California earthquakes

M1.5 earthquake 4 km SW of Cobb, California

A magnitude 1.5 earthquake struck 4 km SW of Cobb, California on Fri, Sep 11, 1987, 2:41 PM PDT (21:41 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.4 4 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.

Open the live map with earthquakes

The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-09-11 21:41:04 UTC
Depth
-0.2 km (-0.1 mi), shallow
Epicenter
38.789° N, 122.757° 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, 0.8 km in depth
Magnitude uncertainty
±0.21
Depth from
From location
Station coverage gap
75°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 102 in the 30 days before it.

After

  1. 2.410 km W of Cobb, California · 14267 days ago · 1 km deep · 8 km away
  2. 1.64 km SW of Cobb, California · 14267 days ago · 0 km deep · 0 km away
  3. 1.58 km NW of Redwood Valley, California · 14266 days ago · 4 km deep · 74 km away
  4. 2.07 km W of Cobb, California · 14265 days ago · 3 km deep · 6 km away
  5. 1.96 km WSW of Cobb, California · 14265 days ago · 3 km deep · 4 km away
  6. 1.76 km WSW of Cobb, California · 14265 days ago · 3 km deep · 4 km away
  7. 2.822 km NE of Potter Valley, California · 14265 days ago · 12 km deep · 76 km away
  8. 1.921 km NE of Potter Valley, California · 14265 days ago · 11 km deep · 76 km away
  9. 2.56 km SW of Cobb, California · 14265 days ago · 2 km deep · 2 km away
  10. 2.46 km WSW of Cobb, California · 14265 days ago · 0 km deep · 2 km away
  11. 1.58 km W of Cobb, California · 14265 days ago · -1 km deep · 7 km away
  12. 2.921 km NE of Potter Valley, California · 14265 days ago · 10 km deep · 77 km away
  13. 1.922 km NE of Potter Valley, California · 14265 days ago · 10 km deep · 77 km away
  14. 1.721 km NE of Potter Valley, California · 14265 days ago · 11 km deep · 77 km away
  15. 1.921 km NE of Potter Valley, California · 14265 days ago · 11 km deep · 77 km away
  16. 3.024 km NE of Potter Valley, California · 14264 days ago · -1 km deep · 77 km away
  17. 1.64 km W of Cobb, California · 14264 days ago · 0 km deep · 4 km away
  18. 1.63 km NNW of Cloverdale, California · 14264 days ago · -1 km deep · 24 km away
  19. 1.98 km WSW of Cobb, California · 14264 days ago · 3 km deep · 5 km away
  20. 1.95 km WSW of Cobb, California · 14263 days ago · 1 km deep · 3 km away
  21. 1.64 km W of Cobb, California · 14263 days ago · -1 km deep · 4 km away
  22. 1.86 km W of Cobb, California · 14263 days ago · 1 km deep · 4 km away
  23. 2.39 km SE of Sonoma, California · 14262 days ago · 7 km deep · 70 km away
  24. 2.15 km WSW of Cobb, California · 14262 days ago · 1 km deep · 3 km away
  25. 1.69 km WSW of Cobb, California · 14262 days ago · 0 km deep · 6 km away
  26. 1.94 km W of Cobb, California · 14262 days ago · 1 km deep · 4 km away
  27. 1.74 km W of Cobb, California · 14262 days ago · 0 km deep · 4 km away
  28. 1.52 km NNE of Cloverdale, California · 14262 days ago · 0 km deep · 22 km away
  29. 1.617 km N of Upper Lake, California · 14261 days ago · 1 km deep · 60 km away
  30. 1.65 km SW of Cobb, California · 14261 days ago · -1 km deep · 1 km away
  31. 2.018 km NE of Potter Valley, California · 14260 days ago · 6 km deep · 77 km away
  32. 1.76 km W of Cobb, California · 14260 days ago · 1 km deep · 6 km away
  33. 2.55 km SW of Cobb, California · 14260 days ago · 1 km deep · 1 km away
  34. 2.46 km W of Cobb, California · 14260 days ago · 2 km deep · 5 km away
  35. 1.98 km W of Cobb, California · 14259 days ago · -1 km deep · 7 km away
  36. 2.58 km W of Cobb, California · 14259 days ago · 1 km deep · 6 km away
  37. 1.93 km NNW of Cloverdale, California · 14259 days ago · -1 km deep · 24 km away
  38. 1.97 km WSW of Cobb, California · 14258 days ago · 1 km deep · 5 km away
  39. 3.44 km W of Cobb, California · 14258 days ago · 2 km deep · 5 km away
  40. 1.77 km W of Cobb, California · 14258 days ago · -1 km deep · 7 km away
  41. 1.55 km WNW of Cobb, California · 14258 days ago · 1 km deep · 5 km away
  42. 1.77 km WSW of Cobb, California · 14257 days ago · 2 km deep · 5 km away
  43. 2.05 km WSW of Cobb, California · 14256 days ago · 1 km deep · 2 km away
  44. 1.74 km SE of Clear Lake Riviera, California · 14256 days ago · 7 km deep · 17 km away
  45. 1.97 km W of Cobb, California · 14256 days ago · 3 km deep · 5 km away
  46. 2.06 km WSW of Cobb, California · 14256 days ago · 1 km deep · 4 km away
  47. 2.77 km WSW of Cobb, California · 14255 days ago · 3 km deep · 4 km away
  48. 1.78 km W of Cobb, California · 14255 days ago · 1 km deep · 7 km away
  49. 1.711 km W of Cobb, California · 14254 days ago · 4 km deep · 9 km away
  50. 2.15 km SW of Cobb, California · 14254 days ago · 0 km deep · 1 km away
  51. 3.05 km SW of Cobb, California · 14254 days ago · 0 km deep · 1 km away
  52. 1.86 km WSW of Cobb, California · 14254 days ago · 0 km deep · 4 km away
  53. 1.76 km SW of Cobb, California · 14254 days ago · 0 km deep · 2 km away
  54. 1.65 km WSW of Cobb, California · 14253 days ago · 0 km deep · 3 km away
  55. 2.25 km SSW of Cobb, California · 14253 days ago · 12 km deep · 2 km away
  56. 2.55 km W of Cobb, California · 14253 days ago · 3 km deep · 5 km away
  57. 2.97 km WSW of Cobb, California · 14252 days ago · 1 km deep · 5 km away
  58. 1.77 km WSW of Cobb, California · 14252 days ago · 1 km deep · 4 km away
  59. 1.86 km WSW of Cobb, California · 14251 days ago · 0 km deep · 4 km away
  60. 1.54 km WSW of Cobb, California · 14251 days ago · 0 km deep · 2 km away

The first 60 of 159.

Before

  1. 1.76 km W of Cobb, California · 14267 days ago · 4 km deep · 6 km away
  2. 1.66 km W of Cobb, California · 14267 days ago · 3 km deep · 5 km away
  3. 2.86 km W of Cobb, California · 14267 days ago · 3 km deep · 5 km away
  4. 2.16 km W of Cobb, California · 14267 days ago · 3 km deep · 5 km away
  5. 1.73 km WNW of Cobb, California · 14267 days ago · 0 km deep · 5 km away
  6. 1.65 km SW of Cobb, California · 14268 days ago · 0 km deep · 1 km away
  7. 1.96 km SW of Middletown, California · 14268 days ago · 4 km deep · 11 km away
  8. 2.06 km WSW of Cobb, California · 14268 days ago · 3 km deep · 4 km away
  9. 1.96 km SW of Cobb, California · 14269 days ago · 2 km deep · 2 km away
  10. 1.54 km WNW of Cobb, California · 14269 days ago · 2 km deep · 5 km away
  11. 1.64 km SW of Cobb, California · 14269 days ago · 1 km deep · 1 km away
  12. 1.85 km SW of Cobb, California · 14270 days ago · 0 km deep · 2 km away
  13. 2.36 km WSW of Cobb, California · 14270 days ago · 1 km deep · 3 km away
  14. 2.38 km W of Cobb, California · 14271 days ago · 1 km deep · 6 km away
  15. 1.77 km W of Cobb, California · 14271 days ago · 0 km deep · 6 km away
  16. 1.56 km W of Cobb, California · 14272 days ago · 3 km deep · 5 km away
  17. 2.06 km W of Cobb, California · 14272 days ago · -1 km deep · 5 km away
  18. 1.824 km NNE of Potter Valley, California · 14272 days ago · 6 km deep · 84 km away
  19. 2.71 km E of Willits, California · 14273 days ago · 5 km deep · 85 km away
  20. 1.79 km WNW of Cobb, California · 14273 days ago · 0 km deep · 9 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc105683. Read Sat, Oct 3, 2026, 6:44 PM UTC.