California earthquakes

M1.8 earthquake 7 km WSW of Cobb, California

A magnitude 1.8 earthquake struck 7 km WSW of Cobb, California on Thu, Apr 26, 1984, 11:09 PM PST (07:09 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.2 7 km W of Cobb, 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
1984-04-27 07:09:34 UTC
Depth
3.7 km (2.3 mi), shallow
Epicenter
38.795° N, 122.800° 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
±0.13
Depth from
From location
Station coverage gap
99°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 170 in the 60 days after this one and 120 in the 30 days before it.

After

  1. 1.67 km WSW of Cobb, California · 15500 days ago · 3 km deep · 1 km away
  2. 1.97 km WSW of Cobb, California · 15500 days ago · 3 km deep · 1 km away
  3. 2.55 km S of Calistoga, California · 15499 days ago · 3 km deep · 35 km away
  4. 1.6near the coast of Northern California · 15499 days ago · 9 km deep · 75 km away
  5. 2.215 km ESE of Hidden Valley Lake, California · 15499 days ago · 1 km deep · 36 km away
  6. 1.55 km SW of Cobb, California · 15498 days ago · 1 km deep · 2 km away
  7. 1.86 km W of Cobb, California · 15498 days ago · 0 km deep · 3 km away
  8. 1.6near the coast of Northern California · 15497 days ago · 4 km deep · 44 km away
  9. 3.27 km W of Cobb, California · 15497 days ago · 4 km deep · 2 km away
  10. 1.77 km W of Cobb, California · 15497 days ago · 4 km deep · 2 km away
  11. 2.17 km W of Cobb, California · 15497 days ago · 4 km deep · 2 km away
  12. 2.117 km NNE of Nice, California · 15497 days ago · 8 km deep · 52 km away
  13. 2.57 km W of Cobb, California · 15497 days ago · 3 km deep · 3 km away
  14. 1.63 km NE of Talmage, California · 15497 days ago · 7 km deep · 50 km away
  15. 1.86 km W of Cobb, California · 15496 days ago · 1 km deep · 2 km away
  16. 1.69 km SW of Lakeport, California · 15495 days ago · 0 km deep · 26 km away
  17. 1.86 km WSW of Cobb, California · 15495 days ago · 1 km deep · 1 km away
  18. 1.71 km ESE of Talmage, California · 15495 days ago · 8 km deep · 48 km away
  19. 1.76 km ESE of Lucerne, California · 15494 days ago · 3 km deep · 32 km away
  20. 1.86 km WSW of Cobb, California · 15494 days ago · 3 km deep · 1 km away
  21. 1.87 km W of Cobb, California · 15494 days ago · 3 km deep · 3 km away
  22. 1.66 km W of Cobb, California · 15494 days ago · 3 km deep · 3 km away
  23. 1.66 km W of Potter Valley, California · 15494 days ago · 11 km deep · 68 km away
  24. 1.77 km W of Cobb, California · 15494 days ago · 3 km deep · 2 km away
  25. 2.213 km N of Brooktrails, California · 15493 days ago · 7 km deep · 99 km away
  26. 1.67 km WSW of Cobb, California · 15493 days ago · 3 km deep · 1 km away
  27. 1.68 km WSW of Cobb, California · 15492 days ago · 3 km deep · 1 km away
  28. 1.68 km WSW of Cobb, California · 15491 days ago · 4 km deep · 2 km away
  29. 2.87 km W of Cobb, California · 15491 days ago · 3 km deep · 4 km away
  30. 1.52 km E of Calpella, California · 15491 days ago · 4 km deep · 59 km away
  31. 2.16 km W of Cobb, California · 15491 days ago · 3 km deep · 3 km away
  32. 1.56 km W of Potter Valley, California · 15491 days ago · 8 km deep · 69 km away
  33. 2.47 km WSW of Cobb, California · 15490 days ago · 0 km deep · 1 km away
  34. 2.75 km WSW of Vacaville, California · 15490 days ago · 32 km deep · 84 km away
  35. 2.17 km W of Cobb, California · 15490 days ago · 2 km deep · 2 km away
  36. 1.67 km W of Cobb, California · 15490 days ago · 1 km deep · 2 km away
  37. 2.25 km SW of Cobb, California · 15489 days ago · 0 km deep · 3 km away
  38. 1.60 km NE of Larkfield-Wikiup, California · 15489 days ago · 3 km deep · 31 km away
  39. 1.77 km W of Cobb, California · 15488 days ago · 4 km deep · 3 km away
  40. 1.76 km SW of Cobb, California · 15488 days ago · 0 km deep · 3 km away
  41. 1.87 km W of Cobb, California · 15488 days ago · 3 km deep · 2 km away
  42. 1.56 km W of Cobb, California · 15488 days ago · 2 km deep · 4 km away
  43. 1.59 km W of Cobb, California · 15487 days ago · 2 km deep · 3 km away
  44. 1.88 km SE of Willits, California · 15487 days ago · 4 km deep · 75 km away
  45. 1.77 km WSW of Cobb, California · 15486 days ago · 3 km deep · 1 km away
  46. 2.25 km ESE of Manchester, California · 15485 days ago · 0 km deep · 74 km away
  47. 1.86 km W of Cobb, California · 15484 days ago · 3 km deep · 3 km away
  48. 1.73 km N of Clearlake, California · 15484 days ago · 0 km deep · 26 km away
  49. 1.620 km NNE of Upper Lake, California · 15484 days ago · 6 km deep · 61 km away
  50. 1.66 km WSW of Cobb, California · 15483 days ago · 3 km deep · 2 km away
  51. 1.75 km WSW of Rutherford, California · 15483 days ago · 0 km deep · 48 km away
  52. 1.77 km WSW of Cobb, California · 15482 days ago · 3 km deep · 0 km away
  53. 1.816 km ENE of Potter Valley, California · 15482 days ago · 6 km deep · 68 km away
  54. 2.34 km SW of Cobb, California · 15481 days ago · 0 km deep · 4 km away
  55. 1.67 km W of Cobb, California · 15481 days ago · 3 km deep · 2 km away
  56. 1.96 km W of Cobb, California · 15481 days ago · 2 km deep · 2 km away
  57. 1.66 km W of Cobb, California · 15481 days ago · 3 km deep · 3 km away
  58. 1.67 km WSW of Cobb, California · 15480 days ago · 2 km deep · 2 km away
  59. 1.96 km W of Cobb, California · 15480 days ago · 3 km deep · 2 km away
  60. 2.37 km WSW of Cobb, California · 15480 days ago · 0 km deep · 1 km away

The first 60 of 170.

Before

  1. 3.06 km W of Cobb, California · 15501 days ago · 3 km deep · 3 km away
  2. 1.54 km W of Cobb, California · 15501 days ago · 0 km deep · 4 km away
  3. 1.76 km ESE of Willits, California · 15502 days ago · -1 km deep · 77 km away
  4. 1.615 km ENE of Potter Valley, California · 15502 days ago · 4 km deep · 67 km away
  5. 2.216 km ENE of Hidden Valley Lake, California · 15502 days ago · 2 km deep · 37 km away
  6. 2.68 km WSW of Cobb, California · 15503 days ago · 1 km deep · 2 km away
  7. 1.72 km W of Cobb, California · 15503 days ago · -1 km deep · 5 km away
  8. 1.87 km WSW of Cobb, California · 15503 days ago · 3 km deep · 1 km away
  9. 2.25 km W of Cobb, California · 15504 days ago · 0 km deep · 3 km away
  10. 1.74 km W of Cobb, California · 15504 days ago · 0 km deep · 3 km away
  11. 1.69 km WSW of Cobb, California · 15504 days ago · 2 km deep · 2 km away
  12. 1.98 km W of Cobb, California · 15505 days ago · 0 km deep · 4 km away
  13. 1.95 km W of Cobb, California · 15506 days ago · 0 km deep · 4 km away
  14. 2.03 km WNW of Soda Bay, California · 15506 days ago · 4 km deep · 25 km away
  15. 1.76 km W of Cobb, California · 15507 days ago · 0 km deep · 3 km away
  16. 2.15 km WSW of Cobb, California · 15507 days ago · 1 km deep · 2 km away
  17. 2.05 km WSW of Cobb, California · 15507 days ago · 0 km deep · 2 km away
  18. 2.08 km NE of Hidden Valley Lake, California · 15508 days ago · -1 km deep · 28 km away
  19. 2.05 km WSW of Cobb, California · 15508 days ago · 0 km deep · 2 km away
  20. 1.85 km WSW of Cobb, California · 15508 days ago · 0 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc16748. Read Sun, Oct 4, 2026, 11:54 PM UTC.