California earthquakes

M1.6 earthquake 5 km WSW of Cobb, California

A magnitude 1.6 earthquake struck 5 km WSW of Cobb, California on Thu, Mar 28, 1991, 3:18 PM PST (23:18 UTC), 1 km (1 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
1991-03-28 23:18:19 UTC
Depth
1.2 km (0.8 mi), shallow
Epicenter
38.793° N, 122.780° 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, 0.5 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
74°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 151 in the 60 days after this one and 91 in the 30 days before it.

After

  1. 1.64 km WSW of Cobb, California · 12974 days ago · 2 km deep · 1 km away
  2. 2.25 km W of Cobb, California · 12974 days ago · -1 km deep · 4 km away
  3. 2.35 km W of Cobb, California · 12974 days ago · 1 km deep · 2 km away
  4. 1.722 km SSE of Covelo, California · 12974 days ago · 3 km deep · 96 km away
  5. 1.96 km SSW of Calistoga, California · 12973 days ago · 3 km deep · 33 km away
  6. 1.77 km SSE of Cobb, California · 12973 days ago · 1 km deep · 8 km away
  7. 1.510 km W of Cobb, California · 12973 days ago · 2 km deep · 7 km away
  8. 1.87 km S of Cobb, California · 12972 days ago · 2 km deep · 6 km away
  9. 2.0Northern California · 12972 days ago · 1 km deep · 1 km away
  10. 1.95 km WSW of Cobb, California · 12972 days ago · 0 km deep · 0 km away
  11. 1.83 km SW of Cobb, California · 12972 days ago · 0 km deep · 2 km away
  12. 1.53 km SSW of Cobb, California · 12970 days ago · 2 km deep · 3 km away
  13. 1.64 km WNW of Cobb, California · 12970 days ago · 2 km deep · 5 km away
  14. 1.97 km WSW of Cobb, California · 12970 days ago · 1 km deep · 2 km away
  15. 1.94 km W of Cobb, California · 12970 days ago · 1 km deep · 3 km away
  16. 2.18 km S of Cobb, California · 12969 days ago · 2 km deep · 7 km away
  17. 2.96 km WSW of Cobb, California · 12968 days ago · 0 km deep · 1 km away
  18. 2.47 km W of Cobb, California · 12966 days ago · 0 km deep · 5 km away
  19. 1.84 km W of Cobb, California · 12966 days ago · 1 km deep · 3 km away
  20. 1.87 km WNW of Cobb, California · 12966 days ago · 1 km deep · 5 km away
  21. 1.66 km E of Santa Rosa, California · 12965 days ago · 6 km deep · 41 km away
  22. 1.66 km SW of Cobb, California · 12965 days ago · -1 km deep · 1 km away
  23. 1.55 km WSW of Cobb, California · 12965 days ago · 0 km deep · 0 km away
  24. 1.85 km WSW of Cobb, California · 12965 days ago · 0 km deep · 1 km away
  25. 1.618 km E of Potter Valley, California · 12965 days ago · 1 km deep · 63 km away
  26. 1.67 km WSW of Cobb, California · 12964 days ago · -1 km deep · 2 km away
  27. 2.16 km WSW of Cobb, California · 12963 days ago · 1 km deep · 2 km away
  28. 1.75 km WSW of Cobb, California · 12963 days ago · 2 km deep · 0 km away
  29. 2.14 km SW of Cobb, California · 12963 days ago · 0 km deep · 2 km away
  30. 1.6Northern California · 12963 days ago · 9 km deep · 96 km away
  31. 2.110 km WNW of Cobb, California · 12962 days ago · 1 km deep · 8 km away
  32. 1.77 km N of Geyserville, California · 12962 days ago · 4 km deep · 12 km away
  33. 1.88 km W of Cobb, California · 12962 days ago · 0 km deep · 4 km away
  34. 2.74 km WSW of Cobb, California · 12961 days ago · 0 km deep · 2 km away
  35. 1.63 km SSW of Cobb, California · 12960 days ago · 2 km deep · 3 km away
  36. 2.36 km WNW of Cobb, California · 12960 days ago · 1 km deep · 7 km away
  37. 2.44 km W of Cobb, California · 12960 days ago · 0 km deep · 3 km away
  38. 2.07 km W of Cobb, California · 12959 days ago · 2 km deep · 3 km away
  39. 1.63 km NNW of Cobb, California · 12959 days ago · -1 km deep · 8 km away
  40. 1.67 km W of Cobb, California · 12958 days ago · 1 km deep · 5 km away
  41. 1.55 km WSW of Cobb, California · 12958 days ago · 1 km deep · 0 km away
  42. 1.87 km W of Cobb, California · 12958 days ago · -1 km deep · 5 km away
  43. 2.05 km SW of Cobb, California · 12958 days ago · 2 km deep · 0 km away
  44. 2.55 km SW of Cobb, California · 12958 days ago · 2 km deep · 1 km away
  45. 1.65 km SSW of Cobb, California · 12958 days ago · -1 km deep · 3 km away
  46. 1.95 km SW of Cobb, California · 12957 days ago · 2 km deep · 0 km away
  47. 1.727 km N of Potter Valley, California · 12957 days ago · 1 km deep · 90 km away
  48. 1.64 km SW of Cobb, California · 12957 days ago · 0 km deep · 2 km away
  49. 1.99 km W of Cobb, California · 12956 days ago · 1 km deep · 6 km away
  50. 1.75 km W of Cobb, California · 12955 days ago · 0 km deep · 3 km away
  51. 2.82 km ENE of Manchester, California · 12954 days ago · 0 km deep · 79 km away
  52. 2.82 km WNW of Manchester, California · 12954 days ago · -1 km deep · 83 km away
  53. 1.75 km SSW of Cobb, California · 12954 days ago · 2 km deep · 4 km away
  54. 1.68 km W of Cobb, California · 12954 days ago · 1 km deep · 5 km away
  55. 1.65 km W of Cobb, California · 12954 days ago · 0 km deep · 2 km away
  56. 1.65 km W of Cobb, California · 12953 days ago · 1 km deep · 4 km away
  57. 1.924 km NE of Potter Valley, California · 12953 days ago · 10 km deep · 80 km away
  58. 1.57 km W of Cobb, California · 12952 days ago · 3 km deep · 4 km away
  59. 1.75 km WSW of Cobb, California · 12952 days ago · 3 km deep · 2 km away
  60. 1.85 km S of Hopland, California · 12952 days ago · 4 km deep · 33 km away

The first 60 of 151.

Before

  1. 2.13 km E of Talmage, California · 12974 days ago · 6 km deep · 48 km away
  2. 1.95 km SW of Cobb, California · 12975 days ago · 2 km deep · 1 km away
  3. 1.69 km W of Cobb, California · 12975 days ago · 1 km deep · 6 km away
  4. 1.79 km WNW of Cobb, California · 12976 days ago · 2 km deep · 6 km away
  5. 1.521 km ENE of Potter Valley, California · 12976 days ago · 6 km deep · 65 km away
  6. 1.59 km W of Cobb, California · 12976 days ago · 1 km deep · 6 km away
  7. 1.94 km W of Cobb, California · 12977 days ago · 0 km deep · 3 km away
  8. 2.03 km SW of Cobb, California · 12978 days ago · 1 km deep · 3 km away
  9. 2.26 km W of Cobb, California · 12979 days ago · 1 km deep · 3 km away
  10. 2.15 km SW of Cobb, California · 12979 days ago · 2 km deep · 0 km away
  11. 1.515 km ENE of Angwin, California · 12980 days ago · 4 km deep · 44 km away
  12. 2.113 km WSW of Hopland, California · 12980 days ago · 0 km deep · 43 km away
  13. 1.811 km N of Brooktrails, California · 12980 days ago · 10 km deep · 98 km away
  14. 1.66 km WNW of Cobb, California · 12980 days ago · 1 km deep · 7 km away
  15. 1.85 km SW of Cobb, California · 12980 days ago · 0 km deep · 1 km away
  16. 1.59 km W of Redwood Valley, California · 12980 days ago · 1 km deep · 69 km away
  17. 2.16 km WSW of Cobb, California · 12982 days ago · 1 km deep · 0 km away
  18. 2.38 km WNW of Cobb, California · 12983 days ago · 2 km deep · 6 km away
  19. 1.617 km NE of Clearlake, California · 12984 days ago · 14 km deep · 40 km away
  20. 1.66 km SW of Cobb, California · 12984 days ago · 1 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1185196. Read Sun, Oct 4, 2026, 10:34 PM UTC.