California earthquakes

M1.8 earthquake 7 km W of Cobb, California

A magnitude 1.8 earthquake struck 7 km W of Cobb, California on Wed, Jun 20, 1990, 10:40 PM PDT (05:40 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.2 6 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-06-21 05:40:54 UTC
Depth
3.2 km (2.0 mi), shallow
Epicenter
38.821° N, 122.806° 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
±0.06
Depth from
From location
Station coverage gap
42°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 80 in the 30 days before it.

After

  1. 2.925 km NE of Potter Valley, CA · 13254 days ago · 9 km deep · 77 km away
  2. 1.68 km W of Cobb, CA · 13254 days ago · -1 km deep · 1 km away
  3. 1.76 km SW of Cobb, California · 13254 days ago · 0 km deep · 5 km away
  4. 1.74 km SW of Cobb, California · 13253 days ago · -1 km deep · 6 km away
  5. 1.64 km SW of Cobb, California · 13253 days ago · 0 km deep · 6 km away
  6. 1.55 km ESE of Boonville, California · 13253 days ago · 9 km deep · 48 km away
  7. 1.58 km NNE of Geyserville, California · 13253 days ago · 15 km deep · 6 km away
  8. 2.17 km W of Cobb, California · 13253 days ago · 4 km deep · 1 km away
  9. 1.64 km S of Cobb, California · 13252 days ago · 2 km deep · 8 km away
  10. 2.06 km SW of Cobb, California · 13252 days ago · 0 km deep · 5 km away
  11. 2.09 km SE of Willits, California · 13252 days ago · 1 km deep · 72 km away
  12. 1.68 km W of Cobb, California · 13252 days ago · 0 km deep · 1 km away
  13. 1.910 km ESE of Willits, California · 13252 days ago · 4 km deep · 71 km away
  14. 1.911 km NE of Angwin, California · 13251 days ago · 6 km deep · 45 km away
  15. 2.07 km E of Clearlake Oaks, California · 13250 days ago · -1 km deep · 29 km away
  16. 2.17 km WSW of Cobb, California · 13250 days ago · 4 km deep · 3 km away
  17. 1.97 km E of Clearlake Oaks, California · 13250 days ago · -1 km deep · 29 km away
  18. 1.66 km E of Clearlake Oaks, California · 13250 days ago · -1 km deep · 30 km away
  19. 1.67 km NE of Clearlake, California · 13250 days ago · 2 km deep · 29 km away
  20. 2.56 km W of Cobb, California · 13249 days ago · 3 km deep · 0 km away
  21. 1.512 km ENE of Cloverdale, California · 13249 days ago · 1 km deep · 9 km away
  22. 2.812 km ENE of Cloverdale, California · 13249 days ago · 1 km deep · 9 km away
  23. 2.06 km SW of Cobb, California · 13249 days ago · 0 km deep · 6 km away
  24. 2.64 km SSW of Cobb, California · 13249 days ago · 0 km deep · 7 km away
  25. 1.66 km WSW of Cobb, California · 13249 days ago · 0 km deep · 3 km away
  26. 1.73 km E of Sonoma, California · 13248 days ago · 4 km deep · 68 km away
  27. 1.66 km NE of Hopland, California · 13247 days ago · 3 km deep · 30 km away
  28. 1.87 km W of Cobb, California · 13247 days ago · 3 km deep · 1 km away
  29. 1.54 km NNE of Talmage, California · 13247 days ago · 7 km deep · 48 km away
  30. 1.93 km SW of Cobb, California · 13246 days ago · 2 km deep · 6 km away
  31. 2.59 km W of Cobb, California · 13246 days ago · 1 km deep · 3 km away
  32. 1.810 km W of Cobb, California · 13246 days ago · -1 km deep · 3 km away
  33. 1.910 km W of Cobb, California · 13246 days ago · 0 km deep · 3 km away
  34. 2.47 km WSW of Cobb, California · 13245 days ago · 2 km deep · 3 km away
  35. 2.46 km SW of Cobb, California · 13245 days ago · -1 km deep · 4 km away
  36. 1.69 km W of Cobb, California · 13245 days ago · 2 km deep · 2 km away
  37. 2.05 km W of Cobb, California · 13244 days ago · 2 km deep · 1 km away
  38. 2.83 km SSW of Cobb, California · 13244 days ago · 1 km deep · 6 km away
  39. 1.88 km W of Cobb, California · 13244 days ago · 0 km deep · 1 km away
  40. 2.09 km SSE of Potter Valley, California · 13244 days ago · 4 km deep · 52 km away
  41. 2.29 km WNW of Cobb, California · 13244 days ago · 2 km deep · 3 km away
  42. 1.95 km WSW of Cobb, California · 13244 days ago · 0 km deep · 3 km away
  43. 1.78 km WSW of Cobb, California · 13243 days ago · 0 km deep · 2 km away
  44. 2.96 km W of Allendale, California · 13243 days ago · 2 km deep · 80 km away
  45. 1.88 km W of Cobb, California · 13242 days ago · 1 km deep · 2 km away
  46. 3.08 km W of Cobb, California · 13242 days ago · 0 km deep · 2 km away
  47. 1.58 km WNW of Cobb, California · 13242 days ago · 2 km deep · 2 km away
  48. 1.88 km W of Cobb, California · 13242 days ago · 1 km deep · 2 km away
  49. 1.54 km W of Cobb, California · 13241 days ago · 0 km deep · 3 km away
  50. 1.810 km W of Cobb, California · 13240 days ago · 1 km deep · 3 km away
  51. 2.05 km WSW of Cobb, California · 13239 days ago · 3 km deep · 2 km away
  52. 2.55 km W of Cobb, California · 13238 days ago · 2 km deep · 1 km away
  53. 1.95 km W of Cobb, California · 13238 days ago · 0 km deep · 1 km away
  54. 1.99 km E of Hidden Valley Lake, California · 13237 days ago · 7 km deep · 31 km away
  55. 2.04 km WNW of Potter Valley, California · 13237 days ago · 2 km deep · 65 km away
  56. 1.97 km WSW of Cobb, California · 13236 days ago · 3 km deep · 3 km away
  57. 1.615 km N of Upper Lake, California · 13236 days ago · 7 km deep · 55 km away
  58. 1.77 km W of Cobb, California · 13236 days ago · 0 km deep · 1 km away
  59. 1.79 km ESE of Hopland, California · 13235 days ago · 2 km deep · 23 km away
  60. 2.310 km N of Cloverdale, California · 13235 days ago · 2 km deep · 19 km away

The first 60 of 176.

Before

  1. 1.76 km SW of Cobb, California · 13254 days ago · 1 km deep · 6 km away
  2. 1.75 km SW of Cobb, California · 13254 days ago · -1 km deep · 6 km away
  3. 2.112 km SSW of Kelseyville, California · 13254 days ago · 2 km deep · 9 km away
  4. 1.73 km WNW of Cobb, California · 13255 days ago · 1 km deep · 4 km away
  5. 1.9Northern California · 13255 days ago · 4 km deep · 1 km away
  6. 1.64 km N of Larkfield-Wikiup, California · 13255 days ago · 5 km deep · 30 km away
  7. 1.78 km E of Potter Valley, California · 13256 days ago · 2 km deep · 60 km away
  8. 2.08 km ENE of Potter Valley, California · 13256 days ago · 5 km deep · 60 km away
  9. 2.85 km WSW of Cobb, California · 13257 days ago · 2 km deep · 4 km away
  10. 2.38 km W of Cobb, California · 13257 days ago · 0 km deep · 1 km away
  11. 2.010 km NNE of Larkfield-Wikiup, California · 13257 days ago · 5 km deep · 27 km away
  12. 1.58 km W of Cobb, California · 13258 days ago · 0 km deep · 1 km away
  13. 1.913 km NNW of Moskowite Corner, California · 13258 days ago · 3 km deep · 57 km away
  14. 2.07 km W of Cobb, California · 13259 days ago · 3 km deep · 1 km away
  15. 1.819 km ENE of Potter Valley, California · 13260 days ago · 8 km deep · 62 km away
  16. 1.92 km SW of Cobb, California · 13261 days ago · 1 km deep · 6 km away
  17. 2.45 km SW of Cobb, California · 13261 days ago · 1 km deep · 4 km away
  18. 1.93 km SW of Moskowite Corner, California · 13261 days ago · 8 km deep · 68 km away
  19. 1.54 km SSW of Cobb, California · 13261 days ago · 0 km deep · 6 km away
  20. 2.16 km W of Cobb, California · 13262 days ago · 0 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc159894. Read Sun, Oct 4, 2026, 2:40 PM UTC.