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United States · California

M1.2 Earthquake near Blackhawk, California (United States)

UTC time: 2026-09-01 20:34:57 UTC Local time: —

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About this earthquake

A magnitude M1.2 earthquake was recorded near Blackhawk, California (United States) on September 1, 2026 at 20:34 UTC. With a focal depth of about 7 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size typically go unnoticed.

The event was recorded by USGS. United States: 185 earthquakes were recorded in the past 24 hours, the strongest reaching M5.3.

Details

ID
05f91a0d27134f566348b5e878dcb7fa817e2e63
Magnitude
M1.2
Depth
6.9 km
UTC time
2026-09-01 20:34:57 UTC
Local time
—
Country
United States
State
California
City
Blackhawk
County
Contra Costa County
Village
Blackhawk
Source
usgs
Coordinates
37.81267, -121.90483
Temperature
21.4°C

Depth profile

Depth profile Depth: 6.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 6.9 km
Shallow
6.9 km
6.9 km — shallower than 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: 149 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono-Inyo Craters
    Distance: 253 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mono Lake Volcanic Field
    Distance: 253 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Mammoth Mountain
    Distance: 253 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: 324 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
    23.8 kmStraight-line distance
  • Oakland San Francisco Bay AirportUnited States · OAK · KOAK
    29.7 kmStraight-line distance
  • San Carlos AirportUnited States · SQL · KSQL
    45.1 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-20

Nuclear power plants

  • Vallecitos nuclear power plantUnited StatesPermanently shut downReactor units at site: 1
    23.2 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

21 Sep 2025 – 21 Sep 2026 · M ≥ 2.0 · 2,416 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

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Country statistics · United States

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