California earthquakes

M2.7 earthquake 7 km NE of Ridgemark, California

A magnitude 2.7 earthquake struck 7 km NE of Ridgemark, California on Wed, Oct 18, 1989, 10:31 AM PDT (17:31 UTC), 7 km (5 mi) below the surface.

A larger quake followed: M4.7 4 km NW of Day Valley, 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
2.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1989-10-18 17:31:05 UTC
Depth
7.3 km (4.5 mi), shallow
Epicenter
36.853° N, 121.305° 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
±0.13
Depth from
From location
Station coverage gap
175°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

After

  1. 1.65 km WNW of Day Valley, California · 13498 days ago · 17 km deep · 59 km away
  2. 2.17 km NE of Ridgemark, California · 13498 days ago · 7 km deep · 0 km away
  3. 2.67 km NE of Corralitos, California · 13498 days ago · 5 km deep · 45 km away
  4. 2.03 km E of Interlaken, California · 13498 days ago · 9 km deep · 36 km away
  5. 1.85 km NW of Day Valley, California · 13498 days ago · 16 km deep · 59 km away
  6. 1.56 km NE of Amesti, California · 13498 days ago · 8 km deep · 42 km away
  7. 3.85 km E of Interlaken, California · 13498 days ago · 6 km deep · 35 km away
  8. 3.55 km E of Interlaken, California · 13498 days ago · 6 km deep · 34 km away
  9. 1.8Northern California · 13498 days ago · 13 km deep · 69 km away
  10. 1.6Northern California · 13498 days ago · 17 km deep · 73 km away
  11. 2.40 km N of Lexington Hills, California · 13498 days ago · 9 km deep · 69 km away
  12. 1.92 km NNW of Corralitos, California · 13498 days ago · 15 km deep · 49 km away
  13. 1.92 km E of Interlaken, California · 13498 days ago · 0 km deep · 37 km away
  14. 1.76 km E of Day Valley, California · 13498 days ago · 4 km deep · 48 km away
  15. 2.12 km S of Lexington Hills, California · 13498 days ago · 13 km deep · 68 km away
  16. 1.51 km S of Lexington Hills, California · 13498 days ago · 2 km deep · 68 km away
  17. 1.88 km NE of Day Valley, California · 13498 days ago · 7 km deep · 50 km away
  18. 1.52 km SSE of Lexington Hills, California · 13498 days ago · 9 km deep · 66 km away
  19. 1.65 km WNW of San Juan Bautista, California · 13498 days ago · 7 km deep · 26 km away
  20. 1.89 km N of Day Valley, California · 13498 days ago · 4 km deep · 58 km away
  21. 2.21 km NW of Lexington Hills, California · 13498 days ago · 9 km deep · 70 km away
  22. 2.13 km WNW of San Juan Bautista, California · 13498 days ago · 7 km deep · 24 km away
  23. 2.19 km N of Day Valley, California · 13498 days ago · 3 km deep · 59 km away
  24. 1.84 km NNW of Aromas, California · 13498 days ago · 10 km deep · 33 km away
  25. 1.51 km SE of Campbell, California · 13498 days ago · 19 km deep · 73 km away
  26. 2.01 km NW of Lexington Hills, California · 13498 days ago · 7 km deep · 70 km away
  27. 3.27 km SE of Lexington Hills, California · 13498 days ago · 9 km deep · 61 km away
  28. 1.85 km NNW of Aromas, California · 13498 days ago · 10 km deep · 34 km away
  29. 2.06 km NE of Scotts Valley, California · 13498 days ago · 16 km deep · 63 km away
  30. 1.61 km NNW of Lexington Hills, California · 13498 days ago · 7 km deep · 70 km away
  31. 1.91 km NNW of Lexington Hills, California · 13498 days ago · 7 km deep · 70 km away
  32. 1.71 km NE of Interlaken, California · 13498 days ago · 13 km deep · 39 km away
  33. 1.84 km E of Interlaken, California · 13498 days ago · 10 km deep · 35 km away
  34. 1.92 km SSW of Lexington Hills, California · 13498 days ago · 14 km deep · 69 km away
  35. 2.07 km NNE of Corralitos, California · 13498 days ago · 5 km deep · 48 km away
  36. 3.3Northern California · 13498 days ago · 5 km deep · 41 km away
  37. 2.92 km WSW of Lexington Hills, California · 13498 days ago · 12 km deep · 70 km away
  38. 2.62 km NNE of Day Valley, California · 13498 days ago · 12 km deep · 54 km away
  39. 2.47 km ENE of Day Valley, CA · 13498 days ago · 6 km deep · 48 km away
  40. 2.85 km SE of Aromas, California · 13498 days ago · 6 km deep · 26 km away
  41. 2.54 km NNW of Aromas, California · 13498 days ago · 8 km deep · 33 km away
  42. 1.58 km SE of Lexington Hills, California · 13498 days ago · 4 km deep · 61 km away
  43. 1.7Central California · 13498 days ago · 14 km deep · 43 km away
  44. 1.67 km ENE of Scotts Valley, California · 13498 days ago · 16 km deep · 61 km away
  45. 1.6Northern California · 13498 days ago · 16 km deep · 59 km away
  46. 1.7Central California · 13498 days ago · 6 km deep · 33 km away
  47. 1.93 km S of Lexington Hills, California · 13498 days ago · 11 km deep · 66 km away
  48. 1.85 km SSW of Lexington Hills, California · 13498 days ago · 18 km deep · 68 km away
  49. 1.96 km NNE of Corralitos, California · 13498 days ago · 2 km deep · 46 km away
  50. 2.43 km S of Lexington Hills, California · 13498 days ago · 14 km deep · 68 km away
  51. 1.64 km ENE of Day Valley, California · 13498 days ago · 5 km deep · 51 km away
  52. 1.65 km E of Day Valley, California · 13498 days ago · 1 km deep · 49 km away
  53. 1.93 km E of Corralitos, California · 13498 days ago · 14 km deep · 44 km away
  54. 3.18 km SSE of Lexington Hills, California · 13498 days ago · 10 km deep · 62 km away
  55. 3.218 km NNW of Coalinga, California · 13498 days ago · 9 km deep · 100 km away
  56. 2.318 km NNW of Coalinga, California · 13498 days ago · 8 km deep · 100 km away
  57. 1.74 km N of Corralitos, California · 13498 days ago · 13 km deep · 48 km away
  58. 1.81 km N of Corralitos, California · 13498 days ago · 16 km deep · 48 km away
  59. 1.74 km WNW of Lexington Hills, California · 13498 days ago · 10 km deep · 74 km away
  60. 2.75 km N of Corralitos, California · 13498 days ago · 4 km deep · 48 km away

The first 60 of at least 202.

Before

  1. 2.87 km NE of Corralitos, California · 13498 days ago · 5 km deep · 45 km away
  2. 2.47 km NE of Corralitos, California · 13498 days ago · 5 km deep · 45 km away
  3. 1.63 km NNE of Amesti, California · 13498 days ago · 15 km deep · 43 km away
  4. 1.60 km WNW of Lexington Hills, California · 13498 days ago · 10 km deep · 69 km away
  5. 1.93 km N of Day Valley, California · 13498 days ago · 11 km deep · 55 km away
  6. 1.77 km ESE of Lexington Hills, California · 13498 days ago · 9 km deep · 61 km away
  7. 2.91 km SSE of Lexington Hills, California · 13498 days ago · 5 km deep · 68 km away
  8. 2.16 km S of Lexington Hills, California · 13498 days ago · 15 km deep · 66 km away
  9. 2.16 km S of Lexington Hills, California · 13498 days ago · 16 km deep · 66 km away
  10. 2.41 km W of Lexington Hills, California · 13498 days ago · 11 km deep · 70 km away
  11. 2.32 km SSW of Lexington Hills, California · 13498 days ago · 13 km deep · 68 km away
  12. 2.42 km W of Lexington Hills, California · 13498 days ago · 13 km deep · 70 km away
  13. 2.03 km S of Lexington Hills, California · 13498 days ago · 13 km deep · 67 km away
  14. 3.54 km E of Day Valley, California · 13498 days ago · 2 km deep · 49 km away
  15. 2.57 km NE of Day Valley, California · 13498 days ago · 8 km deep · 51 km away
  16. 2.65 km ENE of Zayante, California · 13498 days ago · 20 km deep · 68 km away
  17. 3.16 km NNE of Corralitos, California · 13498 days ago · 5 km deep · 48 km away
  18. 1.59 km N of Day Valley, California · 13498 days ago · 4 km deep · 58 km away
  19. 2.15 km E of Day Valley, California · 13498 days ago · 6 km deep · 49 km away
  20. 2.16 km NNE of Interlaken, California · 13498 days ago · 2 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc20091213. Read Sat, Oct 3, 2026, 1:38 AM UTC.