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M1.3 Depth: 7.8 km

M1.3 Earthquake near 4 km SE of San Ramon, CA (United States)

UTC time: 2025-12-20 13:37:13 UTC Local time: —

About this earthquake

A magnitude M1.3 earthquake was recorded near 4 km SE of San Ramon, CA (United States) on December 20, 2025 at 13:37 UTC. The hypocenter lay relatively close to the surface at around 8 km, increasing how strongly it was felt. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 223 earthquakes were recorded in the past 24 hours, the strongest reaching M6.0.

Details

Magnitude
M1.3
Depth
7.8 km
UTC time
2025-12-20 13:37:13 UTC
Local time
—
Country
United States
City
California
Source
usgs
Coordinates
37.75233, -121.94817
Temperature
14.2°C

Map

Depth profile

Depth profile Depth: 7.8 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 7.8 km
Shallow
7.8 km
7.8 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: 153 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono-Inyo Craters
    Distance: 257 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: 258 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: 332 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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