California earthquakes

M2.1 earthquake 9 km W of Cobb, California

A magnitude 2.1 earthquake struck 9 km W of Cobb, California on Thu, Feb 19, 1987, 9:40 AM PST (17:40 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M2.5 18 km ENE of Potter Valley, 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.

Open the live map with earthquakes

The earthquake

Magnitude
2.1 (md), micro
Local time
UTC
1987-02-19 17:40:20 UTC
Depth
1.2 km (0.7 mi), shallow
Epicenter
38.808° N, 122.828° 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, 0.5 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
49°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.918 km ENE of Potter Valley, California · 14450 days ago · 7 km deep · 61 km away
  2. 1.95 km WSW of Cobb, California · 14450 days ago · 1 km deep · 5 km away
  3. 1.68 km WSW of Cobb, California · 14450 days ago · 0 km deep · 1 km away
  4. 1.66 km WSW of Cobb, California · 14450 days ago · 3 km deep · 2 km away
  5. 2.09 km W of Cobb, California · 14449 days ago · -1 km deep · 1 km away
  6. 2.518 km ENE of Potter Valley, California · 14449 days ago · 6 km deep · 63 km away
  7. 2.14 km SW of Cobb, California · 14448 days ago · 1 km deep · 7 km away
  8. 2.3Northern California · 14447 days ago · 1 km deep · 4 km away
  9. 1.77 km W of Cobb, California · 14447 days ago · 0 km deep · 2 km away
  10. 2.07 km WSW of Cobb, California · 14446 days ago · 1 km deep · 2 km away
  11. 1.72 km SSE of Clear Lake Riviera, CA · 14446 days ago · -1 km deep · 18 km away
  12. 2.64 km W of Cobb, California · 14446 days ago · 1 km deep · 5 km away
  13. 1.75 km W of Cobb, California · 14446 days ago · 1 km deep · 5 km away
  14. 1.76 km W of Cobb, California · 14445 days ago · 3 km deep · 3 km away
  15. 1.78 km WSW of Cobb, California · 14445 days ago · 3 km deep · 1 km away
  16. 2.611 km SE of Hopland, California · 14445 days ago · 4 km deep · 20 km away
  17. 2.88 km W of Cobb, California · 14445 days ago · -1 km deep · 1 km away
  18. 1.610 km ENE of Hidden Valley Lake, California · 14445 days ago · 2 km deep · 32 km away
  19. 1.96 km W of Cobb, California · 14445 days ago · 1 km deep · 3 km away
  20. 1.65 km WSW of Cobb, California · 14444 days ago · 1 km deep · 4 km away
  21. 2.27 km W of Cobb, California · 14444 days ago · 1 km deep · 1 km away
  22. 1.76 km W of Cobb, California · 14444 days ago · 3 km deep · 3 km away
  23. 2.48 km W of Cobb, California · 14443 days ago · 1 km deep · 1 km away
  24. 1.93 km WSW of Anchor Bay, California · 14443 days ago · 8 km deep · 69 km away
  25. 1.95 km SW of Cobb, California · 14443 days ago · 0 km deep · 5 km away
  26. 1.64 km WSW of Cobb, California · 14442 days ago · 1 km deep · 5 km away
  27. 1.98 km WSW of Cobb, California · 14442 days ago · 3 km deep · 2 km away
  28. 1.56 km SW of Cobb, California · 14442 days ago · 3 km deep · 5 km away
  29. 1.6Northern California · 14441 days ago · 1 km deep · 5 km away
  30. 1.7Northern California · 14441 days ago · 2 km deep · 2 km away
  31. 2.37 km WSW of Cobb, California · 14441 days ago · 1 km deep · 2 km away
  32. 2.816 km NE of Upper Lake, California · 14441 days ago · 3 km deep · 53 km away
  33. 2.117 km NE of Upper Lake, California · 14441 days ago · 6 km deep · 53 km away
  34. 2.06 km SW of Cobb, California · 14441 days ago · 1 km deep · 5 km away
  35. 1.67 km WSW of Cobb, California · 14440 days ago · 1 km deep · 2 km away
  36. 2.416 km NE of Upper Lake, California · 14440 days ago · 6 km deep · 53 km away
  37. 1.67 km WNW of Geyserville, California · 14440 days ago · 2 km deep · 14 km away
  38. 2.37 km W of Cobb, California · 14440 days ago · 3 km deep · 2 km away
  39. 2.26 km WSW of Cobb, California · 14439 days ago · 3 km deep · 3 km away
  40. 2.912 km ESE of Hidden Valley Lake, California · 14439 days ago · 9 km deep · 35 km away
  41. 1.512 km ESE of Hidden Valley Lake, California · 14439 days ago · 5 km deep · 35 km away
  42. 1.68 km WSW of Cobb, California · 14439 days ago · 2 km deep · 2 km away
  43. 1.86 km WSW of Cobb, California · 14439 days ago · 1 km deep · 3 km away
  44. 1.56 km W of Cobb, California · 14439 days ago · 3 km deep · 3 km away
  45. 3.09 km WSW of Cobb, California · 14438 days ago · 3 km deep · 1 km away
  46. 2.89 km WSW of Cobb, California · 14438 days ago · 2 km deep · 1 km away
  47. 1.65 km N of Novato, California · 14438 days ago · 2 km deep · 76 km away
  48. 2.17 km WSW of Cobb, California · 14437 days ago · 2 km deep · 2 km away
  49. 1.55 km SW of Cobb, California · 14437 days ago · 2 km deep · 5 km away
  50. 2.07 km E of Clearlake Oaks, California · 14437 days ago · 1 km deep · 32 km away
  51. 1.76 km WSW of Cobb, California · 14437 days ago · 1 km deep · 3 km away
  52. 2.4Northern California · 14436 days ago · 3 km deep · 2 km away
  53. 2.47 km WSW of Cobb, California · 14436 days ago · 1 km deep · 2 km away
  54. 2.26 km W of Cobb, California · 14436 days ago · 2 km deep · 3 km away
  55. 1.99 km W of Cobb, California · 14435 days ago · 1 km deep · 1 km away
  56. 1.66 km W of Cobb, California · 14435 days ago · 3 km deep · 3 km away
  57. 1.64 km SW of Cobb, California · 14435 days ago · 0 km deep · 6 km away
  58. 1.88 km S of Cobb, California · 14435 days ago · -1 km deep · 12 km away
  59. 2.85 km SW of Cobb, California · 14434 days ago · 0 km deep · 7 km away
  60. 2.06 km WSW of Cobb, California · 14434 days ago · 4 km deep · 3 km away

The first 60 of 172.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc95051. Read Tue, Sep 22, 2026, 10:23 PM UTC.