California earthquakes

M1.7 earthquake 7 km WSW of Cobb, California

A magnitude 1.7 earthquake struck 7 km WSW of Cobb, California on Tue, Dec 15, 1987, 10:28 PM PST (06:28 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M2.6 Northern 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
1.7 (md), micro
Local time
UTC
1987-12-16 06:28:15 UTC
Depth
-0.7 km (-0.5 mi), shallow
Epicenter
38.800° N, 122.803° 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 0.7 km horizontally, 3.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
135°
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. 2.6Northern California · 14154 days ago · 1 km deep · 10 km away
  2. 2.08 km WSW of Cobb, California · 14154 days ago · 3 km deep · 1 km away
  3. 1.85 km SW of Cobb, California · 14153 days ago · -1 km deep · 4 km away
  4. 1.55 km SSW of Cobb, California · 14152 days ago · 0 km deep · 5 km away
  5. 1.85 km WSW of Cobb, California · 14152 days ago · 2 km deep · 2 km away
  6. 1.67 km ENE of Larkfield-Wikiup, California · 14151 days ago · 6 km deep · 32 km away
  7. 1.68 km WSW of Cobb, California · 14151 days ago · -1 km deep · 2 km away
  8. 2.14 km WSW of Cobb, California · 14151 days ago · -1 km deep · 3 km away
  9. 1.75 km SSW of Cobb, California · 14151 days ago · 1 km deep · 6 km away
  10. 2.17 km WSW of Cobb, California · 14151 days ago · -1 km deep · 1 km away
  11. 1.89 km W of Cobb, California · 14150 days ago · 0 km deep · 3 km away
  12. 1.68 km W of Cobb, California · 14150 days ago · 1 km deep · 3 km away
  13. 1.75 km WSW of Cobb, California · 14149 days ago · 0 km deep · 2 km away
  14. 1.94 km W of Cobb, California · 14148 days ago · 0 km deep · 3 km away
  15. 1.77 km WSW of Cobb, California · 14148 days ago · 1 km deep · 0 km away
  16. 1.87 km WSW of Cobb, California · 14148 days ago · 5 km deep · 1 km away
  17. 1.57 km WSW of Cobb, California · 14148 days ago · 2 km deep · 1 km away
  18. 2.66 km W of Cobb, California · 14148 days ago · 3 km deep · 2 km away
  19. 2.112 km ESE of Angwin, California · 14148 days ago · 3 km deep · 52 km away
  20. 1.66 km W of Cobb, California · 14148 days ago · 3 km deep · 2 km away
  21. 1.87 km WSW of Cobb, California · 14148 days ago · 1 km deep · 0 km away
  22. 2.4Northern California · 14147 days ago · 2 km deep · 2 km away
  23. 3.14 km W of Cobb, California · 14147 days ago · 0 km deep · 4 km away
  24. 1.68 km ENE of Hidden Valley Lake, California · 14146 days ago · 8 km deep · 29 km away
  25. 2.810 km NW of Cobb, California · 14145 days ago · 3 km deep · 9 km away
  26. 1.84 km S of Cobb, California · 14145 days ago · 2 km deep · 8 km away
  27. 1.710 km W of Cobb, California · 14144 days ago · -1 km deep · 4 km away
  28. 2.110 km WSW of Williams, California · 14144 days ago · 2 km deep · 58 km away
  29. 1.66 km WSW of Cobb, California · 14143 days ago · -1 km deep · 1 km away
  30. 1.59 km W of Cobb, California · 14143 days ago · 13 km deep · 3 km away
  31. 1.79 km W of Cobb, California · 14143 days ago · 1 km deep · 4 km away
  32. 2.39 km W of Cobb, California · 14142 days ago · -1 km deep · 3 km away
  33. 1.67 km WSW of Cobb, California · 14142 days ago · 1 km deep · 1 km away
  34. 1.69 km N of Cloverdale, California · 14142 days ago · 1 km deep · 20 km away
  35. 1.76 km W of Cobb, California · 14142 days ago · 1 km deep · 2 km away
  36. 1.87 km W of Cobb, California · 14141 days ago · 0 km deep · 2 km away
  37. 1.710 km W of Cobb, California · 14141 days ago · 3 km deep · 4 km away
  38. 1.82 km NE of Santa Rosa, California · 14141 days ago · 8 km deep · 39 km away
  39. 1.510 km NNE of Cloverdale, California · 14141 days ago · 7 km deep · 16 km away
  40. 1.96 km SW of Cobb, California · 14140 days ago · 2 km deep · 4 km away
  41. 1.69 km WSW of Cobb, California · 14140 days ago · -1 km deep · 2 km away
  42. 1.56 km WSW of Cobb, California · 14140 days ago · 13 km deep · 1 km away
  43. 1.86 km W of Cobb, California · 14140 days ago · 0 km deep · 3 km away
  44. 2.07 km W of Cobb, California · 14140 days ago · 1 km deep · 3 km away
  45. 1.79 km WSW of Cobb, California · 14140 days ago · -1 km deep · 2 km away
  46. 1.79 km WSW of Cobb, California · 14139 days ago · 1 km deep · 2 km away
  47. 1.79 km W of Cobb, California · 14139 days ago · 1 km deep · 4 km away
  48. 2.08 km W of Cobb, California · 14138 days ago · 0 km deep · 2 km away
  49. 1.811 km SW of Kelseyville, California · 14138 days ago · 6 km deep · 14 km away
  50. 1.88 km W of Cobb, California · 14138 days ago · 1 km deep · 3 km away
  51. 1.75 km W of Cobb, California · 14137 days ago · 0 km deep · 3 km away
  52. 1.54 km WSW of Cobb, California · 14137 days ago · 0 km deep · 3 km away
  53. 1.86 km WNW of Cobb, California · 14136 days ago · 3 km deep · 4 km away
  54. 1.96 km W of Cobb, California · 14136 days ago · 2 km deep · 2 km away
  55. 1.94 km WSW of Cobb, California · 14136 days ago · 2 km deep · 3 km away
  56. 1.86 km SW of Cobb, California · 14136 days ago · 2 km deep · 3 km away
  57. 2.67 km WSW of Cobb, California · 14136 days ago · 1 km deep · 1 km away
  58. 2.27 km WNW of Princeton, California · 14136 days ago · 24 km deep · 93 km away
  59. 1.64 km WNW of Cobb, California · 14136 days ago · 2 km deep · 4 km away
  60. 2.17 km W of Cobb, California · 14135 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 nc1154346. Read Tue, Sep 22, 2026, 10:55 AM UTC.