California earthquakes

M1.9 earthquake 4 km WSW of Cobb, California

A magnitude 1.9 earthquake struck 4 km WSW of Cobb, California on Mon, Dec 7, 1987, 11:32 AM PST (19:32 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.2 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
1.9 (md), micro
Local time
UTC
1987-12-07 19:32:20 UTC
Depth
1.5 km (0.9 mi), shallow
Epicenter
38.803° N, 122.774° 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, 0.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
102°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 168 in the 60 days after this one and 93 in the 30 days before it.

After

  1. 1.97 km SW of Cobb, California · 14177 days ago · -1 km deep · 4 km away
  2. 2.16 km W of Cobb, California · 14177 days ago · 3 km deep · 3 km away
  3. 1.68 km WNW of American Canyon, California · 14177 days ago · 13 km deep · 77 km away
  4. 3.25 km SW of Cobb, California · 14176 days ago · 1 km deep · 3 km away
  5. 1.65 km SW of Cobb, California · 14176 days ago · -1 km deep · 2 km away
  6. 2.08 km W of Cobb, California · 14176 days ago · 1 km deep · 5 km away
  7. 1.68 km W of Cobb, California · 14176 days ago · 4 km deep · 4 km away
  8. 1.78 km W of Cobb, California · 14175 days ago · 2 km deep · 4 km away
  9. 1.94 km WSW of Cobb, California · 14175 days ago · -1 km deep · 1 km away
  10. 2.9near the coast of Northern California · 14174 days ago · -1 km deep · 77 km away
  11. 1.7Northern California · 14174 days ago · 2 km deep · 1 km away
  12. 2.16 km WSW of Cobb, California · 14173 days ago · 3 km deep · 2 km away
  13. 1.64 km WSW of Cobb, California · 14172 days ago · 0 km deep · 0 km away
  14. 2.06 km SW of Cobb, California · 14172 days ago · 1 km deep · 2 km away
  15. 1.96 km SW of Cobb, California · 14172 days ago · 1 km deep · 2 km away
  16. 1.75 km SW of Cobb, California · 14172 days ago · 1 km deep · 2 km away
  17. 1.75 km WNW of Cobb, California · 14172 days ago · 4 km deep · 4 km away
  18. 1.68 km W of Cobb, California · 14171 days ago · 0 km deep · 4 km away
  19. 1.67 km WSW of Cobb, California · 14171 days ago · 4 km deep · 3 km away
  20. 2.15 km W of Cobb, California · 14171 days ago · 3 km deep · 2 km away
  21. 1.86 km W of Cobb, California · 14171 days ago · 2 km deep · 3 km away
  22. 1.77 km W of Cobb, California · 14170 days ago · 0 km deep · 4 km away
  23. 1.76 km W of Cobb, California · 14170 days ago · 2 km deep · 3 km away
  24. 1.89 km S of Moskowite Corner, California · 14170 days ago · 8 km deep · 71 km away
  25. 1.76 km W of Cobb, California · 14169 days ago · 3 km deep · 3 km away
  26. 2.14 km S of Cobb, California · 14169 days ago · 1 km deep · 5 km away
  27. 1.64 km ESE of Santa Rosa, California · 14169 days ago · 9 km deep · 43 km away
  28. 1.77 km WSW of Cobb, California · 14169 days ago · -1 km deep · 2 km away
  29. 2.918 km NNE of Upper Lake, California · 14168 days ago · 3 km deep · 58 km away
  30. 2.27 km W of Cobb, California · 14168 days ago · 3 km deep · 4 km away
  31. 1.85 km WNW of Cobb, California · 14168 days ago · 2 km deep · 4 km away
  32. 1.66 km S of Cobb, California · 14168 days ago · -1 km deep · 5 km away
  33. 1.79 km W of Cobb, California · 14167 days ago · -1 km deep · 5 km away
  34. 1.86 km WSW of Cobb, California · 14167 days ago · 3 km deep · 2 km away
  35. 1.55 km SW of Cobb, California · 14166 days ago · 1 km deep · 2 km away
  36. 1.96 km WSW of Cobb, California · 14165 days ago · 4 km deep · 2 km away
  37. 2.02 km E of Cobb, California · 14165 days ago · 3 km deep · 8 km away
  38. 1.66 km W of Cobb, California · 14163 days ago · 3 km deep · 3 km away
  39. 2.6Northern California · 14162 days ago · 1 km deep · 8 km away
  40. 2.08 km WSW of Cobb, California · 14162 days ago · 3 km deep · 3 km away
  41. 1.85 km SW of Cobb, California · 14161 days ago · -1 km deep · 3 km away
  42. 1.55 km SSW of Cobb, California · 14161 days ago · 0 km deep · 4 km away
  43. 1.85 km WSW of Cobb, California · 14160 days ago · 2 km deep · 1 km away
  44. 1.67 km ENE of Larkfield-Wikiup, California · 14159 days ago · 6 km deep · 32 km away
  45. 1.68 km WSW of Cobb, California · 14159 days ago · -1 km deep · 4 km away
  46. 2.14 km WSW of Cobb, California · 14159 days ago · -1 km deep · 1 km away
  47. 1.75 km SSW of Cobb, California · 14159 days ago · 1 km deep · 4 km away
  48. 2.17 km WSW of Cobb, California · 14159 days ago · -1 km deep · 2 km away
  49. 1.89 km W of Cobb, California · 14158 days ago · 0 km deep · 5 km away
  50. 1.68 km W of Cobb, California · 14158 days ago · 1 km deep · 4 km away
  51. 1.75 km WSW of Cobb, California · 14158 days ago · 0 km deep · 1 km away
  52. 1.94 km W of Cobb, California · 14157 days ago · 0 km deep · 2 km away
  53. 1.77 km WSW of Cobb, California · 14157 days ago · 1 km deep · 3 km away
  54. 1.87 km WSW of Cobb, California · 14157 days ago · 5 km deep · 2 km away
  55. 1.57 km WSW of Cobb, California · 14156 days ago · 2 km deep · 3 km away
  56. 2.66 km W of Cobb, California · 14156 days ago · 3 km deep · 3 km away
  57. 2.112 km ESE of Angwin, California · 14156 days ago · 3 km deep · 50 km away
  58. 1.66 km W of Cobb, California · 14156 days ago · 3 km deep · 3 km away
  59. 1.87 km WSW of Cobb, California · 14156 days ago · 1 km deep · 2 km away
  60. 2.4Northern California · 14155 days ago · 2 km deep · 3 km away

The first 60 of 168.

Before

  1. 1.94 km WSW of Cobb, California · 14178 days ago · 1 km deep · 0 km away
  2. 1.79 km ESE of Hidden Valley Lake, California · 14178 days ago · 7 km deep · 28 km away
  3. 2.16 km WNW of Cobb, California · 14178 days ago · 1 km deep · 4 km away
  4. 1.89 km W of Cobb, California · 14178 days ago · 0 km deep · 5 km away
  5. 2.56 km WSW of Cobb, California · 14179 days ago · 0 km deep · 1 km away
  6. 2.05 km WSW of Cobb, California · 14179 days ago · 0 km deep · 1 km away
  7. 1.97 km WSW of Cobb, California · 14179 days ago · 1 km deep · 2 km away
  8. 1.95 km W of Cobb, California · 14180 days ago · 1 km deep · 3 km away
  9. 1.519 km ENE of Sea Ranch, California · 14180 days ago · 4 km deep · 42 km away
  10. 2.719 km ENE of Sea Ranch, California · 14180 days ago · 4 km deep · 42 km away
  11. 2.17 km E of Potter Valley, California · 14181 days ago · 0 km deep · 61 km away
  12. 1.6Northern California · 14181 days ago · 1 km deep · 4 km away
  13. 1.97 km WSW of Cobb, California · 14182 days ago · 3 km deep · 3 km away
  14. 2.57 km WSW of Cobb, California · 14182 days ago · 3 km deep · 3 km away
  15. 1.78 km W of Cobb, California · 14183 days ago · 0 km deep · 4 km away
  16. 1.69 km W of Cobb, California · 14183 days ago · -1 km deep · 5 km away
  17. 2.86 km W of Cobb, California · 14183 days ago · 1 km deep · 3 km away
  18. 1.69 km W of Cobb, California · 14183 days ago · 0 km deep · 5 km away
  19. 2.16 km W of Cobb, California · 14183 days ago · 3 km deep · 3 km away
  20. 2.012 km WSW of Hopland, California · 14183 days ago · 6 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc109643. Read Wed, Sep 30, 2026, 11:36 PM UTC.