California earthquakes

M1.6 earthquake 4 km W of Ridgemark, California

A magnitude 1.6 earthquake struck 4 km W of Ridgemark, California on Mon, Dec 11, 1989, 12:28 PM PST (20:28 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M4.3 36 km WSW of Three Rocks, 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1989-12-11 20:28:14 UTC
Depth
11.2 km (7.0 mi), shallow
Epicenter
36.813° N, 121.413° 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 0.4 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
64°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 191 in the 60 days after this one and 192 in the 30 days before it.

After

  1. 2.44 km WSW of Ridgemark, California · 13446 days ago · 10 km deep · 1 km away
  2. 2.224 km ENE of Greenfield, California · 13446 days ago · 5 km deep · 54 km away
  3. 3.62 km SSW of Lexington Hills, California · 13446 days ago · 13 km deep · 62 km away
  4. 1.611 km S of Tres Pinos, California · 13445 days ago · 4 km deep · 16 km away
  5. 2.110 km S of Tres Pinos, California · 13445 days ago · 4 km deep · 16 km away
  6. 1.79 km ESE of Lexington Hills, California · 13445 days ago · 4 km deep · 54 km away
  7. 1.64 km E of Interlaken, California · 13445 days ago · 10 km deep · 28 km away
  8. 1.616 km SSE of Tres Pinos, California · 13445 days ago · 5 km deep · 22 km away
  9. 1.52 km NNW of Aromas, California · 13445 days ago · 10 km deep · 24 km away
  10. 2.413 km N of Morgan Hill, California · 13445 days ago · 3 km deep · 52 km away
  11. 1.715 km E of Seven Trees, California · 13445 days ago · 3 km deep · 57 km away
  12. 1.82 km NNW of Aromas, California · 13444 days ago · 9 km deep · 24 km away
  13. 2.02 km NW of Saratoga, California · 13444 days ago · 5 km deep · 76 km away
  14. 1.612 km NE of East Foothills, California · 13444 days ago · 6 km deep · 78 km away
  15. 1.711 km S of Tres Pinos, California · 13444 days ago · 5 km deep · 16 km away
  16. 1.64 km E of Interlaken, California · 13444 days ago · 10 km deep · 28 km away
  17. 2.35 km WNW of San Juan Bautista, California · 13444 days ago · 7 km deep · 17 km away
  18. 2.18 km ENE of Morgan Hill, California · 13444 days ago · 4 km deep · 42 km away
  19. 1.65 km NE of Corralitos, California · 13443 days ago · 3 km deep · 39 km away
  20. 1.67 km ENE of Day Valley, California · 13443 days ago · 8 km deep · 44 km away
  21. 2.06 km NE of Day Valley, California · 13443 days ago · 10 km deep · 46 km away
  22. 2.12 km W of Monte Sereno, California · 13443 days ago · 8 km deep · 71 km away
  23. 1.85 km SE of Sunol, California · 13443 days ago · 6 km deep · 91 km away
  24. 1.65 km SW of Gilroy, California · 13443 days ago · 2 km deep · 24 km away
  25. 1.83 km SE of Los Gatos, California · 13443 days ago · 2 km deep · 64 km away
  26. 2.03 km NNW of Hollister, California · 13443 days ago · 7 km deep · 8 km away
  27. 1.621 km NE of Soledad, California · 13443 days ago · 3 km deep · 36 km away
  28. 2.96 km WSW of Gilroy, California · 13443 days ago · 3 km deep · 28 km away
  29. 2.86 km WSW of Gilroy, California · 13443 days ago · 3 km deep · 28 km away
  30. 1.925 km SE of Tres Pinos, California · 13442 days ago · 5 km deep · 34 km away
  31. 2.82 km S of San Juan Bautista, California · 13442 days ago · 5 km deep · 11 km away
  32. 1.68 km ENE of San Martin, California · 13442 days ago · 8 km deep · 36 km away
  33. 1.618 km NE of East Foothills, California · 13442 days ago · 5 km deep · 81 km away
  34. 1.5Central California · 13442 days ago · 6 km deep · 40 km away
  35. 1.521 km NE of Soledad, California · 13441 days ago · 5 km deep · 38 km away
  36. 1.62 km N of Interlaken, California · 13441 days ago · 14 km deep · 34 km away
  37. 2.58 km ESE of East Foothills, California · 13441 days ago · 6 km deep · 66 km away
  38. 2.424 km NE of Greenfield, California · 13441 days ago · 7 km deep · 49 km away
  39. 1.76 km ENE of East Foothills, California · 13441 days ago · 8 km deep · 73 km away
  40. 1.617 km SSE of Tres Pinos, California · 13440 days ago · 3 km deep · 23 km away
  41. 1.60 km WSW of Lexington Hills, California · 13440 days ago · 9 km deep · 64 km away
  42. 1.59 km ENE of Day Valley, California · 13440 days ago · 3 km deep · 42 km away
  43. 2.913 km S of Tres Pinos, California · 13440 days ago · 3 km deep · 19 km away
  44. 1.829 km SSW of South Dos Palos, California · 13440 days ago · 1 km deep · 58 km away
  45. 1.620 km ENE of Big Sur, California · 13440 days ago · 9 km deep · 54 km away
  46. 1.78 km ENE of Gilroy, California · 13440 days ago · 6 km deep · 24 km away
  47. 1.625 km SE of Tres Pinos, California · 13440 days ago · 5 km deep · 33 km away
  48. 2.94 km W of San Juan Bautista, California · 13440 days ago · 6 km deep · 16 km away
  49. 1.83 km WNW of San Juan Bautista, California · 13440 days ago · 6 km deep · 15 km away
  50. 1.924 km NE of King City, California · 13440 days ago · 0 km deep · 62 km away
  51. 3.75 km WNW of Day Valley, California · 13440 days ago · 18 km deep · 52 km away
  52. 1.92 km S of Rio Del Mar, California · 13440 days ago · 50 km deep · 45 km away
  53. 1.72 km SSW of Lexington Hills, California · 13440 days ago · 12 km deep · 63 km away
  54. 1.55 km ESE of Lexington Hills, California · 13439 days ago · 11 km deep · 58 km away
  55. 3.810 km S of Tres Pinos, California · 13439 days ago · 5 km deep · 14 km away
  56. 2.210 km S of Tres Pinos, California · 13439 days ago · 4 km deep · 15 km away
  57. 1.910 km S of Tres Pinos, California · 13439 days ago · 4 km deep · 15 km away
  58. 1.65 km ESE of Interlaken, California · 13439 days ago · 7 km deep · 27 km away
  59. 1.68 km ENE of Gilroy, California · 13439 days ago · 7 km deep · 25 km away
  60. 2.310 km S of Tres Pinos, California · 13439 days ago · 4 km deep · 14 km away

The first 60 of 191.

Before

  1. 1.71 km NE of Interlaken, California · 13446 days ago · 13 km deep · 32 km away
  2. 1.67 km SSE of Gilroy, California · 13446 days ago · 4 km deep · 18 km away
  3. 2.58 km SSE of Gilroy, California · 13446 days ago · 6 km deep · 18 km away
  4. 1.821 km NE of Soledad, California · 13446 days ago · 6 km deep · 37 km away
  5. 2.27 km ENE of Interlaken, California · 13446 days ago · 3 km deep · 28 km away
  6. 2.322 km ENE of Soledad, California · 13447 days ago · 10 km deep · 43 km away
  7. 1.83 km NNW of Corralitos, California · 13447 days ago · 15 km deep · 43 km away
  8. 1.825 km ESE of Tres Pinos, California · 13447 days ago · 12 km deep · 34 km away
  9. 1.69 km SE of Lexington Hills, California · 13447 days ago · 4 km deep · 54 km away
  10. 1.73 km SE of Day Valley, California · 13447 days ago · 16 km deep · 44 km away
  11. 2.67 km NE of Interlaken, California · 13447 days ago · 3 km deep · 30 km away
  12. 2.2Northern California · 13447 days ago · 13 km deep · 61 km away
  13. 2.04 km S of Lexington Hills, California · 13448 days ago · 13 km deep · 60 km away
  14. 1.617 km SSE of Tres Pinos, California · 13448 days ago · 6 km deep · 23 km away
  15. 2.39 km NE of Gilroy, California · 13448 days ago · 8 km deep · 28 km away
  16. 2.121 km NE of Soledad, California · 13448 days ago · 7 km deep · 33 km away
  17. 1.63 km S of Lexington Hills, California · 13448 days ago · 14 km deep · 61 km away
  18. 2.26 km S of Loyola, California · 13448 days ago · 5 km deep · 81 km away
  19. 1.74 km ENE of Interlaken, California · 13449 days ago · 5 km deep · 30 km away
  20. 1.811 km S of Tres Pinos, California · 13449 days ago · 5 km deep · 16 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc149436. Read Sun, Oct 4, 2026, 6:11 PM UTC.