California earthquakes

M1.9 earthquake 7 km WSW of Cobb, California

A magnitude 1.9 earthquake struck 7 km WSW of Cobb, California on Sun, Sep 20, 1987, 8:56 AM PDT (15:56 UTC), 1 km (1 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.

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The earthquake

Magnitude
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-09-20 15:56:58 UTC
Depth
1.4 km (0.9 mi), shallow
Epicenter
38.802° N, 122.809° 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 0.5 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
193°, poorly surrounded by stations
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: 158 in the 60 days after this one and 106 in the 30 days before it.

After

  1. 3.44 km W of Cobb, California · 14257 days ago · 2 km deep · 4 km away
  2. 1.77 km W of Cobb, California · 14257 days ago · -1 km deep · 3 km away
  3. 1.55 km WNW of Cobb, California · 14257 days ago · 1 km deep · 4 km away
  4. 1.77 km WSW of Cobb, California · 14256 days ago · 2 km deep · 1 km away
  5. 2.05 km WSW of Cobb, California · 14255 days ago · 1 km deep · 3 km away
  6. 1.74 km SE of Clear Lake Riviera, California · 14255 days ago · 7 km deep · 18 km away
  7. 1.97 km W of Cobb, California · 14255 days ago · 3 km deep · 1 km away
  8. 2.06 km WSW of Cobb, California · 14255 days ago · 1 km deep · 1 km away
  9. 2.77 km WSW of Cobb, California · 14255 days ago · 3 km deep · 0 km away
  10. 1.78 km W of Cobb, California · 14254 days ago · 1 km deep · 2 km away
  11. 1.711 km W of Cobb, California · 14253 days ago · 4 km deep · 4 km away
  12. 2.15 km SW of Cobb, California · 14253 days ago · 0 km deep · 5 km away
  13. 3.05 km SW of Cobb, California · 14253 days ago · 0 km deep · 5 km away
  14. 1.86 km WSW of Cobb, California · 14253 days ago · 0 km deep · 2 km away
  15. 1.76 km SW of Cobb, California · 14253 days ago · 0 km deep · 4 km away
  16. 1.65 km WSW of Cobb, California · 14252 days ago · 0 km deep · 2 km away
  17. 2.25 km SSW of Cobb, California · 14252 days ago · 12 km deep · 5 km away
  18. 2.55 km W of Cobb, California · 14252 days ago · 3 km deep · 3 km away
  19. 2.97 km WSW of Cobb, California · 14251 days ago · 1 km deep · 1 km away
  20. 1.77 km WSW of Cobb, California · 14251 days ago · 1 km deep · 1 km away
  21. 1.86 km WSW of Cobb, California · 14251 days ago · 0 km deep · 1 km away
  22. 2.62 km ESE of Mendocino, California · 14251 days ago · 26 km deep · 99 km away
  23. 1.54 km WSW of Cobb, California · 14250 days ago · 0 km deep · 4 km away
  24. 3.05 km SW of Cobb, California · 14249 days ago · 0 km deep · 4 km away
  25. 3.25 km SW of Cobb, California · 14249 days ago · 0 km deep · 4 km away
  26. 1.64 km N of Clear Lake Riviera, California · 14248 days ago · 1 km deep · 23 km away
  27. 2.011 km W of Cobb, California · 14248 days ago · 2 km deep · 4 km away
  28. 2.06 km W of Cobb, California · 14248 days ago · 3 km deep · 2 km away
  29. 1.710 km W of Cobb, California · 14248 days ago · 1 km deep · 5 km away
  30. 1.57 km W of Cobb, California · 14247 days ago · 3 km deep · 1 km away
  31. 1.86 km WSW of Cobb, California · 14246 days ago · 4 km deep · 2 km away
  32. 1.96 km S of Clear Lake Riviera, California · 14246 days ago · -1 km deep · 13 km away
  33. 2.19 km W of Cobb, California · 14246 days ago · 0 km deep · 2 km away
  34. 1.75 km WSW of Cobb, California · 14246 days ago · -1 km deep · 3 km away
  35. 1.54 km SW of Kenwood, California · 14245 days ago · 2 km deep · 50 km away
  36. 1.85 km W of Cobb, California · 14244 days ago · 1 km deep · 2 km away
  37. 1.77 km W of Cobb, California · 14244 days ago · 0 km deep · 3 km away
  38. 2.112 km NE of Philo, California · 14244 days ago · -1 km deep · 62 km away
  39. 1.57 km W of Cobb, California · 14244 days ago · 3 km deep · 2 km away
  40. 1.74 km WSW of Cobb, California · 14243 days ago · 2 km deep · 4 km away
  41. 1.57 km W of Cobb, California · 14243 days ago · 0 km deep · 3 km away
  42. 1.7Northern California · 14242 days ago · 2 km deep · 50 km away
  43. 1.56 km WNW of Cobb, California · 14242 days ago · 0 km deep · 4 km away
  44. 1.71 km ENE of American Canyon, California · 14241 days ago · 9 km deep · 85 km away
  45. 3.16 km W of Cobb, California · 14241 days ago · 3 km deep · 2 km away
  46. 1.611 km WNW of Calistoga, California · 14241 days ago · 7 km deep · 23 km away
  47. 1.72 km NNW of Clear Lake Riviera, California · 14241 days ago · 8 km deep · 20 km away
  48. 2.04 km SW of Hopland, California · 14239 days ago · 4 km deep · 34 km away
  49. 3.16 km W of Cobb, California · 14239 days ago · 4 km deep · 2 km away
  50. 1.86 km W of Cobb, California · 14239 days ago · 3 km deep · 2 km away
  51. 1.54 km WSW of Cobb, California · 14238 days ago · 1 km deep · 3 km away
  52. 1.56 km W of Cobb, California · 14238 days ago · 3 km deep · 3 km away
  53. 2.16 km SW of Cobb, California · 14238 days ago · 1 km deep · 4 km away
  54. 1.67 km W of Cobb, California · 14237 days ago · 1 km deep · 3 km away
  55. 1.85 km WSW of Cobb, California · 14237 days ago · 0 km deep · 3 km away
  56. 1.94 km NW of Philo, California · 14237 days ago · -1 km deep · 66 km away
  57. 1.59 km WSW of Cobb, California · 14237 days ago · 1 km deep · 1 km away
  58. 2.3Northern California · 14237 days ago · 1 km deep · 3 km away
  59. 2.37 km NNE of Hopland, California · 14236 days ago · 1 km deep · 34 km away
  60. 1.96 km W of Cobb, California · 14236 days ago · 3 km deep · 2 km away

The first 60 of 158.

Before

  1. 1.93 km NNW of Cloverdale, California · 14258 days ago · -1 km deep · 19 km away
  2. 2.58 km W of Cobb, California · 14259 days ago · 1 km deep · 2 km away
  3. 1.98 km W of Cobb, California · 14259 days ago · -1 km deep · 3 km away
  4. 2.46 km W of Cobb, California · 14259 days ago · 2 km deep · 2 km away
  5. 2.55 km SW of Cobb, California · 14259 days ago · 1 km deep · 4 km away
  6. 1.76 km W of Cobb, California · 14259 days ago · 1 km deep · 3 km away
  7. 2.018 km NE of Potter Valley, California · 14259 days ago · 6 km deep · 74 km away
  8. 1.65 km SW of Cobb, California · 14260 days ago · -1 km deep · 5 km away
  9. 1.617 km N of Upper Lake, California · 14260 days ago · 1 km deep · 58 km away
  10. 1.52 km NNE of Cloverdale, California · 14261 days ago · 0 km deep · 18 km away
  11. 1.74 km W of Cobb, California · 14261 days ago · 0 km deep · 4 km away
  12. 1.94 km W of Cobb, California · 14261 days ago · 1 km deep · 4 km away
  13. 1.69 km WSW of Cobb, California · 14261 days ago · 0 km deep · 1 km away
  14. 2.15 km WSW of Cobb, California · 14261 days ago · 1 km deep · 2 km away
  15. 2.39 km SE of Sonoma, California · 14262 days ago · 7 km deep · 73 km away
  16. 1.86 km W of Cobb, California · 14262 days ago · 1 km deep · 2 km away
  17. 1.64 km W of Cobb, California · 14262 days ago · -1 km deep · 3 km away
  18. 1.95 km WSW of Cobb, California · 14262 days ago · 1 km deep · 3 km away
  19. 1.98 km WSW of Cobb, California · 14263 days ago · 3 km deep · 1 km away
  20. 1.63 km NNW of Cloverdale, California · 14263 days ago · -1 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc106077. Read Fri, Oct 2, 2026, 11:01 PM UTC.