California earthquakes

M1.6 earthquake 11 km SW of Ridgemark, California

A magnitude 1.6 earthquake struck 11 km SW of Ridgemark, California on Sat, Jun 24, 1978, 8:36 AM PDT (15:36 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.2 12 km S of Davenport, 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), micro
Local time
UTC
1978-06-24 15:36:26 UTC
Depth
6.8 km (4.2 mi), shallow
Epicenter
36.753° N, 121.465° 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 0.5 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
100°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 67 in the 30 days before it.

After

  1. 2.911 km ESE of Gilroy, California · 17629 days ago · 5 km deep · 23 km away
  2. 1.5Central California · 17629 days ago · 4 km deep · 60 km away
  3. 1.912 km S of Pescadero, California · 17628 days ago · 14 km deep · 93 km away
  4. 2.523 km ENE of Soledad, California · 17628 days ago · 4 km deep · 45 km away
  5. 1.824 km SE of Tres Pinos, California · 17627 days ago · 10 km deep · 34 km away
  6. 1.624 km SE of Tres Pinos, California · 17627 days ago · 10 km deep · 34 km away
  7. 3.111 km ESE of Gilroy, California · 17627 days ago · 5 km deep · 23 km away
  8. 2.511 km ESE of Gilroy, California · 17627 days ago · 5 km deep · 23 km away
  9. 1.74 km SSW of Gilroy, California · 17626 days ago · 4 km deep · 26 km away
  10. 1.62 km SSE of Portola Valley, California · 17626 days ago · 9 km deep · 95 km away
  11. 1.514 km E of Seven Trees, California · 17626 days ago · 2 km deep · 63 km away
  12. 2.312 km ESE of Gilroy, California · 17626 days ago · 4 km deep · 23 km away
  13. 1.723 km NE of King City, California · 17625 days ago · 4 km deep · 65 km away
  14. 1.68 km NW of Hollister, California · 17625 days ago · 6 km deep · 17 km away
  15. 2.621 km NE of Soledad, California · 17624 days ago · 5 km deep · 33 km away
  16. 2.322 km NE of Soledad, California · 17624 days ago · 3 km deep · 39 km away
  17. 2.022 km NE of Soledad, California · 17623 days ago · 2 km deep · 39 km away
  18. 2.210 km S of Tres Pinos, California · 17623 days ago · 4 km deep · 15 km away
  19. 2.110 km S of Tres Pinos, California · 17623 days ago · 3 km deep · 14 km away
  20. 2.52 km NNW of Aromas, California · 17623 days ago · 10 km deep · 24 km away
  21. 2.512 km SSE of Davenport, California · 17622 days ago · 8 km deep · 64 km away
  22. 4.212 km S of Davenport, California · 17622 days ago · 11 km deep · 65 km away
  23. 1.78 km NE of San Juan Bautista, California · 17622 days ago · 6 km deep · 17 km away
  24. 1.89 km SSE of Davenport, California · 17621 days ago · 10 km deep · 63 km away
  25. 3.210 km S of Tres Pinos, California · 17621 days ago · 4 km deep · 15 km away
  26. 1.66 km ENE of Aromas, California · 17620 days ago · 7 km deep · 21 km away
  27. 2.221 km NE of Soledad, California · 17620 days ago · 2 km deep · 35 km away
  28. 1.712 km ESE of East Foothills, California · 17620 days ago · 4 km deep · 67 km away
  29. 2.115 km SSE of Tres Pinos, California · 17620 days ago · 3 km deep · 20 km away
  30. 1.66 km E of Big Sur, California · 17618 days ago · 12 km deep · 60 km away
  31. 3.010 km S of Tres Pinos, California · 17617 days ago · 3 km deep · 14 km away
  32. 3.010 km S of Tres Pinos, California · 17617 days ago · 3 km deep · 14 km away
  33. 3.07 km SSE of San Juan Bautista, California · 17617 days ago · 8 km deep · 5 km away
  34. 1.818 km SE of Big Sur, California · 17617 days ago · 12 km deep · 67 km away
  35. 3.08 km NW of Hollister, California · 17616 days ago · 7 km deep · 17 km away
  36. 1.58 km SW of Ridgemark, California · 17616 days ago · 7 km deep · 4 km away
  37. 2.44 km ESE of Aromas, California · 17616 days ago · 6 km deep · 17 km away
  38. 1.817 km E of East Foothills, California · 17614 days ago · 6 km deep · 69 km away
  39. 1.714 km E of Seven Trees, California · 17614 days ago · 2 km deep · 63 km away
  40. 2.43 km N of East Foothills, California · 17612 days ago · 0 km deep · 80 km away
  41. 2.94 km N of East Foothills, California · 17612 days ago · 1 km deep · 80 km away
  42. 1.74 km N of East Foothills, California · 17612 days ago · 1 km deep · 80 km away
  43. 2.011 km SE of Livermore, California · 17612 days ago · 3 km deep · 97 km away
  44. 1.511 km NE of East Foothills, California · 17611 days ago · 1 km deep · 80 km away
  45. 2.413 km SSE of Tres Pinos, California · 17611 days ago · 4 km deep · 19 km away
  46. 2.213 km SSE of Tres Pinos, California · 17611 days ago · 4 km deep · 19 km away
  47. 2.43 km SSW of San Juan Bautista, CA · 17610 days ago · 7 km deep · 11 km away
  48. 1.925 km SE of Tres Pinos, California · 17607 days ago · 15 km deep · 34 km away
  49. 2.02 km W of Cambrian Park, California · 17607 days ago · 7 km deep · 72 km away
  50. 2.65 km WSW of Gilroy, California · 17607 days ago · 6 km deep · 29 km away
  51. 1.92 km SSW of Cambrian Park, California · 17606 days ago · 5 km deep · 69 km away
  52. 1.611 km NW of Big Sur, California · 17605 days ago · 6 km deep · 61 km away
  53. 3.28 km NE of Interlaken, California · 17605 days ago · 5 km deep · 33 km away
  54. 1.711 km ESE of Seven Trees, California · 17605 days ago · 4 km deep · 61 km away
  55. 1.925 km ESE of Tres Pinos, California · 17604 days ago · 4 km deep · 36 km away
  56. 1.822 km NE of San Lucas, California · 17604 days ago · 7 km deep · 78 km away
  57. 2.413 km N of Morgan Hill, California · 17603 days ago · 5 km deep · 58 km away
  58. 1.622 km ENE of Soledad, California · 17603 days ago · 4 km deep · 43 km away
  59. 2.225 km NE of Soledad, California · 17603 days ago · 8 km deep · 35 km away
  60. 2.08 km ENE of San Martin, California · 17597 days ago · 7 km deep · 41 km away

The first 60 of 112.

Before

  1. 1.6Central California · 17630 days ago · 7 km deep · 1 km away
  2. 1.62 km WSW of San Juan Bautista, California · 17630 days ago · 3 km deep · 13 km away
  3. 1.611 km ESE of Livermore, California · 17631 days ago · 8 km deep · 99 km away
  4. 2.210 km SW of Ridgemark, California · 17631 days ago · 7 km deep · 1 km away
  5. 1.811 km ESE of Gilroy, California · 17632 days ago · 5 km deep · 23 km away
  6. 2.011 km ESE of Gilroy, California · 17632 days ago · 5 km deep · 23 km away
  7. 3.011 km ESE of Gilroy, California · 17632 days ago · 5 km deep · 23 km away
  8. 2.211 km S of Tres Pinos, California · 17635 days ago · 3 km deep · 15 km away
  9. 2.02 km SE of San Ardo, California · 17636 days ago · 13 km deep · 98 km away
  10. 2.56 km ESE of Sunol, California · 17636 days ago · 11 km deep · 98 km away
  11. 1.622 km SSE of Tres Pinos, California · 17636 days ago · 5 km deep · 29 km away
  12. 2.613 km NE of East Foothills, California · 17637 days ago · 8 km deep · 84 km away
  13. 1.813 km NE of East Foothills, California · 17637 days ago · 8 km deep · 84 km away
  14. 2.024 km ENE of Greenfield, California · 17637 days ago · 6 km deep · 54 km away
  15. 2.233 km ENE of Soledad, California · 17638 days ago · 17 km deep · 49 km away
  16. 1.921 km NE of Soledad, California · 17639 days ago · 5 km deep · 32 km away
  17. 1.89 km ESE of Gilroy, California · 17639 days ago · 3 km deep · 25 km away
  18. 1.52 km S of Hollister, California · 17639 days ago · 8 km deep · 10 km away
  19. 1.612 km ENE of Salinas, California · 17640 days ago · -1 km deep · 7 km away
  20. 1.96 km WSW of Gilroy, California · 17640 days ago · 4 km deep · 30 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1040780. Read Wed, Sep 30, 2026, 3:21 AM UTC.