California earthquakes

M2.1 earthquake 7 km WSW of Cobb, California

A magnitude 2.1 earthquake struck 7 km WSW of Cobb, California on Sun, Aug 23, 1987, 8:23 PM PDT (03:23 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 4 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.

Open the live map with earthquakes

The earthquake

Magnitude
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-08-24 03:23:00 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.806° N, 122.812° 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
±0.09
Depth from
From location
Station coverage gap
38°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 160 in the 60 days after this one and 102 in the 30 days before it.

After

  1. 2.67 km W of Cobb, California · 14284 days ago · 0 km deep · 3 km away
  2. 1.88 km NW of Redwood Valley, California · 14284 days ago · 2 km deep · 69 km away
  3. 1.611 km N of Brooktrails, California · 14283 days ago · 6 km deep · 96 km away
  4. 1.64 km S of Cobb, California · 14283 days ago · -1 km deep · 8 km away
  5. 2.45 km SW of Cobb, California · 14283 days ago · 0 km deep · 5 km away
  6. 1.82 km WNW of Brooktrails, California · 14283 days ago · 2 km deep · 89 km away
  7. 1.86 km NE of Brooktrails, California · 14283 days ago · 5 km deep · 88 km away
  8. 1.79 km W of Cobb, California · 14281 days ago · -1 km deep · 2 km away
  9. 2.16 km E of Hidden Valley Lake, California · 14281 days ago · 14 km deep · 29 km away
  10. 2.18 km W of Cobb, California · 14280 days ago · 0 km deep · 2 km away
  11. 1.88 km W of Cobb, California · 14280 days ago · 0 km deep · 2 km away
  12. 2.38 km WSW of Cobb, California · 14280 days ago · 2 km deep · 1 km away
  13. 2.56 km W of Cobb, California · 14279 days ago · 1 km deep · 1 km away
  14. 2.26 km W of Cobb, California · 14279 days ago · 3 km deep · 2 km away
  15. 1.7Northern California · 14279 days ago · 0 km deep · 2 km away
  16. 2.37 km WSW of Cobb, California · 14279 days ago · 1 km deep · 0 km away
  17. 2.028 km NNE of Potter Valley, California · 14278 days ago · 13 km deep · 85 km away
  18. 2.05 km WNW of Cobb, California · 14277 days ago · 2 km deep · 4 km away
  19. 1.65 km SSW of Cobb, California · 14277 days ago · 0 km deep · 5 km away
  20. 2.14 km W of Cobb, California · 14277 days ago · 0 km deep · 3 km away
  21. 1.97 km W of Cobb, California · 14277 days ago · 3 km deep · 2 km away
  22. 2.05 km SSE of Kelseyville, California · 14275 days ago · 0 km deep · 14 km away
  23. 3.08 km W of Cobb, California · 14275 days ago · 1 km deep · 1 km away
  24. 2.06 km NNE of Penngrove, California · 14275 days ago · 4 km deep · 53 km away
  25. 1.76 km W of Cobb, California · 14275 days ago · 1 km deep · 3 km away
  26. 1.76 km W of Cobb, California · 14275 days ago · 3 km deep · 2 km away
  27. 1.87 km WSW of Cobb, California · 14274 days ago · 4 km deep · 1 km away
  28. 1.65 km SW of Cobb, California · 14274 days ago · -1 km deep · 4 km away
  29. 1.83 km NNW of Cloverdale, California · 14274 days ago · -1 km deep · 19 km away
  30. 1.67 km W of Cobb, California · 14274 days ago · 0 km deep · 2 km away
  31. 1.57 km WSW of Cobb, California · 14274 days ago · 1 km deep · 1 km away
  32. 1.97 km WSW of Cobb, California · 14273 days ago · 4 km deep · 1 km away
  33. 1.56 km W of Cobb, California · 14273 days ago · 3 km deep · 2 km away
  34. 2.026 km NNE of Potter Valley, California · 14273 days ago · 4 km deep · 84 km away
  35. 2.04 km W of Cobb, California · 14273 days ago · 0 km deep · 4 km away
  36. 2.05 km W of Cobb, California · 14272 days ago · 0 km deep · 3 km away
  37. 1.85 km W of Cobb, California · 14272 days ago · 0 km deep · 3 km away
  38. 1.79 km WNW of Cobb, California · 14271 days ago · 0 km deep · 5 km away
  39. 2.71 km E of Willits, California · 14271 days ago · 5 km deep · 81 km away
  40. 1.824 km NNE of Potter Valley, California · 14270 days ago · 6 km deep · 81 km away
  41. 2.06 km W of Cobb, California · 14270 days ago · -1 km deep · 2 km away
  42. 1.56 km W of Cobb, California · 14270 days ago · 3 km deep · 2 km away
  43. 1.77 km W of Cobb, California · 14270 days ago · 0 km deep · 2 km away
  44. 2.38 km W of Cobb, California · 14269 days ago · 1 km deep · 1 km away
  45. 2.36 km WSW of Cobb, California · 14268 days ago · 1 km deep · 2 km away
  46. 1.85 km SW of Cobb, California · 14268 days ago · 0 km deep · 4 km away
  47. 1.64 km SW of Cobb, California · 14267 days ago · 1 km deep · 4 km away
  48. 1.54 km WNW of Cobb, California · 14267 days ago · 2 km deep · 5 km away
  49. 1.96 km SW of Cobb, California · 14267 days ago · 2 km deep · 4 km away
  50. 2.06 km WSW of Cobb, California · 14266 days ago · 3 km deep · 1 km away
  51. 1.96 km SW of Middletown, California · 14266 days ago · 4 km deep · 15 km away
  52. 1.65 km SW of Cobb, California · 14266 days ago · 0 km deep · 5 km away
  53. 1.73 km WNW of Cobb, California · 14266 days ago · 0 km deep · 5 km away
  54. 2.16 km W of Cobb, California · 14266 days ago · 3 km deep · 2 km away
  55. 2.86 km W of Cobb, California · 14266 days ago · 3 km deep · 2 km away
  56. 1.66 km W of Cobb, California · 14266 days ago · 3 km deep · 2 km away
  57. 1.76 km W of Cobb, California · 14266 days ago · 4 km deep · 2 km away
  58. 1.54 km SW of Cobb, California · 14265 days ago · 0 km deep · 5 km away
  59. 2.410 km W of Cobb, California · 14265 days ago · 1 km deep · 3 km away
  60. 1.64 km SW of Cobb, California · 14265 days ago · 0 km deep · 5 km away

The first 60 of 160.

Before

  1. 1.711 km WNW of Redwood Valley, California · 14284 days ago · 6 km deep · 71 km away
  2. 2.06 km WSW of Cobb, California · 14284 days ago · 1 km deep · 2 km away
  3. 2.14 km W of Cobb, California · 14285 days ago · 1 km deep · 4 km away
  4. 2.06 km WSW of Cobb, California · 14285 days ago · 1 km deep · 1 km away
  5. 1.87 km W of Cobb, California · 14285 days ago · 3 km deep · 1 km away
  6. 2.27 km WSW of Cobb, California · 14285 days ago · 0 km deep · 0 km away
  7. 2.9Northern California · 14285 days ago · 2 km deep · 11 km away
  8. 1.65 km WNW of Cobb, California · 14285 days ago · 1 km deep · 4 km away
  9. 2.16 km W of Cobb, California · 14286 days ago · 3 km deep · 2 km away
  10. 1.86 km W of Cobb, California · 14286 days ago · 3 km deep · 2 km away
  11. 1.75 km W of Cobb, California · 14287 days ago · 0 km deep · 4 km away
  12. 1.66 km W of Cobb, California · 14287 days ago · 1 km deep · 2 km away
  13. 1.96 km W of Cobb, California · 14287 days ago · 0 km deep · 3 km away
  14. 1.86 km W of Cobb, California · 14287 days ago · 0 km deep · 3 km away
  15. 1.96 km W of Cobb, California · 14287 days ago · -1 km deep · 3 km away
  16. 1.63 km NNW of Cloverdale, California · 14287 days ago · 2 km deep · 19 km away
  17. 2.16 km W of Cobb, California · 14288 days ago · 3 km deep · 2 km away
  18. 2.67 km W of Cobb, California · 14289 days ago · 3 km deep · 1 km away
  19. 2.110 km ENE of Lucerne, California · 14289 days ago · 24 km deep · 38 km away
  20. 2.58 km W of Cobb, California · 14289 days ago · 0 km deep · 1 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc104973. Read Fri, Oct 2, 2026, 2:52 AM UTC.