California earthquakes

M1.7 earthquake 12 km WSW of Byron, California

A magnitude 1.7 earthquake struck 12 km WSW of Byron, California on Mon, Oct 7, 1985, 8:09 AM PDT (15:09 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.0 13 km N of Morgan Hill, California. This one was a foreshock.

Byron forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.7 (md), micro
Local time
UTC
1985-10-07 15:09:17 UTC
Depth
9.7 km (6.1 mi), shallow
Epicenter
37.806° N, 121.759° 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, 0.6 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
82°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 79 in the 60 days after this one and 44 in the 30 days before it.

After

  1. 3.013 km N of Morgan Hill, California · 14960 days ago · 5 km deep · 63 km away
  2. 2.89 km NE of Gilroy, California · 14960 days ago · 9 km deep · 87 km away
  3. 1.83 km N of Ashland, California · 14959 days ago · 4 km deep · 33 km away
  4. 2.216 km NE of East Foothills, California · 14957 days ago · 8 km deep · 38 km away
  5. 1.88 km ENE of Morgan Hill, California · 14957 days ago · 2 km deep · 74 km away
  6. 2.67 km WSW of Glen Ellen, California · 14956 days ago · 8 km deep · 94 km away
  7. 1.77 km NNE of San Martin, California · 14956 days ago · 4 km deep · 76 km away
  8. 1.615 km WNW of Davenport, California · 14955 days ago · 6 km deep · 98 km away
  9. 1.80 km WSW of Concord, California · 14955 days ago · 19 km deep · 31 km away
  10. 1.516 km E of Seven Trees, California · 14953 days ago · 6 km deep · 59 km away
  11. 1.73 km N of Piedmont, California · 14951 days ago · 12 km deep · 42 km away
  12. 1.88 km ENE of Morgan Hill, California · 14950 days ago · 1 km deep · 74 km away
  13. 1.814 km E of Seven Trees, California · 14948 days ago · 3 km deep · 57 km away
  14. 1.812 km ESE of Gilroy, California · 14948 days ago · 5 km deep · 97 km away
  15. 1.93 km ESE of Berkeley, California · 14948 days ago · 7 km deep · 43 km away
  16. 1.59 km NNE of San Martin, California · 14946 days ago · 5 km deep · 74 km away
  17. 1.711 km S of Pescadero, California · 14944 days ago · 15 km deep · 91 km away
  18. 2.65 km E of Rohnert Park, California · 14943 days ago · 7 km deep · 98 km away
  19. 1.66 km SSE of Gilroy, California · 14942 days ago · 3 km deep · 97 km away
  20. 2.52 km W of Concord, California · 14942 days ago · 13 km deep · 32 km away
  21. 2.114 km N of Morgan Hill, California · 14940 days ago · 3 km deep · 61 km away
  22. 1.64 km SSW of Lexington Hills, California · 14939 days ago · 0 km deep · 78 km away
  23. 1.68 km NNE of East Foothills, California · 14939 days ago · 9 km deep · 39 km away
  24. 1.612 km E of East Foothills, California · 14937 days ago · 5 km deep · 49 km away
  25. 2.115 km E of Seven Trees, California · 14936 days ago · 5 km deep · 58 km away
  26. 1.615 km E of Seven Trees, California · 14936 days ago · 5 km deep · 58 km away
  27. 2.47 km NE of Interlaken, California · 14935 days ago · 10 km deep · 91 km away
  28. 2.012 km ESE of East Foothills, California · 14933 days ago · 6 km deep · 54 km away
  29. 2.413 km N of Morgan Hill, California · 14933 days ago · 3 km deep · 63 km away
  30. 1.914 km E of Seven Trees, California · 14932 days ago · 5 km deep · 57 km away
  31. 3.011 km ESE of East Foothills, California · 14931 days ago · 8 km deep · 53 km away
  32. 1.613 km N of Morgan Hill, California · 14931 days ago · 3 km deep · 63 km away
  33. 1.87 km SSE of Livermore, California · 14929 days ago · 1 km deep · 21 km away
  34. 1.57 km ENE of Penngrove, California · 14929 days ago · 8 km deep · 93 km away
  35. 2.23 km WSW of Green Valley, California · 14929 days ago · 7 km deep · 62 km away
  36. 1.91 km ENE of Green Valley, California · 14929 days ago · 12 km deep · 61 km away
  37. 1.915 km E of Seven Trees, California · 14927 days ago · 6 km deep · 58 km away
  38. 2.115 km ESE of Suisun, California · 14926 days ago · 11 km deep · 44 km away
  39. 1.712 km SSE of Livermore, California · 14926 days ago · 7 km deep · 26 km away
  40. 1.56 km WSW of Gilroy, California · 14925 days ago · 3 km deep · 93 km away
  41. 1.714 km E of Seven Trees, California · 14924 days ago · 2 km deep · 57 km away
  42. 2.18 km NE of Milpitas, California · 14924 days ago · 7 km deep · 37 km away
  43. 1.914 km E of Seven Trees, California · 14924 days ago · 3 km deep · 57 km away
  44. 1.914 km E of Angwin, California · 14922 days ago · 1 km deep · 98 km away
  45. 2.06 km NE of East Foothills, California · 14922 days ago · 10 km deep · 42 km away
  46. 2.113 km N of Morgan Hill, California · 14921 days ago · 4 km deep · 62 km away
  47. 2.910 km E of Livermore, California · 14920 days ago · 2 km deep · 18 km away
  48. 2.94 km E of Fairview, California · 14920 days ago · 11 km deep · 26 km away
  49. 2.17 km E of East Foothills, California · 14919 days ago · 6 km deep · 47 km away
  50. 1.914 km E of Seven Trees, California · 14919 days ago · 1 km deep · 57 km away
  51. 2.29 km NNE of Livermore, California · 14919 days ago · 13 km deep · 7 km away
  52. 1.614 km E of Seven Trees, California · 14918 days ago · 1 km deep · 57 km away
  53. 1.80 km S of Concord, California · 14916 days ago · 15 km deep · 30 km away
  54. 1.80 km NE of Concord, California · 14916 days ago · 16 km deep · 31 km away
  55. 1.76 km NNE of Blackhawk, California · 14915 days ago · 16 km deep · 13 km away
  56. 3.09 km ENE of Gilroy, California · 14913 days ago · 9 km deep · 88 km away
  57. 1.816 km SSE of Livermore, California · 14913 days ago · 5 km deep · 29 km away
  58. 1.616 km SSE of Livermore, California · 14913 days ago · 5 km deep · 29 km away
  59. 2.48 km NE of Morgan Hill, California · 14913 days ago · 3 km deep · 71 km away
  60. 1.515 km NE of East Foothills, California · 14913 days ago · 8 km deep · 37 km away

The first 60 of 79.

Before

  1. 2.312 km N of Morgan Hill, California · 14961 days ago · 3 km deep · 63 km away
  2. 1.68 km NNE of Interlaken, California · 14961 days ago · 8 km deep · 87 km away
  3. 3.07 km N of Interlaken, California · 14962 days ago · 8 km deep · 87 km away
  4. 1.86 km SSE of Moskowite Corner, California · 14962 days ago · 5 km deep · 74 km away
  5. 1.716 km NE of East Foothills, California · 14962 days ago · 8 km deep · 36 km away
  6. 1.711 km NW of Moskowite Corner, California · 14962 days ago · 4 km deep · 91 km away
  7. 1.68 km NE of San Martin, California · 14963 days ago · 6 km deep · 77 km away
  8. 1.511 km SSW of Brentwood, California · 14965 days ago · 12 km deep · 4 km away
  9. 2.813 km N of Morgan Hill, California · 14966 days ago · 4 km deep · 63 km away
  10. 1.615 km N of Morgan Hill, California · 14967 days ago · 8 km deep · 60 km away
  11. 2.07 km NNE of Interlaken, California · 14968 days ago · 7 km deep · 88 km away
  12. 1.76 km NE of East Foothills, California · 14968 days ago · 9 km deep · 42 km away
  13. 2.84 km NE of San Leandro, California · 14968 days ago · 11 km deep · 32 km away
  14. 1.616 km E of Seven Trees, California · 14969 days ago · 5 km deep · 59 km away
  15. 1.916 km E of Seven Trees, California · 14969 days ago · 6 km deep · 59 km away
  16. 1.62 km E of Rodeo, California · 14969 days ago · 4 km deep · 49 km away
  17. 1.64 km ESE of Moskowite Corner, California · 14970 days ago · 5 km deep · 76 km away
  18. 1.810 km ENE of Blackhawk, California · 14972 days ago · 11 km deep · 5 km away
  19. 2.52 km E of Moskowite Corner, California · 14972 days ago · 4 km deep · 79 km away
  20. 1.82 km E of North Gate, California · 14972 days ago · 12 km deep · 22 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc56396. Read Tue, Sep 22, 2026, 3:25 PM UTC.