California earthquakes

M1.8 earthquake 5 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 5 km WSW of Cobb, California on Tue, Jul 28, 1987, 10:15 PM PDT (05:15 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M2.0 10 km SE of Willits, 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), micro
Local time
UTC
1987-07-29 05:15:11 UTC
Depth
0.5 km (0.3 mi), shallow
Epicenter
38.811° N, 122.789° 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 0.5 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
125°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 166 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.86 km SW of Cobb, California · 14287 days ago · 0 km deep · 3 km away
  2. 2.010 km SE of Willits, California · 14287 days ago · 0 km deep · 72 km away
  3. 1.86 km WSW of Cobb, California · 14286 days ago · 0 km deep · 1 km away
  4. 1.86 km WSW of Cobb, California · 14286 days ago · 1 km deep · 1 km away
  5. 1.66 km W of Cobb, California · 14286 days ago · 2 km deep · 2 km away
  6. 1.83 km N of Cloverdale, California · 14286 days ago · 0 km deep · 21 km away
  7. 1.66 km SW of Cobb, California · 14286 days ago · 0 km deep · 4 km away
  8. 1.57 km WSW of Cobb, California · 14286 days ago · 3 km deep · 3 km away
  9. 1.87 km WSW of Cobb, California · 14285 days ago · 1 km deep · 2 km away
  10. 1.79 km SE of Boonville, California · 14285 days ago · 7 km deep · 45 km away
  11. 1.56 km W of Cobb, California · 14285 days ago · 2 km deep · 1 km away
  12. 1.55 km WNW of Cobb, California · 14285 days ago · 1 km deep · 2 km away
  13. 1.74 km W of Cobb, California · 14285 days ago · 1 km deep · 1 km away
  14. 2.27 km W of Cobb, California · 14284 days ago · 4 km deep · 2 km away
  15. 1.84 km SW of Cobb, California · 14284 days ago · 0 km deep · 3 km away
  16. 1.87 km W of Cobb, California · 14284 days ago · 1 km deep · 3 km away
  17. 1.87 km WSW of Cobb, California · 14284 days ago · 2 km deep · 2 km away
  18. 1.97 km WSW of Cobb, California · 14283 days ago · 1 km deep · 2 km away
  19. 1.72 km SSW of Clearlake, California · 14283 days ago · 3 km deep · 19 km away
  20. 1.8Northern California · 14282 days ago · 1 km deep · 3 km away
  21. 1.59 km ESE of Hidden Valley Lake, California · 14282 days ago · 5 km deep · 29 km away
  22. 1.91 km W of Green Valley, California · 14282 days ago · 10 km deep · 82 km away
  23. 2.15 km SW of Cobb, California · 14282 days ago · 2 km deep · 3 km away
  24. 2.06 km W of Cobb, California · 14282 days ago · 4 km deep · 2 km away
  25. 1.65 km W of Cobb, California · 14282 days ago · 1 km deep · 2 km away
  26. 1.63 km NNW of Cloverdale, California · 14281 days ago · -1 km deep · 21 km away
  27. 1.75 km WSW of Cobb, California · 14281 days ago · 0 km deep · 2 km away
  28. 1.811 km SSW of Cloverdale, California · 14281 days ago · 4 km deep · 28 km away
  29. 1.64 km SW of Cobb, California · 14280 days ago · 0 km deep · 4 km away
  30. 2.58 km W of Cobb, California · 14280 days ago · 0 km deep · 3 km away
  31. 2.110 km ENE of Lucerne, California · 14280 days ago · 24 km deep · 37 km away
  32. 2.67 km W of Cobb, California · 14280 days ago · 3 km deep · 2 km away
  33. 2.16 km W of Cobb, California · 14279 days ago · 3 km deep · 2 km away
  34. 1.63 km NNW of Cloverdale, California · 14278 days ago · 2 km deep · 21 km away
  35. 1.96 km W of Cobb, California · 14278 days ago · -1 km deep · 2 km away
  36. 1.86 km W of Cobb, California · 14278 days ago · 0 km deep · 2 km away
  37. 1.96 km W of Cobb, California · 14278 days ago · 0 km deep · 2 km away
  38. 1.66 km W of Cobb, California · 14278 days ago · 1 km deep · 2 km away
  39. 1.75 km W of Cobb, California · 14278 days ago · 0 km deep · 2 km away
  40. 1.86 km W of Cobb, California · 14277 days ago · 3 km deep · 1 km away
  41. 2.16 km W of Cobb, California · 14277 days ago · 3 km deep · 1 km away
  42. 1.65 km WNW of Cobb, California · 14276 days ago · 1 km deep · 2 km away
  43. 2.9Northern California · 14276 days ago · 2 km deep · 10 km away
  44. 2.27 km WSW of Cobb, California · 14276 days ago · 0 km deep · 2 km away
  45. 1.87 km W of Cobb, California · 14276 days ago · 3 km deep · 2 km away
  46. 2.06 km WSW of Cobb, California · 14276 days ago · 1 km deep · 1 km away
  47. 2.14 km W of Cobb, California · 14276 days ago · 1 km deep · 2 km away
  48. 2.06 km WSW of Cobb, California · 14276 days ago · 1 km deep · 1 km away
  49. 1.711 km WNW of Redwood Valley, California · 14275 days ago · 6 km deep · 72 km away
  50. 2.17 km WSW of Cobb, California · 14275 days ago · 1 km deep · 2 km away
  51. 2.67 km W of Cobb, California · 14275 days ago · 0 km deep · 3 km away
  52. 1.88 km NW of Redwood Valley, California · 14275 days ago · 2 km deep · 70 km away
  53. 1.611 km N of Brooktrails, California · 14274 days ago · 6 km deep · 97 km away
  54. 1.64 km S of Cobb, California · 14274 days ago · -1 km deep · 6 km away
  55. 2.45 km SW of Cobb, California · 14274 days ago · 0 km deep · 4 km away
  56. 1.82 km WNW of Brooktrails, California · 14274 days ago · 2 km deep · 89 km away
  57. 1.86 km NE of Brooktrails, California · 14274 days ago · 5 km deep · 89 km away
  58. 1.79 km W of Cobb, California · 14272 days ago · -1 km deep · 4 km away
  59. 2.16 km E of Hidden Valley Lake, California · 14272 days ago · 14 km deep · 27 km away
  60. 2.18 km W of Cobb, California · 14272 days ago · 0 km deep · 3 km away

The first 60 of 166.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1151521. Read Wed, Sep 23, 2026, 4:50 AM UTC.