California earthquakes

M2.7 earthquake 4 km N of Brooktrails, California

A magnitude 2.7 earthquake struck 4 km N of Brooktrails, California on Fri, Jul 1, 1977, 12:56 AM PDT (07:56 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M4.3 12 km NE of Miranda, 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
2.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-07-01 07:56:40 UTC
Depth
10.5 km (6.5 mi), shallow
Epicenter
39.482° N, 123.385° 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 5.8 km horizontally, 2.1 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
294°, poorly surrounded by stations
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 59 in the 60 days after this one and 20 in the 30 days before it.

After

  1. 2.28 km W of Cobb, California · 17992 days ago · 0 km deep · 89 km away
  2. 2.515 km NE of Phillipsville, California · 17992 days ago · 17 km deep · 97 km away
  3. 1.66 km W of Cobb, California · 17992 days ago · 3 km deep · 90 km away
  4. 2.510 km W of Cobb, California · 17990 days ago · 0 km deep · 86 km away
  5. 1.710 km W of Cobb, California · 17990 days ago · 1 km deep · 86 km away
  6. 1.66 km WSW of Cobb, California · 17985 days ago · 3 km deep · 90 km away
  7. 2.86 km WSW of Cobb, California · 17984 days ago · 4 km deep · 90 km away
  8. 4.312 km NE of Miranda, California · 17982 days ago · 29 km deep · 98 km away
  9. 2.011 km NE of Phillipsville, California · 17982 days ago · 31 km deep · 93 km away
  10. 2.02 km WSW of Myers Flat, California · 17982 days ago · 33 km deep · 97 km away
  11. 1.51 km E of Myers Flat, California · 17982 days ago · 29 km deep · 96 km away
  12. 3.711 km NE of Phillipsville, California · 17982 days ago · 32 km deep · 93 km away
  13. 2.07 km WSW of Cobb, California · 17982 days ago · 0 km deep · 90 km away
  14. 3.512 km NNE of Phillipsville, California · 17981 days ago · 34 km deep · 95 km away
  15. 2.09 km NW of Alderpoint, California · 17981 days ago · 27 km deep · 88 km away
  16. 1.62 km WSW of Miranda, California · 17981 days ago · 31 km deep · 92 km away
  17. 2.17 km W of Cobb, California · 17981 days ago · 3 km deep · 89 km away
  18. 1.56 km SSW of Alderpoint, California · 17981 days ago · 17 km deep · 75 km away
  19. 1.97 km WSW of Cobb, California · 17979 days ago · 0 km deep · 90 km away
  20. 3.014 km NE of Phillipsville, California · 17979 days ago · 32 km deep · 95 km away
  21. 1.57 km W of Cobb, California · 17975 days ago · 0 km deep · 89 km away
  22. 2.07 km WSW of Cobb, California · 17972 days ago · 3 km deep · 92 km away
  23. 1.66 km ESE of Lucerne, California · 17971 days ago · 3 km deep · 72 km away
  24. 2.17 km WSW of Cobb, California · 17971 days ago · 0 km deep · 90 km away
  25. 2.57 km W of Cobb, California · 17971 days ago · 0 km deep · 90 km away
  26. 2.96 km WSW of Cobb, California · 17969 days ago · 0 km deep · 90 km away
  27. 1.75 km E of Hopland, California · 17967 days ago · 2 km deep · 64 km away
  28. 2.16 km W of Cobb, California · 17966 days ago · 1 km deep · 90 km away
  29. 2.26 km WSW of Cobb, California · 17966 days ago · 1 km deep · 90 km away
  30. 2.27 km W of Cobb, California · 17961 days ago · 1 km deep · 89 km away
  31. 1.64 km WSW of Cobb, California · 17960 days ago · 2 km deep · 92 km away
  32. 1.68 km WSW of Cobb, California · 17960 days ago · 0 km deep · 90 km away
  33. 1.58 km WSW of Cobb, California · 17960 days ago · 0 km deep · 90 km away
  34. 2.08 km W of Cobb, California · 17957 days ago · -1 km deep · 88 km away
  35. 1.58 km W of Cobb, California · 17957 days ago · 0 km deep · 88 km away
  36. 1.76 km W of Cobb, California · 17956 days ago · 3 km deep · 89 km away
  37. 2.219 km NE of Upper Lake, California · 17956 days ago · 3 km deep · 59 km away
  38. 1.57 km W of Cobb, California · 17954 days ago · 3 km deep · 89 km away
  39. 1.73 km NNE of Clearlake, California · 17954 days ago · 2 km deep · 87 km away
  40. 1.67 km W of Cobb, California · 17954 days ago · 4 km deep · 89 km away
  41. 2.512 km NE of Miranda, California · 17953 days ago · 30 km deep · 96 km away
  42. 1.62 km ENE of Clear Lake Riviera, California · 17952 days ago · 1 km deep · 83 km away
  43. 2.214 km NE of Upper Lake, California · 17951 days ago · 10 km deep · 57 km away
  44. 1.78 km W of Cobb, California · 17945 days ago · 1 km deep · 90 km away
  45. 2.311 km NE of Phillipsville, California · 17944 days ago · 30 km deep · 92 km away
  46. 1.64 km WSW of Cobb, California · 17944 days ago · 3 km deep · 92 km away
  47. 1.57 km W of Cobb, California · 17943 days ago · 3 km deep · 89 km away
  48. 2.89 km WSW of Cobb, CA · 17941 days ago · 1 km deep · 90 km away
  49. 2.06 km WSW of Cobb, California · 17940 days ago · 1 km deep · 91 km away
  50. 2.16 km WSW of Cobb, California · 17940 days ago · 1 km deep · 91 km away
  51. 1.96 km WSW of Cobb, California · 17940 days ago · 0 km deep · 91 km away
  52. 1.96 km WSW of Cobb, California · 17940 days ago · -1 km deep · 91 km away
  53. 1.76 km W of Cobb, California · 17940 days ago · 3 km deep · 89 km away
  54. 1.78 km W of Cobb, California · 17938 days ago · 0 km deep · 89 km away
  55. 1.9Northern California · 17938 days ago · 0 km deep · 89 km away
  56. 2.619 km NE of Nice, California · 17937 days ago · 10 km deep · 62 km away
  57. 1.56 km ESE of Hopland, California · 17936 days ago · 6 km deep · 67 km away
  58. 1.68 km WSW of Cobb, California · 17935 days ago · 3 km deep · 90 km away
  59. 2.87 km NNW of Redwood Valley, California · 17934 days ago · 11 km deep · 22 km away

Before

  1. 2.06 km W of Cobb, California · 17993 days ago · 1 km deep · 90 km away
  2. 1.68 km W of Cobb, California · 17993 days ago · 3 km deep · 88 km away
  3. 2.58 km W of Cobb, California · 17994 days ago · 0 km deep · 89 km away
  4. 2.03 km WSW of Calpella, California · 17994 days ago · 10 km deep · 31 km away
  5. 1.68 km SW of Hopland, California · 17997 days ago · 2 km deep · 65 km away
  6. 1.78 km W of Cobb, California · 17999 days ago · 2 km deep · 89 km away
  7. 1.64 km NE of Hopland, California · 18003 days ago · 4 km deep · 59 km away
  8. 2.36 km W of Cobb, California · 18004 days ago · -1 km deep · 90 km away
  9. 1.77 km W of Cobb, California · 18007 days ago · 3 km deep · 89 km away
  10. 1.85 km WSW of Cobb, California · 18010 days ago · 1 km deep · 93 km away
  11. 2.16 km W of Cobb, California · 18014 days ago · 1 km deep · 89 km away
  12. 1.95 km WSW of Cobb, California · 18014 days ago · 1 km deep · 91 km away
  13. 2.57 km W of Cobb, California · 18015 days ago · 3 km deep · 89 km away
  14. 1.87 km W of Cobb, California · 18015 days ago · 3 km deep · 89 km away
  15. 1.616 km W of Cloverdale, California · 18018 days ago · 3 km deep · 76 km away
  16. 2.40 km SSE of Redway, California · 18018 days ago · 18 km deep · 79 km away
  17. 1.67 km WSW of Cobb, California · 18020 days ago · 3 km deep · 90 km away
  18. 2.18 km WSW of Cobb, California · 18020 days ago · 0 km deep · 90 km away
  19. 1.86 km W of Cobb, California · 18020 days ago · 0 km deep · 90 km away
  20. 1.87 km WSW of Cobb, California · 18021 days ago · 4 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1035644. Read Mon, Oct 5, 2026, 12:02 AM UTC.