California earthquakes

M2.1 earthquake 7 km W of Cobb, California

A magnitude 2.1 earthquake struck 7 km W of Cobb, California on Tue, Nov 28, 1978, 12:15 PM PST (20:15 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.1 13 km ESE of Hidden Valley Lake, 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
1978-11-28 20:15:08 UTC
Depth
1.0 km (0.6 mi), shallow
Epicenter
38.822° 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, 0.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
54°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 68 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 2.113 km ESE of Hidden Valley Lake, California · 17463 days ago · 8 km deep · 35 km away
  2. 2.610 km NNE of Brooktrails, California · 17463 days ago · 8 km deep · 90 km away
  3. 2.212 km ESE of Hidden Valley Lake, California · 17463 days ago · 10 km deep · 33 km away
  4. 1.96 km ESE of Hopland, California · 17462 days ago · 4 km deep · 25 km away
  5. 1.817 km ENE of Potter Valley, California · 17462 days ago · 5 km deep · 61 km away
  6. 2.26 km W of Cobb, California · 17461 days ago · 3 km deep · 1 km away
  7. 1.74 km WNW of Redwood Valley, California · 17461 days ago · 7 km deep · 64 km away
  8. 1.76 km NE of Rohnert Park, California · 17460 days ago · 8 km deep · 50 km away
  9. 1.76 km WSW of Cobb, California · 17459 days ago · 0 km deep · 2 km away
  10. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 1 km away
  11. 2.57 km W of Cobb, California · 17459 days ago · 3 km deep · 1 km away
  12. 1.69 km W of Cobb, California · 17459 days ago · 0 km deep · 2 km away
  13. 2.39 km WSW of Cobb, California · 17458 days ago · 1 km deep · 3 km away
  14. 1.56 km W of Cobb, California · 17456 days ago · 3 km deep · 1 km away
  15. 2.112 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 33 km away
  16. 1.512 km ESE of Hidden Valley Lake, California · 17455 days ago · 8 km deep · 33 km away
  17. 1.811 km ESE of Willits, California · 17455 days ago · 4 km deep · 71 km away
  18. 1.64 km E of Saint Helena, California · 17455 days ago · 5 km deep · 49 km away
  19. 1.96 km W of Cobb, California · 17455 days ago · 0 km deep · 1 km away
  20. 3.46 km WSW of Cobb, California · 17454 days ago · 0 km deep · 2 km away
  21. 1.7Northern California · 17454 days ago · 18 km deep · 20 km away
  22. 2.0Northern California · 17454 days ago · 8 km deep · 33 km away
  23. 1.77 km W of Cobb, California · 17454 days ago · -1 km deep · 0 km away
  24. 2.110 km SE of Sonoma, California · 17452 days ago · 7 km deep · 77 km away
  25. 1.810 km SE of Hopland, California · 17451 days ago · 2 km deep · 21 km away
  26. 1.912 km ESE of Hidden Valley Lake, California · 17450 days ago · 8 km deep · 33 km away
  27. 3.26 km W of Cobb, California · 17449 days ago · 4 km deep · 1 km away
  28. 1.56 km W of Cobb, California · 17449 days ago · 3 km deep · 1 km away
  29. 1.611 km ESE of Willits, California · 17448 days ago · 4 km deep · 71 km away
  30. 2.33 km SE of Calpella, California · 17446 days ago · 6 km deep · 54 km away
  31. 1.75 km W of Cobb, California · 17445 days ago · 0 km deep · 2 km away
  32. 1.67 km WSW of Cobb, California · 17444 days ago · 1 km deep · 2 km away
  33. 2.411 km ESE of Hidden Valley Lake, California · 17444 days ago · 10 km deep · 33 km away
  34. 1.99 km ENE of Brooktrails, California · 17442 days ago · 9 km deep · 84 km away
  35. 2.519 km NNE of Upper Lake, California · 17441 days ago · 7 km deep · 55 km away
  36. 1.917 km SW of Hopland, California · 17441 days ago · 1 km deep · 40 km away
  37. 1.98 km WSW of Cobb, California · 17441 days ago · 1 km deep · 2 km away
  38. 1.610 km ESE of Hidden Valley Lake, California · 17439 days ago · 6 km deep · 31 km away
  39. 1.68 km WSW of Cobb, California · 17439 days ago · 1 km deep · 2 km away
  40. 2.16 km E of Willits, California · 17438 days ago · 1 km deep · 78 km away
  41. 1.67 km WSW of Cobb, California · 17437 days ago · 2 km deep · 2 km away
  42. 1.76 km W of Cobb, California · 17437 days ago · 1 km deep · 0 km away
  43. 2.010 km SSE of Willits, California · 17435 days ago · 4 km deep · 70 km away
  44. 1.95 km ESE of Black Point-Green Point, California · 17435 days ago · 5 km deep · 86 km away
  45. 1.98 km WSW of Cobb, California · 17434 days ago · 1 km deep · 2 km away
  46. 1.96 km W of Cobb, California · 17434 days ago · 3 km deep · 1 km away
  47. 2.23 km W of Deer Park, California · 17434 days ago · 8 km deep · 41 km away
  48. 2.07 km WSW of Cobb, California · 17431 days ago · 1 km deep · 2 km away
  49. 1.67 km WSW of Cobb, California · 17429 days ago · 3 km deep · 3 km away
  50. 1.51 km WSW of Moskowite Corner, California · 17429 days ago · 12 km deep · 67 km away
  51. 1.927 km SE of Covelo, California · 17425 days ago · 0 km deep · 89 km away
  52. 1.67 km W of Healdsburg, California · 17425 days ago · 1 km deep · 26 km away
  53. 2.45 km E of Black Point-Green Point, California · 17423 days ago · 12 km deep · 84 km away
  54. 1.66 km W of Cobb, California · 17422 days ago · 4 km deep · 1 km away
  55. 1.87 km W of Cobb, California · 17420 days ago · 3 km deep · 0 km away
  56. 1.76 km W of Cobb, California · 17420 days ago · 4 km deep · 1 km away
  57. 2.52 km SSW of Monument Hills, California · 17415 days ago · 10 km deep · 82 km away
  58. 2.76 km W of Cobb, California · 17414 days ago · 0 km deep · 1 km away
  59. 1.76 km W of Cobb, California · 17414 days ago · 0 km deep · 1 km away
  60. 1.58 km WSW of Cobb, California · 17413 days ago · 1 km deep · 2 km away

The first 60 of 68.

Before

  1. 1.78 km W of Cobb, California · 17466 days ago · 1 km deep · 1 km away
  2. 2.0near the coast of Northern California · 17467 days ago · 4 km deep · 54 km away
  3. 1.810 km SE of Willits, California · 17467 days ago · 10 km deep · 71 km away
  4. 1.68 km W of Cobb, California · 17469 days ago · 0 km deep · 1 km away
  5. 2.28 km W of Cobb, California · 17469 days ago · 0 km deep · 1 km away
  6. 1.98 km W of Cobb, California · 17469 days ago · 1 km deep · 1 km away
  7. 1.56 km W of Cobb, California · 17470 days ago · 4 km deep · 1 km away
  8. 1.57 km WSW of Cobb, California · 17471 days ago · 4 km deep · 2 km away
  9. 3.37 km NNW of Redwood Valley, California · 17471 days ago · 13 km deep · 68 km away
  10. 2.19 km SE of Willits, California · 17471 days ago · 9 km deep · 72 km away
  11. 1.610 km W of Cobb, California · 17472 days ago · 0 km deep · 3 km away
  12. 1.83 km SE of Calpella, California · 17473 days ago · 3 km deep · 54 km away
  13. 1.82 km SE of Calpella, California · 17473 days ago · 2 km deep · 54 km away
  14. 2.46 km WSW of Cobb, California · 17474 days ago · 3 km deep · 2 km away
  15. 2.112 km SSW of Dillon Beach, California · 17475 days ago · 2 km deep · 77 km away
  16. 1.85 km SSW of Saint Helena, California · 17476 days ago · 5 km deep · 49 km away
  17. 1.66 km W of Cobb, California · 17479 days ago · 3 km deep · 0 km away
  18. 1.65 km W of Cobb, California · 17480 days ago · 1 km deep · 1 km away
  19. 1.725 km NE of Potter Valley, California · 17481 days ago · 13 km deep · 77 km away
  20. 2.425 km NE of Potter Valley, California · 17481 days ago · 13 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1043540. Read Tue, Sep 22, 2026, 10:35 PM UTC.