California earthquakes

M1.7 earthquake 10 km WNW of Cobb, California

A magnitude 1.7 earthquake struck 10 km WNW of Cobb, California on Mon, Dec 31, 1990, 1:04 AM PST (09:04 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.7 7 km WSW 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
1990-12-31 09:04:25 UTC
Depth
0.9 km (0.6 mi), shallow
Epicenter
38.841° N, 122.837° 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
±0.08
Depth from
From location
Station coverage gap
40°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 182 in the 60 days after this one and 84 in the 30 days before it.

After

  1. 1.75 km SSW of Cobb, California · 13060 days ago · 1 km deep · 11 km away
  2. 1.79 km WNW of Cobb, California · 13058 days ago · 2 km deep · 1 km away
  3. 3.77 km WSW of Cobb, California · 13058 days ago · 4 km deep · 6 km away
  4. 1.66 km WSW of Cobb, California · 13058 days ago · 1 km deep · 7 km away
  5. 2.07 km WSW of Cobb, California · 13058 days ago · 1 km deep · 5 km away
  6. 2.48 km W of Cobb, California · 13058 days ago · 1 km deep · 3 km away
  7. 2.08 km W of Cobb, California · 13058 days ago · 1 km deep · 3 km away
  8. 1.930 km SE of Covelo, California · 13058 days ago · 10 km deep · 85 km away
  9. 1.86 km W of Cobb, California · 13057 days ago · 0 km deep · 4 km away
  10. 1.86 km W of Cobb, California · 13057 days ago · 0 km deep · 4 km away
  11. 1.64 km WSW of Cobb, California · 13057 days ago · 0 km deep · 7 km away
  12. 1.53 km ENE of Santa Rosa, California · 13057 days ago · 9 km deep · 45 km away
  13. 1.75 km SW of Cobb, California · 13056 days ago · -1 km deep · 8 km away
  14. 1.821 km ENE of Potter Valley, California · 13055 days ago · 6 km deep · 59 km away
  15. 1.65 km WSW of Cobb, California · 13055 days ago · 4 km deep · 7 km away
  16. 1.91 km W of American Canyon, California · 13054 days ago · 3 km deep · 89 km away
  17. 3.15 km WSW of Cobb, California · 13054 days ago · 0 km deep · 7 km away
  18. 1.85 km WSW of Cobb, California · 13054 days ago · 0 km deep · 7 km away
  19. 1.712 km ENE of Cloverdale, California · 13053 days ago · 1 km deep · 3 km away
  20. 1.713 km ENE of Cloverdale, California · 13053 days ago · 1 km deep · 3 km away
  21. 1.86 km WSW of Cobb, California · 13052 days ago · 1 km deep · 6 km away
  22. 1.67 km E of Calpella, California · 13052 days ago · 2 km deep · 51 km away
  23. 2.15 km W of Cobb, California · 13051 days ago · 0 km deep · 5 km away
  24. 1.6Northern California · 13051 days ago · 1 km deep · 3 km away
  25. 1.87 km W of Cobb, California · 13051 days ago · 4 km deep · 4 km away
  26. 1.77 km WSW of Cobb, California · 13051 days ago · 4 km deep · 6 km away
  27. 1.90 km SE of Hopland, California · 13050 days ago · 1 km deep · 27 km away
  28. 1.74 km W of Cobb, California · 13050 days ago · 2 km deep · 5 km away
  29. 1.56 km S of Cobb, California · 13050 days ago · 1 km deep · 14 km away
  30. 1.65 km WNW of Cobb, California · 13049 days ago · 1 km deep · 5 km away
  31. 1.89 km W of Cobb, California · 13049 days ago · 1 km deep · 1 km away
  32. 2.29 km W of Cobb, California · 13049 days ago · -1 km deep · 3 km away
  33. 2.38 km W of Cobb, California · 13049 days ago · 0 km deep · 3 km away
  34. 1.67 km WNW of Cobb, California · 13049 days ago · 1 km deep · 3 km away
  35. 1.74 km W of Cobb, California · 13049 days ago · 2 km deep · 6 km away
  36. 2.07 km S of Cobb, California · 13049 days ago · -1 km deep · 15 km away
  37. 1.89 km W of Cobb, California · 13048 days ago · 0 km deep · 2 km away
  38. 1.67 km W of Cobb, California · 13047 days ago · 4 km deep · 4 km away
  39. 1.97 km W of Cobb, California · 13047 days ago · 3 km deep · 3 km away
  40. 1.513 km ESE of Hidden Valley Lake, California · 13047 days ago · 5 km deep · 37 km away
  41. 1.57 km ENE of Larkfield-Wikiup, California · 13047 days ago · 23 km deep · 37 km away
  42. 1.719 km ENE of Potter Valley, California · 13046 days ago · 9 km deep · 60 km away
  43. 1.54 km WSW of Cobb, California · 13045 days ago · 2 km deep · 8 km away
  44. 1.68 km N of Cloverdale, California · 13045 days ago · 2 km deep · 16 km away
  45. 1.96 km SW of Calistoga, California · 13045 days ago · 6 km deep · 39 km away
  46. 2.23 km W of Cobb, California · 13045 days ago · 0 km deep · 6 km away
  47. 1.73 km W of Cobb, California · 13044 days ago · 0 km deep · 6 km away
  48. 2.59 km W of Cobb, California · 13044 days ago · 3 km deep · 3 km away
  49. 2.010 km W of Cobb, California · 13044 days ago · 1 km deep · 3 km away
  50. 1.57 km WNW of Cobb, California · 13044 days ago · 0 km deep · 4 km away
  51. 2.18 km S of Boonville, California · 13044 days ago · -1 km deep · 47 km away
  52. 1.75 km ENE of Grimes, California · 13043 days ago · 19 km deep · 91 km away
  53. 1.812 km NNE of Angwin, California · 13043 days ago · 6 km deep · 42 km away
  54. 1.72 km E of Hopland, California · 13042 days ago · 4 km deep · 26 km away
  55. 1.65 km WNW of Cobb, California · 13042 days ago · -1 km deep · 5 km away
  56. 1.74 km WSW of Cobb, California · 13040 days ago · 0 km deep · 7 km away
  57. 2.22 km SW of Cobb, California · 13040 days ago · 1 km deep · 9 km away
  58. 1.79 km W of Cobb, California · 13040 days ago · 0 km deep · 3 km away
  59. 1.67 km W of Cobb, California · 13040 days ago · 3 km deep · 4 km away
  60. 1.83 km SSW of Cobb, California · 13039 days ago · 1 km deep · 10 km away

The first 60 of 182.

Before

  1. 2.48 km WNW of Cobb, California · 13063 days ago · 0 km deep · 2 km away
  2. 1.63 km SSW of Cobb, California · 13064 days ago · 1 km deep · 10 km away
  3. 1.78 km WSW of Cobb, California · 13064 days ago · 0 km deep · 4 km away
  4. 1.95 km WSW of Cobb, California · 13065 days ago · 0 km deep · 7 km away
  5. 3.85 km SW of Cobb, California · 13065 days ago · 1 km deep · 9 km away
  6. 1.72 km E of Clearlake Oaks, California · 13065 days ago · -1 km deep · 27 km away
  7. 1.717 km E of Potter Valley, California · 13065 days ago · 6 km deep · 56 km away
  8. 2.07 km W of Cobb, California · 13065 days ago · 0 km deep · 2 km away
  9. 1.61 km E of Hopland, California · 13067 days ago · 3 km deep · 27 km away
  10. 1.718 km ENE of Potter Valley, California · 13067 days ago · 5 km deep · 58 km away
  11. 2.23 km WNW of Cobb, California · 13067 days ago · 1 km deep · 6 km away
  12. 2.63 km W of Cobb, California · 13067 days ago · 0 km deep · 7 km away
  13. 1.57 km WNW of Cobb, California · 13067 days ago · 0 km deep · 3 km away
  14. 1.6Northern California · 13067 days ago · 0 km deep · 13 km away
  15. 1.9Northern California · 13068 days ago · 1 km deep · 8 km away
  16. 1.6Northern California · 13068 days ago · 1 km deep · 2 km away
  17. 1.65 km N of Geyserville, California · 13068 days ago · 4 km deep · 10 km away
  18. 1.627 km NNE of Potter Valley, California · 13069 days ago · 10 km deep · 79 km away
  19. 2.06 km W of Cobb, California · 13070 days ago · 2 km deep · 4 km away
  20. 1.67 km S of Cobb, California · 13070 days ago · 1 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc203844. Read Sun, Oct 4, 2026, 4:52 PM UTC.