California earthquakes

M2.4 earthquake Central California

A magnitude 2.4 earthquake struck in Central California on Sat, May 21, 1977, 9:23 PM PDT (04:23 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.4 10 km ESE of Livermore, California. This one was a foreshock.

Aromas 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
2.4 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-05-22 04:23:20 UTC
Depth
7.1 km (4.4 mi), shallow
Epicenter
36.872° N, 121.607° 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
±0.32
Depth from
From location
Station coverage gap
59°
Stations used
39

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 142 in the 60 days after this one and 65 in the 30 days before it.

After

  1. 1.67 km WSW of Gilroy, California · 18030 days ago · 4 km deep · 14 km away
  2. 1.733 km SW of South Dos Palos, California · 18030 days ago · 8 km deep · 64 km away
  3. 1.79 km NNE of East Foothills, California · 18030 days ago · 8 km deep · 67 km away
  4. 2.27 km NE of Hollister, California · 18028 days ago · 5 km deep · 24 km away
  5. 1.86 km NE of Hollister, California · 18028 days ago · 5 km deep · 24 km away
  6. 2.121 km NE of Soledad, California · 18027 days ago · 4 km deep · 49 km away
  7. 3.013 km S of Tres Pinos, California · 18024 days ago · 5 km deep · 36 km away
  8. 1.66 km NNE of Interlaken, California · 18024 days ago · 6 km deep · 17 km away
  9. 1.78 km NE of San Juan Bautista, California · 18023 days ago · 5 km deep · 12 km away
  10. 2.40 km E of Aromas, California · 18023 days ago · 9 km deep · 3 km away
  11. 1.55 km SSW of Tres Pinos, California · 18023 days ago · 7 km deep · 28 km away
  12. 2.19 km S of Tres Pinos, California · 18023 days ago · 3 km deep · 30 km away
  13. 1.75 km SSW of Tres Pinos, California · 18023 days ago · 3 km deep · 28 km away
  14. 2.124 km NE of Greenfield, California · 18023 days ago · 7 km deep · 66 km away
  15. 2.724 km SE of Tres Pinos, California · 18022 days ago · 8 km deep · 49 km away
  16. 2.026 km NE of Soledad, California · 18021 days ago · 5 km deep · 57 km away
  17. 1.827 km NE of Soledad, California · 18021 days ago · 6 km deep · 57 km away
  18. 1.621 km NE of Soledad, California · 18020 days ago · 2 km deep · 50 km away
  19. 1.721 km NNE of Soledad, California · 18020 days ago · 1 km deep · 47 km away
  20. 2.224 km NE of Greenfield, California · 18019 days ago · 7 km deep · 68 km away
  21. 1.625 km SE of Tres Pinos, California · 18018 days ago · 6 km deep · 51 km away
  22. 2.032 km SSW of South Dos Palos, California · 18018 days ago · -1 km deep · 71 km away
  23. 1.614 km N of Morgan Hill, California · 18018 days ago · 0 km deep · 44 km away
  24. 1.527 km SE of Tres Pinos, California · 18017 days ago · 4 km deep · 53 km away
  25. 1.86 km NE of Ridgemark, California · 18016 days ago · 6 km deep · 26 km away
  26. 1.924 km NE of Greenfield, California · 18016 days ago · 7 km deep · 66 km away
  27. 1.77 km NE of Interlaken, California · 18013 days ago · 4 km deep · 14 km away
  28. 1.87 km NE of Interlaken, California · 18013 days ago · 3 km deep · 14 km away
  29. 2.26 km NNE of Interlaken, California · 18013 days ago · 7 km deep · 17 km away
  30. 1.69 km NW of Hollister, California · 18013 days ago · 4 km deep · 13 km away
  31. 1.529 km SE of Tres Pinos, California · 18013 days ago · 8 km deep · 55 km away
  32. 2.418 km SE of Tres Pinos, California · 18011 days ago · 8 km deep · 44 km away
  33. 2.721 km NE of Soledad, California · 18010 days ago · 3 km deep · 52 km away
  34. 1.921 km NE of Soledad, California · 18010 days ago · 3 km deep · 52 km away
  35. 2.924 km ENE of Greenfield, California · 18010 days ago · 7 km deep · 75 km away
  36. 2.17 km E of East Foothills, California · 18009 days ago · 6 km deep · 57 km away
  37. 1.714 km E of Seven Trees, California · 18009 days ago · 3 km deep · 47 km away
  38. 2.616 km W of Diablo Grande, California · 18008 days ago · 6 km deep · 58 km away
  39. 1.613 km E of Seven Trees, California · 18008 days ago · 5 km deep · 47 km away
  40. 2.822 km NNE of Soledad, California · 18008 days ago · 3 km deep · 47 km away
  41. 2.221 km SSE of Tres Pinos, California · 18008 days ago · 5 km deep · 45 km away
  42. 1.925 km ENE of Soledad, California · 18007 days ago · 10 km deep · 59 km away
  43. 1.623 km NNE of San Lucas, California · 18006 days ago · 4 km deep · 89 km away
  44. 2.322 km NE of Soledad, California · 18006 days ago · 4 km deep · 57 km away
  45. 1.92 km S of San Juan Bautista, California · 18004 days ago · 6 km deep · 8 km away
  46. 2.64 km SSW of Gilroy, California · 18003 days ago · 7 km deep · 11 km away
  47. 2.02 km S of San Juan Bautista, California · 18003 days ago · 6 km deep · 8 km away
  48. 1.85 km NNE of Tres Pinos, California · 18002 days ago · 7 km deep · 27 km away
  49. 1.711 km SE of Livermore, California · 18002 days ago · 11 km deep · 83 km away
  50. 4.410 km ESE of Livermore, California · 18001 days ago · 11 km deep · 85 km away
  51. 1.810 km SE of Livermore, California · 18001 days ago · 9 km deep · 84 km away
  52. 3.024 km ENE of Greenfield, California · 18000 days ago · 7 km deep · 72 km away
  53. 2.123 km ENE of Greenfield, California · 18000 days ago · 5 km deep · 72 km away
  54. 2.421 km E of Tres Pinos, California · 18000 days ago · 8 km deep · 47 km away
  55. 1.98 km ENE of San Martin, California · 18000 days ago · 7 km deep · 29 km away
  56. 1.88 km ENE of San Martin, California · 18000 days ago · 7 km deep · 29 km away
  57. 1.59 km N of Day Valley, California · 17999 days ago · 10 km deep · 36 km away
  58. 1.9Northern California · 17999 days ago · 8 km deep · 83 km away
  59. 2.525 km ENE of Greenfield, California · 17999 days ago · -1 km deep · 72 km away
  60. 1.921 km NE of Soledad, California · 17999 days ago · 6 km deep · 54 km away

The first 60 of 142.

Before

  1. 2.12 km SSW of Hollister, California · 18031 days ago · 5 km deep · 18 km away
  2. 2.030 km NE of San Lucas, California · 18032 days ago · 11 km deep · 99 km away
  3. 2.414 km S of Tres Pinos, California · 18032 days ago · 8 km deep · 37 km away
  4. 1.725 km NE of Soledad, California · 18033 days ago · 7 km deep · 57 km away
  5. 1.67 km NNE of Hollister, California · 18033 days ago · 6 km deep · 22 km away
  6. 2.37 km SSW of Tres Pinos, California · 18034 days ago · 7 km deep · 29 km away
  7. 2.17 km W of Gilroy, California · 18034 days ago · 5 km deep · 14 km away
  8. 1.624 km NE of Greenfield, California · 18034 days ago · 7 km deep · 68 km away
  9. 1.911 km NNW of Hollister, California · 18035 days ago · 4 km deep · 17 km away
  10. 2.125 km NE of Soledad, California · 18035 days ago · 5 km deep · 58 km away
  11. 1.711 km ESE of Gilroy, California · 18035 days ago · 5 km deep · 17 km away
  12. 2.323 km NE of Greenfield, California · 18035 days ago · 7 km deep · 68 km away
  13. 2.16 km N of East Foothills, California · 18035 days ago · 5 km deep · 66 km away
  14. 2.312 km NNW of Hollister, California · 18036 days ago · 5 km deep · 17 km away
  15. 2.02 km WSW of San Juan Bautista, California · 18038 days ago · 6 km deep · 5 km away
  16. 1.620 km ESE of Tres Pinos, California · 18038 days ago · 0 km deep · 47 km away
  17. 1.821 km NE of Soledad, California · 18039 days ago · 3 km deep · 53 km away
  18. 1.610 km N of Morgan Hill, California · 18040 days ago · 6 km deep · 40 km away
  19. 2.429 km ENE of Soledad, California · 18041 days ago · 7 km deep · 60 km away
  20. 2.136 km W of Three Rocks, California · 18042 days ago · 3 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1035222. Read Fri, Oct 2, 2026, 5:36 PM UTC.