California earthquakes

M1.6 earthquake 6 km W of Cobb, California

A magnitude 1.6 earthquake struck 6 km W of Cobb, California on Sun, Sep 2, 1984, 5:39 PM PDT (00:39 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-09-03 00:39:28 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
38.817° N, 122.797° 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, 0.5 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
77°
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: 167 in the 60 days after this one and 77 in the 30 days before it.

After

  1. 2.215 km ESE of Hidden Valley Lake, California · 15370 days ago · 0 km deep · 36 km away
  2. 2.75 km N of Redwood Valley, California · 15370 days ago · 42 km deep · 65 km away
  3. 1.65 km W of Cobb, California · 15369 days ago · 0 km deep · 1 km away
  4. 1.65 km SW of Moskowite Corner, California · 15368 days ago · 0 km deep · 67 km away
  5. 1.88 km W of Cobb, California · 15367 days ago · 1 km deep · 2 km away
  6. 2.09 km SE of Hopland, California · 15367 days ago · 0 km deep · 23 km away
  7. 2.116 km E of Angwin, California · 15366 days ago · 7 km deep · 53 km away
  8. 1.93 km NNE of Talmage, California · 15365 days ago · 6 km deep · 49 km away
  9. 1.95 km SW of Cobb, California · 15365 days ago · 0 km deep · 4 km away
  10. 1.710 km WNW of Williams, California · 15364 days ago · 4 km deep · 61 km away
  11. 3.05 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. 2.15 km SW of Cobb, California · 15364 days ago · 0 km deep · 4 km away
  14. 1.86 km W of Cobb, California · 15364 days ago · 3 km deep · 1 km away
  15. 1.63 km NNE of Larkfield-Wikiup, California · 15364 days ago · 7 km deep · 31 km away
  16. 1.98 km W of Cobb, California · 15364 days ago · -1 km deep · 2 km away
  17. 1.86 km W of Cobb, California · 15363 days ago · 0 km deep · 1 km away
  18. 1.78 km WSW of Cobb, California · 15362 days ago · 0 km deep · 3 km away
  19. 1.96 km W of Cobb, California · 15362 days ago · 3 km deep · 1 km away
  20. 1.67 km WSW of Cobb, California · 15361 days ago · 2 km deep · 2 km away
  21. 1.86 km W of Cobb, California · 15361 days ago · 4 km deep · 1 km away
  22. 2.36 km W of Cobb, California · 15361 days ago · 2 km deep · 0 km away
  23. 2.24 km SSW of Green Valley, California · 15360 days ago · 6 km deep · 86 km away
  24. 1.86 km W of Cobb, California · 15360 days ago · 3 km deep · 0 km away
  25. 1.65 km SSW of Philo, California · 15360 days ago · -1 km deep · 62 km away
  26. 1.92 km ESE of Deer Park, California · 15360 days ago · 0 km deep · 45 km away
  27. 2.1Northern California · 15359 days ago · 11 km deep · 36 km away
  28. 4.110 km W of Philo, California · 15359 days ago · 14 km deep · 71 km away
  29. 2.24 km W of Vallejo, California · 15358 days ago · 8 km deep · 90 km away
  30. 1.56 km WSW of Cobb, California · 15358 days ago · 3 km deep · 2 km away
  31. 1.87 km W of Cobb, California · 15357 days ago · 3 km deep · 1 km away
  32. 1.77 km W of Cobb, California · 15357 days ago · 2 km deep · 1 km away
  33. 1.66 km SW of Eldridge, California · 15357 days ago · 5 km deep · 59 km away
  34. 2.16 km ENE of Rohnert Park, California · 15356 days ago · 4 km deep · 54 km away
  35. 1.912 km W of Cobb, California · 15356 days ago · -1 km deep · 6 km away
  36. 1.55 km W of Cobb, California · 15356 days ago · 1 km deep · 1 km away
  37. 2.24 km SE of Clearlake Oaks, California · 15355 days ago · -1 km deep · 24 km away
  38. 1.724 km NNE of Potter Valley, California · 15355 days ago · 3 km deep · 80 km away
  39. 1.70 km WNW of Kelseyville, California · 15354 days ago · -1 km deep · 18 km away
  40. 1.64 km SSE of Clear Lake Riviera, California · 15354 days ago · -1 km deep · 14 km away
  41. 1.825 km SE of Covelo, California · 15354 days ago · 5 km deep · 91 km away
  42. 1.58 km W of Cobb, California · 15354 days ago · 0 km deep · 2 km away
  43. 1.96 km WSW of Cobb, California · 15353 days ago · 0 km deep · 3 km away
  44. 1.77 km SW of Calistoga, California · 15353 days ago · 5 km deep · 35 km away
  45. 1.68 km WSW of Cobb, California · 15352 days ago · 4 km deep · 3 km away
  46. 1.99 km W of Cobb, California · 15352 days ago · 1 km deep · 3 km away
  47. 1.711 km SW of Hopland, California · 15352 days ago · 4 km deep · 38 km away
  48. 1.64 km SW of Cobb, California · 15351 days ago · 1 km deep · 5 km away
  49. 2.64 km NNE of Geyserville, California · 15351 days ago · 4 km deep · 11 km away
  50. 4.09 km WSW of Cobb, California · 15350 days ago · 2 km deep · 3 km away
  51. 2.07 km W of Cobb, California · 15350 days ago · -1 km deep · 2 km away
  52. 1.88 km W of Cobb, California · 15350 days ago · -1 km deep · 2 km away
  53. 2.18 km WSW of Cobb, California · 15350 days ago · 1 km deep · 3 km away
  54. 1.77 km WSW of Cobb, California · 15350 days ago · 0 km deep · 2 km away
  55. 2.24 km S of Cobb, California · 15350 days ago · 2 km deep · 8 km away
  56. 2.319 km SW of Elk Creek, California · 15350 days ago · -1 km deep · 76 km away
  57. 1.821 km ENE of Potter Valley, California · 15350 days ago · 12 km deep · 67 km away
  58. 1.54 km S of Cobb, California · 15350 days ago · 2 km deep · 8 km away
  59. 1.64 km S of Cobb, California · 15350 days ago · 1 km deep · 8 km away
  60. 1.58 km W of Cobb, California · 15349 days ago · 1 km deep · 2 km away

The first 60 of 167.

Before

  1. 1.56 km W of Cobb, California · 15371 days ago · 1 km deep · 1 km away
  2. 1.77 km ENE of Willits, California · 15371 days ago · 5 km deep · 80 km away
  3. 1.811 km SW of Hopland, California · 15371 days ago · 4 km deep · 37 km away
  4. 1.67 km ENE of Willits, California · 15371 days ago · 4 km deep · 80 km away
  5. 1.67 km ENE of Willits, California · 15371 days ago · 3 km deep · 79 km away
  6. 1.67 km ENE of Willits, California · 15371 days ago · 4 km deep · 80 km away
  7. 1.76 km W of Cobb, California · 15372 days ago · 1 km deep · 2 km away
  8. 2.34 km WNW of Lucas Valley-Marinwood, California · 15372 days ago · 3 km deep · 86 km away
  9. 2.416 km W of Williams, California · 15373 days ago · 1 km deep · 54 km away
  10. 1.57 km W of Cobb, California · 15373 days ago · 5 km deep · 1 km away
  11. 1.58 km W of Cobb, California · 15373 days ago · 1 km deep · 2 km away
  12. 2.04 km NE of Clearlake, California · 15374 days ago · 2 km deep · 26 km away
  13. 1.919 km NNE of Upper Lake, California · 15374 days ago · 5 km deep · 57 km away
  14. 2.022 km SSE of Covelo, California · 15374 days ago · 3 km deep · 94 km away
  15. 1.51 km NNW of Calpella, California · 15374 days ago · 6 km deep · 59 km away
  16. 1.710 km WSW of Cobb, California · 15374 days ago · 2 km deep · 4 km away
  17. 2.010 km WSW of Cobb, California · 15374 days ago · 2 km deep · 4 km away
  18. 1.610 km SW of Hopland, California · 15375 days ago · 4 km deep · 37 km away
  19. 1.66 km WSW of Cobb, California · 15375 days ago · 3 km deep · 1 km away
  20. 2.46 km WSW of Cobb, California · 15375 days ago · 3 km deep · 1 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc27042. Read Sat, Oct 3, 2026, 5:04 AM UTC.