California earthquakes

M2.1 earthquake 7 km W of Cobb, California

A magnitude 2.1 earthquake struck 7 km W of Cobb, California on Sat, Mar 17, 1979, 1:18 PM PST (21:18 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.1 3 km ESE of Calpella, 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
2.1 (md), micro
Local time
UTC
1979-03-17 21:18:26 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
38.815° N, 122.808° 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, 0.4 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
52°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 61 in the 60 days after this one and 32 in the 30 days before it.

After

  1. 2.13 km ESE of Calpella, California · 17356 days ago · 6 km deep · 55 km away
  2. 1.813 km E of Hidden Valley Lake, California · 17355 days ago · 8 km deep · 35 km away
  3. 2.16 km WSW of Cobb, California · 17354 days ago · 1 km deep · 1 km away
  4. 2.86 km W of Cobb, California · 17354 days ago · 3 km deep · 1 km away
  5. 2.015 km NNE of Angwin, California · 17352 days ago · 11 km deep · 39 km away
  6. 1.614 km NNE of Angwin, California · 17352 days ago · 4 km deep · 39 km away
  7. 1.99 km SSE of Hopland, California · 17352 days ago · 5 km deep · 25 km away
  8. 1.74 km WSW of Cobb, California · 17352 days ago · 1 km deep · 4 km away
  9. 1.96 km N of Cloverdale, California · 17351 days ago · 6 km deep · 19 km away
  10. 2.06 km N of Cloverdale, California · 17351 days ago · 5 km deep · 19 km away
  11. 2.2Northern California · 17351 days ago · -1 km deep · 58 km away
  12. 1.916 km WSW of Guinda, California · 17351 days ago · 5 km deep · 39 km away
  13. 1.65 km ESE of Clearlake Oaks, California · 17349 days ago · 2 km deep · 28 km away
  14. 2.16 km W of Cobb, California · 17349 days ago · 4 km deep · 2 km away
  15. 1.85 km SE of Santa Rosa, California · 17349 days ago · 10 km deep · 46 km away
  16. 1.98 km NNE of Hopland, California · 17348 days ago · 2 km deep · 35 km away
  17. 1.88 km NNE of Hopland, California · 17348 days ago · 0 km deep · 35 km away
  18. 2.319 km NE of Upper Lake, California · 17348 days ago · 8 km deep · 55 km away
  19. 1.86 km ENE of Brooktrails, California · 17347 days ago · 4 km deep · 84 km away
  20. 1.70 km NNE of Larkfield-Wikiup, California · 17345 days ago · 4 km deep · 33 km away
  21. 1.58 km WSW of Cobb, California · 17345 days ago · 4 km deep · 2 km away
  22. 1.69 km E of Willits, California · 17344 days ago · 4 km deep · 75 km away
  23. 1.65 km ENE of Lucerne, California · 17343 days ago · 8 km deep · 33 km away
  24. 1.53 km ESE of Calpella, California · 17341 days ago · 5 km deep · 54 km away
  25. 1.75 km NE of Nice, California · 17341 days ago · 9 km deep · 39 km away
  26. 2.13 km ESE of Calpella, California · 17340 days ago · 6 km deep · 55 km away
  27. 2.17 km SSE of Potter Valley, California · 17340 days ago · 41 km deep · 55 km away
  28. 1.53 km ESE of Calpella, California · 17340 days ago · 6 km deep · 55 km away
  29. 1.65 km SSW of Woodland, California · 17339 days ago · 6 km deep · 89 km away
  30. 1.710 km NNW of Potter Valley, California · 17339 days ago · 4 km deep · 73 km away
  31. 1.912 km NNW of Potter Valley, California · 17339 days ago · 12 km deep · 75 km away
  32. 1.64 km SSE of Hopland, California · 17339 days ago · 7 km deep · 29 km away
  33. 2.03 km ESE of Talmage, California · 17339 days ago · 3 km deep · 44 km away
  34. 1.95 km WSW of Cobb, California · 17338 days ago · 0 km deep · 2 km away
  35. 1.55 km WSW of Cobb, California · 17338 days ago · 0 km deep · 2 km away
  36. 2.46 km ENE of Vallejo, California · 17333 days ago · 0 km deep · 95 km away
  37. 1.66 km WSW of Cobb, California · 17330 days ago · 0 km deep · 2 km away
  38. 2.68 km WSW of Cobb, California · 17327 days ago · 4 km deep · 2 km away
  39. 1.58 km WSW of Cobb, California · 17327 days ago · 4 km deep · 2 km away
  40. 1.95 km ESE of Clearlake Oaks, California · 17327 days ago · 2 km deep · 28 km away
  41. 2.06 km WSW of Cobb, California · 17327 days ago · 4 km deep · 1 km away
  42. 1.710 km NW of Moskowite Corner, California · 17326 days ago · 5 km deep · 57 km away
  43. 1.84 km ENE of Saint Helena, California · 17326 days ago · 10 km deep · 47 km away
  44. 2.57 km WSW of Cobb, California · 17323 days ago · 3 km deep · 1 km away
  45. 1.910 km NNW of Potter Valley, California · 17321 days ago · 4 km deep · 73 km away
  46. 1.610 km SE of Boonville, California · 17318 days ago · 1 km deep · 45 km away
  47. 2.16 km WSW of Calistoga, California · 17317 days ago · 5 km deep · 32 km away
  48. 2.10 km N of Hopland, California · 17316 days ago · 7 km deep · 32 km away
  49. 2.46 km W of Cobb, California · 17314 days ago · 1 km deep · 1 km away
  50. 1.99 km W of Cobb, California · 17311 days ago · 1 km deep · 2 km away
  51. 2.411 km E of Comptche, California · 17311 days ago · 13 km deep · 76 km away
  52. 1.714 km NNW of Potter Valley, California · 17311 days ago · 4 km deep · 77 km away
  53. 3.06 km W of Cobb, California · 17311 days ago · 1 km deep · 2 km away
  54. 1.56 km WSW of Cobb, California · 17307 days ago · 1 km deep · 1 km away
  55. 1.94 km WSW of Guinda, California · 17306 days ago · 43 km deep · 49 km away
  56. 1.610 km E of Hidden Valley Lake, California · 17303 days ago · 10 km deep · 32 km away
  57. 1.64 km WSW of Cobb, California · 17301 days ago · 1 km deep · 3 km away
  58. 1.65 km WSW of Cobb, California · 17301 days ago · 0 km deep · 2 km away
  59. 2.22 km NNE of Deer Park, California · 17301 days ago · 11 km deep · 42 km away
  60. 2.33 km WSW of Cobb, California · 17299 days ago · 2 km deep · 4 km away

The first 60 of 61.

Before

  1. 2.110 km NNE of Brooktrails, California · 17356 days ago · 8 km deep · 91 km away
  2. 2.04 km WSW of Cobb, California · 17357 days ago · 4 km deep · 3 km away
  3. 1.916 km E of Potter Valley, California · 17357 days ago · 2 km deep · 59 km away
  4. 2.315 km E of Angwin, California · 17358 days ago · 2 km deep · 53 km away
  5. 1.55 km SSE of Moskowite Corner, California · 17359 days ago · 5 km deep · 72 km away
  6. 2.38 km ENE of Lower Lake, California · 17360 days ago · 9 km deep · 29 km away
  7. 2.14 km WSW of Cobb, California · 17360 days ago · 1 km deep · 4 km away
  8. 1.711 km E of Lower Lake, California · 17360 days ago · 15 km deep · 31 km away
  9. 2.617 km NNE of Nice, California · 17362 days ago · 4 km deep · 49 km away
  10. 2.816 km NNE of Nice, California · 17363 days ago · 7 km deep · 49 km away
  11. 2.68 km WSW of Cobb, California · 17364 days ago · 3 km deep · 2 km away
  12. 1.86 km WSW of Cobb, California · 17364 days ago · 1 km deep · 2 km away
  13. 2.323 km NE of Potter Valley, California · 17365 days ago · 10 km deep · 76 km away
  14. 2.07 km NNW of Redwood Valley, California · 17365 days ago · 7 km deep · 68 km away
  15. 3.213 km WNW of Brooktrails, California · 17366 days ago · 22 km deep · 98 km away
  16. 2.42 km ESE of Calpella, California · 17366 days ago · 6 km deep · 55 km away
  17. 1.87 km W of Cobb, California · 17368 days ago · 0 km deep · 1 km away
  18. 2.32 km SSW of Monument Hills, California · 17369 days ago · 9 km deep · 82 km away
  19. 2.06 km ESE of Willits, California · 17369 days ago · 10 km deep · 76 km away
  20. 2.37 km W of Cobb, California · 17370 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1045034. Read Tue, Sep 22, 2026, 8:57 PM UTC.