California earthquakes

M1.6 earthquake 9 km WSW of Cobb, California

A magnitude 1.6 earthquake struck 9 km WSW of Cobb, California on Mon, Apr 23, 1984, 1:19 PM PST (21:19 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M1.6 6 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
1.6 (md), micro
Local time
UTC
1984-04-23 21:19:56 UTC
Depth
1.8 km (1.1 mi), shallow
Epicenter
38.802° N, 122.824° 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
±0.16
Depth from
From location
Station coverage gap
86°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 170 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.66 km W of Cobb, California · 15482 days ago · 3 km deep · 3 km away
  2. 1.66 km W of Potter Valley, California · 15482 days ago · 11 km deep · 67 km away
  3. 1.77 km W of Cobb, California · 15482 days ago · 3 km deep · 2 km away
  4. 2.213 km N of Brooktrails, California · 15481 days ago · 7 km deep · 97 km away
  5. 1.67 km WSW of Cobb, California · 15481 days ago · 3 km deep · 2 km away
  6. 1.68 km WSW of Cobb, California · 15480 days ago · 3 km deep · 1 km away
  7. 1.68 km WSW of Cobb, California · 15479 days ago · 4 km deep · 1 km away
  8. 2.87 km W of Cobb, California · 15479 days ago · 3 km deep · 3 km away
  9. 1.52 km E of Calpella, California · 15479 days ago · 4 km deep · 57 km away
  10. 2.16 km W of Cobb, California · 15479 days ago · 3 km deep · 3 km away
  11. 1.56 km W of Potter Valley, California · 15478 days ago · 8 km deep · 67 km away
  12. 2.47 km WSW of Cobb, California · 15478 days ago · 0 km deep · 1 km away
  13. 2.75 km WSW of Vacaville, California · 15478 days ago · 32 km deep · 86 km away
  14. 2.17 km W of Cobb, California · 15478 days ago · 2 km deep · 2 km away
  15. 1.67 km W of Cobb, California · 15478 days ago · 1 km deep · 2 km away
  16. 2.25 km SW of Cobb, California · 15477 days ago · 0 km deep · 5 km away
  17. 1.60 km NE of Larkfield-Wikiup, California · 15477 days ago · 3 km deep · 32 km away
  18. 1.77 km W of Cobb, California · 15476 days ago · 4 km deep · 2 km away
  19. 1.76 km SW of Cobb, California · 15476 days ago · 0 km deep · 5 km away
  20. 1.87 km W of Cobb, California · 15476 days ago · 3 km deep · 2 km away
  21. 1.56 km W of Cobb, California · 15475 days ago · 2 km deep · 4 km away
  22. 1.59 km W of Cobb, California · 15475 days ago · 2 km deep · 1 km away
  23. 1.88 km SE of Willits, California · 15475 days ago · 4 km deep · 73 km away
  24. 1.77 km WSW of Cobb, California · 15474 days ago · 3 km deep · 1 km away
  25. 2.25 km ESE of Manchester, California · 15473 days ago · 0 km deep · 72 km away
  26. 1.86 km W of Cobb, California · 15472 days ago · 3 km deep · 3 km away
  27. 1.73 km N of Clearlake, California · 15472 days ago · 0 km deep · 27 km away
  28. 1.620 km NNE of Upper Lake, California · 15472 days ago · 6 km deep · 60 km away
  29. 1.814 km SE of Laytonville, California · 15471 days ago · 0 km deep · 100 km away
  30. 1.66 km WSW of Cobb, California · 15471 days ago · 3 km deep · 3 km away
  31. 1.75 km WSW of Rutherford, California · 15470 days ago · 0 km deep · 50 km away
  32. 1.77 km WSW of Cobb, California · 15470 days ago · 3 km deep · 2 km away
  33. 1.816 km ENE of Potter Valley, California · 15470 days ago · 6 km deep · 67 km away
  34. 2.34 km SW of Cobb, California · 15469 days ago · 0 km deep · 6 km away
  35. 1.67 km W of Cobb, California · 15469 days ago · 3 km deep · 2 km away
  36. 1.96 km W of Cobb, California · 15469 days ago · 2 km deep · 2 km away
  37. 1.66 km W of Cobb, California · 15469 days ago · 3 km deep · 3 km away
  38. 1.67 km WSW of Cobb, California · 15468 days ago · 2 km deep · 1 km away
  39. 1.96 km W of Cobb, California · 15468 days ago · 3 km deep · 3 km away
  40. 2.37 km WSW of Cobb, California · 15468 days ago · 0 km deep · 2 km away
  41. 1.93 km SE of Calpella, California · 15468 days ago · 5 km deep · 55 km away
  42. 1.67 km E of Hidden Valley Lake, California · 15467 days ago · 7 km deep · 31 km away
  43. 1.77 km WSW of Cobb, California · 15467 days ago · 0 km deep · 2 km away
  44. 1.8Northern California · 15467 days ago · 4 km deep · 25 km away
  45. 3.05 km SW of Cobb, California · 15467 days ago · 0 km deep · 6 km away
  46. 1.96 km W of Cobb, California · 15466 days ago · 3 km deep · 3 km away
  47. 1.525 km SE of Covelo, California · 15466 days ago · 4 km deep · 93 km away
  48. 1.6Northern California · 15465 days ago · 0 km deep · 35 km away
  49. 1.87 km S of Calistoga, California · 15465 days ago · 1 km deep · 39 km away
  50. 2.56 km W of Cobb, California · 15464 days ago · 2 km deep · 3 km away
  51. 2.16 km W of Cobb, California · 15464 days ago · 2 km deep · 3 km away
  52. 1.67 km WSW of Cobb, California · 15464 days ago · 4 km deep · 1 km away
  53. 1.57 km WSW of Cobb, California · 15464 days ago · 3 km deep · 2 km away
  54. 1.75 km ESE of Healdsburg, California · 15464 days ago · 4 km deep · 23 km away
  55. 2.47 km WSW of Cobb, California · 15464 days ago · 1 km deep · 2 km away
  56. 1.712 km S of Comptche, California · 15463 days ago · 3 km deep · 78 km away
  57. 2.112 km S of Comptche, California · 15463 days ago · 0 km deep · 77 km away
  58. 1.55 km N of Windsor, California · 15463 days ago · 7 km deep · 23 km away
  59. 2.47 km WSW of Cobb, California · 15463 days ago · -1 km deep · 2 km away
  60. 2.37 km W of Cobb, California · 15462 days ago · 2 km deep · 1 km away

The first 60 of 170.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc16272. Read Tue, Sep 22, 2026, 8:55 PM UTC.