California earthquakes

M2.1 earthquake 20 km SSW of Three Rocks, California

A magnitude 2.1 earthquake struck 20 km SSW of Three Rocks, California on Fri, Aug 21, 1987, 3:58 PM PDT (22:58 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.8 22 km NE of San Ardo, California. This one was a foreshock.

Coalinga 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
2.1 (md), micro
Local time
UTC
1987-08-21 22:58:34 UTC
Depth
9.1 km (5.6 mi), shallow
Epicenter
36.320° N, 120.441° 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, 0.4 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
113°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 111 in the 60 days after this one and 62 in the 30 days before it.

After

  1. 1.57 km NNE of Avenal, California · 14285 days ago · 8 km deep · 43 km away
  2. 1.824 km NE of Greenfield, California · 14283 days ago · 6 km deep · 57 km away
  3. 2.022 km NNE of Soledad, California · 14283 days ago · 8 km deep · 76 km away
  4. 2.62 km NW of Avenal, California · 14282 days ago · 15 km deep · 42 km away
  5. 1.81 km WNW of Avenal, California · 14281 days ago · 13 km deep · 43 km away
  6. 2.023 km NE of San Lucas, California · 14280 days ago · 7 km deep · 36 km away
  7. 2.810 km N of Coalinga, California · 14280 days ago · 10 km deep · 11 km away
  8. 2.38 km S of Huron, California · 14280 days ago · 6 km deep · 36 km away
  9. 1.62 km SW of Ridgemark, California · 14280 days ago · 8 km deep · 100 km away
  10. 1.912 km S of Tres Pinos, California · 14280 days ago · 3 km deep · 86 km away
  11. 2.38 km W of Huron, California · 14280 days ago · 15 km deep · 26 km away
  12. 2.09 km SE of Avenal, California · 14279 days ago · -1 km deep · 54 km away
  13. 2.312 km NW of Parkfield, California · 14278 days ago · 10 km deep · 39 km away
  14. 1.512 km SW of Huron, California · 14277 days ago · 13 km deep · 31 km away
  15. 1.7Central California · 14277 days ago · 11 km deep · 9 km away
  16. 2.9Central California · 14277 days ago · 6 km deep · 33 km away
  17. 2.311 km SSW of Three Rocks, California · 14277 days ago · 10 km deep · 10 km away
  18. 1.92 km S of Oak Shores, California · 14275 days ago · 8 km deep · 80 km away
  19. 2.032 km WNW of Three Rocks, California · 14275 days ago · 7 km deep · 41 km away
  20. 1.81 km NW of Three Rocks, California · 14274 days ago · 5 km deep · 22 km away
  21. 2.218 km SSE of Tres Pinos, California · 14273 days ago · 6 km deep · 80 km away
  22. 1.823 km NNE of San Lucas, California · 14273 days ago · 6 km deep · 40 km away
  23. 2.017 km SSE of Tres Pinos, California · 14271 days ago · 4 km deep · 81 km away
  24. 2.51 km ENE of Tres Pinos, California · 14267 days ago · 9 km deep · 94 km away
  25. 1.823 km NW of Parkfield, California · 14267 days ago · 6 km deep · 33 km away
  26. 1.823 km SE of Tres Pinos, California · 14266 days ago · 7 km deep · 73 km away
  27. 2.116 km SE of Tres Pinos, California · 14266 days ago · 7 km deep · 78 km away
  28. 1.524 km NE of Greenfield, California · 14266 days ago · 5 km deep · 58 km away
  29. 2.27 km NE of Ridgemark, California · 14265 days ago · 4 km deep · 98 km away
  30. 1.515 km NNE of Coalinga, California · 14264 days ago · 9 km deep · 14 km away
  31. 1.818 km SSE of Tres Pinos, California · 14264 days ago · 6 km deep · 80 km away
  32. 2.26 km SSW of Ridgemark, California · 14264 days ago · 9 km deep · 98 km away
  33. 1.78 km ESE of Coalinga, California · 14264 days ago · 9 km deep · 27 km away
  34. 2.024km SSE of Kettleman City, CA · 14264 days ago · 5 km deep · 77 km away
  35. 1.77 km NE of Ridgemark, California · 14264 days ago · 4 km deep · 98 km away
  36. 1.817 km SSE of Tres Pinos, California · 14263 days ago · 5 km deep · 81 km away
  37. 1.917 km NW of Parkfield, California · 14262 days ago · 5 km deep · 36 km away
  38. 2.921 km NE of Soledad, California · 14261 days ago · 2 km deep · 72 km away
  39. 2.215 km WNW of Oak Shores, California · 14261 days ago · 5 km deep · 85 km away
  40. 3.412 km NNW of Kettleman City, California · 14261 days ago · 24 km deep · 46 km away
  41. 2.08 km SW of Stratford, California · 14261 days ago · 25 km deep · 55 km away
  42. 1.513 km NNE of Coalinga, California · 14260 days ago · 9 km deep · 13 km away
  43. 3.316 km NNW of Coalinga, California · 14260 days ago · 9 km deep · 5 km away
  44. 1.615 km SE of Tres Pinos, California · 14259 days ago · 10 km deep · 79 km away
  45. 1.715 km NNW of Coalinga, California · 14259 days ago · 9 km deep · 6 km away
  46. 1.55 km NE of Tres Pinos, California · 14259 days ago · 8 km deep · 93 km away
  47. 1.521 km SSW of Los Banos, California · 14258 days ago · 3 km deep · 77 km away
  48. 1.621 km SSW of Los Banos, California · 14258 days ago · 3 km deep · 77 km away
  49. 2.522 km SSW of Los Banos, California · 14258 days ago · 0 km deep · 78 km away
  50. 3.113 km N of Coalinga, California · 14257 days ago · 9 km deep · 10 km away
  51. 1.64 km NW of Parkfield, California · 14257 days ago · 5 km deep · 44 km away
  52. 1.94 km NW of Parkfield, California · 14257 days ago · 5 km deep · 44 km away
  53. 1.94 km NW of Parkfield, California · 14257 days ago · 5 km deep · 44 km away
  54. 2.24 km NW of Parkfield, California · 14257 days ago · 5 km deep · 44 km away
  55. 1.620 km SSE of Tres Pinos, California · 14256 days ago · 4 km deep · 77 km away
  56. 1.627 km SE of Tres Pinos, California · 14255 days ago · 8 km deep · 68 km away
  57. 1.613 km SSE of Tres Pinos, California · 14255 days ago · 3 km deep · 85 km away
  58. 2.08 km ENE of Coalinga, California · 14255 days ago · 10 km deep · 22 km away
  59. 1.77 km S of Tres Pinos, California · 14254 days ago · 7 km deep · 90 km away
  60. 1.66 km ENE of Coalinga, California · 14254 days ago · 13 km deep · 22 km away

The first 60 of 111.

Before

  1. 1.712 km E of Coalinga, California · 14286 days ago · 11 km deep · 29 km away
  2. 2.021 km NE of Soledad, California · 14286 days ago · 2 km deep · 69 km away
  3. 2.06 km ENE of Coalinga, California · 14286 days ago · 7 km deep · 22 km away
  4. 1.623 km NE of Soledad, California · 14288 days ago · 4 km deep · 67 km away
  5. 1.68 km NNW of Huron, California · 14288 days ago · 5 km deep · 29 km away
  6. 1.824 km NE of Greenfield, California · 14288 days ago · 1 km deep · 56 km away
  7. 2.122 km NE of San Lucas, California · 14289 days ago · 9 km deep · 36 km away
  8. 2.923 km NE of Soledad, California · 14289 days ago · 5 km deep · 68 km away
  9. 1.65 km SSW of Huron, California · 14289 days ago · 5 km deep · 35 km away
  10. 1.917 km WSW of Soledad, California · 14290 days ago · 9 km deep · 95 km away
  11. 2.021 km NE of Soledad, California · 14290 days ago · 5 km deep · 71 km away
  12. 2.221 km NE of Soledad, California · 14290 days ago · 5 km deep · 71 km away
  13. 1.630 km ESE of Shandon, California · 14290 days ago · 10 km deep · 94 km away
  14. 2.125 km NE of Greenfield, California · 14290 days ago · 9 km deep · 53 km away
  15. 1.95 km SE of Tres Pinos, California · 14291 days ago · 8 km deep · 89 km away
  16. 1.611 km SW of Huron, California · 14291 days ago · 11 km deep · 30 km away
  17. 2.230 km ESE of Shandon, California · 14291 days ago · 8 km deep · 94 km away
  18. 2.030 km ESE of Shandon, California · 14291 days ago · 8 km deep · 94 km away
  19. 2.730 km ESE of Shandon, California · 14291 days ago · 7 km deep · 94 km away
  20. 2.130 km ESE of Shandon, California · 14291 days ago · 10 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc104884. Read Wed, Sep 30, 2026, 5:37 PM UTC.