California earthquakes

M2.5 earthquake 8 km W of Cobb, California

A magnitude 2.5 earthquake struck 8 km W of Cobb, California on Tue, Mar 29, 1977, 11:14 AM PST (19:14 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.0 26 km N of Potter Valley, California. 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
2.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-03-29 19:14:18 UTC
Depth
-0.0 km (-0.0 mi), shallow
Epicenter
38.807° N, 122.822° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.1 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.44
Depth from
From location
Station coverage gap
46°
Stations used
26

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 45 in the 30 days before it.

After

  1. 3.026 km N of Potter Valley, California · 18080 days ago · 11 km deep · 87 km away
  2. 1.86 km W of Cobb, California · 18079 days ago · 3 km deep · 2 km away
  3. 1.66 km W of Cobb, California · 18076 days ago · 3 km deep · 2 km away
  4. 1.97 km WSW of Kenwood, California · 18074 days ago · 9 km deep · 49 km away
  5. 2.07 km WSW of Kenwood, California · 18074 days ago · 10 km deep · 49 km away
  6. 1.74 km WSW of Cobb, California · 18074 days ago · 3 km deep · 4 km away
  7. 2.37 km WSW of Cobb, California · 18073 days ago · -1 km deep · 1 km away
  8. 1.78 km WSW of Cobb, California · 18071 days ago · 3 km deep · 2 km away
  9. 2.38 km ESE of Hopland, California · 18069 days ago · 7 km deep · 23 km away
  10. 2.04 km WNW of Cobb, California · 18066 days ago · 3 km deep · 5 km away
  11. 1.53 km N of Healdsburg, California · 18064 days ago · 5 km deep · 19 km away
  12. 1.93 km ESE of Hopland, California · 18059 days ago · 5 km deep · 28 km away
  13. 2.56 km W of Cobb, California · 18057 days ago · 4 km deep · 3 km away
  14. 1.94 km WSW of Cobb, California · 18056 days ago · 2 km deep · 5 km away
  15. 1.64 km WSW of Cobb, California · 18052 days ago · 1 km deep · 4 km away
  16. 1.62 km SE of Clear Lake Riviera, California · 18051 days ago · 1 km deep · 18 km away
  17. 1.84 km WSW of Cobb, California · 18050 days ago · 1 km deep · 4 km away
  18. 1.61 km NNW of Geyserville, California · 18046 days ago · 5 km deep · 12 km away
  19. 1.68 km WSW of Cobb, California · 18037 days ago · 3 km deep · 1 km away
  20. 1.99 km S of Calistoga, California · 18027 days ago · 7 km deep · 40 km away
  21. 1.919 km NE of Upper Lake, California · 18025 days ago · 12 km deep · 56 km away
  22. 2.18 km WSW of Cobb, California · 18024 days ago · 3 km deep · 1 km away

Before

  1. 1.87 km ESE of Geyserville, California · 18084 days ago · 6 km deep · 15 km away
  2. 2.13 km ENE of Windsor, California · 18085 days ago · 5 km deep · 27 km away
  3. 1.77 km W of Cobb, California · 18085 days ago · 1 km deep · 2 km away
  4. 1.54 km WSW of Cobb, California · 18085 days ago · 1 km deep · 5 km away
  5. 2.42 km ESE of Princeton, California · 18086 days ago · 22 km deep · 97 km away
  6. 2.32 km ESE of Boonville, California · 18086 days ago · 8 km deep · 50 km away
  7. 2.95 km NNE of Penngrove, California · 18086 days ago · 7 km deep · 54 km away
  8. 3.33 km W of Moskowite Corner, California · 18087 days ago · 7 km deep · 65 km away
  9. 2.22 km ENE of Calpella, California · 18088 days ago · 5 km deep · 57 km away
  10. 1.68 km WSW of Cobb, California · 18089 days ago · 3 km deep · 1 km away
  11. 2.26 km S of Moskowite Corner, California · 18090 days ago · 12 km deep · 72 km away
  12. 2.46 km W of Cobb, California · 18090 days ago · 3 km deep · 2 km away
  13. 2.421 km NNE of Upper Lake, California · 18090 days ago · 8 km deep · 60 km away
  14. 2.06 km S of Calistoga, California · 18091 days ago · 5 km deep · 38 km away
  15. 2.18 km WSW of Cobb, California · 18091 days ago · 4 km deep · 1 km away
  16. 1.75 km WSW of Cobb, California · 18092 days ago · 4 km deep · 4 km away
  17. 1.86 km W of Cobb, California · 18093 days ago · 3 km deep · 3 km away
  18. 1.96 km W of Cobb, California · 18093 days ago · 2 km deep · 2 km away
  19. 2.40 km WSW of Larkfield-Wikiup, California · 18094 days ago · 2 km deep · 33 km away
  20. 2.721 km NNE of Upper Lake, California · 18094 days ago · 10 km deep · 58 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1034589. Read Fri, Oct 2, 2026, 10:26 PM UTC.