California earthquakes

M1.6 earthquake 10 km W of Cobb, California

A magnitude 1.6 earthquake struck 10 km W of Cobb, California on Tue, Nov 21, 1978, 11:42 PM PST (07:42 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.4 6 km WSW 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1978-11-22 07:42:30 UTC
Depth
0.2 km (0.1 mi), shallow
Epicenter
38.822° N, 122.839° 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
47°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 71 in the 60 days after this one and 35 in the 30 days before it.

After

  1. 2.19 km SE of Willits, California · 17479 days ago · 9 km deep · 70 km away
  2. 3.37 km NNW of Redwood Valley, California · 17479 days ago · 13 km deep · 66 km away
  3. 1.57 km WSW of Cobb, California · 17479 days ago · 4 km deep · 3 km away
  4. 1.56 km W of Cobb, California · 17479 days ago · 4 km deep · 4 km away
  5. 1.98 km W of Cobb, California · 17477 days ago · 1 km deep · 2 km away
  6. 2.28 km W of Cobb, California · 17477 days ago · 0 km deep · 2 km away
  7. 1.68 km W of Cobb, California · 17477 days ago · 0 km deep · 2 km away
  8. 1.810 km SE of Willits, California · 17475 days ago · 10 km deep · 69 km away
  9. 2.0near the coast of Northern California · 17475 days ago · 4 km deep · 52 km away
  10. 1.78 km W of Cobb, California · 17475 days ago · 1 km deep · 3 km away
  11. 2.17 km W of Cobb, California · 17473 days ago · 1 km deep · 3 km away
  12. 2.113 km ESE of Hidden Valley Lake, California · 17471 days ago · 8 km deep · 37 km away
  13. 2.610 km NNE of Brooktrails, California · 17471 days ago · 8 km deep · 89 km away
  14. 2.212 km ESE of Hidden Valley Lake, California · 17471 days ago · 10 km deep · 36 km away
  15. 1.96 km ESE of Hopland, California · 17471 days ago · 4 km deep · 23 km away
  16. 1.817 km ENE of Potter Valley, California · 17470 days ago · 5 km deep · 61 km away
  17. 2.26 km W of Cobb, California · 17469 days ago · 3 km deep · 4 km away
  18. 1.74 km WNW of Redwood Valley, California · 17469 days ago · 7 km deep · 62 km away
  19. 1.76 km NE of Rohnert Park, California · 17468 days ago · 8 km deep · 51 km away
  20. 1.76 km WSW of Cobb, California · 17467 days ago · 0 km deep · 4 km away
  21. 2.57 km W of Cobb, California · 17467 days ago · 3 km deep · 3 km away
  22. 2.57 km W of Cobb, California · 17467 days ago · 3 km deep · 3 km away
  23. 1.69 km W of Cobb, California · 17467 days ago · 0 km deep · 1 km away
  24. 2.39 km WSW of Cobb, California · 17467 days ago · 1 km deep · 2 km away
  25. 1.56 km W of Cobb, California · 17464 days ago · 3 km deep · 3 km away
  26. 2.112 km ESE of Hidden Valley Lake, California · 17464 days ago · 8 km deep · 36 km away
  27. 1.512 km ESE of Hidden Valley Lake, California · 17464 days ago · 8 km deep · 36 km away
  28. 1.811 km ESE of Willits, California · 17463 days ago · 4 km deep · 70 km away
  29. 1.64 km E of Saint Helena, California · 17463 days ago · 5 km deep · 51 km away
  30. 1.96 km W of Cobb, California · 17463 days ago · 0 km deep · 4 km away
  31. 3.46 km WSW of Cobb, California · 17463 days ago · 0 km deep · 4 km away
  32. 1.7Northern California · 17463 days ago · 18 km deep · 22 km away
  33. 2.0Northern California · 17462 days ago · 8 km deep · 36 km away
  34. 1.77 km W of Cobb, California · 17462 days ago · -1 km deep · 3 km away
  35. 2.110 km SE of Sonoma, California · 17461 days ago · 7 km deep · 78 km away
  36. 1.810 km SE of Hopland, California · 17459 days ago · 2 km deep · 19 km away
  37. 1.912 km ESE of Hidden Valley Lake, California · 17459 days ago · 8 km deep · 36 km away
  38. 3.26 km W of Cobb, California · 17457 days ago · 4 km deep · 4 km away
  39. 1.56 km W of Cobb, California · 17457 days ago · 3 km deep · 3 km away
  40. 1.611 km ESE of Willits, California · 17457 days ago · 4 km deep · 70 km away
  41. 2.33 km SE of Calpella, California · 17454 days ago · 6 km deep · 52 km away
  42. 1.75 km W of Cobb, California · 17453 days ago · 0 km deep · 4 km away
  43. 1.67 km WSW of Cobb, California · 17453 days ago · 1 km deep · 3 km away
  44. 2.411 km ESE of Hidden Valley Lake, California · 17452 days ago · 10 km deep · 36 km away
  45. 1.99 km ENE of Brooktrails, California · 17450 days ago · 9 km deep · 82 km away
  46. 2.519 km NNE of Upper Lake, California · 17449 days ago · 7 km deep · 55 km away
  47. 1.917 km SW of Hopland, California · 17449 days ago · 1 km deep · 37 km away
  48. 1.98 km WSW of Cobb, California · 17449 days ago · 1 km deep · 3 km away
  49. 1.610 km ESE of Hidden Valley Lake, California · 17447 days ago · 6 km deep · 34 km away
  50. 1.68 km WSW of Cobb, California · 17447 days ago · 1 km deep · 3 km away
  51. 2.16 km E of Willits, California · 17447 days ago · 1 km deep · 77 km away
  52. 1.67 km WSW of Cobb, California · 17445 days ago · 2 km deep · 3 km away
  53. 1.76 km W of Cobb, California · 17445 days ago · 1 km deep · 3 km away
  54. 2.010 km SSE of Willits, California · 17443 days ago · 4 km deep · 69 km away
  55. 1.95 km ESE of Black Point-Green Point, California · 17443 days ago · 5 km deep · 87 km away
  56. 1.98 km WSW of Cobb, California · 17443 days ago · 1 km deep · 2 km away
  57. 1.96 km W of Cobb, California · 17442 days ago · 3 km deep · 4 km away
  58. 2.23 km W of Deer Park, California · 17442 days ago · 8 km deep · 42 km away
  59. 2.07 km WSW of Cobb, California · 17440 days ago · 1 km deep · 4 km away
  60. 1.67 km WSW of Cobb, California · 17438 days ago · 3 km deep · 4 km away

The first 60 of 71.

Before

  1. 1.83 km SE of Calpella, California · 17482 days ago · 3 km deep · 53 km away
  2. 1.82 km SE of Calpella, California · 17482 days ago · 2 km deep · 53 km away
  3. 2.46 km WSW of Cobb, California · 17483 days ago · 3 km deep · 4 km away
  4. 2.112 km SSW of Dillon Beach, California · 17484 days ago · 2 km deep · 77 km away
  5. 1.85 km SSW of Saint Helena, California · 17485 days ago · 5 km deep · 50 km away
  6. 1.66 km W of Cobb, California · 17487 days ago · 3 km deep · 3 km away
  7. 1.65 km W of Cobb, California · 17489 days ago · 1 km deep · 4 km away
  8. 1.725 km NE of Potter Valley, California · 17489 days ago · 13 km deep · 77 km away
  9. 2.425 km NE of Potter Valley, California · 17489 days ago · 13 km deep · 77 km away
  10. 1.827 km NE of Potter Valley, California · 17490 days ago · 15 km deep · 78 km away
  11. 2.024 km NE of Potter Valley, California · 17490 days ago · 11 km deep · 75 km away
  12. 2.119 km NE of Potter Valley, California · 17490 days ago · 4 km deep · 72 km away
  13. 3.824 km NE of Potter Valley, California · 17490 days ago · 18 km deep · 76 km away
  14. 1.66 km W of Cobb, California · 17491 days ago · 3 km deep · 3 km away
  15. 1.77 km W of Cobb, California · 17491 days ago · 4 km deep · 3 km away
  16. 2.38 km WSW of Cobb, California · 17492 days ago · 4 km deep · 3 km away
  17. 2.14 km SW of Clearlake, California · 17492 days ago · 0 km deep · 20 km away
  18. 2.34 km SW of Clearlake, California · 17493 days ago · 2 km deep · 19 km away
  19. 1.57 km WSW of Cobb, California · 17494 days ago · 1 km deep · 4 km away
  20. 2.326 km NE of Potter Valley, California · 17494 days ago · 14 km deep · 78 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1043463. Read Thu, Oct 1, 2026, 7:03 AM UTC.