California earthquakes

M1.8 earthquake 4 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 4 km WSW of Cobb, California on Sun, Feb 5, 1978, 7:39 PM PST (03:39 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M4.5 4 km SE of Calpella, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1978-02-06 03:39:47 UTC
Depth
1.2 km (0.8 mi), shallow
Epicenter
38.806° N, 122.770° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
91°
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 53 in the 30 days before it.

After

  1. 2.27 km NNE of Hopland, California · 17770 days ago · 1 km deep · 37 km away
  2. 2.27 km NE of Hopland, California · 17770 days ago · 2 km deep · 36 km away
  3. 1.67 km W of Cobb, California · 17769 days ago · 0 km deep · 3 km away
  4. 2.74 km ESE of Willits, California · 17768 days ago · 2 km deep · 80 km away
  5. 2.54 km ESE of Willits, California · 17768 days ago · 2 km deep · 80 km away
  6. 2.012 km ESE of Hidden Valley Lake, California · 17765 days ago · 3 km deep · 30 km away
  7. 1.66 km WSW of Cobb, California · 17764 days ago · 4 km deep · 2 km away
  8. 2.08 km ESE of Talmage, California · 17764 days ago · 8 km deep · 42 km away
  9. 2.37 km NNE of Nice, California · 17764 days ago · 7 km deep · 43 km away
  10. 2.46 km W of Cobb, California · 17763 days ago · 2 km deep · 2 km away
  11. 2.16 km W of Cobb, California · 17763 days ago · -1 km deep · 2 km away
  12. 2.56 km W of Cobb, California · 17762 days ago · 3 km deep · 3 km away
  13. 2.85 km ESE of Santa Rosa, California · 17761 days ago · 9 km deep · 44 km away
  14. 2.55 km ESE of Santa Rosa, California · 17761 days ago · 9 km deep · 44 km away
  15. 2.09 km ESE of Black Point-Green Point, California · 17760 days ago · 11 km deep · 85 km away
  16. 1.66 km W of Cobb, California · 17759 days ago · 1 km deep · 2 km away
  17. 1.811 km NE of Healdsburg, California · 17758 days ago · 4 km deep · 15 km away
  18. 1.610 km ESE of Hidden Valley Lake, California · 17758 days ago · 4 km deep · 28 km away
  19. 1.77 km W of Cobb, California · 17757 days ago · 3 km deep · 3 km away
  20. 1.76 km W of Cobb, California · 17756 days ago · -1 km deep · 4 km away
  21. 2.319 km SW of Stonyford, California · 17754 days ago · 9 km deep · 52 km away
  22. 2.48 km NNE of Hopland, California · 17753 days ago · 3 km deep · 38 km away
  23. 1.88 km S of Calistoga, California · 17752 days ago · 6 km deep · 37 km away
  24. 2.416 km NE of Nice, California · 17751 days ago · 7 km deep · 47 km away
  25. 2.46 km ESE of Willits, California · 17750 days ago · 6 km deep · 79 km away
  26. 2.111 km NE of Healdsburg, California · 17750 days ago · 5 km deep · 15 km away
  27. 1.610 km NE of Healdsburg, California · 17748 days ago · 4 km deep · 15 km away
  28. 2.411 km NNW of Potter Valley, California · 17748 days ago · 1 km deep · 76 km away
  29. 1.820 km WSW of Stonyford, CA · 17748 days ago · -1 km deep · 59 km away
  30. 1.83 km S of Clear Lake Riviera, California · 17748 days ago · 2 km deep · 14 km away
  31. 1.6Northern California · 17747 days ago · 3 km deep · 4 km away
  32. 1.66 km W of Cobb, California · 17747 days ago · 3 km deep · 4 km away
  33. 2.13 km SW of Calpella, California · 17747 days ago · 11 km deep · 60 km away
  34. 2.03 km SW of Calpella, California · 17747 days ago · 8 km deep · 61 km away
  35. 2.19 km NNW of Redwood Valley, California · 17746 days ago · 5 km deep · 73 km away
  36. 1.87 km W of Cobb, California · 17742 days ago · 0 km deep · 4 km away
  37. 1.66 km SSE of Boonville, California · 17742 days ago · 6 km deep · 51 km away
  38. 1.96 km W of Cobb, California · 17742 days ago · 3 km deep · 3 km away
  39. 2.53 km ENE of Willits, California · 17740 days ago · 3 km deep · 83 km away
  40. 1.82 km E of Forestville, California · 17740 days ago · 2 km deep · 38 km away
  41. 1.87 km N of Princeton, California · 17739 days ago · 18 km deep · 99 km away
  42. 2.26 km W of Cobb, California · 17738 days ago · 3 km deep · 3 km away
  43. 2.49 km N of Cloverdale, California · 17737 days ago · 5 km deep · 22 km away
  44. 1.77 km W of Cobb, California · 17737 days ago · 1 km deep · 4 km away
  45. 1.77 km WSW of Cobb, California · 17737 days ago · 2 km deep · 3 km away
  46. 2.07 km WSW of Cobb, California · 17735 days ago · -1 km deep · 3 km away
  47. 2.57 km W of Cobb, California · 17734 days ago · 3 km deep · 3 km away
  48. 1.64 km WSW of Cobb, California · 17733 days ago · -1 km deep · 0 km away
  49. 1.719 km NE of Sea Ranch, California · 17732 days ago · 1 km deep · 44 km away
  50. 2.03 km W of Glen Ellen, California · 17732 days ago · 9 km deep · 53 km away
  51. 1.716 km N of Cazadero, California · 17731 days ago · 0 km deep · 33 km away
  52. 1.67 km W of Cobb, California · 17728 days ago · 3 km deep · 4 km away
  53. 1.75 km N of Healdsburg, California · 17726 days ago · 5 km deep · 19 km away
  54. 1.77 km WSW of Middletown, California · 17723 days ago · 2 km deep · 10 km away
  55. 2.47 km WSW of Middletown, California · 17723 days ago · 2 km deep · 10 km away
  56. 2.44 km NNE of Talmage, California · 17722 days ago · 8 km deep · 52 km away
  57. 4.54 km SE of Calpella, California · 17722 days ago · 12 km deep · 56 km away
  58. 2.55 km SSE of Calpella, California · 17722 days ago · 1 km deep · 56 km away
  59. 1.83 km SE of Calpella, California · 17722 days ago · 12 km deep · 57 km away
  60. 1.95 km NNE of Brooktrails, California · 17722 days ago · 1 km deep · 92 km away

The first 60 of at least 199.

Before

  1. 2.418 km NE of Upper Lake, California · 17771 days ago · 3 km deep · 55 km away
  2. 2.89 km NNE of Brooktrails, California · 17771 days ago · 4 km deep · 92 km away
  3. 2.31 km W of Angwin, California · 17771 days ago · 8 km deep · 37 km away
  4. 2.29 km NNW of Redwood Valley, California · 17772 days ago · 7 km deep · 73 km away
  5. 1.86 km W of Cobb, California · 17773 days ago · 0 km deep · 3 km away
  6. 2.08 km S of Calistoga, California · 17775 days ago · 7 km deep · 38 km away
  7. 3.15 km ESE of Willits, California · 17775 days ago · 2 km deep · 80 km away
  8. 1.96 km W of Cobb, California · 17776 days ago · 4 km deep · 4 km away
  9. 3.017 km NE of Lucerne, California · 17777 days ago · 6 km deep · 45 km away
  10. 1.56 km WSW of Cobb, California · 17777 days ago · 0 km deep · 2 km away
  11. 1.97 km SW of Calistoga, California · 17777 days ago · 5 km deep · 33 km away
  12. 2.95 km ENE of Willits, California · 17779 days ago · 0 km deep · 83 km away
  13. 1.93 km E of Saint Helena, California · 17780 days ago · 11 km deep · 44 km away
  14. 1.611 km ENE of Healdsburg, California · 17781 days ago · 5 km deep · 16 km away
  15. 2.07 km W of Cobb, California · 17781 days ago · 0 km deep · 4 km away
  16. 1.68 km W of Cobb, California · 17781 days ago · 0 km deep · 4 km away
  17. 1.511 km WNW of Cobb, California · 17781 days ago · 15 km deep · 9 km away
  18. 2.46 km ESE of Willits, California · 17782 days ago · -1 km deep · 79 km away
  19. 1.68 km WSW of Cobb, California · 17784 days ago · 1 km deep · 4 km away
  20. 1.65 km W of Cobb, California · 17786 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038853. Read Fri, Oct 2, 2026, 3:30 AM UTC.