California earthquakes

M1.7 earthquake 5 km WNW of Cobb, California

A magnitude 1.7 earthquake struck 5 km WNW of Cobb, California on Tue, Feb 17, 1987, 9:28 AM PST (17:28 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.2 6 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-02-17 17:28:21 UTC
Depth
1.1 km (0.7 mi), shallow
Epicenter
38.836° N, 122.784° 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, 0.6 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
62°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 175 in the 60 days after this one and 83 in the 30 days before it.

After

  1. 1.86 km W of Cobb, California · 14471 days ago · 3 km deep · 2 km away
  2. 1.97 km W of Cobb, California · 14471 days ago · 1 km deep · 3 km away
  3. 2.06 km SW of Cobb, California · 14471 days ago · 2 km deep · 6 km away
  4. 2.06 km W of Cobb, California · 14470 days ago · 4 km deep · 2 km away
  5. 3.111 km NNE of Comptche, California · 14470 days ago · 2 km deep · 87 km away
  6. 1.69 km ESE of Hidden Valley Lake, California · 14470 days ago · 7 km deep · 29 km away
  7. 1.86 km SW of Cobb, California · 14469 days ago · 3 km deep · 5 km away
  8. 2.19 km W of Cobb, California · 14469 days ago · 1 km deep · 5 km away
  9. 1.74 km W of Cobb, California · 14469 days ago · -1 km deep · 2 km away
  10. 1.77 km W of Cobb, California · 14469 days ago · 3 km deep · 4 km away
  11. 2.56 km W of Cobb, California · 14468 days ago · 2 km deep · 2 km away
  12. 2.36 km W of Cobb, California · 14468 days ago · 2 km deep · 1 km away
  13. 1.79 km WSW of Cobb, California · 14468 days ago · 2 km deep · 5 km away
  14. 1.76 km WSW of Cobb, California · 14468 days ago · 3 km deep · 4 km away
  15. 1.52 km SSE of Cobb, California · 14468 days ago · 4 km deep · 7 km away
  16. 1.710 km NW of Cobb, California · 14468 days ago · 1 km deep · 6 km away
  17. 1.81 km W of Cobb, California · 14467 days ago · 4 km deep · 4 km away
  18. 1.59 km W of Cobb, California · 14467 days ago · 0 km deep · 5 km away
  19. 2.16 km W of Cobb, California · 14466 days ago · 3 km deep · 2 km away
  20. 2.13 km SW of Cobb, California · 14466 days ago · 1 km deep · 6 km away
  21. 2.47 km WSW of Cobb, California · 14465 days ago · 1 km deep · 4 km away
  22. 2.04 km SW of Cobb, California · 14465 days ago · 1 km deep · 5 km away
  23. 1.96 km W of Cobb, California · 14465 days ago · 3 km deep · 2 km away
  24. 1.76 km WSW of Cobb, California · 14465 days ago · 4 km deep · 3 km away
  25. 1.84 km WSW of Cobb, California · 14464 days ago · 1 km deep · 3 km away
  26. 1.89 km W of Cobb, California · 14464 days ago · -1 km deep · 5 km away
  27. 2.117 km SW of Cloverdale, California · 14464 days ago · 14 km deep · 36 km away
  28. 1.95 km WNW of Cobb, California · 14463 days ago · 0 km deep · 0 km away
  29. 1.67 km WSW of Cobb, California · 14463 days ago · 1 km deep · 4 km away
  30. 1.65 km SW of Cobb, California · 14463 days ago · -1 km deep · 6 km away
  31. 1.64 km ESE of Philo, California · 14463 days ago · 6 km deep · 58 km away
  32. 2.021 km NE of Potter Valley, California · 14463 days ago · 11 km deep · 71 km away
  33. 2.19 km NW of Bayview, California · 14463 days ago · 6 km deep · 93 km away
  34. 1.8Northern California · 14462 days ago · 4 km deep · 62 km away
  35. 1.84 km WNW of Cobb, California · 14462 days ago · 2 km deep · 1 km away
  36. 1.520 km ENE of Potter Valley, California · 14462 days ago · 4 km deep · 62 km away
  37. 3.26 km W of Cobb, California · 14461 days ago · 3 km deep · 2 km away
  38. 2.55 km SW of Cobb, California · 14460 days ago · 1 km deep · 5 km away
  39. 2.05 km SW of Cobb, California · 14459 days ago · 1 km deep · 6 km away
  40. 2.34 km W of Cobb, California · 14459 days ago · 1 km deep · 1 km away
  41. 1.918 km ENE of Potter Valley, California · 14459 days ago · 7 km deep · 59 km away
  42. 1.95 km WSW of Cobb, California · 14459 days ago · 1 km deep · 4 km away
  43. 1.68 km WSW of Cobb, California · 14459 days ago · 0 km deep · 4 km away
  44. 1.66 km WSW of Cobb, California · 14458 days ago · 3 km deep · 3 km away
  45. 2.09 km W of Cobb, California · 14458 days ago · -1 km deep · 5 km away
  46. 2.518 km ENE of Potter Valley, California · 14458 days ago · 6 km deep · 61 km away
  47. 1.912 km SE of Laytonville, California · 14457 days ago · 6 km deep · 100 km away
  48. 2.14 km SW of Cobb, California · 14457 days ago · 1 km deep · 6 km away
  49. 2.3Northern California · 14456 days ago · 1 km deep · 1 km away
  50. 1.77 km W of Cobb, California · 14456 days ago · 0 km deep · 4 km away
  51. 2.07 km WSW of Cobb, California · 14455 days ago · 1 km deep · 4 km away
  52. 1.72 km SSE of Clear Lake Riviera, CA · 14455 days ago · -1 km deep · 13 km away
  53. 2.64 km W of Cobb, California · 14455 days ago · 1 km deep · 2 km away
  54. 1.75 km W of Cobb, California · 14455 days ago · 1 km deep · 1 km away
  55. 1.76 km W of Cobb, California · 14454 days ago · 3 km deep · 3 km away
  56. 1.78 km WSW of Cobb, California · 14454 days ago · 3 km deep · 5 km away
  57. 2.611 km SE of Hopland, California · 14453 days ago · 4 km deep · 22 km away
  58. 2.88 km W of Cobb, California · 14453 days ago · -1 km deep · 4 km away
  59. 1.610 km ENE of Hidden Valley Lake, California · 14453 days ago · 2 km deep · 28 km away
  60. 1.96 km W of Cobb, California · 14453 days ago · 1 km deep · 3 km away

The first 60 of 175.

Before

  1. 1.65 km WNW of Cobb, California · 14471 days ago · 1 km deep · 0 km away
  2. 1.90 km S of Fulton, California · 14471 days ago · 6 km deep · 39 km away
  3. 1.823 km NE of Potter Valley, California · 14472 days ago · 5 km deep · 70 km away
  4. 1.56 km W of Cobb, California · 14472 days ago · 3 km deep · 2 km away
  5. 1.82 km E of Forestville, California · 14473 days ago · 2 km deep · 41 km away
  6. 2.36 km W of Cobb, California · 14474 days ago · 3 km deep · 2 km away
  7. 1.68 km WSW of Cobb, California · 14474 days ago · 4 km deep · 5 km away
  8. 2.510 km NW of Cobb, California · 14474 days ago · 0 km deep · 6 km away
  9. 2.04 km W of Cobb, California · 14474 days ago · 0 km deep · 2 km away
  10. 2.014 km ENE of Angwin, California · 14475 days ago · 9 km deep · 47 km away
  11. 1.85 km SW of Cobb, California · 14476 days ago · 2 km deep · 7 km away
  12. 3.16 km W of Cobb, California · 14476 days ago · 1 km deep · 1 km away
  13. 1.76 km W of Cobb, California · 14476 days ago · 0 km deep · 1 km away
  14. 2.96 km W of Cobb, California · 14476 days ago · 0 km deep · 1 km away
  15. 1.67 km W of Kenwood, California · 14476 days ago · 6 km deep · 48 km away
  16. 2.05 km WSW of Cobb, California · 14477 days ago · 0 km deep · 4 km away
  17. 1.88 km WNW of Cobb, California · 14477 days ago · -1 km deep · 3 km away
  18. 1.66 km WNW of Cobb, California · 14477 days ago · -1 km deep · 1 km away
  19. 1.97 km WSW of Cobb, California · 14477 days ago · 1 km deep · 4 km away
  20. 1.67 km WSW of Cobb, California · 14477 days ago · 1 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc94947. Read Thu, Oct 1, 2026, 7:43 PM UTC.