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, Feb 2, 1978, 3:47 PM PST (23:47 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M2.2 9 km NNW of Redwood Valley, 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
1978-02-02 23:47:43 UTC
Depth
-0.3 km (-0.2 mi), shallow
Epicenter
38.830° N, 122.793° 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, 0.6 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
50°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 192 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 2.29 km NNW of Redwood Valley, California · 17762 days ago · 7 km deep · 70 km away
  2. 2.31 km W of Angwin, California · 17762 days ago · 8 km deep · 40 km away
  3. 2.89 km NNE of Brooktrails, California · 17762 days ago · 4 km deep · 89 km away
  4. 2.418 km NE of Upper Lake, California · 17761 days ago · 3 km deep · 52 km away
  5. 1.84 km WSW of Cobb, California · 17760 days ago · 1 km deep · 3 km away
  6. 2.27 km NNE of Hopland, California · 17760 days ago · 1 km deep · 33 km away
  7. 2.27 km NE of Hopland, California · 17760 days ago · 2 km deep · 32 km away
  8. 1.67 km W of Cobb, California · 17760 days ago · 0 km deep · 2 km away
  9. 2.74 km ESE of Willits, California · 17759 days ago · 2 km deep · 77 km away
  10. 2.54 km ESE of Willits, California · 17758 days ago · 2 km deep · 77 km away
  11. 2.012 km ESE of Hidden Valley Lake, California · 17755 days ago · 3 km deep · 32 km away
  12. 1.66 km WSW of Cobb, California · 17754 days ago · 4 km deep · 2 km away
  13. 2.08 km ESE of Talmage, California · 17754 days ago · 8 km deep · 39 km away
  14. 2.37 km NNE of Nice, California · 17754 days ago · 7 km deep · 40 km away
  15. 2.46 km W of Cobb, California · 17754 days ago · 2 km deep · 2 km away
  16. 2.16 km W of Cobb, California · 17754 days ago · -1 km deep · 2 km away
  17. 2.56 km W of Cobb, California · 17752 days ago · 3 km deep · 1 km away
  18. 2.85 km ESE of Santa Rosa, California · 17752 days ago · 9 km deep · 47 km away
  19. 2.55 km ESE of Santa Rosa, California · 17752 days ago · 9 km deep · 47 km away
  20. 2.09 km ESE of Black Point-Green Point, California · 17750 days ago · 11 km deep · 89 km away
  21. 1.66 km W of Cobb, California · 17749 days ago · 1 km deep · 2 km away
  22. 1.811 km NE of Healdsburg, California · 17749 days ago · 4 km deep · 18 km away
  23. 1.610 km ESE of Hidden Valley Lake, California · 17748 days ago · 4 km deep · 30 km away
  24. 1.77 km W of Cobb, California · 17747 days ago · 3 km deep · 1 km away
  25. 1.76 km W of Cobb, California · 17746 days ago · -1 km deep · 0 km away
  26. 2.319 km SW of Stonyford, California · 17745 days ago · 9 km deep · 49 km away
  27. 2.48 km NNE of Hopland, California · 17744 days ago · 3 km deep · 35 km away
  28. 1.88 km S of Calistoga, California · 17743 days ago · 6 km deep · 41 km away
  29. 2.416 km NE of Nice, California · 17741 days ago · 7 km deep · 45 km away
  30. 2.46 km ESE of Willits, California · 17740 days ago · 6 km deep · 75 km away
  31. 2.111 km NE of Healdsburg, California · 17740 days ago · 5 km deep · 18 km away
  32. 1.610 km NE of Healdsburg, California · 17739 days ago · 4 km deep · 18 km away
  33. 2.411 km NNW of Potter Valley, California · 17739 days ago · 1 km deep · 73 km away
  34. 1.820 km WSW of Stonyford, CA · 17738 days ago · -1 km deep · 56 km away
  35. 1.83 km S of Clear Lake Riviera, California · 17738 days ago · 2 km deep · 12 km away
  36. 1.6Northern California · 17737 days ago · 3 km deep · 2 km away
  37. 1.66 km W of Cobb, California · 17737 days ago · 3 km deep · 1 km away
  38. 2.13 km SW of Calpella, California · 17737 days ago · 11 km deep · 56 km away
  39. 2.03 km SW of Calpella, California · 17737 days ago · 8 km deep · 57 km away
  40. 2.19 km NNW of Redwood Valley, California · 17737 days ago · 5 km deep · 70 km away
  41. 1.87 km W of Cobb, California · 17732 days ago · 0 km deep · 3 km away
  42. 1.66 km SSE of Boonville, California · 17732 days ago · 6 km deep · 48 km away
  43. 1.96 km W of Cobb, California · 17732 days ago · 3 km deep · 1 km away
  44. 2.53 km ENE of Willits, California · 17731 days ago · 3 km deep · 79 km away
  45. 1.82 km E of Forestville, California · 17730 days ago · 2 km deep · 40 km away
  46. 1.87 km N of Princeton, California · 17729 days ago · 18 km deep · 98 km away
  47. 2.26 km W of Cobb, California · 17728 days ago · 3 km deep · 2 km away
  48. 2.49 km N of Cloverdale, California · 17728 days ago · 5 km deep · 19 km away
  49. 1.77 km W of Cobb, California · 17727 days ago · 1 km deep · 1 km away
  50. 1.77 km WSW of Cobb, California · 17727 days ago · 2 km deep · 3 km away
  51. 2.07 km WSW of Cobb, California · 17725 days ago · -1 km deep · 3 km away
  52. 2.57 km W of Cobb, California · 17724 days ago · 3 km deep · 2 km away
  53. 1.64 km WSW of Cobb, California · 17723 days ago · -1 km deep · 3 km away
  54. 1.719 km NE of Sea Ranch, California · 17722 days ago · 1 km deep · 42 km away
  55. 2.03 km W of Glen Ellen, California · 17722 days ago · 9 km deep · 56 km away
  56. 1.716 km N of Cazadero, California · 17721 days ago · 0 km deep · 33 km away
  57. 1.67 km W of Cobb, California · 17718 days ago · 3 km deep · 2 km away
  58. 1.75 km N of Healdsburg, California · 17716 days ago · 5 km deep · 21 km away
  59. 1.77 km WSW of Middletown, California · 17713 days ago · 2 km deep · 13 km away
  60. 2.47 km WSW of Middletown, California · 17713 days ago · 2 km deep · 13 km away

The first 60 of 192.

Before

  1. 2.08 km S of Calistoga, California · 17765 days ago · 7 km deep · 41 km away
  2. 3.15 km ESE of Willits, California · 17766 days ago · 2 km deep · 77 km away
  3. 1.96 km W of Cobb, California · 17766 days ago · 4 km deep · 1 km away
  4. 3.017 km NE of Lucerne, California · 17767 days ago · 6 km deep · 43 km away
  5. 1.56 km WSW of Cobb, California · 17768 days ago · 0 km deep · 3 km away
  6. 1.97 km SW of Calistoga, California · 17768 days ago · 5 km deep · 36 km away
  7. 2.95 km ENE of Willits, California · 17769 days ago · 0 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038826. Read Tue, Sep 22, 2026, 9:13 AM UTC.