California earthquakes

M1.6 earthquake 15 km E of Seven Trees, California

A magnitude 1.6 earthquake struck 15 km E of Seven Trees, California on Tue, Jul 28, 1987, 12:04 AM PDT (07:04 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M3.8 18 km SW of Gustine, California. This one was a foreshock.

Seven Trees 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-07-28 07:04:28 UTC
Depth
5.5 km (3.4 mi), shallow
Epicenter
37.290° N, 121.668° 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, 0.3 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
61°
Stations used
38

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 64 in the 30 days before it.

After

  1. 2.86 km E of East Foothills, California · 14312 days ago · 6 km deep · 13 km away
  2. 1.87 km NNE of East Foothills, California · 14312 days ago · 7 km deep · 21 km away
  3. 1.89 km SE of San Juan Bautista, California · 14311 days ago · 7 km deep · 60 km away
  4. 1.812 km S of Tres Pinos, California · 14310 days ago · 6 km deep · 76 km away
  5. 1.5Northern California · 14310 days ago · 6 km deep · 1 km away
  6. 2.015 km E of Seven Trees, California · 14310 days ago · 6 km deep · 0 km away
  7. 1.615 km ESE of East Foothills, California · 14309 days ago · 2 km deep · 5 km away
  8. 1.79 km ENE of Blackhawk, California · 14308 days ago · 13 km deep · 62 km away
  9. 1.69 km E of Blackhawk, California · 14308 days ago · 10 km deep · 62 km away
  10. 1.79 km ENE of Blackhawk, California · 14308 days ago · 11 km deep · 62 km away
  11. 1.616 km E of Seven Trees, California · 14306 days ago · 6 km deep · 2 km away
  12. 1.921 km NE of Soledad, California · 14306 days ago · 6 km deep · 94 km away
  13. 1.77 km SE of Lexington Hills, California · 14306 days ago · 14 km deep · 29 km away
  14. 2.68 km NE of San Martin, California · 14305 days ago · 8 km deep · 22 km away
  15. 1.75 km NNE of Tres Pinos, California · 14305 days ago · 4 km deep · 61 km away
  16. 2.24 km SSE of Portola Valley, California · 14303 days ago · 10 km deep · 49 km away
  17. 1.84 km SSE of Portola Valley, California · 14303 days ago · 10 km deep · 48 km away
  18. 1.53 km ENE of San Leandro, California · 14302 days ago · 6 km deep · 63 km away
  19. 1.918 km SSE of Livermore, California · 14301 days ago · 7 km deep · 26 km away
  20. 1.63 km ESE of Piedmont, California · 14301 days ago · 3 km deep · 74 km away
  21. 1.63 km SW of Broadmoor, California · 14301 days ago · 8 km deep · 85 km away
  22. 1.711 km SW of Brentwood, California · 14301 days ago · 20 km deep · 62 km away
  23. 1.610 km SW of Ridgemark, California · 14301 days ago · 7 km deep · 63 km away
  24. 2.01 km N of Pittsburg, California · 14300 days ago · 20 km deep · 86 km away
  25. 1.93 km S of San Juan Bautista, California · 14300 days ago · 6 km deep · 54 km away
  26. 1.717 km NE of East Foothills, California · 14299 days ago · 6 km deep · 24 km away
  27. 1.610 km NNW of Hollister, California · 14299 days ago · 4 km deep · 44 km away
  28. 2.11 km SSE of Tres Pinos, California · 14299 days ago · 8 km deep · 65 km away
  29. 1.519 km SSE of Livermore, California · 14298 days ago · 5 km deep · 26 km away
  30. 2.60 km WNW of Sand City, California · 14297 days ago · 2 km deep · 76 km away
  31. 1.821 km NE of Soledad, California · 14297 days ago · 6 km deep · 95 km away
  32. 2.612 km ESE of East Foothills, California · 14296 days ago · 7 km deep · 5 km away
  33. 2.68 km NE of Interlaken, California · 14296 days ago · 7 km deep · 32 km away
  34. 1.95 km SE of Tres Pinos, California · 14295 days ago · 8 km deep · 69 km away
  35. 2.221 km NE of Soledad, California · 14294 days ago · 5 km deep · 91 km away
  36. 2.021 km NE of Soledad, California · 14294 days ago · 5 km deep · 91 km away
  37. 2.923 km NE of Soledad, California · 14293 days ago · 5 km deep · 93 km away
  38. 2.410 km S of Muir Beach, California · 14292 days ago · 8 km deep · 95 km away
  39. 1.623 km NE of Soledad, California · 14292 days ago · 4 km deep · 94 km away
  40. 2.118 km NE of East Foothills, California · 14290 days ago · 6 km deep · 24 km away
  41. 2.021 km NE of Soledad, California · 14290 days ago · 2 km deep · 93 km away
  42. 3.13 km NE of San Leandro, California · 14289 days ago · 8 km deep · 65 km away
  43. 1.53 km WSW of Hollister, California · 14289 days ago · 9 km deep · 54 km away
  44. 1.915 km N of Morgan Hill, California · 14289 days ago · 4 km deep · 2 km away
  45. 1.917 km NE of East Foothills, California · 14288 days ago · 6 km deep · 24 km away
  46. 1.65 km ENE of Hollister, California · 14288 days ago · 5 km deep · 54 km away
  47. 1.64 km E of Sunol, California · 14287 days ago · 7 km deep · 36 km away
  48. 2.022 km NNE of Soledad, California · 14287 days ago · 8 km deep · 87 km away
  49. 2.817 km SSE of Livermore, California · 14287 days ago · 1 km deep · 28 km away
  50. 1.79 km SW of Brentwood, California · 14285 days ago · 18 km deep · 64 km away
  51. 3.818 km SW of Gustine, California · 14284 days ago · 0 km deep · 48 km away
  52. 1.62 km SW of Ridgemark, California · 14284 days ago · 8 km deep · 60 km away
  53. 1.912 km S of Tres Pinos, California · 14284 days ago · 3 km deep · 76 km away
  54. 1.518 km SW of Gustine, California · 14283 days ago · 0 km deep · 48 km away
  55. 1.92 km W of Taft Mosswood, California · 14283 days ago · 4 km deep · 76 km away
  56. 3.42 km ESE of East Richmond Heights, California · 14282 days ago · 8 km deep · 90 km away
  57. 2.72 km ESE of East Richmond Heights, California · 14282 days ago · 8 km deep · 90 km away
  58. 2.511 km N of Pittsburg, California · 14282 days ago · 12 km deep · 95 km away
  59. 2.510 km ENE of East Foothills, California · 14282 days ago · 8 km deep · 15 km away
  60. 2.04 km S of San Juan Bautista, California · 14281 days ago · 7 km deep · 55 km away

The first 60 of 113.

Before

  1. 1.518 km NE of East Foothills, California · 14314 days ago · 6 km deep · 24 km away
  2. 1.64 km ESE of Tres Pinos, California · 14316 days ago · 6 km deep · 68 km away
  3. 1.98 km ENE of Milpitas, California · 14316 days ago · 5 km deep · 24 km away
  4. 2.615 km SSE of Livermore, California · 14317 days ago · 2 km deep · 29 km away
  5. 2.518 km NE of East Foothills, California · 14317 days ago · 5 km deep · 25 km away
  6. 2.415 km SSE of Livermore, California · 14317 days ago · 2 km deep · 30 km away
  7. 1.59 km ESE of Seven Trees, California · 14318 days ago · 4 km deep · 9 km away
  8. 1.621 km NE of Soledad, California · 14318 days ago · 3 km deep · 93 km away
  9. 1.715 km SSE of Livermore, California · 14319 days ago · 3 km deep · 30 km away
  10. 2.42 km E of Union City, California · 14321 days ago · 6 km deep · 45 km away
  11. 1.62 km E of Visitacion Valley, California · 14321 days ago · 1 km deep · 79 km away
  12. 2.84 km W of Antioch, California · 14321 days ago · 18 km deep · 81 km away
  13. 2.07 km E of East Foothills, California · 14322 days ago · 7 km deep · 12 km away
  14. 2.121 km NE of Soledad, California · 14322 days ago · 6 km deep · 89 km away
  15. 2.521 km NE of Soledad, California · 14322 days ago · 7 km deep · 89 km away
  16. 1.5Northern California · 14323 days ago · 0 km deep · 43 km away
  17. 1.914 km NE of East Foothills, California · 14323 days ago · 9 km deep · 18 km away
  18. 1.812 km N of Morgan Hill, California · 14323 days ago · 4 km deep · 6 km away
  19. 1.78 km NE of Morgan Hill, California · 14323 days ago · 3 km deep · 15 km away
  20. 1.73 km N of Interlaken, California · 14324 days ago · 13 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc103702. Read Sun, Oct 4, 2026, 4:21 PM UTC.