California earthquakes

M1.6 earthquake 7 km SSW of Ridgemark, California

A magnitude 1.6 earthquake struck 7 km SSW of Ridgemark, California on Fri, Mar 30, 1984, 6:01 PM PST (02:01 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M6.2 The 1984 Morgan Hill, 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-03-31 02:01:57 UTC
Depth
-0.2 km (-0.2 mi), shallow
Epicenter
36.747° N, 121.386° 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, 0.7 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
133°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 185 in the 60 days after this one and 51 in the 30 days before it.

After

  1. 1.67 km E of East Foothills, California · 15524 days ago · 5 km deep · 76 km away
  2. 2.027 km WNW of Three Rocks, California · 15523 days ago · 8 km deep · 65 km away
  3. 2.322 km NE of Soledad, California · 15523 days ago · 3 km deep · 25 km away
  4. 2.316 km W of Volta, California · 15522 days ago · 0 km deep · 47 km away
  5. 1.55 km SSW of Gilroy, California · 15522 days ago · 3 km deep · 30 km away
  6. 1.924 km ENE of Soledad, California · 15522 days ago · 3 km deep · 40 km away
  7. 1.730 km WNW of Three Rocks, California · 15521 days ago · 7 km deep · 63 km away
  8. 2.1Central California · 15520 days ago · 13 km deep · 87 km away
  9. 2.35 km SSW of Gilroy, California · 15519 days ago · 3 km deep · 30 km away
  10. 1.616 km NNW of Coalinga, California · 15519 days ago · 9 km deep · 99 km away
  11. 1.935 km SSW of South Dos Palos, California · 15519 days ago · 4 km deep · 47 km away
  12. 2.135 km SSW of South Dos Palos, California · 15519 days ago · 5 km deep · 48 km away
  13. 2.423 km ENE of Soledad, California · 15518 days ago · 4 km deep · 39 km away
  14. 2.124 km NE of Greenfield, California · 15518 days ago · 6 km deep · 43 km away
  15. 2.124 km ENE of Soledad, California · 15518 days ago · 4 km deep · 40 km away
  16. 1.733 km W of Lockwood, California · 15518 days ago · 3 km deep · 94 km away
  17. 2.88 km W of Diablo Grande, California · 15518 days ago · 10 km deep · 73 km away
  18. 2.323 km WSW of Lockwood, California · 15518 days ago · 7 km deep · 98 km away
  19. 1.95 km SSE of San Juan Bautista, California · 15517 days ago · 5 km deep · 13 km away
  20. 2.224 km NE of Greenfield, California · 15516 days ago · 5 km deep · 43 km away
  21. 1.63 km NNW of Hollister, California · 15515 days ago · 6 km deep · 15 km away
  22. 1.820 km SSE of Tres Pinos, California · 15515 days ago · 4 km deep · 20 km away
  23. 2.722 km SSW of Three Rocks, California · 15514 days ago · 9 km deep · 91 km away
  24. 1.923 km NE of San Ardo, California · 15514 days ago · 7 km deep · 85 km away
  25. 1.618 km SSW of Three Rocks, California · 15514 days ago · 33 km deep · 96 km away
  26. 1.815 km E of Big Sur, California · 15513 days ago · 14 km deep · 58 km away
  27. 1.922 km NE of Soledad, California · 15512 days ago · 2 km deep · 33 km away
  28. 1.55 km SW of Tres Pinos, California · 15511 days ago · 9 km deep · 2 km away
  29. 1.8Near the coast of Central California · 15510 days ago · 6 km deep · 96 km away
  30. 1.916 km NNW of Coalinga, California · 15510 days ago · 4 km deep · 100 km away
  31. 1.812 km SSW of Carmel Valley Village, California · 15509 days ago · 8 km deep · 55 km away
  32. 2.09 km NE of San Martin, California · 15509 days ago · 8 km deep · 45 km away
  33. 1.824 km NE of King City, California · 15509 days ago · 1 km deep · 56 km away
  34. 1.93 km W of San Juan Bautista, California · 15507 days ago · 6 km deep · 20 km away
  35. 1.822 km NE of San Lucas, California · 15506 days ago · 7 km deep · 72 km away
  36. 1.832 km W of Three Rocks, California · 15504 days ago · 10 km deep · 64 km away
  37. 1.821 km NE of Soledad, California · 15504 days ago · 6 km deep · 32 km away
  38. 1.78 km ESE of East Foothills, California · 15503 days ago · 2 km deep · 74 km away
  39. 2.025 km NNE of King City, California · 15502 days ago · 1 km deep · 53 km away
  40. 2.016 km WNW of Coalinga, California · 15502 days ago · 8 km deep · 97 km away
  41. 1.912 km N of Morgan Hill, California · 15502 days ago · 6 km deep · 59 km away
  42. 2.111 km S of Tres Pinos, California · 15501 days ago · 8 km deep · 9 km away
  43. 2.03 km ESE of Aromas, California · 15501 days ago · 6 km deep · 24 km away
  44. 1.53 km ESE of Aromas, California · 15501 days ago · 7 km deep · 24 km away
  45. 2.23 km ESE of Aromas, California · 15501 days ago · 7 km deep · 25 km away
  46. 1.54 km NE of San Martin, California · 15501 days ago · 5 km deep · 44 km away
  47. 6.2The 1984 Morgan Hill, California Earthquake · 15499 days ago · 8 km deep · 68 km away
  48. 3.915 km E of Seven Trees, California · 15499 days ago · 6 km deep · 65 km away
  49. 2.615 km E of Seven Trees, California · 15499 days ago · 9 km deep · 65 km away
  50. 3.415 km E of Seven Trees, California · 15499 days ago · 5 km deep · 65 km away
  51. 3.316 km N of Morgan Hill, California · 15499 days ago · 8 km deep · 63 km away
  52. 3.114 km N of Morgan Hill, California · 15499 days ago · 6 km deep · 62 km away
  53. 2.119 km ESE of East Foothills, California · 15499 days ago · 5 km deep · 66 km away
  54. 2.012 km N of Morgan Hill, California · 15499 days ago · 4 km deep · 60 km away
  55. 2.516 km E of Seven Trees, California · 15499 days ago · 8 km deep · 64 km away
  56. 2.116 km N of Morgan Hill, California · 15499 days ago · 5 km deep · 63 km away
  57. 1.711 km NNE of Morgan Hill, California · 15499 days ago · 9 km deep · 56 km away
  58. 1.810 km NE of Morgan Hill, California · 15499 days ago · 8 km deep · 53 km away
  59. 1.614 km N of Morgan Hill, California · 15499 days ago · 6 km deep · 62 km away
  60. 1.514 km E of Seven Trees, California · 15499 days ago · 4 km deep · 66 km away

The first 60 of 185.

Before

  1. 2.522 km NNE of Soledad, California · 15524 days ago · 4 km deep · 22 km away
  2. 1.57 km ESE of East Foothills, California · 15525 days ago · 6 km deep · 75 km away
  3. 2.47 km E of East Foothills, California · 15525 days ago · 6 km deep · 76 km away
  4. 2.67 km E of East Foothills, California · 15525 days ago · 6 km deep · 76 km away
  5. 1.69 km ENE of Gilroy, California · 15525 days ago · 8 km deep · 33 km away
  6. 1.71 km SW of Tres Pinos, California · 15526 days ago · 4 km deep · 6 km away
  7. 1.77 km NE of Tres Pinos, California · 15526 days ago · 6 km deep · 15 km away
  8. 2.02 km ESE of Tres Pinos, California · 15527 days ago · 7 km deep · 9 km away
  9. 1.67 km E of East Foothills, California · 15528 days ago · 6 km deep · 76 km away
  10. 4.010 km WSW of Ridgemark, California · 15529 days ago · 8 km deep · 7 km away
  11. 2.022 km SSW of Three Rocks, California · 15529 days ago · 10 km deep · 91 km away
  12. 1.69 km NE of San Martin, California · 15530 days ago · 8 km deep · 47 km away
  13. 2.419 km SW of Three Rocks, California · 15530 days ago · 72 km deep · 86 km away
  14. 1.625 km NE of Greenfield, California · 15530 days ago · 7 km deep · 45 km away
  15. 1.627 km NE of Soledad, California · 15530 days ago · 8 km deep · 34 km away
  16. 1.827 km NE of Soledad, California · 15530 days ago · 7 km deep · 34 km away
  17. 1.625 km SE of Big Sur, California · 15530 days ago · 2 km deep · 74 km away
  18. 2.221 km NE of Soledad, California · 15530 days ago · 7 km deep · 30 km away
  19. 2.519 km NW of Coalinga, California · 15531 days ago · 9 km deep · 95 km away
  20. 2.07 km NE of San Juan Bautista, California · 15532 days ago · 6 km deep · 17 km away

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From the USGS Earthquake Hazards Program and its partner networks, event nc1113313. Read Thu, Oct 1, 2026, 7:03 AM UTC.