California earthquakes

M1.8 earthquake 5 km SSW of Ridgemark, California

A magnitude 1.8 earthquake struck 5 km SSW of Ridgemark, California on Fri, Nov 17, 1989, 7:27 PM PST (03:27 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.4 Central 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1989-11-18 03:27:15 UTC
Depth
6.3 km (3.9 mi), shallow
Epicenter
36.764° N, 121.379° 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
±0.17
Depth from
From location
Station coverage gap
50°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 193 in the 60 days after this one and 196 in the 30 days before it.

After

  1. 2.21 km S of Lexington Hills, California · 13468 days ago · 9 km deep · 68 km away
  2. 2.04 km ENE of Zayante, California · 13468 days ago · 12 km deep · 67 km away
  3. 1.64 km WNW of San Juan Bautista, California · 13468 days ago · 6 km deep · 21 km away
  4. 1.722 km NE of San Lucas, California · 13468 days ago · 6 km deep · 73 km away
  5. 1.95 km ESE of Interlaken, California · 13468 days ago · 10 km deep · 33 km away
  6. 1.65 km ESE of East Foothills, California · 13468 days ago · 0 km deep · 75 km away
  7. 1.618 km ENE of Gonzales, California · 13468 days ago · 9 km deep · 23 km away
  8. 1.65 km E of Interlaken, California · 13468 days ago · 5 km deep · 34 km away
  9. 2.622 km NE of Soledad, California · 13468 days ago · 4 km deep · 26 km away
  10. 2.223 km NE of Soledad, California · 13468 days ago · 9 km deep · 31 km away
  11. 2.07 km NW of Diablo Grande, California · 13467 days ago · 0 km deep · 76 km away
  12. 1.76 km WSW of Davenport, California · 13467 days ago · 7 km deep · 83 km away
  13. 2.27 km NE of Day Valley, California · 13467 days ago · 3 km deep · 53 km away
  14. 1.54 km ESE of Interlaken, California · 13467 days ago · 12 km deep · 33 km away
  15. 1.624 km NE of Greenfield, California · 13467 days ago · 5 km deep · 46 km away
  16. 1.96 km ESE of Lexington Hills, California · 13466 days ago · 11 km deep · 63 km away
  17. 2.123 km NE of Soledad, California · 13466 days ago · 8 km deep · 31 km away
  18. 1.56 km NE of Day Valley, California · 13466 days ago · 7 km deep · 51 km away
  19. 1.52 km WSW of San Juan Bautista, California · 13466 days ago · 4 km deep · 19 km away
  20. 2.15 km WSW of Cupertino, California · 13466 days ago · 6 km deep · 87 km away
  21. 1.55 km WSW of Cupertino, California · 13466 days ago · 6 km deep · 87 km away
  22. 1.73 km NNE of Amesti, California · 13466 days ago · 14 km deep · 43 km away
  23. 1.54 km NE of Amesti, California · 13466 days ago · 13 km deep · 41 km away
  24. 2.93 km NNW of Aromas, California · 13466 days ago · 9 km deep · 30 km away
  25. 1.85 km ESE of Lexington Hills, California · 13466 days ago · 11 km deep · 63 km away
  26. 1.66 km SE of Lexington Hills, California · 13465 days ago · 8 km deep · 62 km away
  27. 1.65 km S of Loyola, California · 13465 days ago · 7 km deep · 87 km away
  28. 2.19 km NE of Gilroy, California · 13465 days ago · 8 km deep · 34 km away
  29. 1.65 km SW of Gilroy, California · 13465 days ago · 1 km deep · 32 km away
  30. 1.54 km E of Interlaken, California · 13465 days ago · 10 km deep · 34 km away
  31. 1.69 km SE of San Juan Bautista, California · 13465 days ago · 6 km deep · 8 km away
  32. 1.85 km S of Loyola, California · 13465 days ago · 7 km deep · 87 km away
  33. 2.07 km ENE of Scotts Valley, California · 13465 days ago · 15 km deep · 60 km away
  34. 1.68 km SSE of Lexington Hills, California · 13465 days ago · 13 km deep · 61 km away
  35. 1.624 km ENE of Soledad, California · 13465 days ago · 2 km deep · 40 km away
  36. 2.58 km NW of Day Valley, California · 13465 days ago · 13 km deep · 61 km away
  37. 1.841 km W of Lockwood, California · 13465 days ago · 16 km deep · 92 km away
  38. 1.93 km W of Saratoga, California · 13465 days ago · 5 km deep · 82 km away
  39. 1.66 km NW of Day Valley, California · 13465 days ago · 12 km deep · 59 km away
  40. 1.819 km SW of Gustine, California · 13464 days ago · 0 km deep · 45 km away
  41. 1.817 km SW of Davenport, California · 13464 days ago · 22 km deep · 83 km away
  42. 2.02 km NNE of Lexington Hills, California · 13464 days ago · 5 km deep · 70 km away
  43. 1.6Northern California · 13464 days ago · 9 km deep · 51 km away
  44. 1.58 km NW of Day Valley, California · 13464 days ago · 14 km deep · 61 km away
  45. 2.05 km ESE of Interlaken, California · 13464 days ago · 11 km deep · 33 km away
  46. 1.64 km NNE of Interlaken, California · 13464 days ago · 7 km deep · 39 km away
  47. 1.85 km N of Aromas, California · 13464 days ago · 3 km deep · 30 km away
  48. 1.73 km SSW of Lexington Hills, California · 13463 days ago · 14 km deep · 68 km away
  49. 1.58 km NW of Moss Landing, California · 13463 days ago · 3 km deep · 44 km away
  50. 1.96 km ENE of Day Valley, California · 13463 days ago · 5 km deep · 49 km away
  51. 1.88 km SE of Lexington Hills, California · 13463 days ago · 7 km deep · 61 km away
  52. 1.85 km NNW of Aromas, California · 13463 days ago · 10 km deep · 32 km away
  53. 1.68 km S of La Selva Beach, California · 13463 days ago · 4 km deep · 44 km away
  54. 2.25 km ENE of Day Valley, California · 13463 days ago · 5 km deep · 49 km away
  55. 2.92 km ESE of Aromas, California · 13463 days ago · 6 km deep · 24 km away
  56. 1.60 km SSE of Lexington Hills, California · 13462 days ago · 8 km deep · 68 km away
  57. 1.55 km SSE of San Juan Bautista, California · 13462 days ago · 5 km deep · 13 km away
  58. 1.69 km N of Day Valley, California · 13462 days ago · 2 km deep · 59 km away
  59. 1.8Central California · 13462 days ago · 5 km deep · 12 km away
  60. 2.16 km SW of Monte Sereno, California · 13462 days ago · 13 km deep · 76 km away

The first 60 of 193.

Before

  1. 1.75 km SSW of Ridgemark, California · 13469 days ago · 7 km deep · 0 km away
  2. 1.624 km NE of Greenfield, California · 13469 days ago · 5 km deep · 45 km away
  3. 2.824 km NE of Greenfield, California · 13469 days ago · 5 km deep · 45 km away
  4. 2.03 km NNE of Amesti, California · 13469 days ago · 14 km deep · 43 km away
  5. 1.77 km NE of Lockwood, California · 13469 days ago · 9 km deep · 91 km away
  6. 2.29 km SW of Ridgemark, California · 13469 days ago · 6 km deep · 6 km away
  7. 1.75 km E of Interlaken, California · 13469 days ago · 6 km deep · 33 km away
  8. 1.62 km WNW of Los Altos Hills, California · 13469 days ago · 4 km deep · 98 km away
  9. 1.77 km ENE of Day Valley, California · 13469 days ago · 7 km deep · 50 km away
  10. 2.07 km ENE of Day Valley, California · 13469 days ago · 8 km deep · 49 km away
  11. 2.47 km ENE of Day Valley, California · 13469 days ago · 8 km deep · 50 km away
  12. 2.17 km ENE of Day Valley, California · 13469 days ago · 8 km deep · 50 km away
  13. 2.77 km ENE of Day Valley, California · 13469 days ago · 8 km deep · 49 km away
  14. 2.07 km ENE of Day Valley, California · 13469 days ago · 8 km deep · 50 km away
  15. 1.56 km ENE of Zayante, California · 13469 days ago · 18 km deep · 65 km away
  16. 1.6Central California · 13469 days ago · 4 km deep · 48 km away
  17. 1.84 km SSW of Lexington Hills, California · 13470 days ago · 15 km deep · 68 km away
  18. 2.41 km ESE of Lexington Hills, California · 13470 days ago · 9 km deep · 67 km away
  19. 1.824 km NE of Greenfield, California · 13470 days ago · 5 km deep · 45 km away
  20. 2.824 km NE of Greenfield, California · 13470 days ago · 5 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc147704. Read Sat, Oct 3, 2026, 3:18 PM UTC.