California earthquakes

M1.5 earthquake 6 km SW of Cobb, California

A magnitude 1.5 earthquake struck 6 km SW of Cobb, California on Mon, Mar 9, 1987, 2:20 PM PST (22:20 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M1.6 6 km SW 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
1.5 (md), micro
Local time
UTC
1987-03-09 22:20:41 UTC
Depth
2.6 km (1.6 mi), shallow
Epicenter
38.786° N, 122.781° 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, 0.6 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
81°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 1.66 km SW of Cobb, California · 14429 days ago · 1 km deep · 1 km away
  2. 1.55 km SW of Cobb, California · 14429 days ago · 1 km deep · 2 km away
  3. 1.65 km SW of Cobb, California · 14429 days ago · 3 km deep · 2 km away
  4. 1.65 km W of Cobb, California · 14429 days ago · 1 km deep · 5 km away
  5. 2.16 km SW of Cobb, California · 14429 days ago · 0 km deep · 1 km away
  6. 1.610 km W of Cobb, California · 14428 days ago · 4 km deep · 7 km away
  7. 3.17 km WSW of Cobb, California · 14428 days ago · 1 km deep · 2 km away
  8. 1.74 km W of Cobb, California · 14428 days ago · 0 km deep · 4 km away
  9. 2.37 km WSW of Cobb, California · 14427 days ago · 1 km deep · 3 km away
  10. 1.88 km W of Cobb, California · 14427 days ago · 3 km deep · 6 km away
  11. 2.08 km W of Cobb, California · 14426 days ago · 2 km deep · 6 km away
  12. 1.76 km W of Cobb, California · 14426 days ago · 1 km deep · 3 km away
  13. 1.66 km W of Cobb, California · 14426 days ago · 3 km deep · 4 km away
  14. 1.75 km WNW of Cobb, California · 14425 days ago · 1 km deep · 6 km away
  15. 1.89 km ESE of Hidden Valley Lake, California · 14425 days ago · 5 km deep · 28 km away
  16. 1.81 km WSW of Hopland, California · 14425 days ago · 0 km deep · 36 km away
  17. 1.59 km NW of Cobb, California · 14424 days ago · 1 km deep · 11 km away
  18. 2.33 km NE of Anchor Bay, California · 14424 days ago · 0 km deep · 67 km away
  19. 1.86 km W of Cobb, California · 14424 days ago · 3 km deep · 4 km away
  20. 1.6Northern California · 14423 days ago · 0 km deep · 1 km away
  21. 1.77 km W of Cobb, California · 14423 days ago · 3 km deep · 4 km away
  22. 1.65 km WSW of Cobb, California · 14423 days ago · 0 km deep · 2 km away
  23. 1.58 km W of Cobb, California · 14423 days ago · 1 km deep · 5 km away
  24. 1.70 km SSW of Larkfield-Wikiup, California · 14423 days ago · 0 km deep · 31 km away
  25. 3.05 km WSW of Cobb, California · 14423 days ago · 1 km deep · 2 km away
  26. 2.16 km WSW of Cobb, California · 14422 days ago · 0 km deep · 1 km away
  27. 2.54 km WSW of Cobb, California · 14422 days ago · -1 km deep · 2 km away
  28. 2.06 km WSW of Cobb, California · 14422 days ago · 0 km deep · 1 km away
  29. 1.55 km SW of Cobb, California · 14422 days ago · 2 km deep · 1 km away
  30. 2.95 km SW of Cobb, California · 14422 days ago · 3 km deep · 1 km away
  31. 1.95 km SW of Cobb, California · 14421 days ago · 1 km deep · 1 km away
  32. 1.76 km W of Cobb, California · 14420 days ago · 3 km deep · 3 km away
  33. 2.615 km W of Guinda, California · 14420 days ago · -1 km deep · 36 km away
  34. 1.64 km ESE of Boonville, CA · 14420 days ago · 4 km deep · 52 km away
  35. 1.84 km ESE of Boonville, California · 14420 days ago · 5 km deep · 52 km away
  36. 1.63 km ESE of Boonville, California · 14419 days ago · 5 km deep · 53 km away
  37. 2.96 km WSW of Cobb, California · 14419 days ago · 4 km deep · 3 km away
  38. 2.06 km SW of Cobb, California · 14419 days ago · -1 km deep · 0 km away
  39. 1.77 km W of Cobb, California · 14418 days ago · 0 km deep · 3 km away
  40. 1.67 km W of Cobb, California · 14418 days ago · 2 km deep · 4 km away
  41. 1.613 km ESE of Hidden Valley Lake, California · 14418 days ago · 3 km deep · 31 km away
  42. 2.16 km W of Cobb, California · 14417 days ago · 4 km deep · 4 km away
  43. 1.93 km ESE of Kenwood, California · 14417 days ago · 0 km deep · 49 km away
  44. 1.79 km W of Cobb, California · 14417 days ago · 0 km deep · 6 km away
  45. 1.84 km WSW of Cobb, California · 14416 days ago · 1 km deep · 2 km away
  46. 1.68 km W of Cobb, California · 14416 days ago · 1 km deep · 6 km away
  47. 1.64 km WSW of Cobb, California · 14416 days ago · 0 km deep · 2 km away
  48. 1.66 km SW of Cobb, California · 14415 days ago · 1 km deep · 1 km away
  49. 1.94 km WSW of Cobb, California · 14414 days ago · 2 km deep · 2 km away
  50. 1.76 km W of Cobb, California · 14413 days ago · 3 km deep · 4 km away
  51. 1.57 km WSW of Cobb, California · 14413 days ago · 3 km deep · 2 km away
  52. 1.66 km W of Cobb, California · 14413 days ago · 3 km deep · 4 km away
  53. 1.68 km WSW of Cobb, California · 14413 days ago · 3 km deep · 2 km away
  54. 1.65 km SW of Cobb, California · 14413 days ago · 0 km deep · 1 km away
  55. 1.611 km S of Kelseyville, California · 14412 days ago · 0 km deep · 12 km away
  56. 2.45 km WNW of Cobb, California · 14412 days ago · 1 km deep · 5 km away
  57. 1.8Northern California · 14412 days ago · 6 km deep · 24 km away
  58. 2.96 km ENE of Willits, California · 14411 days ago · 4 km deep · 84 km away
  59. 1.76 km ENE of Willits, California · 14411 days ago · 3 km deep · 84 km away
  60. 1.56 km ENE of Willits, California · 14411 days ago · 4 km deep · 84 km away

The first 60 of 171.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1148088. Read Tue, Sep 22, 2026, 9:01 PM UTC.