California earthquakes

M2.1 earthquake 6 km W of Cobb, California

A magnitude 2.1 earthquake struck 6 km W of Cobb, California on Sun, Apr 12, 1987, 3:27 PM PDT (22:27 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.5 5 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.

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The earthquake

Magnitude
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-04-12 22:27:22 UTC
Depth
3.7 km (2.3 mi), shallow
Epicenter
38.827° N, 122.802° 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 0.1 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
42°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 175 in the 60 days after this one and 100 in the 30 days before it.

After

  1. 1.9Northern California · 14417 days ago · 0 km deep · 3 km away
  2. 1.86 km W of Cobb, California · 14416 days ago · 3 km deep · 1 km away
  3. 1.62 km ESE of Calpella, California · 14416 days ago · 5 km deep · 55 km away
  4. 1.97 km W of Cobb, California · 14416 days ago · 4 km deep · 2 km away
  5. 1.87 km W of Cobb, California · 14416 days ago · 4 km deep · 2 km away
  6. 2.06 km SW of Cobb, California · 14415 days ago · 3 km deep · 5 km away
  7. 1.67 km W of Cobb, California · 14414 days ago · 3 km deep · 2 km away
  8. 1.65 km SW of Cobb, California · 14414 days ago · 0 km deep · 6 km away
  9. 1.66 km W of Cobb, California · 14414 days ago · 2 km deep · 1 km away
  10. 1.87 km WSW of Cobb, California · 14414 days ago · 1 km deep · 3 km away
  11. 1.95 km SSW of Cobb, California · 14414 days ago · 0 km deep · 6 km away
  12. 1.67 km W of Cobb, California · 14414 days ago · 1 km deep · 1 km away
  13. 1.83 km W of Cobb, California · 14413 days ago · 1 km deep · 3 km away
  14. 1.86 km SW of Cobb, California · 14413 days ago · 2 km deep · 5 km away
  15. 2.16 km W of Cobb, California · 14413 days ago · 3 km deep · 1 km away
  16. 2.14 km SW of Cobb, California · 14413 days ago · 0 km deep · 5 km away
  17. 2.25 km W of Cobb, California · 14413 days ago · 1 km deep · 2 km away
  18. 1.65 km SW of Cobb, California · 14412 days ago · -1 km deep · 6 km away
  19. 1.54 km SW of Cobb, California · 14412 days ago · 0 km deep · 6 km away
  20. 1.79 km WNW of Cobb, California · 14412 days ago · 1 km deep · 3 km away
  21. 1.76 km W of Cobb, California · 14411 days ago · 2 km deep · 0 km away
  22. 1.64 km SW of Cobb, California · 14410 days ago · 0 km deep · 6 km away
  23. 2.35 km SW of Cobb, California · 14410 days ago · 1 km deep · 5 km away
  24. 1.513 km NNE of Angwin, California · 14409 days ago · 4 km deep · 39 km away
  25. 1.76 km WSW of Cobb, California · 14409 days ago · 4 km deep · 3 km away
  26. 2.27 km WSW of Cobb, California · 14409 days ago · 1 km deep · 3 km away
  27. 2.38 km WSW of Cobb, California · 14409 days ago · 1 km deep · 3 km away
  28. 2.86 km W of Cobb, California · 14409 days ago · 2 km deep · 1 km away
  29. 2.17 km W of Cobb, California · 14408 days ago · 3 km deep · 1 km away
  30. 1.512 km NE of Lucerne, California · 14408 days ago · 13 km deep · 40 km away
  31. 1.811 km NNE of Geyserville, California · 14408 days ago · 3 km deep · 5 km away
  32. 1.77 km W of Cobb, California · 14407 days ago · 3 km deep · 2 km away
  33. 1.76 km W of Cobb, California · 14407 days ago · 4 km deep · 1 km away
  34. 1.84 km W of Moskowite Corner, California · 14407 days ago · 7 km deep · 65 km away
  35. 1.76 km WSW of Cobb, California · 14407 days ago · 1 km deep · 2 km away
  36. 1.87 km W of Cobb, California · 14406 days ago · 3 km deep · 1 km away
  37. 1.74 km SSW of Cobb, California · 14406 days ago · -1 km deep · 7 km away
  38. 2.15 km WNW of Cobb, California · 14405 days ago · 0 km deep · 1 km away
  39. 1.65 km W of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  40. 1.65 km W of Cobb, California · 14405 days ago · -1 km deep · 2 km away
  41. 2.47 km WSW of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  42. 2.2Northern California · 14405 days ago · 2 km deep · 5 km away
  43. 1.56 km W of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  44. 1.75 km WNW of Cobb, California · 14405 days ago · 1 km deep · 2 km away
  45. 1.85 km WNW of Cobb, California · 14404 days ago · 1 km deep · 1 km away
  46. 2.85 km SW of Cobb, California · 14404 days ago · 2 km deep · 5 km away
  47. 1.86 km W of Cobb, California · 14404 days ago · 3 km deep · 1 km away
  48. 2.10 km SSW of Kelseyville, California · 14403 days ago · 4 km deep · 17 km away
  49. 1.70 km SSW of Kelseyville, California · 14403 days ago · 4 km deep · 17 km away
  50. 1.60 km N of Kelseyville, California · 14403 days ago · 4 km deep · 17 km away
  51. 2.7Northern California · 14403 days ago · 4 km deep · 17 km away
  52. 2.0Northern California · 14403 days ago · 4 km deep · 17 km away
  53. 1.80 km N of Kelseyville, California · 14403 days ago · 3 km deep · 17 km away
  54. 2.80 km WSW of Kelseyville, California · 14403 days ago · 3 km deep · 17 km away
  55. 1.70 km WSW of Kelseyville, California · 14403 days ago · 4 km deep · 17 km away
  56. 2.8Northern California · 14403 days ago · 4 km deep · 17 km away
  57. 1.80 km N of Kelseyville, California · 14403 days ago · 3 km deep · 17 km away
  58. 1.70 km NNW of Kelseyville, California · 14403 days ago · 2 km deep · 17 km away
  59. 1.77 km WSW of Cobb, California · 14403 days ago · 3 km deep · 3 km away
  60. 1.615 km ENE of Potter Valley, California · 14403 days ago · 6 km deep · 61 km away

The first 60 of 175.

Before

  1. 1.95 km W of Cobb, California · 14417 days ago · 1 km deep · 2 km away
  2. 2.47 km W of Cobb, California · 14417 days ago · 1 km deep · 1 km away
  3. 2.66 km W of Cobb, California · 14418 days ago · 3 km deep · 1 km away
  4. 1.64 km WSW of Cobb, California · 14419 days ago · 2 km deep · 3 km away
  5. 1.67 km ENE of Talmage, California · 14419 days ago · 4 km deep · 45 km away
  6. 1.720 km ENE of Potter Valley, California · 14419 days ago · 7 km deep · 64 km away
  7. 1.83 km SW of Cobb, California · 14420 days ago · 0 km deep · 6 km away
  8. 1.76 km ENE of Willits, California · 14420 days ago · 3 km deep · 79 km away
  9. 2.36 km ENE of Willits, California · 14420 days ago · 3 km deep · 79 km away
  10. 2.56 km ENE of Willits, California · 14420 days ago · 3 km deep · 79 km away
  11. 2.86 km ENE of Willits, California · 14420 days ago · 3 km deep · 79 km away
  12. 1.56 km ENE of Willits, California · 14420 days ago · 4 km deep · 79 km away
  13. 1.76 km ENE of Willits, California · 14420 days ago · 3 km deep · 79 km away
  14. 2.96 km ENE of Willits, California · 14420 days ago · 4 km deep · 79 km away
  15. 1.8Northern California · 14420 days ago · 6 km deep · 28 km away
  16. 2.45 km WNW of Cobb, California · 14420 days ago · 1 km deep · 2 km away
  17. 1.611 km S of Kelseyville, California · 14421 days ago · 0 km deep · 7 km away
  18. 1.65 km SW of Cobb, California · 14421 days ago · 0 km deep · 6 km away
  19. 1.68 km WSW of Cobb, California · 14421 days ago · 3 km deep · 4 km away
  20. 1.66 km W of Cobb, California · 14422 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc98443. Read Thu, Oct 1, 2026, 11:44 AM UTC.