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United States · California

M3.4 Earthquake near Contra Costa County, California (United States)

UTC time: 2026-09-12 07:25:55 UTC Local time: —
Magnitude
M3.4
Depth
17.9 km
Source
USGS

California · Contra Costa County

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About this earthquake

On September 12, 2026 at 07:25 UTC, a magnitude M3.4 earthquake occurred near Contra Costa County, California (United States). With a focal depth of about 18 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude are often felt but rarely cause damage.

The data is provided by USGS and cross-checked across seismological networks. United States: 258 earthquakes were recorded in the past 24 hours, the strongest reaching M5.4.

Depth profile

Depth profile Depth: 17.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 17.9 km
Shallow
17.9 km
17.9 km — close to 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

  • Clear Lake Volcanic Field
    Distance: 148 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono Lake Volcanic Field
    Distance: 243 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Mono-Inyo Craters
    Distance: 243 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mammoth Mountain
    Distance: 245 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Lassen Volcanic Center
    Distance: 292 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Soda Lakes
    Distance: 313 km ·Maar(s) ·Elevation: 1'251 m ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Buchanan FieldUnited States · CCR · KCCR
    26.0 kmStraight-line distance
  • Oakland San Francisco Bay AirportUnited States · OAK · KOAK
    40.7 kmStraight-line distance
  • Stockton Metropolitan AirportUnited States · SCK · KSCK
    49.4 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-12

Nuclear power plants

  • Vallecitos nuclear power plantUnited StatesPermanently shut downReactor units at site: 1
    29.3 kmStraight-line distance

Source: Global Energy Monitor · Global Nuclear Power Tracker · Dataset date: 2026-08

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

California

Context for this earthquake

12 Sep 2025 – 12 Sep 2026 · M ≥ 3.0 · 243 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

Open history map
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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