California earthquakes

M1.6 earthquake 4 km E of Sunol, California

A magnitude 1.6 earthquake struck 4 km E of Sunol, California on Sat, Aug 22, 1987, 10:48 PM PDT (05:48 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.4 12 km N of Livermore, California. This one was a foreshock.

Sunol forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.6 (md), micro
Local time
UTC
1987-08-23 05:48:17 UTC
Depth
7.1 km (4.4 mi), shallow
Epicenter
37.589° N, 121.833° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
69°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 83 in the 60 days after this one and 43 in the 30 days before it.

After

  1. 2.817 km SSE of Livermore, California · 14280 days ago · 1 km deep · 16 km away
  2. 1.79 km SW of Brentwood, California · 14279 days ago · 18 km deep · 31 km away
  3. 3.818 km SW of Gustine, California · 14278 days ago · 0 km deep · 77 km away
  4. 1.62 km SW of Ridgemark, California · 14277 days ago · 8 km deep · 97 km away
  5. 1.518 km SW of Gustine, California · 14277 days ago · 0 km deep · 77 km away
  6. 1.92 km W of Taft Mosswood, California · 14276 days ago · 4 km deep · 59 km away
  7. 3.42 km ESE of East Richmond Heights, California · 14276 days ago · 8 km deep · 56 km away
  8. 2.72 km ESE of East Richmond Heights, California · 14276 days ago · 8 km deep · 55 km away
  9. 2.511 km N of Pittsburg, California · 14275 days ago · 12 km deep · 60 km away
  10. 2.510 km ENE of East Foothills, California · 14275 days ago · 8 km deep · 22 km away
  11. 2.04 km S of San Juan Bautista, California · 14275 days ago · 7 km deep · 91 km away
  12. 1.94 km S of San Juan Bautista, California · 14275 days ago · 7 km deep · 91 km away
  13. 1.512 km ENE of East Foothills, California · 14274 days ago · 8 km deep · 22 km away
  14. 1.513 km N of Morgan Hill, California · 14274 days ago · 5 km deep · 42 km away
  15. 2.53 km E of Berkeley, California · 14274 days ago · 10 km deep · 47 km away
  16. 2.63 km E of Berkeley, California · 14274 days ago · 11 km deep · 47 km away
  17. 1.82 km E of Berkeley, California · 14274 days ago · 10 km deep · 47 km away
  18. 1.93 km E of Berkeley, California · 14274 days ago · 11 km deep · 47 km away
  19. 1.513 km ESE of Alum Rock, California · 14273 days ago · 2 km deep · 33 km away
  20. 2.117 km NE of East Foothills, California · 14273 days ago · 7 km deep · 16 km away
  21. 1.67 km NE of Hollister, California · 14271 days ago · 6 km deep · 87 km away
  22. 1.83 km SE of Piedmont, California · 14271 days ago · 10 km deep · 40 km away
  23. 2.618 km NE of East Foothills, California · 14270 days ago · 5 km deep · 17 km away
  24. 1.815 km E of Seven Trees, California · 14269 days ago · 3 km deep · 36 km away
  25. 2.78 km ESE of East Foothills, California · 14268 days ago · 8 km deep · 27 km away
  26. 1.517 km NE of East Foothills, California · 14268 days ago · 7 km deep · 16 km away
  27. 1.63 km SSW of Hollister, California · 14266 days ago · 6 km deep · 93 km away
  28. 2.51 km ENE of Tres Pinos, California · 14264 days ago · 9 km deep · 100 km away
  29. 2.12 km W of Cambrian Park, California · 14263 days ago · 8 km deep · 38 km away
  30. 2.27 km NE of Ridgemark, California · 14262 days ago · 4 km deep · 93 km away
  31. 1.77 km NE of Ridgemark, California · 14261 days ago · 4 km deep · 94 km away
  32. 3.316 km E of Seven Trees, California · 14260 days ago · 6 km deep · 37 km away
  33. 2.312 km N of Morgan Hill, California · 14260 days ago · 3 km deep · 42 km away
  34. 1.83 km NE of Martinez, California · 14259 days ago · 5 km deep · 55 km away
  35. 2.59 km E of Gilroy, California · 14259 days ago · 10 km deep · 74 km away
  36. 2.315 km SSE of Livermore, California · 14258 days ago · 3 km deep · 13 km away
  37. 2.39 km SE of Sonoma, California · 14257 days ago · 7 km deep · 87 km away
  38. 1.55 km NE of Tres Pinos, California · 14256 days ago · 8 km deep · 98 km away
  39. 2.39 km S of Muir Beach, California · 14254 days ago · 9 km deep · 69 km away
  40. 3.39 km S of Muir Beach, California · 14253 days ago · 10 km deep · 69 km away
  41. 1.53 km WNW of San Juan Bautista, California · 14253 days ago · 4 km deep · 85 km away
  42. 3.03 km E of Berkeley, California · 14253 days ago · 11 km deep · 47 km away
  43. 2.03 km ESE of Berkeley, California · 14253 days ago · 10 km deep · 47 km away
  44. 2.56 km ENE of Hollister, California · 14253 days ago · 8 km deep · 90 km away
  45. 2.27 km N of East Foothills, California · 14252 days ago · 7 km deep · 15 km away
  46. 1.88 km ENE of Morgan Hill, California · 14251 days ago · 2 km deep · 54 km away
  47. 1.919 km NE of East Foothills, California · 14251 days ago · 6 km deep · 15 km away
  48. 3.02 km SSW of Lexington Hills, California · 14247 days ago · 16 km deep · 52 km away
  49. 2.08 km S of Davenport, California · 14245 days ago · 6 km deep · 79 km away
  50. 2.06 km ENE of Hollister, California · 14244 days ago · 7 km deep · 90 km away
  51. 1.510 km ENE of Blackhawk, California · 14244 days ago · 10 km deep · 30 km away
  52. 2.018 km NE of East Foothills, California · 14243 days ago · 6 km deep · 16 km away
  53. 2.612 km NE of East Foothills, California · 14243 days ago · 7 km deep · 15 km away
  54. 1.712 km NE of East Foothills, California · 14243 days ago · 7 km deep · 15 km away
  55. 1.86 km ENE of Hollister, California · 14241 days ago · 6 km deep · 91 km away
  56. 1.8Northern California · 14240 days ago · 12 km deep · 64 km away
  57. 2.02 km N of San Leandro, California · 14240 days ago · 5 km deep · 33 km away
  58. 1.715 km SE of Livermore, California · 14239 days ago · 4 km deep · 15 km away
  59. 1.613 km N of Morgan Hill, California · 14238 days ago · 5 km deep · 41 km away
  60. 1.78 km W of Brentwood, California · 14238 days ago · 19 km deep · 37 km away

The first 60 of 83.

Before

  1. 1.65 km ENE of Hollister, California · 14281 days ago · 5 km deep · 90 km away
  2. 1.917 km NE of East Foothills, California · 14282 days ago · 6 km deep · 16 km away
  3. 1.915 km N of Morgan Hill, California · 14283 days ago · 4 km deep · 39 km away
  4. 1.53 km WSW of Hollister, California · 14283 days ago · 9 km deep · 90 km away
  5. 3.13 km NE of San Leandro, California · 14283 days ago · 8 km deep · 31 km away
  6. 2.118 km NE of East Foothills, California · 14283 days ago · 6 km deep · 16 km away
  7. 2.410 km S of Muir Beach, California · 14286 days ago · 8 km deep · 67 km away
  8. 1.91 km W of Green Valley, California · 14287 days ago · 10 km deep · 80 km away
  9. 2.68 km NE of Interlaken, California · 14289 days ago · 7 km deep · 67 km away
  10. 2.612 km ESE of East Foothills, California · 14290 days ago · 7 km deep · 32 km away
  11. 1.519 km SSE of Livermore, California · 14292 days ago · 5 km deep · 16 km away
  12. 1.610 km NNW of Hollister, California · 14293 days ago · 4 km deep · 80 km away
  13. 1.717 km NE of East Foothills, California · 14293 days ago · 6 km deep · 16 km away
  14. 1.93 km S of San Juan Bautista, California · 14293 days ago · 6 km deep · 90 km away
  15. 2.01 km N of Pittsburg, California · 14294 days ago · 20 km deep · 51 km away
  16. 1.610 km SW of Ridgemark, California · 14294 days ago · 7 km deep · 99 km away
  17. 1.711 km SW of Brentwood, California · 14294 days ago · 20 km deep · 29 km away
  18. 1.63 km SW of Broadmoor, California · 14294 days ago · 8 km deep · 60 km away
  19. 1.63 km ESE of Piedmont, California · 14294 days ago · 3 km deep · 40 km away
  20. 1.918 km SSE of Livermore, California · 14295 days ago · 7 km deep · 15 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc104939. Read Mon, Sep 28, 2026, 4:45 AM UTC.