude are usually barely noticeable and cause no damage.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 172 earthquakes, the strongest at M3.7.

Details

Magnitude
M1.0
Depth
7.0 km
UTC time
2025-09-23 16:57:11 UTC
Local time
—
Country
United States
City
California
Source
usgs
Coordinates
37.85450, -122.24033
Temperature
30.3°C

Map

Depth profile

Depth profile Depth: 7 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 7 km
Shallow
7 km
7 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: 132 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono Lake Volcanic Field
    Distance: 282 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Mono-Inyo Craters
    Distance: 282 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mammoth Mountain
    Distance: 283 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Lassen Volcanic Center
    Distance: 300 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Soda Lakes
    Distance: 346 km ·Maar(s) ·Elevation: 1'251 m ·United States

Historic earthquake map · United States

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Country statistics · United States

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

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