California earthquakes

M1.7 earthquake 3 km NW of Sunol, California

A magnitude 1.7 earthquake struck 3 km NW of Sunol, California on Wed, Apr 8, 1987, 8:48 PM PDT (03:48 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.3 10 km ESE of East Foothills, California. This one was a foreshock.

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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), micro
Local time
UTC
1987-04-09 03:48:18 UTC
Depth
3.4 km (2.1 mi), shallow
Epicenter
37.619° N, 121.911° 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
±0.12
Depth from
From location
Station coverage gap
41°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 47 in the 30 days before it.

After

  1. 1.519 km NE of East Foothills, California · 14411 days ago · 7 km deep · 24 km away
  2. 2.310 km ESE of East Foothills, California · 14410 days ago · 8 km deep · 35 km away
  3. 3.415 km SSE of Livermore, California · 14410 days ago · 4 km deep · 21 km away
  4. 2.610 km ESE of East Foothills, California · 14410 days ago · 7 km deep · 35 km away
  5. 2.113 km ENE of East Foothills, California · 14410 days ago · 7 km deep · 28 km away
  6. 1.713 km ENE of East Foothills, California · 14409 days ago · 7 km deep · 29 km away
  7. 2.417 km SSE of Livermore, California · 14408 days ago · 2 km deep · 23 km away
  8. 2.03 km ESE of Seven Trees, California · 14407 days ago · 7 km deep · 40 km away
  9. 3.02 km W of Hollister, California · 14407 days ago · 5 km deep · 96 km away
  10. 3.314 km N of Morgan Hill, California · 14407 days ago · 4 km deep · 47 km away
  11. 1.52 km WSW of Cambrian Park, California · 14405 days ago · 6 km deep · 41 km away
  12. 1.610 km ESE of Seven Trees, California · 14403 days ago · 2 km deep · 45 km away
  13. 1.85 km ENE of Hollister, California · 14403 days ago · 7 km deep · 96 km away
  14. 2.36 km NNE of East Foothills, California · 14402 days ago · 5 km deep · 24 km away
  15. 1.81 km ENE of Walnut Creek, California · 14401 days ago · 5 km deep · 35 km away
  16. 2.78 km NE of San Martin, California · 14401 days ago · 7 km deep · 64 km away
  17. 1.75 km ENE of Hollister, California · 14400 days ago · 7 km deep · 96 km away
  18. 2.71 km ENE of San Ramon, California · 14399 days ago · 8 km deep · 19 km away
  19. 2.11 km NE of San Ramon, California · 14399 days ago · 7 km deep · 19 km away
  20. 1.71 km ENE of San Ramon, California · 14399 days ago · 8 km deep · 19 km away
  21. 3.27 km NNE of East Foothills, California · 14399 days ago · 7 km deep · 22 km away
  22. 1.87 km NNE of East Foothills, California · 14399 days ago · 7 km deep · 22 km away
  23. 1.90 km NW of Walnut Creek, California · 14399 days ago · 6 km deep · 35 km away
  24. 2.27 km NNE of East Foothills, California · 14398 days ago · 7 km deep · 22 km away
  25. 1.84 km W of Moskowite Corner, California · 14398 days ago · 7 km deep · 95 km away
  26. 1.57 km ESE of East Foothills, California · 14398 days ago · 1 km deep · 33 km away
  27. 2.51 km ENE of San Ramon, California · 14397 days ago · 8 km deep · 19 km away
  28. 1.81 km ENE of San Ramon, California · 14397 days ago · 7 km deep · 19 km away
  29. 3.113 km ESE of Alum Rock, California · 14397 days ago · 7 km deep · 39 km away
  30. 1.77 km E of East Foothills, California · 14395 days ago · 8 km deep · 32 km away
  31. 2.3Central California · 14394 days ago · 4 km deep · 95 km away
  32. 2.00 km E of Walnut Creek, California · 14394 days ago · 3 km deep · 34 km away
  33. 2.21 km E of Walnut Creek, California · 14393 days ago · 5 km deep · 34 km away
  34. 1.81 km SE of Waldon, California · 14393 days ago · 5 km deep · 35 km away
  35. 1.80 km E of Walnut Creek, California · 14393 days ago · 4 km deep · 34 km away
  36. 2.61 km E of Walnut Creek, California · 14392 days ago · 5 km deep · 34 km away
  37. 2.216 km SSE of Livermore, California · 14392 days ago · 8 km deep · 23 km away
  38. 2.314 km E of Seven Trees, California · 14391 days ago · 3 km deep · 42 km away
  39. 1.90 km NNE of Acalanes Ridge, California · 14391 days ago · 7 km deep · 35 km away
  40. 1.616 km SSE of Livermore, California · 14391 days ago · 3 km deep · 22 km away
  41. 1.94 km S of San Juan Bautista, California · 14390 days ago · 7 km deep · 97 km away
  42. 1.714 km E of Seven Trees, California · 14390 days ago · 3 km deep · 42 km away
  43. 2.05 km SE of Pleasanton, California · 14389 days ago · 6 km deep · 8 km away
  44. 1.75 km SE of Pleasanton, California · 14389 days ago · 6 km deep · 8 km away
  45. 1.53 km SSW of Alamo, California · 14388 days ago · 12 km deep · 26 km away
  46. 2.010 km WNW of Bolinas, California · 14388 days ago · 6 km deep · 86 km away
  47. 1.714 km E of Seven Trees, California · 14388 days ago · 2 km deep · 42 km away
  48. 1.815 km SSE of Livermore, California · 14387 days ago · 4 km deep · 21 km away
  49. 1.65 km SW of Gilroy, California · 14387 days ago · 3 km deep · 77 km away
  50. 2.30 km E of Walnut Creek, California · 14387 days ago · 5 km deep · 34 km away
  51. 2.34 km SSE of San Juan Bautista, California · 14387 days ago · 7 km deep · 97 km away
  52. 1.613 km N of Morgan Hill, California · 14384 days ago · 3 km deep · 48 km away
  53. 1.7Northern California · 14383 days ago · 7 km deep · 65 km away
  54. 1.90 km W of Walnut Creek, California · 14382 days ago · 5 km deep · 35 km away
  55. 1.89 km ESE of East Foothills, California · 14382 days ago · 1 km deep · 35 km away
  56. 1.614 km ESE of East Foothills, California · 14382 days ago · 1 km deep · 38 km away
  57. 2.19 km ESE of Gilroy, California · 14381 days ago · 5 km deep · 81 km away
  58. 4.04 km ESE of Piedmont, California · 14379 days ago · 4 km deep · 32 km away
  59. 1.92 km NNW of Concord, California · 14379 days ago · 15 km deep · 43 km away
  60. 2.73 km ESE of Piedmont, California · 14379 days ago · 4 km deep · 33 km away

The first 60 of 112.

Before

  1. 2.07 km E of East Foothills, California · 14412 days ago · 6 km deep · 32 km away
  2. 1.512 km NE of East Foothills, California · 14413 days ago · 6 km deep · 24 km away
  3. 1.612 km ENE of East Foothills, California · 14414 days ago · 8 km deep · 29 km away
  4. 2.014 km N of Morgan Hill, California · 14415 days ago · 5 km deep · 46 km away
  5. 2.81 km NNW of Castro Valley, California · 14416 days ago · 5 km deep · 19 km away
  6. 2.07 km SW of Mountain House, California · 14417 days ago · 15 km deep · 30 km away
  7. 1.66 km ENE of Hollister, California · 14417 days ago · 9 km deep · 97 km away
  8. 1.912 km ESE of East Foothills, California · 14417 days ago · 1 km deep · 36 km away
  9. 1.718 km NE of East Foothills, California · 14418 days ago · 5 km deep · 23 km away
  10. 1.618 km NE of East Foothills, California · 14418 days ago · 6 km deep · 23 km away
  11. 1.920 km NE of East Foothills, California · 14418 days ago · 0 km deep · 25 km away
  12. 2.120 km NE of East Foothills, California · 14419 days ago · 1 km deep · 25 km away
  13. 1.712 km NE of East Foothills, California · 14419 days ago · 8 km deep · 24 km away
  14. 1.820 km NE of East Foothills, California · 14419 days ago · 0 km deep · 25 km away
  15. 1.94 km ESE of Interlaken, California · 14420 days ago · 10 km deep · 78 km away
  16. 1.514 km E of Seven Trees, California · 14422 days ago · 1 km deep · 42 km away
  17. 2.020 km NE of East Foothills, California · 14422 days ago · 1 km deep · 25 km away
  18. 1.5Northern California · 14422 days ago · 13 km deep · 22 km away
  19. 2.918 km SSE of Livermore, California · 14423 days ago · 2 km deep · 24 km away
  20. 1.815 km SSE of Livermore, California · 14424 days ago · 4 km deep · 21 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc98210. Read Tue, Sep 22, 2026, 12:32 PM UTC.