California earthquakes

M1.6 earthquake 9 km WSW of Cobb, California

A magnitude 1.6 earthquake struck 9 km WSW of Cobb, California on Wed, Aug 31, 1983, 3:56 PM PDT (22:56 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.5 9 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-08-31 22:56:49 UTC
Depth
1.7 km (1.0 mi), shallow
Epicenter
38.801° N, 122.825° 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, 0.9 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
85°
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: 177 in the 60 days after this one and 81 in the 30 days before it.

After

  1. 1.65 km SSW of Cobb, California · 15737 days ago · -1 km deep · 8 km away
  2. 1.7Northern California · 15737 days ago · 13 km deep · 85 km away
  3. 1.69 km SW of Clear Lake Riviera, California · 15736 days ago · 9 km deep · 10 km away
  4. 1.610 km SSW of Comptche, California · 15736 days ago · 3 km deep · 80 km away
  5. 1.88 km W of Cobb, California · 15736 days ago · 0 km deep · 1 km away
  6. 1.57 km W of Cobb, California · 15735 days ago · 3 km deep · 3 km away
  7. 2.01 km ENE of Middletown, California · 15735 days ago · 55 km deep · 20 km away
  8. 1.58 km WSW of Cobb, California · 15735 days ago · 1 km deep · 0 km away
  9. 1.56 km W of Cobb, California · 15734 days ago · 3 km deep · 3 km away
  10. 1.56 km W of Cobb, California · 15734 days ago · 3 km deep · 3 km away
  11. 2.16 km W of Cobb, California · 15733 days ago · 3 km deep · 3 km away
  12. 1.78 km W of Cobb, California · 15733 days ago · 0 km deep · 1 km away
  13. 1.65 km SW of Cobb, California · 15732 days ago · 0 km deep · 5 km away
  14. 1.75 km SW of Cobb, California · 15732 days ago · 0 km deep · 4 km away
  15. 1.710 km NNE of Cloverdale, California · 15732 days ago · 12 km deep · 18 km away
  16. 1.78 km WSW of Cobb, California · 15732 days ago · 3 km deep · 2 km away
  17. 2.69 km WSW of Cobb, California · 15732 days ago · 1 km deep · 1 km away
  18. 1.67 km SSE of Cobb, California · 15731 days ago · -1 km deep · 12 km away
  19. 1.98 km WSW of Cobb, California · 15731 days ago · 1 km deep · 1 km away
  20. 2.133 km SW of Point Arena, California · 15731 days ago · 47 km deep · 98 km away
  21. 2.66 km W of Cobb, California · 15730 days ago · 3 km deep · 3 km away
  22. 1.87 km W of Cobb, California · 15729 days ago · 0 km deep · 3 km away
  23. 1.76 km W of Cobb, California · 15729 days ago · 3 km deep · 3 km away
  24. 2.06 km W of Cobb, California · 15729 days ago · 3 km deep · 3 km away
  25. 2.06 km SE of College City, California · 15728 days ago · 1 km deep · 78 km away
  26. 2.18 km WSW of Cobb, California · 15728 days ago · -1 km deep · 1 km away
  27. 2.57 km NNE of Dunnigan, California · 15728 days ago · 2 km deep · 78 km away
  28. 2.63 km WNW of Dunnigan, California · 15728 days ago · 11 km deep · 71 km away
  29. 2.35 km SW of Cobb, California · 15728 days ago · 0 km deep · 5 km away
  30. 1.89 km S of Moskowite Corner, California · 15727 days ago · 7 km deep · 74 km away
  31. 1.510 km ESE of Hidden Valley Lake, California · 15726 days ago · 6 km deep · 33 km away
  32. 1.58 km NNW of Redwood Valley, California · 15726 days ago · 8 km deep · 70 km away
  33. 1.86 km S of Cobb, California · 15726 days ago · 0 km deep · 11 km away
  34. 1.615 km ESE of Comptche, California · 15725 days ago · -1 km deep · 70 km away
  35. 1.69 km WSW of Cobb, California · 15725 days ago · 2 km deep · 0 km away
  36. 1.96 km WSW of Cobb, California · 15723 days ago · -1 km deep · 3 km away
  37. 1.74 km W of Cobb, California · 15722 days ago · 4 km deep · 5 km away
  38. 1.66 km S of Cobb, California · 15722 days ago · -1 km deep · 11 km away
  39. 1.87 km W of Cobb, California · 15721 days ago · 3 km deep · 2 km away
  40. 1.615 km NE of Clearlake, California · 15721 days ago · 2 km deep · 40 km away
  41. 2.06 km W of Cobb, California · 15721 days ago · 7 km deep · 3 km away
  42. 2.014 km N of Upper Lake, California · 15721 days ago · 15 km deep · 55 km away
  43. 1.611 km NNE of Cloverdale, California · 15721 days ago · 4 km deep · 17 km away
  44. 2.16 km WSW of Cobb, California · 15721 days ago · 0 km deep · 3 km away
  45. 1.96 km WSW of Cobb, California · 15721 days ago · 0 km deep · 3 km away
  46. 2.06 km WSW of Cobb, California · 15721 days ago · 3 km deep · 2 km away
  47. 1.85 km SW of Cobb, California · 15720 days ago · 0 km deep · 4 km away
  48. 2.311 km ESE of Hidden Valley Lake, California · 15720 days ago · 4 km deep · 34 km away
  49. 1.55 km ENE of Willits, California · 15720 days ago · 5 km deep · 81 km away
  50. 2.04 km ESE of Vallejo, California · 15720 days ago · 5 km deep · 95 km away
  51. 2.417 km N of Upper Lake, California · 15720 days ago · 6 km deep · 58 km away
  52. 2.5Northern California · 15719 days ago · 1 km deep · 2 km away
  53. 1.65 km W of Cobb, California · 15718 days ago · 1 km deep · 4 km away
  54. 2.16 km W of Cobb, California · 15718 days ago · -1 km deep · 4 km away
  55. 1.59 km SW of Clear Lake Riviera, California · 15718 days ago · -1 km deep · 10 km away
  56. 1.813 km ESE of Hidden Valley Lake, California · 15718 days ago · -1 km deep · 36 km away
  57. 1.914 km SW of Cloverdale, California · 15718 days ago · 3 km deep · 28 km away
  58. 1.97 km W of Cobb, California · 15717 days ago · 0 km deep · 3 km away
  59. 2.68 km W of Cobb, California · 15717 days ago · -1 km deep · 2 km away
  60. 2.57 km W of Cobb, California · 15717 days ago · -1 km deep · 3 km away

The first 60 of 177.

Before

  1. 2.012 km WSW of Hopland, California · 15737 days ago · 0 km deep · 39 km away
  2. 2.17 km W of Cobb, California · 15737 days ago · 3 km deep · 2 km away
  3. 1.92 km ENE of Calpella, California · 15737 days ago · 8 km deep · 58 km away
  4. 2.25 km E of Lower Lake, California · 15738 days ago · 5 km deep · 27 km away
  5. 1.55 km SSW of Cobb, California · 15738 days ago · 0 km deep · 6 km away
  6. 1.54 km S of Cobb, California · 15738 days ago · 1 km deep · 9 km away
  7. 1.73 km S of Cobb, California · 15738 days ago · 0 km deep · 9 km away
  8. 1.74 km S of Cobb, California · 15739 days ago · 1 km deep · 9 km away
  9. 1.84 km S of Cobb, California · 15739 days ago · 1 km deep · 9 km away
  10. 1.96 km WSW of Cobb, California · 15739 days ago · 0 km deep · 3 km away
  11. 2.94 km ENE of Hopland, California · 15740 days ago · 6 km deep · 29 km away
  12. 1.66 km W of Cobb, California · 15740 days ago · 1 km deep · 3 km away
  13. 1.66 km WSW of Cobb, California · 15741 days ago · 1 km deep · 2 km away
  14. 1.65 km SSW of Cobb, California · 15742 days ago · 0 km deep · 7 km away
  15. 1.87 km W of Cobb, California · 15742 days ago · 3 km deep · 2 km away
  16. 2.37 km WSW of Cobb, California · 15742 days ago · 0 km deep · 2 km away
  17. 1.64 km S of Cobb, California · 15743 days ago · 0 km deep · 9 km away
  18. 1.66 km W of Cobb, California · 15743 days ago · 2 km deep · 3 km away
  19. 1.76 km ESE of Calpella, California · 15743 days ago · -1 km deep · 54 km away
  20. 1.76 km S of Cobb, California · 15743 days ago · 0 km deep · 10 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1101663. Read Thu, Oct 1, 2026, 7:06 PM UTC.