California earthquakes

M2.0 earthquake 4 km WNW of Cobb, California

A magnitude 2.0 earthquake struck 4 km WNW of Cobb, California on Sat, Apr 16, 1977, 2:37 PM PST (22:37 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.5 7 km W of Cobb, 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
2.0 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-04-16 22:37:09 UTC
Depth
3.1 km (2.0 mi), shallow
Epicenter
38.831° N, 122.779° 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 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
42°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 32 in the 30 days before it.

After

  1. 1.53 km N of Healdsburg, California · 18066 days ago · 5 km deep · 23 km away
  2. 1.93 km ESE of Hopland, California · 18061 days ago · 5 km deep · 29 km away
  3. 2.56 km W of Cobb, California · 18059 days ago · 4 km deep · 2 km away
  4. 1.94 km WSW of Cobb, California · 18059 days ago · 2 km deep · 3 km away
  5. 1.64 km WSW of Cobb, California · 18054 days ago · 1 km deep · 3 km away
  6. 1.62 km SE of Clear Lake Riviera, California · 18053 days ago · 1 km deep · 14 km away
  7. 1.84 km WSW of Cobb, California · 18052 days ago · 1 km deep · 3 km away
  8. 1.61 km NNW of Geyserville, California · 18048 days ago · 5 km deep · 17 km away
  9. 1.68 km WSW of Cobb, California · 18039 days ago · 3 km deep · 4 km away
  10. 1.99 km S of Calistoga, California · 18030 days ago · 7 km deep · 41 km away
  11. 1.919 km NE of Upper Lake, California · 18028 days ago · 12 km deep · 53 km away
  12. 2.18 km WSW of Cobb, California · 18027 days ago · 3 km deep · 5 km away
  13. 1.73 km NNW of Larkfield-Wikiup, California · 18026 days ago · 3 km deep · 32 km away
  14. 1.57 km W of Cobb, California · 18025 days ago · 3 km deep · 3 km away
  15. 2.25 km WSW of Moskowite Corner, California · 18025 days ago · 6 km deep · 65 km away
  16. 2.57 km W of Cobb, California · 18024 days ago · 3 km deep · 3 km away
  17. 1.87 km WSW of Cobb, California · 18021 days ago · 4 km deep · 4 km away
  18. 1.86 km W of Cobb, California · 18021 days ago · 0 km deep · 3 km away
  19. 2.18 km WSW of Cobb, California · 18020 days ago · 0 km deep · 5 km away
  20. 1.67 km WSW of Cobb, California · 18020 days ago · 3 km deep · 4 km away
  21. 1.89 km NNW of Kenwood, California · 18019 days ago · 7 km deep · 41 km away
  22. 1.616 km W of Cloverdale, California · 18018 days ago · 3 km deep · 37 km away
  23. 1.87 km W of Cobb, California · 18015 days ago · 3 km deep · 3 km away
  24. 2.57 km W of Cobb, California · 18015 days ago · 3 km deep · 3 km away
  25. 1.87 km SSW of Calistoga, California · 18014 days ago · 3 km deep · 38 km away
  26. 1.85 km WSW of Glen Ellen, California · 18014 days ago · 7 km deep · 57 km away
  27. 1.95 km WSW of Cobb, California · 18014 days ago · 1 km deep · 3 km away
  28. 2.16 km W of Cobb, California · 18014 days ago · 1 km deep · 2 km away
  29. 2.05 km SW of Glen Ellen, California · 18013 days ago · 8 km deep · 58 km away
  30. 1.85 km WSW of Cobb, California · 18011 days ago · 1 km deep · 4 km away
  31. 2.07 km SSW of Calistoga, California · 18009 days ago · 3 km deep · 38 km away

Before

  1. 2.38 km ESE of Hopland, California · 18072 days ago · 7 km deep · 25 km away
  2. 1.78 km WSW of Cobb, California · 18074 days ago · 3 km deep · 5 km away
  3. 2.37 km WSW of Cobb, California · 18075 days ago · -1 km deep · 4 km away
  4. 1.74 km WSW of Cobb, California · 18076 days ago · 3 km deep · 2 km away
  5. 2.07 km WSW of Kenwood, California · 18077 days ago · 10 km deep · 51 km away
  6. 1.97 km WSW of Kenwood, California · 18077 days ago · 9 km deep · 51 km away
  7. 1.66 km W of Cobb, California · 18079 days ago · 3 km deep · 2 km away
  8. 1.86 km W of Cobb, California · 18082 days ago · 3 km deep · 2 km away
  9. 3.026 km N of Potter Valley, California · 18082 days ago · 11 km deep · 85 km away
  10. 2.58 km W of Cobb, California · 18086 days ago · 0 km deep · 5 km away
  11. 1.87 km ESE of Geyserville, California · 18087 days ago · 6 km deep · 18 km away
  12. 2.13 km ENE of Windsor, California · 18087 days ago · 5 km deep · 30 km away
  13. 1.77 km W of Cobb, California · 18087 days ago · 1 km deep · 3 km away
  14. 1.54 km WSW of Cobb, California · 18087 days ago · 1 km deep · 3 km away
  15. 2.42 km ESE of Princeton, California · 18088 days ago · 22 km deep · 93 km away
  16. 2.32 km ESE of Boonville, California · 18088 days ago · 8 km deep · 52 km away
  17. 2.95 km NNE of Penngrove, California · 18089 days ago · 7 km deep · 56 km away
  18. 3.33 km W of Moskowite Corner, California · 18089 days ago · 7 km deep · 64 km away
  19. 2.22 km ENE of Calpella, California · 18091 days ago · 5 km deep · 57 km away
  20. 1.68 km WSW of Cobb, California · 18091 days ago · 3 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1034840. Read Mon, Oct 5, 2026, 5:23 AM UTC.