California earthquakes

M1.8 earthquake 3 km SSW of Cobb, California

A magnitude 1.8 earthquake struck 3 km SSW of Cobb, California on Mon, Sep 24, 1984, 6:04 AM PDT (13:04 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M4.3 11 km ENE of Clearlake, 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-09-24 13:04:09 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.794° N, 122.747° 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, 0.4 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
62°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 168 in the 60 days after this one and 97 in the 30 days before it.

After

  1. 1.74 km S of Cobb, California · 15347 days ago · 1 km deep · 3 km away
  2. 4.311 km ENE of Clearlake, California · 15347 days ago · 4 km deep · 30 km away
  3. 1.73 km SW of Cobb, California · 15346 days ago · 1 km deep · 0 km away
  4. 1.72 km NNE of Napa, California · 15345 days ago · 1 km deep · 67 km away
  5. 2.45 km WSW of Glen Ellen, California · 15344 days ago · 5 km deep · 52 km away
  6. 1.95 km WSW of Glen Ellen, California · 15344 days ago · 3 km deep · 52 km away
  7. 2.47 km E of Cloverdale, California · 15344 days ago · 3 km deep · 16 km away
  8. 1.713 km ESE of Hidden Valley Lake, California · 15343 days ago · 0 km deep · 29 km away
  9. 2.012 km ESE of Hidden Valley Lake, California · 15343 days ago · 12 km deep · 28 km away
  10. 1.811 km ESE of Hidden Valley Lake, California · 15343 days ago · 4 km deep · 27 km away
  11. 1.67 km E of Hidden Valley Lake, California · 15343 days ago · 6 km deep · 24 km away
  12. 1.67 km ESE of Hidden Valley Lake, California · 15343 days ago · 5 km deep · 23 km away
  13. 2.25 km ESE of Comptche, California · 15343 days ago · 0 km deep · 85 km away
  14. 1.711 km ESE of Hidden Valley Lake, California · 15343 days ago · 0 km deep · 27 km away
  15. 1.87 km ESE of Hidden Valley Lake, California · 15343 days ago · 5 km deep · 24 km away
  16. 1.815 km ESE of Hidden Valley Lake, California · 15343 days ago · 5 km deep · 30 km away
  17. 2.17 km WSW of Cobb, California · 15343 days ago · 3 km deep · 5 km away
  18. 2.04 km N of Clearlake, California · 15342 days ago · -1 km deep · 24 km away
  19. 2.07 km W of Cobb, California · 15342 days ago · 3 km deep · 6 km away
  20. 1.96 km W of Cobb, California · 15342 days ago · 3 km deep · 5 km away
  21. 2.07 km ESE of Hidden Valley Lake, California · 15342 days ago · 4 km deep · 24 km away
  22. 1.57 km SW of Calistoga, California · 15341 days ago · 5 km deep · 31 km away
  23. 1.96 km WSW of Cobb, California · 15340 days ago · 3 km deep · 5 km away
  24. 2.47 km W of Cobb, California · 15340 days ago · -1 km deep · 6 km away
  25. 1.54 km W of Cobb, California · 15340 days ago · 0 km deep · 4 km away
  26. 2.86 km W of Cobb, California · 15340 days ago · 3 km deep · 5 km away
  27. 2.45 km NW of Montalvin, California · 15338 days ago · 6 km deep · 91 km away
  28. 1.88 km NE of Hopland, California · 15337 days ago · 2 km deep · 38 km away
  29. 1.97 km W of Cobb, California · 15337 days ago · -1 km deep · 7 km away
  30. 2.94 km W of Cobb, California · 15337 days ago · 2 km deep · 4 km away
  31. 1.717 km NE of Upper Lake, California · 15336 days ago · 10 km deep · 54 km away
  32. 1.85 km SW of Cobb, California · 15336 days ago · -1 km deep · 2 km away
  33. 2.25 km SW of Cobb, California · 15336 days ago · -1 km deep · 3 km away
  34. 1.74 km WSW of Cobb, California · 15336 days ago · 1 km deep · 2 km away
  35. 2.220 km NNE of Potter Valley, California · 15335 days ago · 6 km deep · 80 km away
  36. 1.84 km S of Cobb, California · 15335 days ago · 1 km deep · 3 km away
  37. 2.32 km NE of Clear Lake Riviera, California · 15334 days ago · 0 km deep · 20 km away
  38. 1.93 km NE of Clear Lake Riviera, California · 15334 days ago · 1 km deep · 20 km away
  39. 1.82 km ENE of Clear Lake Riviera, California · 15334 days ago · 1 km deep · 20 km away
  40. 1.83 km NE of Clear Lake Riviera, California · 15334 days ago · 1 km deep · 20 km away
  41. 1.96 km W of Cobb, California · 15334 days ago · 3 km deep · 5 km away
  42. 1.97 km WSW of Cobb, California · 15334 days ago · 2 km deep · 5 km away
  43. 2.018 km ENE of Sea Ranch, California · 15333 days ago · 5 km deep · 44 km away
  44. 2.13 km NNW of Moskowite Corner, California · 15332 days ago · 0 km deep · 58 km away
  45. 1.85 km WSW of Cobb, California · 15332 days ago · 1 km deep · 3 km away
  46. 1.717 km ENE of Potter Valley, California · 15332 days ago · 8 km deep · 70 km away
  47. 1.66 km W of Cobb, California · 15331 days ago · 3 km deep · 5 km away
  48. 2.86 km WSW of Cobb, California · 15330 days ago · 1 km deep · 4 km away
  49. 1.84 km SSW of Port Costa, California · 15330 days ago · 10 km deep · 100 km away
  50. 1.58 km SE of Boonville, California · 15330 days ago · 4 km deep · 51 km away
  51. 2.12 km NNW of Hopland, California · 15330 days ago · 3 km deep · 40 km away
  52. 1.63 km ENE of Hidden Valley Lake, California · 15330 days ago · 9 km deep · 20 km away
  53. 1.87 km W of Cobb, California · 15330 days ago · 4 km deep · 6 km away
  54. 2.46 km W of Cobb, California · 15329 days ago · 3 km deep · 6 km away
  55. 1.64 km SSW of Cobb, California · 15329 days ago · -1 km deep · 2 km away
  56. 2.34 km WSW of Cobb, California · 15328 days ago · 1 km deep · 2 km away
  57. 1.62 km WNW of Fulton, California · 15328 days ago · 2 km deep · 33 km away
  58. 1.77 km W of Cobb, California · 15328 days ago · 3 km deep · 6 km away
  59. 1.66 km N of Hopland, California · 15328 days ago · 5 km deep · 41 km away
  60. 1.66 km WSW of Cobb, California · 15327 days ago · 1 km deep · 4 km away

The first 60 of 168.

Before

  1. 1.58 km W of Cobb, California · 15347 days ago · 1 km deep · 6 km away
  2. 1.64 km S of Cobb, California · 15348 days ago · 1 km deep · 3 km away
  3. 1.54 km S of Cobb, California · 15348 days ago · 2 km deep · 2 km away
  4. 1.821 km ENE of Potter Valley, California · 15348 days ago · 12 km deep · 70 km away
  5. 2.319 km SW of Elk Creek, California · 15348 days ago · -1 km deep · 78 km away
  6. 2.24 km S of Cobb, California · 15348 days ago · 2 km deep · 3 km away
  7. 1.77 km WSW of Cobb, California · 15348 days ago · 0 km deep · 6 km away
  8. 2.18 km WSW of Cobb, California · 15348 days ago · 1 km deep · 7 km away
  9. 1.88 km W of Cobb, California · 15348 days ago · -1 km deep · 7 km away
  10. 2.07 km W of Cobb, California · 15348 days ago · -1 km deep · 7 km away
  11. 4.09 km WSW of Cobb, California · 15348 days ago · 2 km deep · 7 km away
  12. 2.64 km NNE of Geyserville, California · 15349 days ago · 4 km deep · 13 km away
  13. 1.64 km SW of Cobb, California · 15349 days ago · 1 km deep · 1 km away
  14. 1.711 km SW of Hopland, California · 15350 days ago · 4 km deep · 42 km away
  15. 1.99 km W of Cobb, California · 15350 days ago · 1 km deep · 7 km away
  16. 1.68 km WSW of Cobb, California · 15351 days ago · 4 km deep · 5 km away
  17. 1.77 km SW of Calistoga, California · 15351 days ago · 5 km deep · 31 km away
  18. 1.96 km WSW of Cobb, California · 15351 days ago · 0 km deep · 3 km away
  19. 1.58 km W of Cobb, California · 15352 days ago · 0 km deep · 6 km away
  20. 1.825 km SE of Covelo, California · 15352 days ago · 5 km deep · 95 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc28549. Read Thu, Oct 1, 2026, 5:22 AM UTC.