California earthquakes

M1.8 earthquake 17 km NNE of Angwin, California

A magnitude 1.8 earthquake struck 17 km NNE of Angwin, California on Sun, Jul 19, 1987, 1:55 PM PDT (20:55 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M1.9 5 km NW of Green Valley, California. This one was a foreshock.

Angwin 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
1.8 (md), micro
Local time
UTC
1987-07-19 20:55:44 UTC
Depth
6.4 km (3.9 mi), shallow
Epicenter
38.725° N, 122.387° 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 0.4 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
140°
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 169 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.64 km W of Cobb, California · 14298 days ago · 0 km deep · 36 km away
  2. 1.95 km NW of Green Valley, California · 14298 days ago · 4 km deep · 51 km away
  3. 1.76 km W of Cobb, California · 14298 days ago · 3 km deep · 37 km away
  4. 1.67 km W of Cobb, California · 14297 days ago · 1 km deep · 39 km away
  5. 1.94 km SW of Cobb, California · 14297 days ago · 1 km deep · 34 km away
  6. 1.86 km W of Cobb, California · 14297 days ago · 3 km deep · 37 km away
  7. 2.46 km W of Cobb, California · 14297 days ago · 3 km deep · 37 km away
  8. 1.66 km SW of Glen Ellen, California · 14297 days ago · 8 km deep · 47 km away
  9. 1.85 km WNW of Cobb, California · 14296 days ago · 3 km deep · 36 km away
  10. 2.05 km W of Cobb, California · 14296 days ago · 1 km deep · 37 km away
  11. 1.73 km W of Cobb, California · 14296 days ago · 0 km deep · 35 km away
  12. 2.06 km WSW of Cobb, California · 14296 days ago · 3 km deep · 37 km away
  13. 2.05 km WSW of Cobb, California · 14295 days ago · 1 km deep · 35 km away
  14. 1.76 km WSW of Cobb, California · 14295 days ago · -1 km deep · 36 km away
  15. 1.95 km W of Cobb, California · 14294 days ago · 1 km deep · 37 km away
  16. 2.14 km WSW of Cobb, California · 14293 days ago · 1 km deep · 34 km away
  17. 1.64 km WSW of Cobb, California · 14293 days ago · 1 km deep · 35 km away
  18. 1.64 km WSW of Cobb, California · 14293 days ago · 1 km deep · 35 km away
  19. 1.75 km WSW of Cobb, California · 14292 days ago · 1 km deep · 35 km away
  20. 1.59 km W of Cobb, California · 14292 days ago · 1 km deep · 40 km away
  21. 2.35 km WSW of Cobb, California · 14292 days ago · 0 km deep · 35 km away
  22. 2.05 km WSW of Cobb, California · 14292 days ago · -1 km deep · 36 km away
  23. 1.66 km W of Cobb, California · 14290 days ago · 3 km deep · 37 km away
  24. 1.86 km WSW of Cobb, California · 14290 days ago · 3 km deep · 37 km away
  25. 1.78 km W of Cobb, California · 14289 days ago · 1 km deep · 39 km away
  26. 2.01 km N of Pittsburg, California · 14289 days ago · 20 km deep · 88 km away
  27. 1.65 km W of Cobb, California · 14289 days ago · 0 km deep · 37 km away
  28. 1.65 km W of Cobb, California · 14289 days ago · 0 km deep · 36 km away
  29. 1.64 km WSW of Cobb, California · 14289 days ago · 1 km deep · 34 km away
  30. 1.66 km W of Cobb, California · 14288 days ago · 3 km deep · 37 km away
  31. 1.86 km SW of Cobb, California · 14288 days ago · 1 km deep · 34 km away
  32. 1.86 km SW of Cobb, California · 14288 days ago · 1 km deep · 34 km away
  33. 1.75 km W of Cobb, California · 14288 days ago · -1 km deep · 37 km away
  34. 1.67 km W of Cobb, California · 14287 days ago · 1 km deep · 38 km away
  35. 1.86 km SW of Cobb, California · 14287 days ago · 0 km deep · 34 km away
  36. 1.86 km WSW of Cobb, California · 14286 days ago · 0 km deep · 37 km away
  37. 1.86 km WSW of Cobb, California · 14286 days ago · 1 km deep · 36 km away
  38. 1.66 km W of Cobb, California · 14286 days ago · 2 km deep · 37 km away
  39. 1.83 km N of Cloverdale, California · 14286 days ago · 0 km deep · 57 km away
  40. 1.66 km SW of Cobb, California · 14286 days ago · 0 km deep · 34 km away
  41. 1.57 km WSW of Cobb, California · 14286 days ago · 3 km deep · 37 km away
  42. 1.87 km WSW of Cobb, California · 14285 days ago · 1 km deep · 37 km away
  43. 1.79 km SE of Boonville, California · 14285 days ago · 7 km deep · 81 km away
  44. 1.56 km W of Cobb, California · 14285 days ago · 2 km deep · 37 km away
  45. 1.55 km WNW of Cobb, California · 14285 days ago · 1 km deep · 37 km away
  46. 1.74 km W of Cobb, California · 14285 days ago · 1 km deep · 35 km away
  47. 2.27 km W of Cobb, California · 14284 days ago · 4 km deep · 38 km away
  48. 1.84 km SW of Cobb, California · 14284 days ago · 0 km deep · 34 km away
  49. 1.87 km W of Cobb, California · 14284 days ago · 1 km deep · 39 km away
  50. 1.87 km WSW of Cobb, California · 14284 days ago · 2 km deep · 37 km away
  51. 1.97 km WSW of Cobb, California · 14283 days ago · 1 km deep · 38 km away
  52. 1.72 km SSW of Clearlake, California · 14283 days ago · 3 km deep · 32 km away
  53. 1.8Northern California · 14282 days ago · 1 km deep · 39 km away
  54. 1.59 km ESE of Hidden Valley Lake, California · 14282 days ago · 5 km deep · 8 km away
  55. 1.91 km W of Green Valley, California · 14282 days ago · 10 km deep · 55 km away
  56. 2.15 km SW of Cobb, California · 14282 days ago · 2 km deep · 34 km away
  57. 2.06 km W of Cobb, California · 14282 days ago · 4 km deep · 38 km away
  58. 1.65 km W of Cobb, California · 14282 days ago · 1 km deep · 36 km away
  59. 1.63 km NNW of Cloverdale, California · 14281 days ago · -1 km deep · 57 km away
  60. 1.75 km WSW of Cobb, California · 14281 days ago · 0 km deep · 35 km away

The first 60 of 169.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1151249. Read Wed, Sep 23, 2026, 5:02 AM UTC.