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M3.0 Depth: 9.9 km

M3.0 Earthquake near 4 km SE of San Ramon, CA (United States)

UTC time: 2025-12-21 02:53:48 UTC Local time: —

About this earthquake

A magnitude M3.0 earthquake was recorded near 4 km SE of San Ramon, CA (United States) on December 21, 2025 at 02:53 UTC. The hypocenter lay relatively close to the surface at around 10 km, increasing how strongly it was felt. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 228 earthquakes, the strongest at M6.0.

Details

Magnitude
M3.0
Depth
9.9 km
UTC time
2025-12-21 02:53:48 UTC
Local time
—
Country
United States
City
California
Source
usgs
Coordinates
37.75083, -121.94366
Temperature
13.4°C

Map

Depth profile

Depth profile Depth: 9.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 9.9 km
Shallow
9.9 km
9.9 km — shallower than the regional average (15.7 km)
Regional average: 15.7 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: 154 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono-Inyo Craters
    Distance: 256 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mammoth Mountain
    Distance: 257 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Mono Lake Volcanic Field
    Distance: 257 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Lassen Volcanic Center
    Distance: 307 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Soda Lakes
    Distance: 331 km ·Maar(s) ·Elevation: 1'251 m ·United States

Historic earthquake map · United States

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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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