California earthquakes

M1.7 earthquake 12 km N of Brooktrails, California

A magnitude 1.7 earthquake struck 12 km N of Brooktrails, California on Wed, Apr 20, 1988, 9:43 PM PDT (04:43 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.5 6 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1988-04-21 04:43:55 UTC
Depth
6.4 km (4.0 mi), shallow
Epicenter
39.559° N, 123.368° 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, 0.8 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
86°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 154 in the 60 days after this one and 76 in the 30 days before it.

After

  1. 2.04 km W of Cobb, California · 14044 days ago · 2 km deep · 97 km away
  2. 1.55 km SW of Cobb, California · 14043 days ago · 4 km deep · 100 km away
  3. 2.09 km WSW of Cobb, California · 14043 days ago · 1 km deep · 97 km away
  4. 2.49 km WNW of Cobb, California · 14043 days ago · 0 km deep · 91 km away
  5. 2.49 km WNW of Cobb, California · 14043 days ago · 1 km deep · 92 km away
  6. 2.16 km WSW of Cobb, California · 14043 days ago · 3 km deep · 97 km away
  7. 1.58 km W of Cobb, California · 14042 days ago · 2 km deep · 93 km away
  8. 2.07 km W of Cobb, California · 14042 days ago · 3 km deep · 95 km away
  9. 2.48 km WSW of Hopland, California · 14042 days ago · 5 km deep · 69 km away
  10. 1.610 km N of Cloverdale, California · 14040 days ago · 3 km deep · 80 km away
  11. 2.16 km W of Cobb, California · 14039 days ago · 3 km deep · 96 km away
  12. 1.68 km W of Cobb, California · 14038 days ago · 1 km deep · 94 km away
  13. 1.65 km WNW of Cobb, California · 14038 days ago · 3 km deep · 95 km away
  14. 1.86 km WSW of Cobb, California · 14038 days ago · 3 km deep · 97 km away
  15. 1.66 km W of Cobb, California · 14038 days ago · -1 km deep · 95 km away
  16. 1.95 km W of Cobb, California · 14037 days ago · 0 km deep · 97 km away
  17. 3.05 km SW of Cobb, California · 14037 days ago · 2 km deep · 100 km away
  18. 1.66 km W of Cobb, California · 14035 days ago · 4 km deep · 97 km away
  19. 2.28 km WSW of Cobb, California · 14034 days ago · 3 km deep · 97 km away
  20. 1.65 km WSW of Cobb, California · 14034 days ago · 1 km deep · 99 km away
  21. 1.56 km W of Cobb, California · 14034 days ago · 4 km deep · 96 km away
  22. 1.68 km SE of Hopland, California · 14034 days ago · 1 km deep · 75 km away
  23. 1.95 km WSW of Cobb, California · 14034 days ago · 0 km deep · 99 km away
  24. 1.89 km WSW of Cobb, California · 14032 days ago · 2 km deep · 97 km away
  25. 1.59 km WSW of Cobb, California · 14032 days ago · 2 km deep · 97 km away
  26. 2.15 km WSW of Cobb, California · 14032 days ago · 3 km deep · 98 km away
  27. 1.54 km WSW of Cobb, California · 14031 days ago · 1 km deep · 98 km away
  28. 2.429 km SE of Covelo, California · 14030 days ago · 14 km deep · 32 km away
  29. 2.24 km N of Cobb, California · 14030 days ago · 2 km deep · 95 km away
  30. 2.68 km SE of Potter Valley, California · 14029 days ago · 4 km deep · 43 km away
  31. 1.85 km ESE of Potter Valley, California · 14029 days ago · 4 km deep · 39 km away
  32. 2.52 km WSW of Clearlake Oaks, California · 14028 days ago · 2 km deep · 84 km away
  33. 2.34 km WSW of Cobb, California · 14028 days ago · 1 km deep · 99 km away
  34. 2.19 km W of Cobb, California · 14028 days ago · -1 km deep · 95 km away
  35. 2.420 km W of Williams, California · 14027 days ago · 0 km deep · 98 km away
  36. 1.94 km WNW of Cobb, California · 14026 days ago · 3 km deep · 95 km away
  37. 2.65 km W of Cobb, California · 14025 days ago · 0 km deep · 97 km away
  38. 2.84 km W of Cobb, California · 14025 days ago · 0 km deep · 97 km away
  39. 1.64 km W of Cobb, California · 14025 days ago · 0 km deep · 97 km away
  40. 2.415 km ESE of Comptche, California · 14024 days ago · 7 km deep · 39 km away
  41. 2.06 km W of Cobb, California · 14023 days ago · 4 km deep · 95 km away
  42. 1.96 km W of Cobb, California · 14023 days ago · 3 km deep · 95 km away
  43. 1.513 km ESE of Laytonville, California · 14023 days ago · 9 km deep · 7 km away
  44. 1.67 km WSW of Cobb, California · 14022 days ago · 3 km deep · 96 km away
  45. 2.24 km WSW of Cobb, California · 14021 days ago · 1 km deep · 99 km away
  46. 1.76 km N of Geyserville, California · 14021 days ago · 4 km deep · 97 km away
  47. 2.16 km WNW of Cobb, California · 14021 days ago · -1 km deep · 95 km away
  48. 1.75 km W of Cobb, California · 14021 days ago · 0 km deep · 96 km away
  49. 1.86 km WSW of Cobb, California · 14021 days ago · 0 km deep · 99 km away
  50. 1.67 km SSE of Covelo, California · 14021 days ago · 0 km deep · 24 km away
  51. 1.95 km NNW of Cloverdale, California · 14021 days ago · 1 km deep · 83 km away
  52. 1.65 km WNW of Cobb, California · 14021 days ago · 0 km deep · 95 km away
  53. 2.021 km ENE of Potter Valley, California · 14021 days ago · 9 km deep · 48 km away
  54. 1.79 km WNW of Cobb, California · 14021 days ago · 1 km deep · 91 km away
  55. 1.821 km ENE of Potter Valley, California · 14020 days ago · 9 km deep · 48 km away
  56. 1.721 km NE of Leggett, California · 14020 days ago · 0 km deep · 49 km away
  57. 2.34 km W of Cobb, California · 14019 days ago · 2 km deep · 97 km away
  58. 1.77 km W of Cobb, California · 14019 days ago · 3 km deep · 96 km away
  59. 1.710 km W of Cobb, California · 14019 days ago · 1 km deep · 94 km away
  60. 1.87 km WSW of Cobb, California · 14019 days ago · 0 km deep · 97 km away

The first 60 of 154.

Before

  1. 2.45 km WSW of Cobb, California · 14045 days ago · 0 km deep · 98 km away
  2. 1.61 km SW of Hopland, California · 14046 days ago · 7 km deep · 69 km away
  3. 1.66 km W of Cobb, California · 14047 days ago · 4 km deep · 96 km away
  4. 2.216 km NE of Leggett, California · 14047 days ago · 2 km deep · 47 km away
  5. 1.56 km NNE of Cloverdale, California · 14047 days ago · 4 km deep · 85 km away
  6. 2.35 km WSW of Cobb, California · 14048 days ago · 1 km deep · 98 km away
  7. 1.56 km NE of Brooktrails, California · 14050 days ago · -1 km deep · 9 km away
  8. 3.08 km E of Willits, California · 14050 days ago · 8 km deep · 21 km away
  9. 1.68 km WNW of Laytonville, California · 14051 days ago · 3 km deep · 25 km away
  10. 2.66 km W of Cobb, California · 14053 days ago · 3 km deep · 96 km away
  11. 2.510 km SSW of Paskenta, California · 14054 days ago · 14 km deep · 71 km away
  12. 1.612 km SSE of Laytonville, California · 14054 days ago · 3 km deep · 7 km away
  13. 1.76 km WSW of Cobb, California · 14054 days ago · 2 km deep · 97 km away
  14. 2.45 km WSW of Cobb, California · 14055 days ago · 3 km deep · 98 km away
  15. 1.65 km W of Cobb, California · 14055 days ago · -1 km deep · 96 km away
  16. 3.06 km WSW of Cobb, California · 14055 days ago · 3 km deep · 97 km away
  17. 2.66 km W of Cobb, California · 14056 days ago · 4 km deep · 95 km away
  18. 1.89 km SSW of Mad River, California · 14056 days ago · 22 km deep · 93 km away
  19. 2.48 km SW of Mad River, California · 14056 days ago · 21 km deep · 93 km away
  20. 2.15 km W of Cobb, California · 14056 days ago · -1 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc115995. Read Fri, Oct 2, 2026, 9:53 PM UTC.