California earthquakes

M3.1 earthquake 6 km W of Cobb, California

A magnitude 3.1 earthquake struck 6 km W of Cobb, California on Fri, Oct 9, 1987, 2:05 AM PDT (09:05 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.1 7 km WNW 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.

Open the live map with earthquakes

The earthquake

Magnitude
3.1 (md), minor
Local time
UTC
1987-10-09 09:05:06 UTC
Depth
4.2 km (2.6 mi), shallow
Epicenter
38.821° N, 122.798° 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, 0.3 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
38°
Stations used
39

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 0 in the 30 days before it.

After

  1. 1.75 km E of Lower Lake, California · 14218 days ago · 8 km deep · 24 km away
  2. 2.54 km WSW of Cobb, California · 14218 days ago · 1 km deep · 3 km away
  3. 1.65 km W of Cobb, California · 14217 days ago · 0 km deep · 1 km away
  4. 2.05 km W of Cobb, California · 14217 days ago · 1 km deep · 1 km away
  5. 1.68 km WSW of Cobb, California · 14217 days ago · 1 km deep · 3 km away
  6. 1.78 km W of Cobb, California · 14217 days ago · -1 km deep · 2 km away
  7. 2.03 km SSE of Philo, California · 14217 days ago · 5 km deep · 60 km away
  8. 2.34 km NNE of Hopland, California · 14216 days ago · 3 km deep · 33 km away
  9. 2.03 km NW of Santa Rosa, California · 14216 days ago · 7 km deep · 40 km away
  10. 2.08 km W of Cobb, California · 14216 days ago · 1 km deep · 2 km away
  11. 1.88 km WSW of Upper Lake, California · 14216 days ago · 8 km deep · 39 km away
  12. 1.87 km WSW of Cobb, California · 14215 days ago · 3 km deep · 2 km away
  13. 2.77 km W of Cobb, California · 14215 days ago · -1 km deep · 1 km away
  14. 1.66 km W of Cobb, California · 14215 days ago · -1 km deep · 1 km away
  15. 1.69 km WNW of Cobb, California · 14214 days ago · 2 km deep · 4 km away
  16. 2.06 km W of Cobb, California · 14214 days ago · 2 km deep · 0 km away
  17. 1.54 km NNE of Clearlake, California · 14214 days ago · -1 km deep · 25 km away
  18. 2.05 km WNW of Cobb, California · 14214 days ago · 3 km deep · 3 km away
  19. 1.95 km SW of Cobb, California · 14214 days ago · 0 km deep · 4 km away
  20. 2.15 km SW of Cobb, California · 14214 days ago · 3 km deep · 4 km away
  21. 1.513 km ESE of Hidden Valley Lake, California · 14213 days ago · 3 km deep · 34 km away
  22. 2.312 km ESE of Hidden Valley Lake, California · 14213 days ago · 6 km deep · 33 km away
  23. 2.412 km ESE of Hidden Valley Lake, California · 14213 days ago · 6 km deep · 32 km away
  24. 2.45 km WSW of Cobb, California · 14213 days ago · 0 km deep · 3 km away
  25. 1.63 km NNW of Cloverdale, California · 14212 days ago · -1 km deep · 20 km away
  26. 2.321 km NE of Potter Valley, California · 14212 days ago · 11 km deep · 73 km away
  27. 1.9Northern California · 14212 days ago · 7 km deep · 30 km away
  28. 1.66 km WNW of Cobb, California · 14211 days ago · -1 km deep · 2 km away
  29. 1.75 km WNW of Cobb, California · 14210 days ago · 0 km deep · 3 km away
  30. 1.98 km WSW of Cobb, California · 14210 days ago · 2 km deep · 3 km away
  31. 1.922 km NE of Potter Valley, California · 14209 days ago · 11 km deep · 73 km away
  32. 1.56 km W of Cobb, California · 14209 days ago · -1 km deep · 0 km away
  33. 1.86 km W of Cobb, California · 14209 days ago · 1 km deep · 1 km away
  34. 1.66 km SW of Cobb, California · 14209 days ago · 1 km deep · 4 km away
  35. 1.57 km WSW of Cobb, California · 14208 days ago · 3 km deep · 2 km away
  36. 1.79 km W of Cobb, California · 14208 days ago · 1 km deep · 3 km away
  37. 2.67 km WSW of Cobb, California · 14208 days ago · 1 km deep · 2 km away
  38. 1.79 km WSW of Cobb, California · 14208 days ago · 2 km deep · 4 km away
  39. 1.76 km W of Cobb, California · 14208 days ago · -1 km deep · 0 km away
  40. 1.67 km W of Cobb, California · 14208 days ago · -1 km deep · 1 km away
  41. 1.67 km W of Cobb, California · 14208 days ago · 1 km deep · 1 km away
  42. 2.46 km W of Cobb, California · 14208 days ago · 1 km deep · 1 km away
  43. 1.65 km WSW of Cobb, California · 14208 days ago · 1 km deep · 3 km away
  44. 1.85 km WSW of Cobb, California · 14208 days ago · 0 km deep · 3 km away
  45. 3.17 km WNW of Cobb, California · 14207 days ago · -1 km deep · 2 km away
  46. 2.06 km W of Cobb, California · 14207 days ago · -1 km deep · 1 km away
  47. 1.66 km SW of Cobb, California · 14207 days ago · -1 km deep · 5 km away
  48. 1.66 km SW of Cobb, California · 14206 days ago · -1 km deep · 5 km away
  49. 2.31 km SSW of Redwood Valley, California · 14206 days ago · 6 km deep · 60 km away
  50. 3.25 km SW of Cobb, California · 14205 days ago · 0 km deep · 4 km away
  51. 1.85 km SW of Cobb, California · 14205 days ago · -1 km deep · 4 km away
  52. 3.05 km SW of Cobb, California · 14205 days ago · 0 km deep · 4 km away
  53. 1.56 km SW of Cobb, California · 14205 days ago · -1 km deep · 5 km away
  54. 1.76 km SW of Cobb, California · 14205 days ago · 0 km deep · 5 km away
  55. 1.81 km SSE of Calpella, California · 14205 days ago · 3 km deep · 57 km away
  56. 1.69 km W of Cobb, California · 14204 days ago · 2 km deep · 4 km away
  57. 2.26 km W of Cobb, California · 14204 days ago · 3 km deep · 1 km away
  58. 1.7Northern California · 14204 days ago · 0 km deep · 1 km away
  59. 1.67 km W of Cobb, California · 14203 days ago · 3 km deep · 1 km away
  60. 1.87 km WSW of Cobb, California · 14203 days ago · 1 km deep · 2 km away

The first 60 of 168.

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc106970 (also filed as usp000393m). Read Thu, Sep 24, 2026, 8:49 AM UTC.