California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Thu, Dec 20, 1979, 7:43 AM PST (15:43 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M1.8 9 km SE of Hopland, 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), micro
Local time
UTC
1979-12-20 15:43:11 UTC
Depth
0.7 km (0.4 mi), shallow
Epicenter
38.815° N, 122.802° 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, 0.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
77°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 123 in the 60 days after this one and 62 in the 30 days before it.

After

  1. 1.54 km WSW of Cobb, California · 17078 days ago · 1 km deep · 3 km away
  2. 1.67 km WSW of Cobb, California · 17076 days ago · 2 km deep · 1 km away
  3. 1.89 km SE of Hopland, California · 17076 days ago · 3 km deep · 23 km away
  4. 1.76 km W of Cobb, California · 17076 days ago · 4 km deep · 1 km away
  5. 1.76 km NNE of Dixon, California · 17075 days ago · 10 km deep · 95 km away
  6. 2.418 km E of Potter Valley, California · 17075 days ago · 4 km deep · 58 km away
  7. 1.75 km W of Cobb, California · 17074 days ago · 1 km deep · 2 km away
  8. 1.54 km WSW of Cobb, California · 17074 days ago · 1 km deep · 3 km away
  9. 1.57 km W of Cobb, California · 17074 days ago · 0 km deep · 1 km away
  10. 1.97 km WSW of Cobb, California · 17074 days ago · 1 km deep · 2 km away
  11. 1.94 km WSW of Cobb, California · 17073 days ago · 1 km deep · 3 km away
  12. 2.07 km W of Cobb, California · 17072 days ago · 1 km deep · 2 km away
  13. 2.27 km W of Cobb, California · 17072 days ago · 1 km deep · 1 km away
  14. 2.05 km W of Brooktrails, California · 17072 days ago · 5 km deep · 89 km away
  15. 1.89 km NW of Montalvin, California · 17072 days ago · 4 km deep · 91 km away
  16. 2.24 km WSW of Cobb, California · 17072 days ago · 2 km deep · 3 km away
  17. 1.54 km WSW of Cobb, California · 17071 days ago · 2 km deep · 3 km away
  18. 2.07 km WSW of Cobb, California · 17071 days ago · 0 km deep · 1 km away
  19. 1.99 km WSW of Cobb, California · 17071 days ago · 2 km deep · 3 km away
  20. 2.16 km NNE of Healdsburg, California · 17068 days ago · -1 km deep · 17 km away
  21. 2.16 km W of Cobb, California · 17068 days ago · 0 km deep · 2 km away
  22. 2.06 km W of Cobb, California · 17068 days ago · 3 km deep · 1 km away
  23. 1.99 km WSW of Cobb, California · 17067 days ago · 1 km deep · 3 km away
  24. 1.77 km WSW of Cobb, California · 17067 days ago · 1 km deep · 1 km away
  25. 1.74 km WSW of Cobb, California · 17066 days ago · 1 km deep · 3 km away
  26. 2.07 km WSW of Cobb, California · 17064 days ago · 2 km deep · 1 km away
  27. 1.69 km SW of Hopland, California · 17064 days ago · 1 km deep · 36 km away
  28. 1.74 km WSW of Cobb, California · 17062 days ago · 2 km deep · 3 km away
  29. 1.721 km NNE of Upper Lake, California · 17062 days ago · 4 km deep · 60 km away
  30. 1.65 km SSW of Clear Lake Riviera, California · 17062 days ago · 5 km deep · 11 km away
  31. 1.64 km WSW of Cobb, California · 17059 days ago · 1 km deep · 3 km away
  32. 2.19 km WSW of Cobb, California · 17058 days ago · 1 km deep · 3 km away
  33. 1.74 km N of Lucerne, California · 17058 days ago · 16 km deep · 35 km away
  34. 3.06 km NE of Santa Rosa, California · 17058 days ago · 7 km deep · 40 km away
  35. 2.16 km NE of Santa Rosa, California · 17058 days ago · 6 km deep · 40 km away
  36. 1.85 km WSW of Cobb, California · 17058 days ago · 0 km deep · 2 km away
  37. 2.36 km W of Cobb, California · 17057 days ago · 0 km deep · 1 km away
  38. 2.023 km NNE of Potter Valley, California · 17057 days ago · 9 km deep · 79 km away
  39. 1.614 km ENE of Hidden Valley Lake, California · 17056 days ago · 12 km deep · 34 km away
  40. 1.67 km NE of Philo, California · 17055 days ago · 0 km deep · 61 km away
  41. 1.74 km WSW of Cobb, California · 17055 days ago · 1 km deep · 3 km away
  42. 3.111 km NNW of Potter Valley, California · 17054 days ago · 12 km deep · 74 km away
  43. 2.110 km NNW of Potter Valley, California · 17053 days ago · 7 km deep · 73 km away
  44. 1.63 km WNW of Clear Lake Riviera, California · 17053 days ago · 10 km deep · 17 km away
  45. 1.56 km WSW of Cobb, California · 17053 days ago · 1 km deep · 1 km away
  46. 1.77 km WSW of Cobb, California · 17053 days ago · 0 km deep · 1 km away
  47. 1.77 km WSW of Cobb, California · 17052 days ago · 2 km deep · 1 km away
  48. 1.7Northern California · 17052 days ago · 8 km deep · 31 km away
  49. 1.710 km E of Geyserville, California · 17051 days ago · 15 km deep · 10 km away
  50. 1.76 km W of Cobb, California · 17050 days ago · 0 km deep · 1 km away
  51. 1.66 km ENE of Willits, California · 17049 days ago · 6 km deep · 79 km away
  52. 3.210 km E of Manchester, California · 17048 days ago · 9 km deep · 68 km away
  53. 1.611 km NNW of Potter Valley, California · 17048 days ago · 8 km deep · 74 km away
  54. 1.67 km WSW of Cobb, California · 17047 days ago · 2 km deep · 1 km away
  55. 1.67 km WSW of Cobb, California · 17047 days ago · 1 km deep · 1 km away
  56. 1.56 km W of Cobb, California · 17045 days ago · 1 km deep · 1 km away
  57. 1.65 km SW of Cobb, California · 17044 days ago · 1 km deep · 4 km away
  58. 1.78 km W of Cobb, California · 17044 days ago · 3 km deep · 2 km away
  59. 2.05 km SW of Clear Lake Riviera, California · 17044 days ago · 0 km deep · 12 km away
  60. 1.75 km SW of Clear Lake Riviera, California · 17044 days ago · -1 km deep · 12 km away

The first 60 of 123.

Before

  1. 1.910 km ESE of Willits, California · 17078 days ago · 11 km deep · 72 km away
  2. 1.88 km W of Cobb, California · 17079 days ago · 1 km deep · 1 km away
  3. 2.48 km WSW of Cobb, California · 17079 days ago · -1 km deep · 2 km away
  4. 3.07 km WSW of Cobb, California · 17079 days ago · 1 km deep · 1 km away
  5. 1.68 km W of Cobb, California · 17079 days ago · 1 km deep · 2 km away
  6. 1.66 km WSW of Cobb, California · 17079 days ago · 0 km deep · 2 km away
  7. 1.97 km NNE of Black Point-Green Point, California · 17080 days ago · 7 km deep · 76 km away
  8. 2.64 km WSW of Cobb, California · 17081 days ago · 4 km deep · 3 km away
  9. 1.74 km WSW of Cobb, California · 17081 days ago · 1 km deep · 3 km away
  10. 1.59 km WSW of Cobb, California · 17081 days ago · 2 km deep · 3 km away
  11. 1.67 km WSW of Cobb, California · 17084 days ago · 0 km deep · 1 km away
  12. 1.76 km W of Cobb, California · 17085 days ago · 0 km deep · 1 km away
  13. 1.78 km WNW of Cobb, California · 17085 days ago · 1 km deep · 4 km away
  14. 2.07 km WSW of Cobb, California · 17086 days ago · 0 km deep · 1 km away
  15. 1.77 km WSW of Cobb, California · 17086 days ago · 2 km deep · 1 km away
  16. 1.67 km WSW of Cobb, California · 17086 days ago · 1 km deep · 1 km away
  17. 2.08 km WSW of Cobb, California · 17087 days ago · 0 km deep · 2 km away
  18. 1.87 km W of Cobb, California · 17087 days ago · 1 km deep · 2 km away
  19. 1.96 km W of Cobb, California · 17087 days ago · 0 km deep · 1 km away
  20. 1.510 km W of Cobb, California · 17088 days ago · 1 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1049458. Read Tue, Sep 22, 2026, 8:47 PM UTC.