California earthquakes

M1.8 earthquake Central California

A magnitude 1.8 earthquake struck in Central California on Thu, Apr 30, 1987, 1:21 AM PDT (08:21 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.1 5 km NNE of Tres Pinos, 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
1.8 (md), micro
Local time
UTC
1987-04-30 08:21:26 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
36.808° N, 121.392° 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
±0.21
Depth from
From location
Station coverage gap
30°
Stations used
53

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 121 in the 60 days after this one and 79 in the 30 days before it.

After

  1. 4.15 km NNE of Tres Pinos, California · 14397 days ago · 8 km deep · 9 km away
  2. 1.94 km NE of Tres Pinos, California · 14397 days ago · 7 km deep · 9 km away
  3. 3.15 km NNE of Tres Pinos, California · 14396 days ago · 8 km deep · 9 km away
  4. 1.714 km E of Seven Trees, California · 14396 days ago · 3 km deep · 60 km away
  5. 2.05 km SE of Pleasanton, California · 14396 days ago · 6 km deep · 100 km away
  6. 1.75 km SE of Pleasanton, California · 14396 days ago · 6 km deep · 100 km away
  7. 1.714 km E of Seven Trees, California · 14395 days ago · 2 km deep · 60 km away
  8. 1.618 km SSE of Tres Pinos, California · 14395 days ago · 6 km deep · 23 km away
  9. 1.94 km NE of Tres Pinos, California · 14395 days ago · 8 km deep · 9 km away
  10. 2.05 km NNE of Tres Pinos, California · 14395 days ago · 8 km deep · 9 km away
  11. 1.815 km SSE of Livermore, California · 14394 days ago · 4 km deep · 87 km away
  12. 1.65 km SW of Gilroy, California · 14394 days ago · 3 km deep · 26 km away
  13. 2.34 km SSE of San Juan Bautista, California · 14394 days ago · 7 km deep · 12 km away
  14. 1.823 km ENE of Soledad, California · 14394 days ago · 6 km deep · 45 km away
  15. 1.622 km SSE of Tres Pinos, California · 14393 days ago · 4 km deep · 28 km away
  16. 1.623 km ENE of Soledad, California · 14393 days ago · 4 km deep · 44 km away
  17. 1.923 km ENE of Soledad, California · 14392 days ago · 4 km deep · 44 km away
  18. 1.613 km N of Morgan Hill, California · 14391 days ago · 3 km deep · 54 km away
  19. 1.618 km SSE of Tres Pinos, California · 14390 days ago · 6 km deep · 23 km away
  20. 1.7Northern California · 14390 days ago · 7 km deep · 37 km away
  21. 2.29 km SE of San Juan Bautista, California · 14390 days ago · 7 km deep · 9 km away
  22. 1.622 km NNE of Soledad, California · 14389 days ago · 6 km deep · 29 km away
  23. 1.89 km ESE of East Foothills, California · 14389 days ago · 1 km deep · 66 km away
  24. 1.614 km ESE of East Foothills, California · 14389 days ago · 1 km deep · 64 km away
  25. 2.19 km ESE of Gilroy, California · 14388 days ago · 5 km deep · 21 km away
  26. 1.521 km NE of Soledad, California · 14387 days ago · 2 km deep · 31 km away
  27. 2.018 km WSW of Mendota, California · 14386 days ago · 1 km deep · 73 km away
  28. 2.421 km NE of Soledad, California · 14386 days ago · 2 km deep · 36 km away
  29. 2.14 km NE of Tres Pinos, California · 14386 days ago · 7 km deep · 9 km away
  30. 1.613 km N of Morgan Hill, California · 14386 days ago · 3 km deep · 53 km away
  31. 1.819 km SSE of Tres Pinos, California · 14385 days ago · 4 km deep · 25 km away
  32. 2.4Northern California · 14385 days ago · 14 km deep · 82 km away
  33. 1.9Central California · 14385 days ago · 1 km deep · 80 km away
  34. 1.713 km N of Hollister, California · 14385 days ago · 6 km deep · 18 km away
  35. 1.617 km SSE of Tres Pinos, California · 14384 days ago · 4 km deep · 22 km away
  36. 2.87 km NNE of East Foothills, California · 14382 days ago · 7 km deep · 79 km away
  37. 1.812 km NE of East Foothills, California · 14382 days ago · 5 km deep · 80 km away
  38. 2.613 km ENE of East Foothills, California · 14382 days ago · 7 km deep · 76 km away
  39. 1.817 km SSE of Tres Pinos, California · 14381 days ago · 4 km deep · 22 km away
  40. 2.08 km WNW of Davenport, California · 14381 days ago · 12 km deep · 83 km away
  41. 2.12 km ESE of San Ardo, California · 14380 days ago · 11 km deep · 99 km away
  42. 2.220 km W of Lockwood, California · 14379 days ago · 2 km deep · 97 km away
  43. 2.315 km SSE of Livermore, California · 14379 days ago · 4 km deep · 88 km away
  44. 2.114 km N of Morgan Hill, California · 14379 days ago · 3 km deep · 56 km away
  45. 1.923 km ENE of Soledad, California · 14379 days ago · 4 km deep · 44 km away
  46. 1.718 km SSE of Tres Pinos, California · 14378 days ago · 10 km deep · 23 km away
  47. 1.814 km N of Morgan Hill, California · 14377 days ago · 6 km deep · 55 km away
  48. 1.518 km SSE of Tres Pinos, California · 14376 days ago · 10 km deep · 23 km away
  49. 1.618 km NE of East Foothills, California · 14376 days ago · 4 km deep · 83 km away
  50. 2.018 km NE of East Foothills, California · 14376 days ago · 4 km deep · 83 km away
  51. 1.816 km E of Seven Trees, California · 14374 days ago · 6 km deep · 58 km away
  52. 2.622 km NE of Soledad, California · 14374 days ago · 4 km deep · 31 km away
  53. 1.61 km NE of Pacific Grove, California · 14373 days ago · 4 km deep · 50 km away
  54. 1.724 km NE of King City, California · 14372 days ago · 6 km deep · 63 km away
  55. 1.514 km E of Seven Trees, California · 14372 days ago · 2 km deep · 60 km away
  56. 1.57 km ENE of Interlaken, California · 14371 days ago · 8 km deep · 30 km away
  57. 1.521 km NE of Soledad, California · 14371 days ago · 6 km deep · 33 km away
  58. 2.05 km SE of Tres Pinos, California · 14370 days ago · 7 km deep · 12 km away
  59. 1.68 km ESE of East Foothills, California · 14370 days ago · 2 km deep · 67 km away
  60. 1.62 km ESE of San Ardo, California · 14370 days ago · 10 km deep · 100 km away

The first 60 of 121.

Before

  1. 1.8Central California · 14397 days ago · 17 km deep · 86 km away
  2. 1.94 km S of San Juan Bautista, California · 14397 days ago · 7 km deep · 12 km away
  3. 2.85 km NNE of Tres Pinos, California · 14398 days ago · 8 km deep · 9 km away
  4. 1.621 km SE of Big Sur, California · 14398 days ago · 10 km deep · 76 km away
  5. 1.616 km SSE of Livermore, California · 14398 days ago · 3 km deep · 87 km away
  6. 2.314 km E of Seven Trees, California · 14398 days ago · 3 km deep · 60 km away
  7. 2.216 km SSE of Livermore, California · 14399 days ago · 8 km deep · 87 km away
  8. 1.63 km NNE of Pacific Grove, California · 14400 days ago · 11 km deep · 49 km away
  9. 2.025 km NE of Soledad, California · 14400 days ago · 9 km deep · 36 km away
  10. 2.3Central California · 14401 days ago · 4 km deep · 13 km away
  11. 2.82 km SW of Ridgemark, California · 14401 days ago · 13 km deep · 1 km away
  12. 1.77 km E of East Foothills, California · 14402 days ago · 8 km deep · 69 km away
  13. 2.123 km NNE of San Lucas, California · 14403 days ago · 5 km deep · 72 km away
  14. 3.113 km ESE of Alum Rock, California · 14404 days ago · 7 km deep · 62 km away
  15. 2.123 km NE of San Ardo, California · 14404 days ago · 7 km deep · 89 km away
  16. 2.221 km NNE of Soledad, California · 14405 days ago · 6 km deep · 30 km away
  17. 1.57 km ESE of East Foothills, California · 14405 days ago · 1 km deep · 69 km away
  18. 1.621 km NE of Soledad, California · 14405 days ago · 2 km deep · 34 km away
  19. 1.921 km NNE of Soledad, California · 14405 days ago · 6 km deep · 30 km away
  20. 2.27 km NNE of East Foothills, California · 14405 days ago · 7 km deep · 79 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc99497. Read Tue, Sep 29, 2026, 9:43 AM UTC.