California earthquakes

M2.5 earthquake 8 km W of Cobb, California

A magnitude 2.5 earthquake struck 8 km W of Cobb, California on Fri, Jan 20, 1978, 2:37 PM PST (22:37 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.0 10 km ESE of Willits, 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
2.5 (md), micro
Local time
UTC
1978-01-20 22:37:34 UTC
Depth
0.7 km (0.4 mi), shallow
Epicenter
38.814° N, 122.815° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
71°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 52 in the 30 days before it.

After

  1. 3.010 km ESE of Willits, California · 17777 days ago · 5 km deep · 73 km away
  2. 1.710 km NW of Cobb, California · 17777 days ago · 1 km deep · 7 km away
  3. 1.65 km W of Cobb, California · 17776 days ago · 3 km deep · 3 km away
  4. 1.68 km WSW of Cobb, California · 17774 days ago · 1 km deep · 1 km away
  5. 2.46 km ESE of Willits, California · 17772 days ago · -1 km deep · 76 km away
  6. 1.511 km WNW of Cobb, California · 17772 days ago · 15 km deep · 6 km away
  7. 1.68 km W of Cobb, California · 17772 days ago · 0 km deep · 0 km away
  8. 2.07 km W of Cobb, California · 17772 days ago · 0 km deep · 0 km away
  9. 1.611 km ENE of Healdsburg, California · 17772 days ago · 5 km deep · 18 km away
  10. 1.93 km E of Saint Helena, California · 17770 days ago · 11 km deep · 48 km away
  11. 2.95 km ENE of Willits, California · 17770 days ago · 0 km deep · 80 km away
  12. 1.97 km SW of Calistoga, California · 17768 days ago · 5 km deep · 36 km away
  13. 1.56 km WSW of Cobb, California · 17768 days ago · 0 km deep · 2 km away
  14. 3.017 km NE of Lucerne, California · 17768 days ago · 6 km deep · 45 km away
  15. 1.96 km W of Cobb, California · 17767 days ago · 4 km deep · 2 km away
  16. 3.15 km ESE of Willits, California · 17766 days ago · 2 km deep · 77 km away
  17. 2.08 km S of Calistoga, California · 17766 days ago · 7 km deep · 40 km away
  18. 1.86 km W of Cobb, California · 17764 days ago · 0 km deep · 3 km away
  19. 2.29 km NNW of Redwood Valley, California · 17763 days ago · 7 km deep · 70 km away
  20. 2.31 km W of Angwin, California · 17762 days ago · 8 km deep · 40 km away
  21. 2.89 km NNE of Brooktrails, California · 17762 days ago · 4 km deep · 89 km away
  22. 2.418 km NE of Upper Lake, California · 17762 days ago · 3 km deep · 54 km away
  23. 1.84 km WSW of Cobb, California · 17761 days ago · 1 km deep · 4 km away
  24. 2.27 km NNE of Hopland, California · 17761 days ago · 1 km deep · 33 km away
  25. 2.27 km NE of Hopland, California · 17761 days ago · 2 km deep · 32 km away
  26. 1.67 km W of Cobb, California · 17760 days ago · 0 km deep · 1 km away
  27. 2.74 km ESE of Willits, California · 17759 days ago · 2 km deep · 77 km away
  28. 2.54 km ESE of Willits, California · 17759 days ago · 2 km deep · 77 km away
  29. 2.012 km ESE of Hidden Valley Lake, California · 17756 days ago · 3 km deep · 34 km away
  30. 1.66 km WSW of Cobb, California · 17755 days ago · 4 km deep · 2 km away
  31. 2.08 km ESE of Talmage, California · 17755 days ago · 8 km deep · 39 km away
  32. 2.37 km NNE of Nice, California · 17754 days ago · 7 km deep · 42 km away
  33. 2.46 km W of Cobb, California · 17754 days ago · 2 km deep · 2 km away
  34. 2.16 km W of Cobb, California · 17754 days ago · -1 km deep · 2 km away
  35. 2.56 km W of Cobb, California · 17753 days ago · 3 km deep · 2 km away
  36. 2.85 km ESE of Santa Rosa, California · 17752 days ago · 9 km deep · 46 km away
  37. 2.55 km ESE of Santa Rosa, California · 17752 days ago · 9 km deep · 46 km away
  38. 2.09 km ESE of Black Point-Green Point, California · 17751 days ago · 11 km deep · 88 km away
  39. 1.66 km W of Cobb, California · 17750 days ago · 1 km deep · 2 km away
  40. 1.811 km NE of Healdsburg, California · 17749 days ago · 4 km deep · 16 km away
  41. 1.610 km ESE of Hidden Valley Lake, California · 17749 days ago · 4 km deep · 32 km away
  42. 1.77 km W of Cobb, California · 17748 days ago · 3 km deep · 1 km away
  43. 1.76 km W of Cobb, California · 17747 days ago · -1 km deep · 3 km away
  44. 2.319 km SW of Stonyford, California · 17745 days ago · 9 km deep · 51 km away
  45. 2.48 km NNE of Hopland, California · 17744 days ago · 3 km deep · 35 km away
  46. 1.88 km S of Calistoga, California · 17743 days ago · 6 km deep · 40 km away
  47. 2.416 km NE of Nice, California · 17742 days ago · 7 km deep · 47 km away
  48. 2.46 km ESE of Willits, California · 17741 days ago · 6 km deep · 76 km away
  49. 2.111 km NE of Healdsburg, California · 17741 days ago · 5 km deep · 16 km away
  50. 1.610 km NE of Healdsburg, California · 17739 days ago · 4 km deep · 16 km away
  51. 2.411 km NNW of Potter Valley, California · 17739 days ago · 1 km deep · 73 km away
  52. 1.820 km WSW of Stonyford, CA · 17739 days ago · -1 km deep · 58 km away
  53. 1.83 km S of Clear Lake Riviera, California · 17738 days ago · 2 km deep · 15 km away
  54. 1.6Northern California · 17738 days ago · 3 km deep · 1 km away
  55. 1.66 km W of Cobb, California · 17738 days ago · 3 km deep · 2 km away
  56. 2.13 km SW of Calpella, California · 17738 days ago · 11 km deep · 57 km away
  57. 2.03 km SW of Calpella, California · 17738 days ago · 8 km deep · 58 km away
  58. 2.19 km NNW of Redwood Valley, California · 17737 days ago · 5 km deep · 70 km away
  59. 1.87 km W of Cobb, California · 17733 days ago · 0 km deep · 0 km away
  60. 1.66 km SSE of Boonville, California · 17733 days ago · 6 km deep · 47 km away

The first 60 of 74.

Before

  1. 2.16 km W of Cobb, California · 17779 days ago · 1 km deep · 2 km away
  2. 1.99 km E of Hidden Valley Lake, California · 17779 days ago · 8 km deep · 32 km away
  3. 2.06 km W of Cobb, California · 17780 days ago · 3 km deep · 1 km away
  4. 3.34 km WNW of Ukiah, California · 17780 days ago · 11 km deep · 54 km away
  5. 3.44 km NW of Ukiah, California · 17782 days ago · 7 km deep · 55 km away
  6. 2.23 km WNW of Ukiah, California · 17782 days ago · 9 km deep · 54 km away
  7. 2.54 km WNW of Ukiah, California · 17782 days ago · 10 km deep · 54 km away
  8. 1.66 km WSW of Cobb, California · 17783 days ago · -1 km deep · 2 km away
  9. 3.16 km WSW of Cobb, California · 17783 days ago · 0 km deep · 1 km away
  10. 1.97 km WSW of Cobb, California · 17783 days ago · 0 km deep · 2 km away
  11. 2.47 km W of Cobb, California · 17783 days ago · 3 km deep · 0 km away
  12. 1.58 km W of Cobb, California · 17784 days ago · 1 km deep · 1 km away
  13. 3.08 km WSW of Cobb, California · 17784 days ago · 0 km deep · 1 km away
  14. 2.36 km W of Cobb, California · 17784 days ago · 3 km deep · 1 km away
  15. 2.28 km W of Cobb, California · 17784 days ago · 0 km deep · 1 km away
  16. 2.78 km W of Cobb, California · 17784 days ago · 0 km deep · 1 km away
  17. 1.76 km WSW of Cobb, California · 17784 days ago · 1 km deep · 2 km away
  18. 1.96 km S of Clear Lake Riviera, California · 17784 days ago · 1 km deep · 13 km away
  19. 1.66 km NNW of Cobb, California · 17785 days ago · 3 km deep · 9 km away
  20. 1.93 km NE of Santa Rosa, California · 17785 days ago · 8 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038645. Read Tue, Sep 22, 2026, 9:34 PM UTC.