California earthquakes

M1.8 earthquake 11 km N of Brooktrails, California

A magnitude 1.8 earthquake struck 11 km N of Brooktrails, California on Fri, Mar 22, 1991, 8:49 PM PST (04:49 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.2 5 km WSW of Cobb, California. This one was a foreshock.

Brooktrails 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
1991-03-23 04:49:55 UTC
Depth
9.5 km (5.9 mi), shallow
Epicenter
39.545° N, 123.367° 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, 0.6 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
100°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 139 in the 60 days after this one and 89 in the 30 days before it.

After

  1. 2.113 km WSW of Hopland, California · 12980 days ago · 0 km deep · 71 km away
  2. 2.15 km SW of Cobb, California · 12979 days ago · 2 km deep · 98 km away
  3. 2.26 km W of Cobb, California · 12979 days ago · 1 km deep · 95 km away
  4. 2.03 km SW of Cobb, California · 12979 days ago · 1 km deep · 99 km away
  5. 1.92 km NE of Myers Flat, California · 12978 days ago · 26 km deep · 92 km away
  6. 1.94 km W of Cobb, California · 12977 days ago · 0 km deep · 96 km away
  7. 1.59 km W of Cobb, California · 12976 days ago · 1 km deep · 92 km away
  8. 1.521 km ENE of Potter Valley, California · 12976 days ago · 6 km deep · 47 km away
  9. 1.79 km WNW of Cobb, California · 12976 days ago · 2 km deep · 91 km away
  10. 1.69 km W of Cobb, California · 12976 days ago · 1 km deep · 92 km away
  11. 1.95 km SW of Cobb, California · 12975 days ago · 2 km deep · 99 km away
  12. 2.014 km N of Brooktrails, California · 12975 days ago · 7 km deep · 4 km away
  13. 2.13 km E of Talmage, California · 12974 days ago · 6 km deep · 50 km away
  14. 1.65 km WSW of Cobb, California · 12974 days ago · 1 km deep · 98 km away
  15. 1.64 km WSW of Cobb, California · 12974 days ago · 2 km deep · 97 km away
  16. 2.25 km W of Cobb, California · 12974 days ago · -1 km deep · 94 km away
  17. 2.35 km W of Cobb, California · 12974 days ago · 1 km deep · 96 km away
  18. 1.722 km SSE of Covelo, California · 12974 days ago · 3 km deep · 22 km away
  19. 1.510 km W of Cobb, California · 12973 days ago · 2 km deep · 92 km away
  20. 2.0Northern California · 12972 days ago · 1 km deep · 97 km away
  21. 1.95 km WSW of Cobb, California · 12972 days ago · 0 km deep · 98 km away
  22. 2.029 km W of Paskenta, California · 12972 days ago · -1 km deep · 54 km away
  23. 1.83 km SW of Cobb, California · 12972 days ago · 0 km deep · 99 km away
  24. 1.53 km SSW of Cobb, California · 12971 days ago · 2 km deep · 99 km away
  25. 1.64 km WNW of Cobb, California · 12970 days ago · 2 km deep · 94 km away
  26. 1.97 km WSW of Cobb, California · 12970 days ago · 1 km deep · 96 km away
  27. 1.94 km W of Cobb, California · 12970 days ago · 1 km deep · 95 km away
  28. 2.96 km WSW of Cobb, California · 12968 days ago · 0 km deep · 97 km away
  29. 2.47 km W of Cobb, California · 12966 days ago · 0 km deep · 92 km away
  30. 1.84 km W of Cobb, California · 12966 days ago · 1 km deep · 95 km away
  31. 1.87 km WNW of Cobb, California · 12966 days ago · 1 km deep · 92 km away
  32. 1.66 km SW of Cobb, California · 12965 days ago · -1 km deep · 98 km away
  33. 1.55 km WSW of Cobb, California · 12965 days ago · 0 km deep · 97 km away
  34. 1.85 km WSW of Cobb, California · 12965 days ago · 0 km deep · 97 km away
  35. 2.54 km SW of Artois, California · 12965 days ago · 20 km deep · 97 km away
  36. 1.618 km E of Potter Valley, California · 12965 days ago · 1 km deep · 45 km away
  37. 1.67 km WSW of Cobb, California · 12964 days ago · -1 km deep · 96 km away
  38. 2.16 km WSW of Cobb, California · 12964 days ago · 1 km deep · 96 km away
  39. 1.75 km WSW of Cobb, California · 12964 days ago · 2 km deep · 98 km away
  40. 2.14 km SW of Cobb, California · 12963 days ago · 0 km deep · 99 km away
  41. 2.110 km WNW of Cobb, California · 12962 days ago · 1 km deep · 90 km away
  42. 1.77 km N of Geyserville, California · 12962 days ago · 4 km deep · 94 km away
  43. 1.88 km W of Cobb, California · 12962 days ago · 0 km deep · 94 km away
  44. 2.74 km WSW of Cobb, California · 12961 days ago · 0 km deep · 97 km away
  45. 1.63 km SSW of Cobb, California · 12960 days ago · 2 km deep · 99 km away
  46. 2.36 km WNW of Cobb, California · 12960 days ago · 1 km deep · 92 km away
  47. 2.44 km W of Cobb, California · 12960 days ago · 0 km deep · 96 km away
  48. 2.07 km W of Cobb, California · 12959 days ago · 2 km deep · 95 km away
  49. 1.63 km NNW of Cobb, California · 12959 days ago · -1 km deep · 94 km away
  50. 1.67 km W of Cobb, California · 12958 days ago · 1 km deep · 93 km away
  51. 1.55 km WSW of Cobb, California · 12958 days ago · 1 km deep · 98 km away
  52. 1.87 km W of Cobb, California · 12958 days ago · -1 km deep · 93 km away
  53. 2.05 km SW of Cobb, California · 12958 days ago · 2 km deep · 98 km away
  54. 2.55 km SW of Cobb, California · 12958 days ago · 2 km deep · 99 km away
  55. 2.310 km SW of Mad River, California · 12958 days ago · 21 km deep · 94 km away
  56. 1.95 km SW of Cobb, California · 12957 days ago · 2 km deep · 98 km away
  57. 1.727 km N of Potter Valley, California · 12957 days ago · 1 km deep · 25 km away
  58. 2.216 km S of Hayfork, California · 12957 days ago · 31 km deep · 97 km away
  59. 1.64 km SW of Cobb, California · 12957 days ago · 0 km deep · 99 km away
  60. 1.99 km W of Cobb, California · 12956 days ago · 1 km deep · 93 km away

The first 60 of 139.

Before

  1. 1.66 km WNW of Cobb, California · 12980 days ago · 1 km deep · 91 km away
  2. 1.85 km SW of Cobb, California · 12980 days ago · 0 km deep · 98 km away
  3. 1.59 km W of Redwood Valley, California · 12980 days ago · 1 km deep · 32 km away
  4. 2.16 km WSW of Cobb, California · 12982 days ago · 1 km deep · 98 km away
  5. 2.38 km WNW of Cobb, California · 12984 days ago · 2 km deep · 91 km away
  6. 1.617 km NE of Clearlake, California · 12984 days ago · 14 km deep · 96 km away
  7. 2.011 km W of Rancho Tehama Reserve, California · 12984 days ago · 15 km deep · 90 km away
  8. 1.66 km SW of Cobb, California · 12984 days ago · 1 km deep · 99 km away
  9. 1.97 km W of Cobb, California · 12984 days ago · 3 km deep · 94 km away
  10. 1.83 km SSW of Cobb, California · 12984 days ago · 2 km deep · 100 km away
  11. 1.65 km W of Cobb, California · 12984 days ago · 2 km deep · 95 km away
  12. 1.514 km NE of Upper Lake, California · 12984 days ago · 1 km deep · 59 km away
  13. 1.920 km ENE of Potter Valley, California · 12984 days ago · 9 km deep · 44 km away
  14. 1.68 km W of Cobb, California · 12985 days ago · 2 km deep · 94 km away
  15. 1.64 km WSW of Cobb, California · 12985 days ago · 3 km deep · 98 km away
  16. 1.74 km WSW of Cobb, California · 12985 days ago · 1 km deep · 97 km away
  17. 1.97 km W of Cobb, California · 12985 days ago · 3 km deep · 94 km away
  18. 1.87 km W of Cobb, California · 12985 days ago · 3 km deep · 94 km away
  19. 3.37 km W of Cobb, California · 12985 days ago · 3 km deep · 94 km away
  20. 1.87 km WSW of Cobb, California · 12985 days ago · 1 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc208409. Read Mon, Oct 5, 2026, 3:24 AM UTC.