California earthquakes

M0.5 earthquake 5 km WNW of Cobb, CA

A magnitude 0.5 earthquake struck 5 km WNW of Cobb, CA on Sun, Sep 20, 2026, 6:40 PM PDT (01:40 UTC), 1 km (1 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M1.7 3 km ENE of San Rafael, CA. This one was a foreshock.

Cobb forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
0.5 (md), micro
Local time
UTC
2026-09-21 01:40:10 UTC
Depth
1.2 km (0.8 mi), shallow
Epicenter
38.832° N, 122.785° W
Tsunami flag
No
Status
Automatic solution, may be revised

Did you feel it?

No one has reported feeling this quake to the USGS. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

An automatic solution; a seismologist may revise it.

Location uncertainty
About 0.6 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.34
Depth from
From location
Station coverage gap
134°
Stations used
7

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 2 since this one and 117 in the 30 days before it.

After

  1. 1.73 km ENE of San Rafael, CA · 27 hr ago · 11 km deep · 98 km away
  2. 2.15 km WNW of The Geysers, CA · 19 hr ago · 2 km deep · 4 km away · felt by 3

Before

  1. 1.78 km ESE of Cloverdale, CA · 35 hr ago · 7 km deep · 14 km away
  2. 1.87 km NW of The Geysers, CA · 36 hr ago · 2 km deep · 3 km away
  3. 2.19 km WNW of The Geysers, CA · 40 hr ago · 2 km deep · 6 km away
  4. 1.78 km ESE of Cloverdale, CA · 3 days ago · 5 km deep · 14 km away
  5. 1.87 km WNW of Cobb, CA · 3 days ago · 2 km deep · 1 km away
  6. 1.914 km S of Willits, CA · 3 days ago · 0 km deep · 72 km away
  7. 1.87 km W of Saint Helena, CA · 4 days ago · 9 km deep · 43 km away
  8. 1.54 km W of Cobb, CA · 4 days ago · 2 km deep · 2 km away
  9. 1.88 km W of Saint Helena, CA · 4 days ago · 8 km deep · 42 km away
  10. 1.711 km W of Lake Pillsbury, CA · 5 days ago · -1 km deep · 67 km away
  11. 1.93 km ENE of The Geysers, CA · 5 days ago · 1 km deep · 7 km away
  12. 1.94 km ESE of Santa Rosa, CA · 6 days ago · 8 km deep · 45 km away
  13. 1.68 km NW of The Geysers, CA · 6 days ago · 2 km deep · 3 km away
  14. 1.63 km W of Anderson Springs, CA · 6 days ago · 2 km deep · 9 km away
  15. 1.64 km ESE of Santa Rosa, CA · 6 days ago · 8 km deep · 45 km away
  16. 2.73 km ESE of Santa Rosa, CA · 6 days ago · 9 km deep · 45 km away · felt by 171
  17. 1.78 km ESE of Cloverdale, CA · 6 days ago · 5 km deep · 15 km away
  18. 1.77 km W of Cobb, CA · 7 days ago · 2 km deep · 2 km away
  19. 1.65 km ESE of Boonville, CA · 7 days ago · 3 km deep · 49 km away
  20. 1.61 km ESE of The Geysers, CA · 7 days ago · 2 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc75439232. Read Tue, Sep 22, 2026, 8:47 AM UTC.