California earthquakes

M1.5 earthquake 8 km W of Cobb, California

A magnitude 1.5 earthquake struck 8 km W of Cobb, California on Thu, Sep 1, 1977, 10:19 PM PDT (05:19 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.8 10 km NE of Healdsburg, 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-09-02 05:19:39 UTC
Depth
-0.2 km (-0.1 mi), shallow
Epicenter
38.812° N, 122.822° 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, 0.5 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
75°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 2.07 km W of Cobb, California · 17930 days ago · 3 km deep · 1 km away
  2. 1.87 km ENE of Larkfield-Wikiup, California · 17930 days ago · 5 km deep · 34 km away
  3. 1.817 km NE of Nice, California · 17929 days ago · 8 km deep · 47 km away
  4. 2.814 km NNE of Lucerne, California · 17929 days ago · 8 km deep · 45 km away
  5. 2.715 km NNE of Lucerne, California · 17929 days ago · 9 km deep · 46 km away
  6. 2.714 km NNE of Lucerne, California · 17929 days ago · 7 km deep · 45 km away
  7. 2.615 km NNE of Lucerne, California · 17929 days ago · 9 km deep · 45 km away
  8. 1.816 km NNE of Lucerne, California · 17929 days ago · 7 km deep · 46 km away
  9. 3.79 km E of American Canyon, California · 17927 days ago · 10 km deep · 92 km away
  10. 2.48 km E of American Canyon, California · 17925 days ago · 4 km deep · 92 km away
  11. 3.610 km NE of Healdsburg, California · 17925 days ago · 6 km deep · 17 km away
  12. 1.710 km NE of Healdsburg, California · 17925 days ago · 5 km deep · 17 km away
  13. 2.310 km NE of Healdsburg, California · 17924 days ago · 5 km deep · 17 km away
  14. 1.811 km NE of Healdsburg, California · 17924 days ago · 6 km deep · 17 km away
  15. 2.110 km NE of Healdsburg, California · 17924 days ago · 6 km deep · 17 km away
  16. 1.810 km NE of Healdsburg, California · 17924 days ago · 6 km deep · 17 km away
  17. 2.67 km WSW of Cobb, California · 17924 days ago · 0 km deep · 2 km away
  18. 1.711 km NE of Healdsburg, California · 17923 days ago · 5 km deep · 17 km away
  19. 2.811 km NE of Healdsburg, California · 17923 days ago · 6 km deep · 17 km away
  20. 1.66 km W of Cobb, California · 17922 days ago · 3 km deep · 2 km away
  21. 1.811 km NE of Healdsburg, California · 17921 days ago · 6 km deep · 16 km away
  22. 3.59 km NE of Healdsburg, California · 17921 days ago · 6 km deep · 16 km away
  23. 1.910 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 16 km away
  24. 1.910 km NE of Healdsburg, California · 17921 days ago · 6 km deep · 17 km away
  25. 2.410 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 16 km away
  26. 2.310 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 16 km away
  27. 1.810 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 17 km away
  28. 1.910 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 17 km away
  29. 3.38 km E of American Canyon, California · 17921 days ago · 4 km deep · 92 km away
  30. 3.810 km NE of Healdsburg, California · 17921 days ago · 6 km deep · 17 km away
  31. 2.39 km S of Green Valley, California · 17921 days ago · 2 km deep · 92 km away
  32. 1.811 km NE of Healdsburg, California · 17921 days ago · 5 km deep · 17 km away
  33. 1.54 km NE of Santa Rosa, California · 17920 days ago · 8 km deep · 40 km away
  34. 1.910 km NE of Healdsburg, California · 17920 days ago · 6 km deep · 16 km away
  35. 2.19 km N of Cloverdale, California · 17920 days ago · 5 km deep · 18 km away
  36. 2.410 km NE of Healdsburg, California · 17919 days ago · 4 km deep · 16 km away
  37. 2.210 km NE of Healdsburg, California · 17919 days ago · 2 km deep · 15 km away
  38. 1.711 km NE of Healdsburg, California · 17919 days ago · 5 km deep · 16 km away
  39. 1.84 km WSW of Cobb, California · 17919 days ago · 4 km deep · 5 km away
  40. 2.511 km NE of Healdsburg, California · 17919 days ago · 5 km deep · 16 km away
  41. 1.512 km NE of Healdsburg, California · 17919 days ago · 4 km deep · 16 km away
  42. 1.811 km NE of Healdsburg, California · 17919 days ago · 5 km deep · 16 km away
  43. 2.28 km W of Cobb, California · 17917 days ago · -1 km deep · 0 km away
  44. 2.27 km W of Cobb, California · 17917 days ago · 3 km deep · 2 km away
  45. 2.07 km W of Cobb, California · 17917 days ago · 3 km deep · 2 km away
  46. 1.811 km ENE of Healdsburg, California · 17916 days ago · 6 km deep · 17 km away
  47. 1.511 km ENE of Healdsburg, California · 17916 days ago · 6 km deep · 17 km away
  48. 1.711 km NE of Healdsburg, California · 17916 days ago · 5 km deep · 16 km away
  49. 2.111 km NE of Healdsburg, California · 17916 days ago · 5 km deep · 16 km away
  50. 2.411 km NE of Healdsburg, California · 17915 days ago · 5 km deep · 16 km away
  51. 2.111 km NE of Healdsburg, California · 17914 days ago · 5 km deep · 15 km away
  52. 1.711 km NE of Healdsburg, California · 17914 days ago · 5 km deep · 16 km away
  53. 2.111 km NE of Healdsburg, California · 17914 days ago · 5 km deep · 15 km away
  54. 1.86 km W of Cobb, California · 17913 days ago · 1 km deep · 2 km away
  55. 2.53 km WSW of Calpella, California · 17913 days ago · 10 km deep · 58 km away
  56. 1.63 km NNW of Middletown, California · 17913 days ago · 6 km deep · 17 km away
  57. 2.87 km WSW of Cobb, California · 17912 days ago · 2 km deep · 2 km away
  58. 1.97 km W of Cobb, California · 17911 days ago · 4 km deep · 1 km away
  59. 1.87 km WSW of Cobb, California · 17911 days ago · 3 km deep · 2 km away
  60. 1.6Northern California · 17911 days ago · 8 km deep · 28 km away

The first 60 of 107.

Before

  1. 1.97 km W of Cobb, California · 17931 days ago · 0 km deep · 1 km away
  2. 1.97 km WSW of Kenwood, California · 17931 days ago · 10 km deep · 50 km away
  3. 2.97 km WSW of Kenwood, California · 17932 days ago · 11 km deep · 49 km away
  4. 2.016 km NE of Upper Lake, California · 17932 days ago · 2 km deep · 50 km away
  5. 2.33 km S of Geyserville, California · 17932 days ago · 6 km deep · 16 km away
  6. 1.58 km W of Cobb, California · 17933 days ago · 0 km deep · 1 km away
  7. 1.60 km S of Clearlake, California · 17933 days ago · 5 km deep · 23 km away
  8. 2.87 km NNW of Redwood Valley, California · 17934 days ago · 11 km deep · 67 km away
  9. 1.68 km WSW of Cobb, California · 17936 days ago · 3 km deep · 1 km away
  10. 1.56 km ESE of Hopland, California · 17936 days ago · 6 km deep · 24 km away
  11. 2.619 km NE of Nice, California · 17938 days ago · 10 km deep · 51 km away
  12. 1.9Northern California · 17939 days ago · 0 km deep · 0 km away
  13. 1.78 km W of Cobb, California · 17939 days ago · 0 km deep · 0 km away
  14. 1.76 km W of Cobb, California · 17940 days ago · 3 km deep · 2 km away
  15. 1.96 km WSW of Cobb, California · 17941 days ago · -1 km deep · 2 km away
  16. 1.96 km WSW of Cobb, California · 17941 days ago · 0 km deep · 3 km away
  17. 2.16 km WSW of Cobb, California · 17941 days ago · 1 km deep · 2 km away
  18. 2.06 km WSW of Cobb, California · 17941 days ago · 1 km deep · 2 km away
  19. 2.89 km WSW of Cobb, CA · 17941 days ago · 1 km deep · 1 km away
  20. 1.68 km E of Hidden Valley Lake, California · 17943 days ago · 7 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1036596. Read Mon, Oct 5, 2026, 1:41 PM UTC.