California earthquakes

M2.2 earthquake 6 km SSW of Ridgemark, California

A magnitude 2.2 earthquake struck 6 km SSW of Ridgemark, California on Fri, Sep 11, 1987, 9:09 AM PDT (16:09 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.

Ridgemark 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
2.2 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-09-11 16:09:53 UTC
Depth
9.2 km (5.7 mi), shallow
Epicenter
36.761° 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 5.0 km horizontally, 4.1 km in depth
Depth from
From location
Station coverage gap
236°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 59 in the 30 days before it.

After

  1. 1.77 km NE of Ridgemark, California · 14265 days ago · 4 km deep · 13 km away
  2. 3.316 km E of Seven Trees, California · 14265 days ago · 6 km deep · 63 km away
  3. 1.817 km SSE of Tres Pinos, California · 14265 days ago · 5 km deep · 18 km away
  4. 2.312 km N of Morgan Hill, California · 14264 days ago · 3 km deep · 58 km away
  5. 2.921 km NE of Soledad, California · 14263 days ago · 2 km deep · 28 km away
  6. 2.59 km E of Gilroy, California · 14263 days ago · 10 km deep · 27 km away
  7. 2.315 km SSE of Livermore, California · 14262 days ago · 3 km deep · 92 km away
  8. 1.615 km SE of Tres Pinos, California · 14261 days ago · 10 km deep · 20 km away
  9. 1.55 km NE of Tres Pinos, California · 14260 days ago · 8 km deep · 13 km away
  10. 1.521 km SSW of Los Banos, California · 14260 days ago · 3 km deep · 41 km away
  11. 1.621 km SSW of Los Banos, California · 14260 days ago · 3 km deep · 41 km away
  12. 2.522 km SSW of Los Banos, California · 14260 days ago · 0 km deep · 39 km away
  13. 1.620 km SSE of Tres Pinos, California · 14258 days ago · 4 km deep · 22 km away
  14. 1.53 km WNW of San Juan Bautista, California · 14258 days ago · 4 km deep · 20 km away
  15. 1.627 km SE of Tres Pinos, California · 14257 days ago · 8 km deep · 30 km away
  16. 1.613 km SSE of Tres Pinos, California · 14257 days ago · 3 km deep · 14 km away
  17. 2.56 km ENE of Hollister, California · 14257 days ago · 8 km deep · 14 km away
  18. 2.27 km N of East Foothills, California · 14256 days ago · 7 km deep · 85 km away
  19. 1.77 km S of Tres Pinos, California · 14256 days ago · 7 km deep · 8 km away
  20. 1.88 km ENE of Morgan Hill, California · 14256 days ago · 2 km deep · 46 km away
  21. 1.919 km NE of East Foothills, California · 14256 days ago · 6 km deep · 88 km away
  22. 2.222 km NNE of Soledad, California · 14253 days ago · 9 km deep · 23 km away
  23. 1.923 km NE of San Lucas, California · 14253 days ago · 7 km deep · 77 km away
  24. 3.02 km SSW of Lexington Hills, California · 14251 days ago · 16 km deep · 68 km away
  25. 1.622 km NNE of Soledad, California · 14250 days ago · 6 km deep · 25 km away
  26. 2.08 km S of Davenport, California · 14249 days ago · 6 km deep · 74 km away
  27. 2.06 km ENE of Hollister, California · 14249 days ago · 7 km deep · 14 km away
  28. 2.018 km NE of East Foothills, California · 14248 days ago · 6 km deep · 87 km away
  29. 2.612 km NE of East Foothills, California · 14247 days ago · 7 km deep · 85 km away
  30. 1.712 km NE of East Foothills, California · 14247 days ago · 7 km deep · 85 km away
  31. 4.822 km NE of San Ardo, California · 14246 days ago · 27 km deep · 90 km away
  32. 1.86 km ENE of Hollister, California · 14245 days ago · 6 km deep · 13 km away
  33. 1.66 km SE of Tres Pinos, California · 14245 days ago · 5 km deep · 11 km away
  34. 1.823 km NE of King City, California · 14245 days ago · 7 km deep · 63 km away
  35. 1.8Northern California · 14245 days ago · 12 km deep · 41 km away
  36. 2.423 km NE of Greenfield, California · 14245 days ago · 7 km deep · 45 km away
  37. 2.621 km NE of Soledad, California · 14244 days ago · 7 km deep · 30 km away
  38. 1.715 km SE of Livermore, California · 14244 days ago · 4 km deep · 93 km away
  39. 1.613 km N of Morgan Hill, California · 14243 days ago · 5 km deep · 59 km away
  40. 2.022 km NE of Soledad, California · 14242 days ago · 4 km deep · 26 km away
  41. 1.812 km ESE of East Foothills, California · 14241 days ago · 8 km deep · 68 km away
  42. 1.616 km E of Seven Trees, California · 14241 days ago · 6 km deep · 63 km away
  43. 1.613 km ENE of East Foothills, California · 14240 days ago · 7 km deep · 80 km away
  44. 2.213 km ENE of East Foothills, California · 14240 days ago · 5 km deep · 79 km away
  45. 2.311 km SSE of Tres Pinos, California · 14239 days ago · 16 km deep · 12 km away
  46. 1.511 km SSE of Livermore, California · 14239 days ago · 4 km deep · 96 km away
  47. 2.217 km NE of East Foothills, California · 14239 days ago · 7 km deep · 87 km away
  48. 2.416 km SSE of Livermore, California · 14239 days ago · 4 km deep · 91 km away
  49. 1.621 km NE of Soledad, California · 14238 days ago · 6 km deep · 29 km away
  50. 1.513 km WNW of Diablo Grande, California · 14238 days ago · 6 km deep · 75 km away
  51. 1.725 km NE of King City, California · 14237 days ago · 1 km deep · 56 km away
  52. 2.713 km ENE of East Foothills, California · 14237 days ago · 5 km deep · 79 km away
  53. 1.75 km NNE of Tres Pinos, California · 14237 days ago · 4 km deep · 12 km away
  54. 1.519 km SSE of Livermore, California · 14236 days ago · 6 km deep · 88 km away
  55. 2.719 km SSE of Tres Pinos, California · 14235 days ago · 10 km deep · 20 km away
  56. 2.813 km N of Morgan Hill, California · 14234 days ago · 4 km deep · 58 km away
  57. 1.624 km ENE of Soledad, California · 14234 days ago · 3 km deep · 42 km away
  58. 2.112 km NE of East Foothills, California · 14233 days ago · 7 km deep · 85 km away
  59. 2.03 km WSW of San Juan Bautista, California · 14232 days ago · 8 km deep · 18 km away
  60. 1.624 km WSW of Lockwood, California · 14231 days ago · 10 km deep · 97 km away

The first 60 of 125.

Before

  1. 1.818 km SSE of Tres Pinos, California · 14266 days ago · 6 km deep · 19 km away
  2. 2.27 km NE of Ridgemark, California · 14267 days ago · 4 km deep · 13 km away
  3. 2.12 km W of Cambrian Park, California · 14267 days ago · 8 km deep · 75 km away
  4. 1.524 km NE of Greenfield, California · 14268 days ago · 5 km deep · 43 km away
  5. 2.116 km SE of Tres Pinos, California · 14268 days ago · 7 km deep · 21 km away
  6. 1.823 km SE of Tres Pinos, California · 14268 days ago · 7 km deep · 26 km away
  7. 2.51 km ENE of Tres Pinos, California · 14269 days ago · 9 km deep · 8 km away
  8. 1.63 km SSW of Hollister, California · 14270 days ago · 6 km deep · 8 km away
  9. 2.017 km SSE of Tres Pinos, California · 14273 days ago · 4 km deep · 18 km away
  10. 1.517 km NE of East Foothills, California · 14273 days ago · 7 km deep · 87 km away
  11. 2.78 km ESE of East Foothills, California · 14273 days ago · 8 km deep · 73 km away
  12. 1.815 km E of Seven Trees, California · 14273 days ago · 3 km deep · 64 km away
  13. 2.618 km NE of East Foothills, California · 14275 days ago · 5 km deep · 86 km away
  14. 1.823 km NNE of San Lucas, California · 14275 days ago · 6 km deep · 67 km away
  15. 2.218 km SSE of Tres Pinos, California · 14275 days ago · 6 km deep · 19 km away
  16. 1.67 km NE of Hollister, California · 14276 days ago · 6 km deep · 17 km away
  17. 1.81 km NW of Three Rocks, California · 14276 days ago · 5 km deep · 92 km away
  18. 2.032 km WNW of Three Rocks, California · 14277 days ago · 7 km deep · 62 km away
  19. 2.117 km NE of East Foothills, California · 14277 days ago · 7 km deep · 87 km away
  20. 1.513 km ESE of Alum Rock, California · 14277 days ago · 2 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc105672. Read Fri, Oct 2, 2026, 2:07 PM UTC.