California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Wed, Sep 12, 1984, 4:44 PM PDT (23:44 UTC), 3 km (2 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
1984-09-12 23:44:37 UTC
Depth
2.9 km (1.8 mi), shallow
Epicenter
38.819° N, 122.796° 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
±0.14
Depth from
From location
Station coverage gap
78°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 165 in the 60 days after this one and 80 in the 30 days before it.

After

  1. 1.65 km SSW of Philo, California · 15360 days ago · -1 km deep · 62 km away
  2. 1.92 km ESE of Deer Park, California · 15360 days ago · 0 km deep · 45 km away
  3. 2.1Northern California · 15359 days ago · 11 km deep · 36 km away
  4. 4.110 km W of Philo, California · 15359 days ago · 14 km deep · 71 km away
  5. 2.24 km W of Vallejo, California · 15358 days ago · 8 km deep · 90 km away
  6. 1.56 km WSW of Cobb, California · 15358 days ago · 3 km deep · 2 km away
  7. 1.87 km W of Cobb, California · 15357 days ago · 3 km deep · 1 km away
  8. 1.77 km W of Cobb, California · 15357 days ago · 2 km deep · 1 km away
  9. 1.66 km SW of Eldridge, California · 15356 days ago · 5 km deep · 60 km away
  10. 2.16 km ENE of Rohnert Park, California · 15356 days ago · 4 km deep · 54 km away
  11. 1.912 km W of Cobb, California · 15356 days ago · -1 km deep · 6 km away
  12. 1.55 km W of Cobb, California · 15356 days ago · 1 km deep · 1 km away
  13. 2.24 km SE of Clearlake Oaks, California · 15355 days ago · -1 km deep · 24 km away
  14. 1.724 km NNE of Potter Valley, California · 15355 days ago · 3 km deep · 80 km away
  15. 1.70 km WNW of Kelseyville, California · 15354 days ago · -1 km deep · 18 km away
  16. 1.64 km SSE of Clear Lake Riviera, California · 15354 days ago · -1 km deep · 14 km away
  17. 1.825 km SE of Covelo, California · 15354 days ago · 5 km deep · 91 km away
  18. 1.58 km W of Cobb, California · 15354 days ago · 0 km deep · 2 km away
  19. 1.96 km WSW of Cobb, California · 15353 days ago · 0 km deep · 3 km away
  20. 1.77 km SW of Calistoga, California · 15353 days ago · 5 km deep · 35 km away
  21. 1.68 km WSW of Cobb, California · 15352 days ago · 4 km deep · 3 km away
  22. 1.99 km W of Cobb, California · 15352 days ago · 1 km deep · 3 km away
  23. 1.711 km SW of Hopland, California · 15352 days ago · 4 km deep · 38 km away
  24. 1.64 km SW of Cobb, California · 15351 days ago · 1 km deep · 5 km away
  25. 2.64 km NNE of Geyserville, California · 15351 days ago · 4 km deep · 11 km away
  26. 4.09 km WSW of Cobb, California · 15350 days ago · 2 km deep · 3 km away
  27. 2.07 km W of Cobb, California · 15350 days ago · -1 km deep · 2 km away
  28. 1.88 km W of Cobb, California · 15350 days ago · -1 km deep · 2 km away
  29. 2.18 km WSW of Cobb, California · 15350 days ago · 1 km deep · 3 km away
  30. 1.77 km WSW of Cobb, California · 15350 days ago · 0 km deep · 2 km away
  31. 2.24 km S of Cobb, California · 15350 days ago · 2 km deep · 8 km away
  32. 2.319 km SW of Elk Creek, California · 15350 days ago · -1 km deep · 75 km away
  33. 1.821 km ENE of Potter Valley, California · 15350 days ago · 12 km deep · 67 km away
  34. 1.54 km S of Cobb, California · 15350 days ago · 2 km deep · 8 km away
  35. 1.64 km S of Cobb, California · 15350 days ago · 1 km deep · 8 km away
  36. 1.58 km W of Cobb, California · 15349 days ago · 1 km deep · 2 km away
  37. 1.83 km SSW of Cobb, California · 15349 days ago · 1 km deep · 5 km away
  38. 1.74 km S of Cobb, California · 15349 days ago · 1 km deep · 8 km away
  39. 4.311 km ENE of Clearlake, California · 15349 days ago · 4 km deep · 32 km away
  40. 1.73 km SW of Cobb, California · 15347 days ago · 1 km deep · 5 km away
  41. 1.72 km NNE of Napa, California · 15346 days ago · 1 km deep · 72 km away
  42. 2.45 km WSW of Glen Ellen, California · 15346 days ago · 5 km deep · 56 km away
  43. 1.95 km WSW of Glen Ellen, California · 15346 days ago · 3 km deep · 56 km away
  44. 2.47 km E of Cloverdale, California · 15345 days ago · 3 km deep · 12 km away
  45. 1.713 km ESE of Hidden Valley Lake, California · 15345 days ago · 0 km deep · 33 km away
  46. 2.012 km ESE of Hidden Valley Lake, California · 15345 days ago · 12 km deep · 33 km away
  47. 1.811 km ESE of Hidden Valley Lake, California · 15345 days ago · 4 km deep · 32 km away
  48. 1.67 km E of Hidden Valley Lake, California · 15345 days ago · 6 km deep · 28 km away
  49. 1.67 km ESE of Hidden Valley Lake, California · 15345 days ago · 5 km deep · 27 km away
  50. 2.25 km ESE of Comptche, California · 15345 days ago · 0 km deep · 80 km away
  51. 1.711 km ESE of Hidden Valley Lake, California · 15345 days ago · 0 km deep · 31 km away
  52. 1.87 km ESE of Hidden Valley Lake, California · 15345 days ago · 5 km deep · 28 km away
  53. 1.815 km ESE of Hidden Valley Lake, California · 15345 days ago · 5 km deep · 35 km away
  54. 2.17 km WSW of Cobb, California · 15345 days ago · 3 km deep · 2 km away
  55. 2.04 km N of Clearlake, California · 15344 days ago · -1 km deep · 24 km away
  56. 2.07 km W of Cobb, California · 15344 days ago · 3 km deep · 1 km away
  57. 1.96 km W of Cobb, California · 15344 days ago · 3 km deep · 0 km away
  58. 2.07 km ESE of Hidden Valley Lake, California · 15344 days ago · 4 km deep · 28 km away
  59. 1.57 km SW of Calistoga, California · 15343 days ago · 5 km deep · 35 km away
  60. 1.96 km WSW of Cobb, California · 15342 days ago · 3 km deep · 2 km away

The first 60 of 165.

Before

  1. 2.24 km SSW of Green Valley, California · 15360 days ago · 6 km deep · 86 km away
  2. 2.36 km W of Cobb, California · 15361 days ago · 2 km deep · 1 km away
  3. 1.86 km W of Cobb, California · 15361 days ago · 4 km deep · 1 km away
  4. 1.67 km WSW of Cobb, California · 15361 days ago · 2 km deep · 2 km away
  5. 1.96 km W of Cobb, California · 15362 days ago · 3 km deep · 1 km away
  6. 1.78 km WSW of Cobb, California · 15362 days ago · 0 km deep · 3 km away
  7. 1.86 km W of Cobb, California · 15363 days ago · 0 km deep · 1 km away
  8. 1.98 km W of Cobb, California · 15364 days ago · -1 km deep · 2 km away
  9. 1.63 km NNE of Larkfield-Wikiup, California · 15364 days ago · 7 km deep · 31 km away
  10. 1.86 km W of Cobb, California · 15364 days ago · 3 km deep · 1 km away
  11. 2.15 km SW of Cobb, California · 15364 days ago · 0 km deep · 4 km away
  12. 1.85 km SW of Cobb, California · 15364 days ago · -1 km deep · 3 km away
  13. 3.05 km SW of Cobb, California · 15364 days ago · 0 km deep · 4 km away
  14. 1.710 km WNW of Williams, California · 15364 days ago · 4 km deep · 61 km away
  15. 1.95 km SW of Cobb, California · 15365 days ago · 0 km deep · 4 km away
  16. 1.93 km NNE of Talmage, California · 15365 days ago · 6 km deep · 49 km away
  17. 2.116 km E of Angwin, California · 15366 days ago · 7 km deep · 53 km away
  18. 2.09 km SE of Hopland, California · 15367 days ago · 0 km deep · 23 km away
  19. 1.88 km W of Cobb, California · 15367 days ago · 1 km deep · 2 km away
  20. 1.65 km SW of Moskowite Corner, California · 15368 days ago · 0 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc27832. Read Sat, Oct 3, 2026, 3:55 AM UTC.