California earthquakes

M1.8 earthquake 5 km W of Cobb, California

A magnitude 1.8 earthquake struck 5 km W of Cobb, California on Thu, May 31, 1984, 5:01 AM PDT (12:01 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.2 7 km SW 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-05-31 12:01:35 UTC
Depth
1.3 km (0.8 mi), shallow
Epicenter
38.817° N, 122.782° 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 0.3 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
76°
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 100 in the 30 days before it.

After

  1. 1.66 km W of Cobb, California · 15463 days ago · 3 km deep · 1 km away
  2. 1.65 km W of Cobb, California · 15462 days ago · 0 km deep · 2 km away
  3. 1.55 km W of Cobb, California · 15462 days ago · 0 km deep · 1 km away
  4. 1.8Northern California · 15462 days ago · 1 km deep · 1 km away
  5. 2.025 km SE of Covelo, California · 15462 days ago · 4 km deep · 92 km away
  6. 1.96 km E of Hidden Valley Lake, California · 15462 days ago · 7 km deep · 26 km away
  7. 1.85 km WSW of Cobb, California · 15462 days ago · 1 km deep · 1 km away
  8. 1.66 km W of Cobb, California · 15462 days ago · 3 km deep · 1 km away
  9. 1.84 km WSW of Cobb, California · 15462 days ago · 1 km deep · 2 km away
  10. 1.77 km W of Cobb, California · 15462 days ago · 3 km deep · 2 km away
  11. 1.619 km ENE of Clearlake, California · 15461 days ago · 5 km deep · 39 km away
  12. 1.92 km SSW of Dixon, California · 15461 days ago · 23 km deep · 93 km away
  13. 2.713 km N of Upper Lake, California · 15461 days ago · 0 km deep · 53 km away
  14. 1.66 km W of Cobb, California · 15460 days ago · 3 km deep · 1 km away
  15. 1.812 km NE of Comptche, California · 15460 days ago · -1 km deep · 83 km away
  16. 3.08 km SSW of Suisun, California · 15460 days ago · 5 km deep · 96 km away
  17. 2.29 km SSW of Suisun, California · 15460 days ago · 5 km deep · 95 km away
  18. 1.67 km WSW of Cobb, California · 15460 days ago · 2 km deep · 3 km away
  19. 2.33 km WNW of Soda Bay, California · 15459 days ago · 5 km deep · 22 km away
  20. 1.84 km NW of Soda Bay, California · 15459 days ago · 5 km deep · 23 km away
  21. 1.57 km W of Cobb, California · 15457 days ago · 3 km deep · 2 km away
  22. 1.63 km WNW of Cobb, California · 15456 days ago · -1 km deep · 2 km away
  23. 1.65 km WSW of Cobb, California · 15456 days ago · 1 km deep · 1 km away
  24. 1.511 km SSW of Kelseyville, California · 15456 days ago · 19 km deep · 10 km away
  25. 1.93 km WNW of Clearlake Oaks, California · 15455 days ago · 19 km deep · 26 km away
  26. 1.629 km SE of Covelo, California · 15455 days ago · 7 km deep · 90 km away
  27. 2.06 km W of Cobb, California · 15455 days ago · 3 km deep · 1 km away
  28. 1.87 km W of Cobb, California · 15454 days ago · 1 km deep · 2 km away
  29. 2.37 km WSW of Cobb, California · 15454 days ago · 0 km deep · 3 km away
  30. 1.67 km WSW of Cobb, California · 15453 days ago · 3 km deep · 3 km away
  31. 1.77 km W of Cobb, California · 15453 days ago · 3 km deep · 2 km away
  32. 1.723 km NNE of Potter Valley, California · 15453 days ago · 9 km deep · 80 km away
  33. 2.2Northern California · 15453 days ago · 1 km deep · 3 km away
  34. 1.8Northern California · 15452 days ago · -1 km deep · 27 km away
  35. 2.07 km W of Cobb, California · 15452 days ago · 3 km deep · 2 km away
  36. 3.26 km W of Cobb, California · 15452 days ago · 2 km deep · 2 km away
  37. 1.96 km W of Cobb, California · 15452 days ago · 3 km deep · 1 km away
  38. 1.74 km SE of Clear Lake Riviera, California · 15452 days ago · 2 km deep · 15 km away
  39. 1.68 km WSW of Cobb, California · 15451 days ago · 3 km deep · 3 km away
  40. 1.93 km N of Larkfield-Wikiup, California · 15450 days ago · 4 km deep · 30 km away
  41. 1.65 km NNE of Clearlake, California · 15450 days ago · -1 km deep · 26 km away
  42. 2.123 km NNE of Potter Valley, California · 15449 days ago · 10 km deep · 79 km away
  43. 2.14 km NE of Talmage, California · 15449 days ago · 7 km deep · 49 km away
  44. 1.66 km WSW of Cobb, California · 15449 days ago · 3 km deep · 2 km away
  45. 1.86 km WSW of Cobb, California · 15448 days ago · 3 km deep · 1 km away
  46. 2.26 km WSW of Cobb, California · 15448 days ago · 3 km deep · 1 km away
  47. 2.56 km WSW of Cobb, California · 15448 days ago · -1 km deep · 2 km away
  48. 2.55 km WSW of Cobb, California · 15447 days ago · 0 km deep · 2 km away
  49. 3.06 km W of Cobb, California · 15447 days ago · 3 km deep · 2 km away
  50. 2.55 km SW of Cobb, California · 15447 days ago · 0 km deep · 3 km away
  51. 1.88 km WSW of Cobb, California · 15447 days ago · 3 km deep · 3 km away
  52. 1.68 km WSW of Cobb, California · 15447 days ago · 3 km deep · 3 km away
  53. 3.16 km W of Cobb, California · 15447 days ago · 3 km deep · 2 km away
  54. 2.321 km NNE of Potter Valley, California · 15447 days ago · 3 km deep · 77 km away
  55. 2.422 km NNE of Potter Valley, California · 15447 days ago · -1 km deep · 77 km away
  56. 1.87 km WSW of Cobb, California · 15447 days ago · 1 km deep · 3 km away
  57. 1.87 km WSW of Cobb, California · 15446 days ago · 2 km deep · 3 km away
  58. 2.47 km WSW of Cobb, California · 15446 days ago · 2 km deep · 3 km away
  59. 1.95 km SW of Cobb, California · 15446 days ago · 0 km deep · 3 km away
  60. 2.34 km SE of Larkfield-Wikiup, California · 15446 days ago · 3 km deep · 38 km away

The first 60 of 172.

Before

  1. 1.86 km W of Cobb, California · 15463 days ago · 2 km deep · 1 km away
  2. 1.517 km N of Potter Valley, California · 15463 days ago · 8 km deep · 79 km away
  3. 1.65 km SW of Moskowite Corner, California · 15464 days ago · 11 km deep · 66 km away
  4. 1.83 km W of Cobb, California · 15464 days ago · -1 km deep · 1 km away
  5. 1.517 km NE of Potter Valley, California · 15464 days ago · 3 km deep · 72 km away
  6. 1.521 km NE of Potter Valley, California · 15464 days ago · 4 km deep · 75 km away
  7. 2.15 km SW of Cobb, California · 15465 days ago · 1 km deep · 3 km away
  8. 2.14 km NE of Willits, California · 15465 days ago · 1 km deep · 83 km away
  9. 1.77 km WSW of Cobb, California · 15465 days ago · 4 km deep · 3 km away
  10. 3.17 km WSW of Cobb, California · 15466 days ago · 1 km deep · 2 km away
  11. 2.67 km WSW of Cobb, California · 15466 days ago · 3 km deep · 3 km away
  12. 3.08 km W of Cobb, California · 15466 days ago · -1 km deep · 4 km away
  13. 2.28 km SW of Cobb, California · 15466 days ago · -1 km deep · 5 km away
  14. 1.68 km W of Cobb, California · 15467 days ago · -1 km deep · 3 km away
  15. 1.76 km W of Cobb, California · 15467 days ago · 3 km deep · 2 km away
  16. 1.57 km W of Potter Valley, California · 15467 days ago · 8 km deep · 68 km away
  17. 1.73 km SW of Cobb, California · 15467 days ago · 1 km deep · 4 km away
  18. 1.92 km WSW of Cobb, California · 15467 days ago · -1 km deep · 2 km away
  19. 1.616 km ENE of Potter Valley, California · 15467 days ago · 7 km deep · 66 km away
  20. 1.65 km WSW of Cobb, California · 15467 days ago · 1 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc19792. Read Thu, Oct 1, 2026, 12:46 PM UTC.