California earthquakes

M1.5 earthquake 9 km ENE of Brooktrails, California

A magnitude 1.5 earthquake struck 9 km ENE of Brooktrails, California on Mon, Apr 2, 1984, 10:30 PM PST (06:30 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.2 7 km W 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-04-03 06:30:33 UTC
Depth
9.5 km (5.9 mi), shallow
Epicenter
39.487° N, 123.291° 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, 0.7 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
75°
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: at least 199 in the 60 days after this one and 97 in the 30 days before it.

After

  1. 1.96 km W of Cobb, California · 15522 days ago · 3 km deep · 85 km away
  2. 1.83 km WNW of Soda Bay, California · 15521 days ago · 5 km deep · 66 km away
  3. 1.58 km WSW of Cobb, California · 15521 days ago · 3 km deep · 87 km away
  4. 2.07 km W of Cobb, California · 15521 days ago · 3 km deep · 85 km away
  5. 1.83 km WNW of Soda Bay, California · 15521 days ago · 6 km deep · 66 km away
  6. 2.86 km WSW of Cobb, California · 15520 days ago · 3 km deep · 87 km away
  7. 2.66 km W of Cobb, California · 15520 days ago · 0 km deep · 86 km away
  8. 2.06 km WSW of Cobb, California · 15520 days ago · 3 km deep · 87 km away
  9. 1.718 km NNE of Upper Lake, California · 15520 days ago · 9 km deep · 42 km away
  10. 1.78 km SE of Willits, California · 15520 days ago · -1 km deep · 15 km away
  11. 1.66 km W of Cobb, California · 15519 days ago · 3 km deep · 85 km away
  12. 1.69 km ESE of Willits, California · 15518 days ago · 6 km deep · 14 km away
  13. 2.18 km SE of Willits, California · 15518 days ago · 2 km deep · 14 km away
  14. 1.69 km WSW of Cobb, California · 15518 days ago · 2 km deep · 86 km away
  15. 1.75 km WSW of Cobb, California · 15517 days ago · 0 km deep · 88 km away
  16. 1.69 km WSW of Cobb, California · 15517 days ago · 7 km deep · 86 km away
  17. 1.87 km WSW of Cobb, California · 15517 days ago · 0 km deep · 87 km away
  18. 1.65 km E of Lakeport, California · 15516 days ago · 5 km deep · 62 km away
  19. 1.55 km SSW of Boonville, California · 15516 days ago · 1 km deep · 58 km away
  20. 1.616 km ENE of Potter Valley, California · 15515 days ago · 8 km deep · 32 km away
  21. 2.99 km SE of Willits, California · 15515 days ago · 4 km deep · 15 km away
  22. 1.63 km ENE of Brooktrails, California · 15515 days ago · 4 km deep · 6 km away
  23. 1.99 km W of Cobb, California · 15515 days ago · -1 km deep · 86 km away
  24. 1.66 km WSW of Cobb, California · 15515 days ago · 0 km deep · 87 km away
  25. 1.66 km WSW of Cobb, California · 15515 days ago · 0 km deep · 87 km away
  26. 3.06 km W of Cobb, California · 15515 days ago · 0 km deep · 86 km away
  27. 2.86 km WSW of Cobb, California · 15515 days ago · 0 km deep · 87 km away
  28. 2.57 km WSW of Cobb, California · 15515 days ago · 0 km deep · 87 km away
  29. 1.66 km S of Hopland, California · 15515 days ago · 4 km deep · 65 km away
  30. 1.77 km WSW of Cobb, California · 15515 days ago · 0 km deep · 87 km away
  31. 1.65 km W of Cobb, California · 15515 days ago · 0 km deep · 86 km away
  32. 1.98 km SE of Willits, California · 15515 days ago · 4 km deep · 14 km away
  33. 2.09 km WSW of Cobb, California · 15514 days ago · 2 km deep · 86 km away
  34. 1.75 km W of Cobb, California · 15514 days ago · 3 km deep · 86 km away
  35. 1.58 km SE of Willits, California · 15514 days ago · 6 km deep · 14 km away
  36. 1.65 km WSW of Cobb, California · 15514 days ago · 0 km deep · 89 km away
  37. 1.85 km WSW of Cobb, California · 15514 days ago · 0 km deep · 88 km away
  38. 1.68 km WSW of Cobb, California · 15513 days ago · 0 km deep · 86 km away
  39. 2.48 km WSW of Cobb, California · 15513 days ago · -1 km deep · 86 km away
  40. 2.49 km NW of Laytonville, California · 15513 days ago · 2 km deep · 37 km away
  41. 1.85 km W of Cobb, California · 15513 days ago · 0 km deep · 85 km away
  42. 2.67 km NW of Cobb, California · 15513 days ago · 3 km deep · 81 km away
  43. 2.28 km WSW of Cobb, California · 15513 days ago · 3 km deep · 87 km away
  44. 1.78 km WSW of Cobb, California · 15513 days ago · 3 km deep · 87 km away
  45. 1.66 km W of Cobb, California · 15513 days ago · 1 km deep · 84 km away
  46. 2.56 km W of Cobb, California · 15512 days ago · 1 km deep · 85 km away
  47. 2.16 km W of Cobb, California · 15512 days ago · -1 km deep · 85 km away
  48. 1.9Northern California · 15512 days ago · 0 km deep · 88 km away
  49. 1.68 km NE of Brooktrails, California · 15512 days ago · 10 km deep · 3 km away
  50. 2.86 km W of Cobb, California · 15512 days ago · 3 km deep · 86 km away
  51. 1.5Northern California · 15512 days ago · 3 km deep · 86 km away
  52. 1.621 km WSW of Paskenta, California · 15511 days ago · 4 km deep · 56 km away
  53. 2.15 km W of Cobb, California · 15510 days ago · 0 km deep · 86 km away
  54. 1.67 km W of Cobb, California · 15510 days ago · 3 km deep · 85 km away
  55. 1.59 km WSW of Cobb, California · 15510 days ago · 1 km deep · 87 km away
  56. 2.119 km NW of Paskenta, California · 15508 days ago · 8 km deep · 77 km away
  57. 2.69 km NW of Laytonville, California · 15508 days ago · -1 km deep · 37 km away
  58. 1.95 km WSW of Cobb, California · 15507 days ago · 0 km deep · 87 km away
  59. 1.77 km W of Cobb, California · 15507 days ago · 3 km deep · 85 km away
  60. 2.69 km WSW of Cobb, California · 15507 days ago · 2 km deep · 86 km away

The first 60 of at least 199.

Before

  1. 1.59 km WSW of Cobb, California · 15522 days ago · 1 km deep · 87 km away
  2. 1.67 km W of Cobb, California · 15522 days ago · 3 km deep · 86 km away
  3. 1.77 km WSW of Cobb, California · 15523 days ago · 3 km deep · 88 km away
  4. 1.66 km WSW of Cobb, California · 15523 days ago · 1 km deep · 87 km away
  5. 2.48 km W of Cobb, California · 15523 days ago · 0 km deep · 85 km away
  6. 2.0Northern California · 15524 days ago · 1 km deep · 89 km away
  7. 1.66 km W of Cobb, California · 15524 days ago · 3 km deep · 86 km away
  8. 1.65 km W of Cobb, California · 15524 days ago · 0 km deep · 87 km away
  9. 1.829 km ENE of Covelo, California · 15525 days ago · -1 km deep · 56 km away
  10. 1.720 km NE of Potter Valley, California · 15525 days ago · 5 km deep · 31 km away
  11. 1.65 km SW of Cobb, California · 15525 days ago · 1 km deep · 89 km away
  12. 1.67 km WSW of Cobb, California · 15525 days ago · 0 km deep · 87 km away
  13. 2.18 km WSW of Cobb, California · 15525 days ago · 3 km deep · 87 km away
  14. 2.39 km WSW of Cobb, California · 15525 days ago · 1 km deep · 87 km away
  15. 1.76 km W of Cobb, California · 15525 days ago · 0 km deep · 85 km away
  16. 1.55 km W of Cobb, California · 15525 days ago · 0 km deep · 85 km away
  17. 2.16 km NNE of Clearlake Oaks, California · 15525 days ago · 6 km deep · 71 km away
  18. 2.09 km W of Cobb, California · 15526 days ago · 2 km deep · 85 km away
  19. 2.26 km WSW of Cobb, California · 15526 days ago · 0 km deep · 88 km away
  20. 3.05 km WSW of Cobb, California · 15526 days ago · 0 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1113413. Read Thu, Oct 1, 2026, 9:08 PM UTC.