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United States · California

M1.7 Earthquake near Concord, California (United States)

UTC time: 2026-09-21 00:44:24 UTC Local time: —

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About this earthquake

A magnitude M1.7 earthquake was recorded near Concord, California (United States) on September 21, 2026 at 00:44 UTC. With a focal depth of about 15 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this small magnitude are usually barely noticeable and cause no damage.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 183 earthquakes, the strongest at M5.3.

Details

ID
e64e5a1007855f5a44bc4ea4fcbfccd0173e1859
Magnitude
M1.7
Depth
15.3 km
UTC time
2026-09-21 00:44:24 UTC
Local time
—
Country
United States
State
California
City
Concord
County
Contra Costa County
Source
usgs
Coordinates
37.96617, -122.04567
Temperature
20.3°C

Depth profile

Depth profile Depth: 15.3 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 15.3 km
Shallow
15.3 km
15.3 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: 128 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mono Lake Volcanic Field
    Distance: 264 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Mono-Inyo Craters
    Distance: 265 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mammoth Mountain
    Distance: 267 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Lassen Volcanic Center
    Distance: 285 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Soda Lakes
    Distance: 325 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
    2.8 kmStraight-line distance
  • Oakland San Francisco Bay AirportUnited States · OAK · KOAK
    31.4 kmStraight-line distance
  • San Francisco International AirportUnited States · SFO · KSFO
    48.2 kmStraight-line distance

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

Nuclear power plants

  • Vallecitos nuclear power plantUnited StatesPermanently shut downReactor units at site: 1
    43.5 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 · 2,417 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

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