California earthquakes

M1.5 earthquake 5 km SSE of Byron, California

A magnitude 1.5 earthquake struck 5 km SSE of Byron, California on Wed, Jul 23, 1986, 8:33 AM PDT (15:33 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.0 16 km E of Seven Trees, 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.

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The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1986-07-23 15:33:35 UTC
Depth
9.8 km (6.1 mi), shallow
Epicenter
37.820° N, 121.620° 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 1.2 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
277°, poorly surrounded by stations
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 68 in the 30 days before it.

After

  1. 2.018 km NE of East Foothills, California · 14680 days ago · 7 km deep · 35 km away
  2. 1.916 km E of Seven Trees, California · 14680 days ago · 4 km deep · 57 km away
  3. 2.610 km ESE of East Foothills, California · 14680 days ago · 8 km deep · 54 km away
  4. 1.618 km NE of East Foothills, California · 14680 days ago · 7 km deep · 35 km away
  5. 2.314 km E of Seven Trees, California · 14679 days ago · 3 km deep · 59 km away
  6. 2.515 km E of Seven Trees, California · 14679 days ago · 3 km deep · 59 km away
  7. 2.019 km NE of East Foothills, California · 14678 days ago · 6 km deep · 35 km away
  8. 1.616 km ESE of Livermore, California · 14678 days ago · 14 km deep · 24 km away
  9. 3.318 km NE of East Foothills, California · 14678 days ago · 8 km deep · 35 km away
  10. 1.71 km W of Portola Valley, California · 14677 days ago · 11 km deep · 74 km away
  11. 1.612 km ENE of East Foothills, California · 14677 days ago · 6 km deep · 44 km away
  12. 2.118 km NE of East Foothills, California · 14676 days ago · 7 km deep · 35 km away
  13. 3.018 km NE of East Foothills, California · 14676 days ago · 8 km deep · 35 km away
  14. 1.926 km W of Volta, California · 14676 days ago · 5 km deep · 92 km away
  15. 1.514 km SSE of Livermore, California · 14676 days ago · 2 km deep · 28 km away
  16. 2.218 km NE of East Foothills, California · 14675 days ago · 6 km deep · 35 km away
  17. 2.211 km NNE of Morgan Hill, California · 14675 days ago · 5 km deep · 65 km away
  18. 1.50 km SSE of North Gate, California · 14674 days ago · 10 km deep · 34 km away
  19. 1.614 km N of Morgan Hill, California · 14674 days ago · 5 km deep · 63 km away
  20. 2.16 km NNE of Interlaken, California · 14674 days ago · 8 km deep · 91 km away
  21. 2.018 km NE of East Foothills, California · 14673 days ago · 6 km deep · 35 km away
  22. 1.618 km NE of East Foothills, California · 14673 days ago · 6 km deep · 35 km away
  23. 2.24 km N of East Foothills, California · 14673 days ago · 2 km deep · 48 km away
  24. 1.718 km SSE of Livermore, California · 14672 days ago · 8 km deep · 33 km away
  25. 1.82 km ESE of Chinatown, California · 14672 days ago · 4 km deep · 67 km away
  26. 1.98 km W of Diablo Grande, California · 14672 days ago · 3 km deep · 53 km away
  27. 1.717 km NE of East Foothills, California · 14672 days ago · 6 km deep · 36 km away
  28. 1.619 km SSE of Livermore, California · 14672 days ago · 6 km deep · 34 km away
  29. 1.712 km NE of East Foothills, California · 14672 days ago · 8 km deep · 41 km away
  30. 2.513 km ENE of East Foothills, California · 14670 days ago · 8 km deep · 44 km away
  31. 1.93 km NE of San Leandro, California · 14670 days ago · 6 km deep · 45 km away
  32. 1.66 km WSW of Gilroy, California · 14669 days ago · 4 km deep · 93 km away
  33. 1.919 km NE of East Foothills, California · 14669 days ago · 6 km deep · 34 km away
  34. 3.46 km NE of East Foothills, California · 14669 days ago · 9 km deep · 46 km away
  35. 2.56 km NE of East Foothills, California · 14669 days ago · 9 km deep · 46 km away
  36. 1.518 km NE of East Foothills, California · 14668 days ago · 6 km deep · 36 km away
  37. 1.518 km NE of East Foothills, California · 14667 days ago · 6 km deep · 35 km away
  38. 1.58 km ESE of East Foothills, California · 14666 days ago · 6 km deep · 52 km away
  39. 2.68 km ESE of East Foothills, California · 14666 days ago · 6 km deep · 52 km away
  40. 2.411 km NNE of East Foothills, California · 14666 days ago · 3 km deep · 41 km away
  41. 1.92 km ESE of Alamo, California · 14665 days ago · 8 km deep · 34 km away
  42. 1.95 km WSW of Gilroy, California · 14664 days ago · 4 km deep · 93 km away
  43. 1.919 km SSE of Livermore, California · 14663 days ago · 7 km deep · 34 km away
  44. 1.815 km SSE of Livermore, California · 14662 days ago · 4 km deep · 29 km away
  45. 1.69 km NNE of Milpitas, California · 14662 days ago · 8 km deep · 41 km away
  46. 1.5Northern California · 14662 days ago · 6 km deep · 35 km away
  47. 1.712 km ENE of East Foothills, California · 14661 days ago · 7 km deep · 44 km away
  48. 1.518 km NE of East Foothills, California · 14661 days ago · 7 km deep · 35 km away
  49. 1.614 km SE of Livermore, California · 14661 days ago · 3 km deep · 28 km away
  50. 1.89 km ESE of East Foothills, California · 14660 days ago · 7 km deep · 53 km away
  51. 1.79 km ESE of East Foothills, California · 14660 days ago · 7 km deep · 53 km away
  52. 2.49 km ESE of East Foothills, California · 14660 days ago · 7 km deep · 53 km away
  53. 2.69 km ESE of East Foothills, California · 14660 days ago · 7 km deep · 53 km away
  54. 1.69 km ESE of East Foothills, California · 14660 days ago · 7 km deep · 53 km away
  55. 2.312 km ESE of East Foothills, California · 14659 days ago · 7 km deep · 55 km away
  56. 1.912 km ESE of East Foothills, California · 14659 days ago · 6 km deep · 55 km away
  57. 1.613 km N of Morgan Hill, California · 14658 days ago · 5 km deep · 64 km away
  58. 1.718 km NE of East Foothills, California · 14658 days ago · 6 km deep · 35 km away
  59. 1.66 km SE of Sunol, California · 14657 days ago · 8 km deep · 35 km away
  60. 1.66 km SE of Sunol, California · 14657 days ago · 8 km deep · 35 km away

The first 60 of 124.

Before

  1. 1.918 km NE of East Foothills, California · 14680 days ago · 7 km deep · 35 km away
  2. 1.58 km S of Byron, California · 14680 days ago · 5 km deep · 4 km away
  3. 1.810 km NNW of Hollister, California · 14681 days ago · 3 km deep · 100 km away
  4. 2.810 km NNW of Hollister, California · 14682 days ago · 2 km deep · 99 km away
  5. 1.612 km NE of East Foothills, California · 14682 days ago · 5 km deep · 40 km away
  6. 2.71 km WSW of Portola Valley, California · 14683 days ago · 10 km deep · 74 km away
  7. 1.73 km S of San Ramon, California · 14684 days ago · 8 km deep · 33 km away
  8. 1.918 km NE of East Foothills, California · 14684 days ago · 7 km deep · 35 km away
  9. 2.114 km WNW of Westley, California · 14685 days ago · 0 km deep · 34 km away
  10. 1.910 km ENE of Blackhawk, California · 14686 days ago · 10 km deep · 15 km away
  11. 1.712 km ENE of East Foothills, California · 14686 days ago · 7 km deep · 44 km away
  12. 1.519 km SSE of Livermore, California · 14686 days ago · 7 km deep · 34 km away
  13. 1.613 km ENE of East Foothills, California · 14686 days ago · 6 km deep · 43 km away
  14. 1.918 km NE of East Foothills, California · 14687 days ago · 7 km deep · 34 km away
  15. 1.64 km S of San Ramon, California · 14687 days ago · 7 km deep · 33 km away
  16. 1.74 km E of South San Francisco, California · 14687 days ago · 10 km deep · 67 km away
  17. 1.613 km ESE of East Foothills, California · 14687 days ago · 3 km deep · 52 km away
  18. 3.015 km E of Seven Trees, California · 14687 days ago · 6 km deep · 60 km away
  19. 2.74 km S of San Ramon, California · 14687 days ago · 8 km deep · 33 km away
  20. 1.519 km SSE of Livermore, California · 14688 days ago · 2 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc77093. Read Thu, Oct 1, 2026, 11:34 PM UTC.