California earthquakes

M2.5 earthquake 7 km NE of Ridgemark, California

A magnitude 2.5 earthquake struck 7 km NE of Ridgemark, California on Mon, Aug 21, 1989, 10:36 AM PDT (17:36 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M6.9 The 1989 Loma Prieta, California Earthquake. 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
2.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1989-08-21 17:36:19 UTC
Depth
5.8 km (3.6 mi), shallow
Epicenter
36.867° N, 121.318° 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
±0.11
Depth from
From location
Station coverage gap
61°
Stations used
69

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 175 in the 60 days after this one and 86 in the 30 days before it.

After

  1. 2.68 km ESE of East Foothills, California · 13556 days ago · 6 km deep · 65 km away
  2. 2.227 km NE of Soledad, California · 13556 days ago · 6 km deep · 35 km away
  3. 1.53 km ESE of Big Sur, CA · 13555 days ago · 17 km deep · 79 km away
  4. 1.66 km SSE of San Juan Bautista, California · 13554 days ago · 6 km deep · 19 km away
  5. 1.624 km ENE of Soledad, California · 13554 days ago · 7 km deep · 42 km away
  6. 1.821 km NE of Soledad, California · 13553 days ago · 5 km deep · 40 km away
  7. 1.99 km NNE of East Foothills, California · 13553 days ago · 6 km deep · 77 km away
  8. 3.322 km NNE of Soledad, California · 13553 days ago · 7 km deep · 33 km away
  9. 1.621 km NE of Soledad, California · 13553 days ago · 6 km deep · 34 km away
  10. 2.521 km NE of Soledad, California · 13552 days ago · 6 km deep · 34 km away
  11. 2.421 km NE of Soledad, California · 13552 days ago · 6 km deep · 33 km away
  12. 1.721 km NNE of Soledad, California · 13552 days ago · 6 km deep · 33 km away
  13. 2.621 km NE of Soledad, California · 13552 days ago · 9 km deep · 39 km away
  14. 1.921 km NE of Soledad, California · 13552 days ago · 8 km deep · 39 km away
  15. 2.415 km ESE of Tres Pinos, California · 13551 days ago · 9 km deep · 22 km away
  16. 1.621 km NE of Soledad, California · 13551 days ago · 7 km deep · 38 km away
  17. 2.218 km SSE of Livermore, California · 13551 days ago · 6 km deep · 81 km away
  18. 1.826 km NE of San Ardo, California · 13550 days ago · 5 km deep · 92 km away
  19. 2.07 km E of East Foothills, California · 13550 days ago · 7 km deep · 68 km away
  20. 1.64 km ESE of Tres Pinos, California · 13549 days ago · 7 km deep · 11 km away
  21. 2.324 km NE of Greenfield, California · 13548 days ago · 7 km deep · 51 km away
  22. 1.98 km SE of Livermore, California · 13548 days ago · 5 km deep · 91 km away
  23. 2.28 km SE of Livermore, California · 13548 days ago · 5 km deep · 91 km away
  24. 2.08 km SE of Livermore, California · 13548 days ago · 6 km deep · 91 km away
  25. 2.424 km NE of Greenfield, California · 13548 days ago · 7 km deep · 51 km away
  26. 2.214 km N of Morgan Hill, California · 13548 days ago · 3 km deep · 53 km away
  27. 3.110 km NE of Milpitas, California · 13547 days ago · 7 km deep · 81 km away
  28. 1.510 km NE of Milpitas, California · 13547 days ago · 6 km deep · 81 km away
  29. 2.09 km ESE of East Foothills, California · 13547 days ago · 7 km deep · 65 km away
  30. 1.827 km SE of Big Sur, California · 13546 days ago · 14 km deep · 91 km away
  31. 2.023 km NE of King City, California · 13545 days ago · 5 km deep · 66 km away
  32. 2.021 km NE of Soledad, California · 13545 days ago · 3 km deep · 37 km away
  33. 3.01 km ENE of Aromas, California · 13544 days ago · 7 km deep · 28 km away
  34. 1.610 km NNE of East Foothills, California · 13544 days ago · 6 km deep · 78 km away
  35. 1.822 km ENE of Soledad, California · 13544 days ago · 4 km deep · 43 km away
  36. 1.73 km ESE of Lexington Hills, California · 13542 days ago · 13 km deep · 64 km away
  37. 1.98 km SE of Livermore, California · 13542 days ago · 6 km deep · 91 km away
  38. 2.29 km NNE of East Foothills, California · 13541 days ago · 8 km deep · 77 km away
  39. 2.37 km E of East Foothills, California · 13541 days ago · 6 km deep · 67 km away
  40. 2.67 km E of East Foothills, California · 13541 days ago · 6 km deep · 67 km away
  41. 2.26 km NNE of East Foothills, California · 13541 days ago · 10 km deep · 75 km away
  42. 2.817 km SE of Livermore, California · 13541 days ago · 4 km deep · 82 km away
  43. 1.513 km SSE of Davenport, California · 13541 days ago · 10 km deep · 74 km away
  44. 1.610 km ESE of Gilroy, California · 13540 days ago · 4 km deep · 18 km away
  45. 2.111 km SSE of Tres Pinos, California · 13540 days ago · 4 km deep · 20 km away
  46. 2.326 km ENE of Greenfield, California · 13539 days ago · 8 km deep · 55 km away
  47. 2.23 km E of Lexington Hills, California · 13539 days ago · 14 km deep · 64 km away
  48. 1.58 km SE of Livermore, California · 13539 days ago · 6 km deep · 92 km away
  49. 2.18 km SE of Livermore, California · 13539 days ago · 6 km deep · 92 km away
  50. 1.58 km SE of Livermore, California · 13539 days ago · 6 km deep · 92 km away
  51. 1.94 km E of San Juan Bautista, California · 13538 days ago · 9 km deep · 16 km away
  52. 1.710 km NNE of East Foothills, California · 13537 days ago · 8 km deep · 79 km away
  53. 1.812 km WSW of Saratoga, California · 13537 days ago · 9 km deep · 86 km away
  54. 2.27 km E of East Foothills, California · 13536 days ago · 8 km deep · 68 km away
  55. 3.43 km ESE of Lexington Hills, California · 13536 days ago · 14 km deep · 64 km away
  56. 1.67 km NNE of East Foothills, California · 13535 days ago · 4 km deep · 77 km away
  57. 2.021 km SSE of Tres Pinos, California · 13535 days ago · 5 km deep · 29 km away
  58. 1.67 km E of East Foothills, California · 13534 days ago · 8 km deep · 67 km away
  59. 1.73 km S of San Juan Bautista, California · 13534 days ago · 6 km deep · 20 km away
  60. 2.47 km NE of Ridgemark, California · 13534 days ago · 6 km deep · 0 km away

The first 60 of 175.

Before

  1. 1.9Central California · 13557 days ago · 6 km deep · 22 km away
  2. 2.17 km NE of Hollister, California · 13557 days ago · 6 km deep · 5 km away
  3. 2.411 km S of Tres Pinos, California · 13557 days ago · 5 km deep · 20 km away
  4. 1.723 km ENE of Soledad, California · 13558 days ago · 4 km deep · 46 km away
  5. 1.92 km WNW of Cambrian Park, California · 13558 days ago · 4 km deep · 72 km away
  6. 2.65 km SW of Gilroy, California · 13559 days ago · 6 km deep · 28 km away
  7. 2.34 km SW of Three Rocks, California · 13559 days ago · 8 km deep · 90 km away
  8. 2.421 km NNE of Soledad, California · 13560 days ago · 7 km deep · 32 km away
  9. 1.71 km ENE of Aromas, California · 13561 days ago · 5 km deep · 27 km away
  10. 1.87 km ENE of Gilroy, California · 13561 days ago · 6 km deep · 24 km away
  11. 1.924 km NE of Greenfield, California · 13561 days ago · 5 km deep · 52 km away
  12. 1.67 km SE of Big Sur, California · 13562 days ago · 16 km deep · 80 km away
  13. 2.121 km NE of Soledad, California · 13562 days ago · 4 km deep · 34 km away
  14. 1.77 km NE of Hollister, California · 13562 days ago · 7 km deep · 5 km away
  15. 1.67 km SE of Big Sur, California · 13563 days ago · 16 km deep · 80 km away
  16. 1.728 km SE of Big Sur, California · 13563 days ago · 11 km deep · 90 km away
  17. 1.913 km N of Morgan Hill, California · 13563 days ago · 4 km deep · 51 km away
  18. 1.527 km ENE of Soledad, California · 13564 days ago · 7 km deep · 41 km away
  19. 2.414 km SE of Livermore, California · 13565 days ago · 4 km deep · 85 km away
  20. 2.328 km SE of Big Sur, California · 13566 days ago · 12 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc142767. Read Sat, Oct 3, 2026, 2:56 AM UTC.