California earthquakes

M1.6 earthquake 8 km W of Cobb, California

A magnitude 1.6 earthquake struck 8 km W of Cobb, California on Wed, Dec 9, 1987, 12:40 AM PST (08:40 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M1.7 5 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
1.6 (md), micro
Local time
UTC
1987-12-09 08:40:22 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
38.818° N, 122.822° 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 0.9 km horizontally, 2.9 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
117°
Stations used
6

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. 1.75 km SW of Cobb, California · 14163 days ago · 1 km deep · 6 km away
  2. 1.75 km WNW of Cobb, California · 14163 days ago · 4 km deep · 4 km away
  3. 1.68 km W of Cobb, California · 14163 days ago · 0 km deep · 0 km away
  4. 1.67 km WSW of Cobb, California · 14163 days ago · 4 km deep · 3 km away
  5. 2.15 km W of Cobb, California · 14163 days ago · 3 km deep · 3 km away
  6. 1.86 km W of Cobb, California · 14163 days ago · 2 km deep · 3 km away
  7. 1.77 km W of Cobb, California · 14162 days ago · 0 km deep · 2 km away
  8. 1.76 km W of Cobb, California · 14162 days ago · 2 km deep · 2 km away
  9. 1.89 km S of Moskowite Corner, California · 14161 days ago · 8 km deep · 75 km away
  10. 1.76 km W of Cobb, California · 14161 days ago · 3 km deep · 2 km away
  11. 2.14 km S of Cobb, California · 14161 days ago · 1 km deep · 10 km away
  12. 1.64 km ESE of Santa Rosa, California · 14161 days ago · 9 km deep · 45 km away
  13. 1.77 km WSW of Cobb, California · 14161 days ago · -1 km deep · 3 km away
  14. 2.918 km NNE of Upper Lake, California · 14160 days ago · 3 km deep · 56 km away
  15. 2.27 km W of Cobb, California · 14160 days ago · 3 km deep · 1 km away
  16. 1.85 km WNW of Cobb, California · 14159 days ago · 2 km deep · 5 km away
  17. 1.66 km S of Cobb, California · 14159 days ago · -1 km deep · 10 km away
  18. 1.79 km W of Cobb, California · 14159 days ago · -1 km deep · 1 km away
  19. 1.86 km WSW of Cobb, California · 14159 days ago · 3 km deep · 2 km away
  20. 1.55 km SW of Cobb, California · 14158 days ago · 1 km deep · 6 km away
  21. 1.96 km WSW of Cobb, California · 14157 days ago · 4 km deep · 3 km away
  22. 2.02 km E of Cobb, California · 14157 days ago · 3 km deep · 11 km away
  23. 1.66 km W of Cobb, California · 14155 days ago · 3 km deep · 2 km away
  24. 2.6Northern California · 14154 days ago · 1 km deep · 13 km away
  25. 2.08 km WSW of Cobb, California · 14154 days ago · 3 km deep · 2 km away
  26. 1.85 km SW of Cobb, California · 14153 days ago · -1 km deep · 7 km away
  27. 1.55 km SSW of Cobb, California · 14153 days ago · 0 km deep · 8 km away
  28. 1.85 km WSW of Cobb, California · 14152 days ago · 2 km deep · 4 km away
  29. 1.67 km ENE of Larkfield-Wikiup, California · 14151 days ago · 6 km deep · 35 km away
  30. 1.68 km WSW of Cobb, California · 14151 days ago · -1 km deep · 3 km away
  31. 2.14 km WSW of Cobb, California · 14151 days ago · -1 km deep · 5 km away
  32. 1.75 km SSW of Cobb, California · 14151 days ago · 1 km deep · 8 km away
  33. 2.17 km WSW of Cobb, California · 14151 days ago · -1 km deep · 4 km away
  34. 1.89 km W of Cobb, California · 14150 days ago · 0 km deep · 1 km away
  35. 1.68 km W of Cobb, California · 14150 days ago · 1 km deep · 0 km away
  36. 1.75 km WSW of Cobb, California · 14150 days ago · 0 km deep · 4 km away
  37. 1.94 km W of Cobb, California · 14149 days ago · 0 km deep · 4 km away
  38. 1.77 km WSW of Cobb, California · 14149 days ago · 1 km deep · 2 km away
  39. 1.87 km WSW of Cobb, California · 14149 days ago · 5 km deep · 3 km away
  40. 1.57 km WSW of Cobb, California · 14148 days ago · 2 km deep · 4 km away
  41. 2.66 km W of Cobb, California · 14148 days ago · 3 km deep · 2 km away
  42. 2.112 km ESE of Angwin, California · 14148 days ago · 3 km deep · 54 km away
  43. 1.66 km W of Cobb, California · 14148 days ago · 3 km deep · 2 km away
  44. 1.87 km WSW of Cobb, California · 14148 days ago · 1 km deep · 2 km away
  45. 2.4Northern California · 14147 days ago · 2 km deep · 2 km away
  46. 3.14 km W of Cobb, California · 14147 days ago · 0 km deep · 4 km away
  47. 1.68 km ENE of Hidden Valley Lake, California · 14147 days ago · 8 km deep · 31 km away
  48. 2.810 km NW of Cobb, California · 14146 days ago · 3 km deep · 7 km away
  49. 1.84 km S of Cobb, California · 14145 days ago · 2 km deep · 10 km away
  50. 1.710 km W of Cobb, California · 14144 days ago · -1 km deep · 2 km away
  51. 2.110 km WSW of Williams, California · 14144 days ago · 2 km deep · 58 km away
  52. 1.66 km WSW of Cobb, California · 14143 days ago · -1 km deep · 4 km away
  53. 1.59 km W of Cobb, California · 14143 days ago · 13 km deep · 1 km away
  54. 1.79 km W of Cobb, California · 14143 days ago · 1 km deep · 1 km away
  55. 2.39 km W of Cobb, California · 14143 days ago · -1 km deep · 1 km away
  56. 1.67 km WSW of Cobb, California · 14142 days ago · 1 km deep · 2 km away
  57. 1.69 km N of Cloverdale, California · 14142 days ago · 1 km deep · 18 km away
  58. 1.76 km W of Cobb, California · 14142 days ago · 1 km deep · 2 km away
  59. 1.87 km W of Cobb, California · 14142 days ago · 0 km deep · 1 km away
  60. 1.710 km W of Cobb, California · 14142 days ago · 3 km deep · 2 km away

The first 60 of 170.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1154256. Read Tue, Sep 22, 2026, 9:43 PM UTC.