California earthquakes

M1.6 earthquake 4 km SW of Cobb, California

A magnitude 1.6 earthquake struck 4 km SW of Cobb, California on Mon, Apr 15, 1991, 3:16 AM PDT (10:16 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.3 23 km NE of Potter 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1991-04-15 10:16:23 UTC
Depth
0.4 km (0.2 mi), shallow
Epicenter
38.792° N, 122.751° 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
±0.11
Depth from
From location
Station coverage gap
63°
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: 152 in the 60 days after this one and 84 in the 30 days before it.

After

  1. 1.99 km W of Cobb, California · 12956 days ago · 1 km deep · 8 km away
  2. 1.75 km W of Cobb, California · 12955 days ago · 0 km deep · 4 km away
  3. 2.82 km ENE of Manchester, California · 12955 days ago · 0 km deep · 81 km away
  4. 2.82 km WNW of Manchester, California · 12955 days ago · -1 km deep · 86 km away
  5. 1.75 km SSW of Cobb, California · 12954 days ago · 2 km deep · 2 km away
  6. 1.68 km W of Cobb, California · 12954 days ago · 1 km deep · 7 km away
  7. 1.65 km W of Cobb, California · 12954 days ago · 0 km deep · 4 km away
  8. 1.65 km W of Cobb, California · 12953 days ago · 1 km deep · 5 km away
  9. 1.924 km NE of Potter Valley, California · 12953 days ago · 10 km deep · 80 km away
  10. 1.57 km W of Cobb, California · 12953 days ago · 3 km deep · 6 km away
  11. 1.75 km WSW of Cobb, California · 12952 days ago · 3 km deep · 3 km away
  12. 1.85 km S of Hopland, California · 12952 days ago · 4 km deep · 35 km away
  13. 2.124 km NE of Potter Valley, California · 12951 days ago · 9 km deep · 80 km away
  14. 2.524 km NE of Potter Valley, California · 12951 days ago · 9 km deep · 80 km away
  15. 2.98 km W of Cobb, California · 12951 days ago · 1 km deep · 7 km away
  16. 1.58 km W of Cobb, California · 12951 days ago · 0 km deep · 7 km away
  17. 1.66 km WSW of Cobb, California · 12951 days ago · 2 km deep · 3 km away
  18. 1.813 km SSW of Willits, California · 12951 days ago · 1 km deep · 80 km away
  19. 1.84 km W of Cobb, California · 12949 days ago · 2 km deep · 4 km away
  20. 3.25 km WSW of Cobb, California · 12949 days ago · 2 km deep · 3 km away
  21. 2.11 km W of Green Valley, California · 12949 days ago · 6 km deep · 78 km away
  22. 1.90 km N of Hopland, California · 12948 days ago · -1 km deep · 38 km away
  23. 1.621 km NE of Potter Valley, California · 12948 days ago · 10 km deep · 76 km away
  24. 1.57 km W of Cobb, California · 12947 days ago · 3 km deep · 6 km away
  25. 2.27 km WSW of Cobb, California · 12947 days ago · 1 km deep · 5 km away
  26. 1.610 km SE of Willits, California · 12945 days ago · 7 km deep · 76 km away
  27. 1.94 km W of Cobb, California · 12945 days ago · -1 km deep · 4 km away
  28. 1.67 km WSW of Cobb, California · 12944 days ago · 0 km deep · 5 km away
  29. 1.98 km N of Geyserville, California · 12944 days ago · 4 km deep · 14 km away
  30. 2.05 km WSW of Cobb, California · 12943 days ago · 3 km deep · 3 km away
  31. 1.611 km SE of Hopland, California · 12943 days ago · -1 km deep · 26 km away
  32. 1.73 km NNW of Larkfield-Wikiup, California · 12942 days ago · 0 km deep · 28 km away
  33. 1.73 km W of Green Valley, California · 12941 days ago · 4 km deep · 77 km away
  34. 1.94 km WSW of Cobb, California · 12941 days ago · 0 km deep · 3 km away
  35. 1.64 km SSE of Lakeport, California · 12940 days ago · 1 km deep · 27 km away
  36. 1.85 km W of Cobb, California · 12940 days ago · 0 km deep · 4 km away
  37. 1.94 km SSE of Lakeport, California · 12940 days ago · 4 km deep · 27 km away
  38. 1.84 km S of Cobb, California · 12940 days ago · 2 km deep · 3 km away
  39. 2.515 km NE of Angwin, California · 12939 days ago · 3 km deep · 38 km away
  40. 1.54 km NE of Talmage, California · 12939 days ago · 8 km deep · 52 km away
  41. 1.65 km SW of Cobb, California · 12938 days ago · 1 km deep · 1 km away
  42. 1.96 km W of Cobb, California · 12938 days ago · 2 km deep · 5 km away
  43. 1.67 km ESE of Talmage, California · 12937 days ago · 8 km deep · 45 km away
  44. 1.74 km WSW of Cobb, California · 12937 days ago · 1 km deep · 3 km away
  45. 1.612 km ESE of Hidden Valley Lake, California · 12937 days ago · 6 km deep · 28 km away
  46. 1.68 km ENE of Brooktrails, California · 12936 days ago · 8 km deep · 90 km away
  47. 2.011 km ESE of Hidden Valley Lake, California · 12936 days ago · 4 km deep · 27 km away
  48. 1.83 km E of Upper Lake, California · 12936 days ago · 7 km deep · 43 km away
  49. 1.58 km W of Cobb, California · 12935 days ago · -1 km deep · 7 km away
  50. 2.38 km W of Cobb, California · 12935 days ago · 0 km deep · 7 km away
  51. 2.25 km WSW of Cobb, California · 12935 days ago · 3 km deep · 3 km away
  52. 1.57 km W of Middletown, California · 12934 days ago · 2 km deep · 7 km away
  53. 1.98 km WSW of Cobb, California · 12934 days ago · 3 km deep · 5 km away
  54. 2.16 km SW of Boonville, California · 12934 days ago · 4 km deep · 60 km away
  55. 2.75 km WSW of Cobb, California · 12933 days ago · 2 km deep · 3 km away
  56. 1.95 km WNW of Cobb, California · 12933 days ago · 1 km deep · 6 km away
  57. 2.34 km WSW of Cobb, California · 12933 days ago · 1 km deep · 3 km away
  58. 2.02 km SSW of Cobb, California · 12932 days ago · 2 km deep · 1 km away
  59. 2.16 km WNW of Cobb, California · 12932 days ago · 1 km deep · 6 km away
  60. 1.84 km W of Cobb, California · 12931 days ago · 1 km deep · 4 km away

The first 60 of 152.

Before

  1. 1.727 km N of Potter Valley, California · 12957 days ago · 1 km deep · 91 km away
  2. 1.95 km SW of Cobb, California · 12957 days ago · 2 km deep · 2 km away
  3. 1.65 km SSW of Cobb, California · 12958 days ago · -1 km deep · 2 km away
  4. 2.55 km SW of Cobb, California · 12958 days ago · 2 km deep · 2 km away
  5. 2.05 km SW of Cobb, California · 12958 days ago · 2 km deep · 2 km away
  6. 1.87 km W of Cobb, California · 12958 days ago · -1 km deep · 7 km away
  7. 1.55 km WSW of Cobb, California · 12958 days ago · 1 km deep · 2 km away
  8. 1.67 km W of Cobb, California · 12958 days ago · 1 km deep · 7 km away
  9. 1.63 km NNW of Cobb, California · 12959 days ago · -1 km deep · 7 km away
  10. 2.07 km W of Cobb, California · 12959 days ago · 2 km deep · 5 km away
  11. 2.44 km W of Cobb, California · 12960 days ago · 0 km deep · 3 km away
  12. 2.36 km WNW of Cobb, California · 12960 days ago · 1 km deep · 7 km away
  13. 1.63 km SSW of Cobb, California · 12960 days ago · 2 km deep · 0 km away
  14. 2.74 km WSW of Cobb, California · 12961 days ago · 0 km deep · 2 km away
  15. 1.88 km W of Cobb, California · 12962 days ago · 0 km deep · 7 km away
  16. 1.77 km N of Geyserville, California · 12962 days ago · 4 km deep · 14 km away
  17. 2.110 km WNW of Cobb, California · 12962 days ago · 1 km deep · 10 km away
  18. 1.6Northern California · 12963 days ago · 9 km deep · 95 km away
  19. 2.14 km SW of Cobb, California · 12963 days ago · 0 km deep · 1 km away
  20. 1.75 km WSW of Cobb, California · 12964 days ago · 2 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc210705. Read Mon, Oct 5, 2026, 3:44 AM UTC.