California earthquakes

M1.7 earthquake 5 km WNW of Broadmoor, California

A magnitude 1.7 earthquake struck 5 km WNW of Broadmoor, California on Thu, Sep 17, 1981, 1:29 AM PDT (08:29 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M1.7 14 km E of Seven Trees, California. This one was a foreshock.

Broadmoor 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
1.7 (md), micro
Local time
UTC
1981-09-17 08:29:20 UTC
Depth
4.2 km (2.6 mi), shallow
Epicenter
37.707° N, 122.534° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
166°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 24 in the 30 days before it.

After

  1. 1.714 km E of Seven Trees, California · 16440 days ago · 4 km deep · 89 km away
  2. 1.521 km ENE of East Foothills, California · 16438 days ago · 6 km deep · 86 km away
  3. 2.19 km ESE of East Foothills, California · 16438 days ago · 5 km deep · 82 km away
  4. 2.03 km SW of Davenport, California · 16437 days ago · 11 km deep · 85 km away
  5. 1.714 km NNW of Moskowite Corner, California · 16436 days ago · 0 km deep · 97 km away
  6. 1.82 km NNE of Woodside, California · 16436 days ago · 5 km deep · 39 km away
  7. 1.88 km ENE of Blackhawk, California · 16435 days ago · 14 km deep · 65 km away
  8. 1.85 km E of Fremont, California · 16432 days ago · 9 km deep · 56 km away
  9. 2.39 km ESE of East Foothills, California · 16432 days ago · 8 km deep · 83 km away
  10. 2.93 km ESE of Brentwood, California · 16427 days ago · 9 km deep · 81 km away
  11. 1.73 km SSW of Oakville, California · 16426 days ago · 6 km deep · 79 km away
  12. 1.89 km NE of Milpitas, California · 16425 days ago · 7 km deep · 65 km away
  13. 2.322 km SE of Livermore, California · 16423 days ago · 7 km deep · 87 km away
  14. 2.31 km NNE of Pacifica, California · 16423 days ago · 7 km deep · 10 km away
  15. 1.86 km SE of Lexington Hills, California · 16423 days ago · 13 km deep · 85 km away
  16. 1.81 km NNE of Pacifica, California · 16422 days ago · 7 km deep · 10 km away
  17. 2.110 km SSW of Tracy, California · 16422 days ago · 9 km deep · 95 km away
  18. 1.76 km NE of East Foothills, California · 16420 days ago · 8 km deep · 75 km away
  19. 2.15 km NNE of San Leandro, California · 16420 days ago · 11 km deep · 36 km away
  20. 1.715 km WNW of Davenport, California · 16419 days ago · 4 km deep · 71 km away
  21. 1.84 km WSW of Kenwood, California · 16419 days ago · 8 km deep · 77 km away
  22. 2.19 km ESE of East Foothills, California · 16416 days ago · 7 km deep · 83 km away
  23. 1.84 km SSE of Dillon Beach, California · 16414 days ago · 2 km deep · 67 km away
  24. 1.62 km E of Larkfield-Wikiup, California · 16414 days ago · 8 km deep · 91 km away
  25. 2.010 km N of Pittsburg, California · 16414 days ago · 21 km deep · 74 km away
  26. 2.03 km SSE of Brentwood, California · 16411 days ago · 2 km deep · 78 km away
  27. 2.714 km E of Seven Trees, California · 16407 days ago · 7 km deep · 87 km away
  28. 1.72 km NE of San Leandro, California · 16406 days ago · 3 km deep · 35 km away
  29. 1.87 km SSW of Pescadero, California · 16405 days ago · 14 km deep · 59 km away
  30. 2.310 km ESE of East Foothills, California · 16405 days ago · 8 km deep · 83 km away
  31. 2.710 km ESE of East Foothills, California · 16405 days ago · 8 km deep · 83 km away
  32. 2.015 km WNW of Davenport, California · 16404 days ago · 1 km deep · 72 km away
  33. 2.32 km S of Fairview, California · 16403 days ago · 6 km deep · 43 km away
  34. 1.712 km SE of Livermore, California · 16403 days ago · 6 km deep · 76 km away
  35. 2.87 km S of Sunol, California · 16403 days ago · 9 km deep · 60 km away
  36. 2.211 km ENE of Blackhawk, California · 16402 days ago · 16 km deep · 68 km away
  37. 2.38 km ESE of East Foothills, California · 16402 days ago · 8 km deep · 82 km away
  38. 1.85 km WNW of Broadmoor, California · 16401 days ago · 7 km deep · 1 km away
  39. 2.02 km E of Ladera, California · 16400 days ago · 4 km deep · 47 km away
  40. 1.62 km SE of Ladera, California · 16400 days ago · 2 km deep · 48 km away
  41. 2.020 km ESE of East Foothills, California · 16397 days ago · 6 km deep · 92 km away
  42. 1.93 km S of Fairview, California · 16396 days ago · 4 km deep · 43 km away
  43. 3.11 km ENE of Pittsburg, California · 16395 days ago · 15 km deep · 68 km away
  44. 2.33 km S of Fairview, California · 16395 days ago · 4 km deep · 43 km away
  45. 1.73 km S of Green Valley, California · 16395 days ago · 9 km deep · 66 km away
  46. 2.28 km ENE of Milpitas, California · 16393 days ago · 7 km deep · 69 km away
  47. 2.27 km E of East Foothills, California · 16391 days ago · 7 km deep · 79 km away
  48. 1.815 km S of Pescadero, California · 16391 days ago · 5 km deep · 67 km away
  49. 2.33 km SW of Antioch, California · 16386 days ago · 18 km deep · 69 km away
  50. 1.93 km SW of Antioch, California · 16386 days ago · 19 km deep · 69 km away
  51. 1.73 km W of Forestville, California · 16385 days ago · 0 km deep · 92 km away
  52. 1.516 km SE of Livermore, California · 16384 days ago · 9 km deep · 79 km away
  53. 2.312 km SSW of Davenport, California · 16383 days ago · 11 km deep · 93 km away

Before

  1. 1.615 km N of Morgan Hill, California · 16442 days ago · 6 km deep · 93 km away
  2. 1.615 km N of Morgan Hill, California · 16442 days ago · 6 km deep · 93 km away
  3. 2.011 km SSW of Loyola, California · 16444 days ago · 9 km deep · 60 km away
  4. 1.61 km WSW of Belmont, California · 16447 days ago · 3 km deep · 30 km away
  5. 1.611 km SSW of Loyola, California · 16452 days ago · 10 km deep · 60 km away
  6. 1.611 km ENE of Milpitas, California · 16455 days ago · 4 km deep · 69 km away
  7. 1.518 km ESE of East Foothills, California · 16455 days ago · 1 km deep · 92 km away
  8. 1.65 km E of Fremont, California · 16456 days ago · 10 km deep · 56 km away
  9. 1.74 km N of Milpitas, California · 16456 days ago · 3 km deep · 61 km away
  10. 2.06 km S of Sunol, California · 16457 days ago · 9 km deep · 60 km away
  11. 1.65 km E of Fremont, California · 16458 days ago · 9 km deep · 56 km away
  12. 2.412 km N of Livermore, California · 16460 days ago · 12 km deep · 69 km away
  13. 2.12 km E of San Leandro, California · 16460 days ago · 5 km deep · 36 km away
  14. 2.37 km E of East Foothills, California · 16461 days ago · 6 km deep · 80 km away
  15. 2.111 km E of Blackhawk, California · 16462 days ago · 14 km deep · 68 km away
  16. 1.814 km E of Seven Trees, California · 16462 days ago · 2 km deep · 89 km away
  17. 3.011 km SW of Brentwood, California · 16462 days ago · 16 km deep · 69 km away
  18. 1.71 km NW of Larkfield-Wikiup, California · 16463 days ago · 1 km deep · 93 km away
  19. 2.122 km SE of Livermore, California · 16463 days ago · 6 km deep · 87 km away
  20. 1.815 km E of Seven Trees, California · 16463 days ago · 3 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1067719. Read Tue, Sep 22, 2026, 8:47 PM UTC.