California earthquakes

M2.4 earthquake 5 km SW of Cobb, California

A magnitude 2.4 earthquake struck 5 km SW of Cobb, California on Fri, Jul 17, 1987, 12:39 PM PDT (19:39 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.1 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
2.4 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-07-17 19:39:10 UTC
Depth
1.9 km (1.2 mi), shallow
Epicenter
38.785° N, 122.771° 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 0.1 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
38°
Stations used
33

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 119 in the 30 days before it.

After

  1. 1.64 km N of Cloverdale, California · 14321 days ago · 4 km deep · 23 km away
  2. 2.09 km W of Cobb, California · 14321 days ago · -1 km deep · 6 km away
  3. 1.79 km W of Cobb, California · 14321 days ago · -1 km deep · 6 km away
  4. 2.15 km W of Cobb, California · 14321 days ago · 0 km deep · 4 km away
  5. 1.76 km WSW of Cobb, California · 14321 days ago · 0 km deep · 3 km away
  6. 1.65 km SSW of Cobb, California · 14321 days ago · 4 km deep · 3 km away
  7. 1.76 km WSW of Cobb, California · 14321 days ago · 1 km deep · 3 km away
  8. 1.68 km WSW of Cobb, California · 14319 days ago · 3 km deep · 5 km away
  9. 1.817 km NNE of Angwin, California · 14319 days ago · 6 km deep · 34 km away
  10. 1.66 km W of Cobb, California · 14318 days ago · 2 km deep · 4 km away
  11. 1.95 km W of Cobb, California · 14318 days ago · -1 km deep · 4 km away
  12. 1.66 km W of Cobb, California · 14318 days ago · 1 km deep · 5 km away
  13. 2.55 km WSW of Cobb, California · 14318 days ago · 0 km deep · 2 km away
  14. 2.04 km SW of Cobb, California · 14318 days ago · 42 km deep · 1 km away
  15. 1.93 km NW of Hidden Valley Lake, California · 14317 days ago · 22 km deep · 17 km away
  16. 2.57 km W of Cobb, California · 14317 days ago · 1 km deep · 5 km away
  17. 1.68 km W of Cobb, California · 14317 days ago · 1 km deep · 6 km away
  18. 1.67 km W of Cobb, California · 14317 days ago · 1 km deep · 5 km away
  19. 1.9Northern California · 14317 days ago · -1 km deep · 3 km away
  20. 1.73 km ESE of Hopland, California · 14317 days ago · 1 km deep · 33 km away
  21. 1.86 km SSW of Calistoga, California · 14316 days ago · 5 km deep · 33 km away
  22. 1.74 km W of Cobb, California · 14316 days ago · 0 km deep · 5 km away
  23. 1.66 km W of Middletown, California · 14316 days ago · -1 km deep · 8 km away
  24. 3.16 km SW of Cobb, California · 14316 days ago · 0 km deep · 0 km away
  25. 2.1Northern California · 14316 days ago · 3 km deep · 5 km away
  26. 1.8Northern California · 14315 days ago · 0 km deep · 5 km away
  27. 1.86 km W of Cobb, California · 14315 days ago · 1 km deep · 5 km away
  28. 1.95 km WSW of Cobb, California · 14315 days ago · -1 km deep · 3 km away
  29. 1.87 km W of Cobb, California · 14315 days ago · 1 km deep · 6 km away
  30. 1.78 km W of Cobb, California · 14315 days ago · 0 km deep · 7 km away
  31. 1.67 km WSW of Cobb, California · 14315 days ago · 3 km deep · 3 km away
  32. 2.14 km WSW of Cobb, California · 14315 days ago · 0 km deep · 2 km away
  33. 1.63 km W of Cobb, California · 14314 days ago · -1 km deep · 4 km away
  34. 2.24 km W of Cobb, California · 14314 days ago · 1 km deep · 4 km away
  35. 1.56 km W of Cobb, California · 14314 days ago · 2 km deep · 5 km away
  36. 2.95 km SW of Cobb, California · 14314 days ago · 0 km deep · 1 km away
  37. 1.87 km W of Cobb, California · 14314 days ago · 3 km deep · 5 km away
  38. 1.85 km SSW of Potter Valley, California · 14314 days ago · 2 km deep · 63 km away
  39. 1.65 km WSW of Cobb, California · 14313 days ago · 1 km deep · 3 km away
  40. 1.76 km WSW of Cobb, California · 14313 days ago · 3 km deep · 3 km away
  41. 2.06 km W of Cobb, California · 14313 days ago · 3 km deep · 5 km away
  42. 2.0Northern California · 14313 days ago · 4 km deep · 3 km away
  43. 2.38 km W of Cobb, California · 14312 days ago · 0 km deep · 6 km away
  44. 1.64 km WNW of Cobb, California · 14311 days ago · 2 km deep · 5 km away
  45. 1.83 km NNW of Cloverdale, California · 14311 days ago · -1 km deep · 23 km away
  46. 2.24 km SW of Cobb, California · 14311 days ago · 0 km deep · 1 km away
  47. 1.66 km SSW of Cobb, California · 14310 days ago · -1 km deep · 2 km away
  48. 1.88 km W of Cobb, California · 14310 days ago · -1 km deep · 5 km away
  49. 1.85 km WSW of Cobb, California · 14310 days ago · 1 km deep · 3 km away
  50. 2.25 km W of Cobb, California · 14310 days ago · 1 km deep · 5 km away
  51. 1.66 km W of Cobb, California · 14308 days ago · 3 km deep · 4 km away
  52. 1.67 km WSW of Cobb, California · 14308 days ago · 4 km deep · 3 km away
  53. 2.08 km W of Cobb, California · 14308 days ago · 1 km deep · 6 km away
  54. 2.55 km SSW of Cobb, California · 14308 days ago · 0 km deep · 2 km away
  55. 2.75 km SSW of Cobb, California · 14308 days ago · 0 km deep · 1 km away
  56. 1.68 km W of Cobb, California · 14307 days ago · 0 km deep · 5 km away
  57. 1.64 km W of Cobb, California · 14307 days ago · 0 km deep · 5 km away
  58. 1.95 km NW of Green Valley, California · 14307 days ago · 4 km deep · 74 km away
  59. 1.76 km W of Cobb, California · 14306 days ago · 3 km deep · 5 km away
  60. 1.67 km W of Cobb, California · 14306 days ago · 1 km deep · 6 km away

The first 60 of 167.

Before

  1. 1.85 km SW of Cobb, California · 14321 days ago · -1 km deep · 1 km away
  2. 1.77 km W of Cobb, California · 14322 days ago · 3 km deep · 5 km away
  3. 1.78 km W of Cobb, California · 14322 days ago · 2 km deep · 6 km away
  4. 2.16 km WSW of Cobb, California · 14322 days ago · 1 km deep · 3 km away
  5. 1.65 km SSW of Cobb, California · 14323 days ago · 3 km deep · 1 km away
  6. 1.74 km WNW of Cobb, California · 14323 days ago · 2 km deep · 5 km away
  7. 1.84 km WNW of Cobb, California · 14323 days ago · 2 km deep · 5 km away
  8. 2.27 km WSW of Cobb, California · 14324 days ago · 0 km deep · 4 km away
  9. 1.68 km W of Cobb, California · 14324 days ago · 1 km deep · 5 km away
  10. 1.88 km W of Cobb, California · 14324 days ago · -1 km deep · 7 km away
  11. 2.58 km W of Cobb, California · 14324 days ago · 0 km deep · 6 km away
  12. 1.84 km W of Cobb, California · 14324 days ago · 0 km deep · 5 km away
  13. 2.06 km W of Cobb, California · 14324 days ago · 3 km deep · 5 km away
  14. 1.73 km W of Cobb, California · 14324 days ago · -1 km deep · 4 km away
  15. 1.86 km W of Cobb, California · 14325 days ago · -1 km deep · 4 km away
  16. 1.93 km NNW of Cloverdale, California · 14325 days ago · -1 km deep · 23 km away
  17. 2.16 km WSW of Cobb, California · 14325 days ago · 3 km deep · 4 km away
  18. 1.54 km SW of Cobb, California · 14326 days ago · 0 km deep · 1 km away
  19. 1.99 km NNE of Brooktrails, California · 14326 days ago · 9 km deep · 95 km away
  20. 2.19 km WSW of Cobb, California · 14327 days ago · 2 km deep · 5 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc103308. Read Thu, Oct 1, 2026, 8:36 PM UTC.