California earthquakes

M1.7 earthquake 5 km WSW of Cobb, California

A magnitude 1.7 earthquake struck 5 km WSW of Cobb, California on Mon, Aug 17, 1987, 11:11 PM PDT (06:11 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.

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The earthquake

Magnitude
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-08-18 06:11:45 UTC
Depth
-0.3 km (-0.2 mi), shallow
Epicenter
38.803° N, 122.776° 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, 0.4 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
51°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 162 in the 60 days after this one and 108 in the 30 days before it.

After

  1. 1.811 km SSW of Cloverdale, California · 14291 days ago · 4 km deep · 29 km away
  2. 1.64 km SW of Cobb, California · 14291 days ago · 0 km deep · 2 km away
  3. 2.58 km W of Cobb, California · 14290 days ago · 0 km deep · 4 km away
  4. 2.110 km ENE of Lucerne, California · 14290 days ago · 24 km deep · 38 km away
  5. 2.67 km W of Cobb, California · 14290 days ago · 3 km deep · 3 km away
  6. 2.16 km W of Cobb, California · 14290 days ago · 3 km deep · 3 km away
  7. 1.63 km NNW of Cloverdale, California · 14289 days ago · 2 km deep · 22 km away
  8. 1.96 km W of Cobb, California · 14288 days ago · -1 km deep · 4 km away
  9. 1.86 km W of Cobb, California · 14288 days ago · 0 km deep · 3 km away
  10. 1.96 km W of Cobb, California · 14288 days ago · 0 km deep · 3 km away
  11. 1.66 km W of Cobb, California · 14288 days ago · 1 km deep · 3 km away
  12. 1.75 km W of Cobb, California · 14288 days ago · 0 km deep · 3 km away
  13. 1.86 km W of Cobb, California · 14287 days ago · 3 km deep · 3 km away
  14. 2.16 km W of Cobb, California · 14287 days ago · 3 km deep · 3 km away
  15. 1.65 km WNW of Cobb, California · 14287 days ago · 1 km deep · 3 km away
  16. 2.9Northern California · 14287 days ago · 2 km deep · 8 km away
  17. 2.27 km WSW of Cobb, California · 14286 days ago · 0 km deep · 3 km away
  18. 1.87 km W of Cobb, California · 14286 days ago · 3 km deep · 3 km away
  19. 2.06 km WSW of Cobb, California · 14286 days ago · 1 km deep · 2 km away
  20. 2.14 km W of Cobb, California · 14286 days ago · 1 km deep · 3 km away
  21. 2.06 km WSW of Cobb, California · 14286 days ago · 1 km deep · 2 km away
  22. 1.711 km WNW of Redwood Valley, California · 14286 days ago · 6 km deep · 73 km away
  23. 2.17 km WSW of Cobb, California · 14286 days ago · 1 km deep · 3 km away
  24. 2.67 km W of Cobb, California · 14285 days ago · 0 km deep · 4 km away
  25. 1.88 km NW of Redwood Valley, California · 14285 days ago · 2 km deep · 71 km away
  26. 1.611 km N of Brooktrails, California · 14285 days ago · 6 km deep · 98 km away
  27. 1.64 km S of Cobb, California · 14284 days ago · -1 km deep · 5 km away
  28. 2.45 km SW of Cobb, California · 14284 days ago · 0 km deep · 3 km away
  29. 1.82 km WNW of Brooktrails, California · 14284 days ago · 2 km deep · 91 km away
  30. 1.86 km NE of Brooktrails, California · 14284 days ago · 5 km deep · 90 km away
  31. 1.79 km W of Cobb, California · 14283 days ago · -1 km deep · 5 km away
  32. 2.16 km E of Hidden Valley Lake, California · 14282 days ago · 14 km deep · 25 km away
  33. 2.18 km W of Cobb, California · 14282 days ago · 0 km deep · 5 km away
  34. 1.88 km W of Cobb, California · 14282 days ago · 0 km deep · 4 km away
  35. 2.38 km WSW of Cobb, California · 14282 days ago · 2 km deep · 4 km away
  36. 2.56 km W of Cobb, California · 14281 days ago · 1 km deep · 2 km away
  37. 2.26 km W of Cobb, California · 14281 days ago · 3 km deep · 2 km away
  38. 1.7Northern California · 14280 days ago · 0 km deep · 4 km away
  39. 2.37 km WSW of Cobb, California · 14280 days ago · 1 km deep · 3 km away
  40. 2.028 km NNE of Potter Valley, California · 14279 days ago · 13 km deep · 86 km away
  41. 2.05 km WNW of Cobb, California · 14279 days ago · 2 km deep · 4 km away
  42. 1.65 km SSW of Cobb, California · 14279 days ago · 0 km deep · 3 km away
  43. 2.14 km W of Cobb, California · 14279 days ago · 0 km deep · 2 km away
  44. 1.97 km W of Cobb, California · 14279 days ago · 3 km deep · 3 km away
  45. 2.05 km SSE of Kelseyville, California · 14277 days ago · 0 km deep · 15 km away
  46. 3.08 km W of Cobb, California · 14277 days ago · 1 km deep · 4 km away
  47. 2.06 km NNE of Penngrove, California · 14277 days ago · 4 km deep · 52 km away
  48. 1.76 km W of Cobb, California · 14277 days ago · 1 km deep · 3 km away
  49. 1.76 km W of Cobb, California · 14276 days ago · 3 km deep · 2 km away
  50. 1.87 km WSW of Cobb, California · 14276 days ago · 4 km deep · 3 km away
  51. 1.65 km SW of Cobb, California · 14276 days ago · -1 km deep · 2 km away
  52. 1.83 km NNW of Cloverdale, California · 14276 days ago · -1 km deep · 22 km away
  53. 1.67 km W of Cobb, California · 14276 days ago · 0 km deep · 4 km away
  54. 1.57 km WSW of Cobb, California · 14276 days ago · 1 km deep · 2 km away
  55. 1.97 km WSW of Cobb, California · 14275 days ago · 4 km deep · 3 km away
  56. 1.56 km W of Cobb, California · 14275 days ago · 3 km deep · 2 km away
  57. 2.026 km NNE of Potter Valley, California · 14275 days ago · 4 km deep · 85 km away
  58. 2.04 km W of Cobb, California · 14275 days ago · 0 km deep · 2 km away
  59. 2.05 km W of Cobb, California · 14274 days ago · 0 km deep · 2 km away
  60. 1.85 km W of Cobb, California · 14273 days ago · 0 km deep · 3 km away

The first 60 of 162.

Before

  1. 1.63 km NNW of Cloverdale, California · 14292 days ago · -1 km deep · 22 km away
  2. 1.65 km W of Cobb, California · 14292 days ago · 1 km deep · 3 km away
  3. 2.06 km W of Cobb, California · 14292 days ago · 4 km deep · 3 km away
  4. 2.15 km SW of Cobb, California · 14292 days ago · 2 km deep · 2 km away
  5. 1.91 km W of Green Valley, California · 14293 days ago · 10 km deep · 80 km away
  6. 1.59 km ESE of Hidden Valley Lake, California · 14293 days ago · 5 km deep · 28 km away
  7. 1.8Northern California · 14293 days ago · 1 km deep · 4 km away
  8. 1.72 km SSW of Clearlake, California · 14293 days ago · 3 km deep · 19 km away
  9. 1.97 km WSW of Cobb, California · 14294 days ago · 1 km deep · 3 km away
  10. 1.87 km WSW of Cobb, California · 14294 days ago · 2 km deep · 2 km away
  11. 1.87 km W of Cobb, California · 14295 days ago · 1 km deep · 4 km away
  12. 1.84 km SW of Cobb, California · 14295 days ago · 0 km deep · 1 km away
  13. 2.27 km W of Cobb, California · 14295 days ago · 4 km deep · 4 km away
  14. 1.74 km W of Cobb, California · 14295 days ago · 1 km deep · 1 km away
  15. 1.55 km WNW of Cobb, California · 14295 days ago · 1 km deep · 4 km away
  16. 1.56 km W of Cobb, California · 14296 days ago · 2 km deep · 2 km away
  17. 1.79 km SE of Boonville, California · 14296 days ago · 7 km deep · 47 km away
  18. 1.87 km WSW of Cobb, California · 14296 days ago · 1 km deep · 2 km away
  19. 1.57 km WSW of Cobb, California · 14296 days ago · 3 km deep · 3 km away
  20. 1.66 km SW of Cobb, California · 14297 days ago · 0 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc104738. Read Sat, Oct 3, 2026, 3:30 PM UTC.