California earthquakes

M1.8 earthquake 1 km NNE of Pacifica, California

A magnitude 1.8 earthquake struck 1 km NNE of Pacifica, California on Tue, Oct 6, 1981, 4:41 AM PDT (11:41 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.1 10 km SSW of Tracy, California. This one was a foreshock.

Pacifica 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
1.8 (md), micro
Local time
UTC
1981-10-06 11:41:09 UTC
Depth
7.0 km (4.4 mi), shallow
Epicenter
37.625° N, 122.482° 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, 0.4 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
169°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 54 in the 60 days after this one and 22 in the 30 days before it.

After

  1. 2.110 km SSW of Tracy, California · 16423 days ago · 9 km deep · 90 km away
  2. 1.76 km NE of East Foothills, California · 16420 days ago · 8 km deep · 67 km away
  3. 2.15 km NNE of San Leandro, California · 16420 days ago · 11 km deep · 35 km away
  4. 1.715 km WNW of Davenport, California · 16420 days ago · 4 km deep · 61 km away
  5. 1.84 km WSW of Kenwood, California · 16419 days ago · 8 km deep · 87 km away
  6. 2.19 km ESE of East Foothills, California · 16416 days ago · 7 km deep · 74 km away
  7. 1.84 km SSE of Dillon Beach, California · 16414 days ago · 2 km deep · 77 km away
  8. 2.010 km N of Pittsburg, California · 16414 days ago · 21 km deep · 77 km away
  9. 2.03 km SSE of Brentwood, California · 16412 days ago · 2 km deep · 77 km away
  10. 2.714 km E of Seven Trees, California · 16408 days ago · 7 km deep · 79 km away
  11. 1.72 km NE of San Leandro, California · 16406 days ago · 3 km deep · 33 km away
  12. 1.87 km SSW of Pescadero, California · 16406 days ago · 14 km deep · 49 km away
  13. 1.715 km NE of Morgan Hill, California · 16406 days ago · 7 km deep · 93 km away
  14. 2.310 km ESE of East Foothills, California · 16405 days ago · 8 km deep · 75 km away
  15. 2.710 km ESE of East Foothills, California · 16405 days ago · 8 km deep · 75 km away
  16. 2.015 km WNW of Davenport, California · 16405 days ago · 1 km deep · 63 km away
  17. 2.32 km S of Fairview, California · 16404 days ago · 6 km deep · 39 km away
  18. 1.712 km SE of Livermore, California · 16404 days ago · 6 km deep · 70 km away
  19. 2.87 km S of Sunol, California · 16403 days ago · 9 km deep · 53 km away
  20. 2.211 km ENE of Blackhawk, California · 16402 days ago · 16 km deep · 66 km away
  21. 2.38 km ESE of East Foothills, California · 16402 days ago · 8 km deep · 73 km away
  22. 1.85 km WNW of Broadmoor, California · 16401 days ago · 7 km deep · 10 km away
  23. 2.02 km E of Ladera, California · 16400 days ago · 4 km deep · 38 km away
  24. 1.62 km SE of Ladera, California · 16400 days ago · 2 km deep · 38 km away
  25. 2.020 km ESE of East Foothills, California · 16398 days ago · 6 km deep · 84 km away
  26. 1.93 km S of Fairview, California · 16397 days ago · 4 km deep · 38 km away
  27. 3.11 km ENE of Pittsburg, California · 16396 days ago · 15 km deep · 70 km away
  28. 2.33 km S of Fairview, California · 16396 days ago · 4 km deep · 38 km away
  29. 1.73 km S of Green Valley, California · 16395 days ago · 9 km deep · 72 km away
  30. 2.28 km ENE of Milpitas, California · 16394 days ago · 7 km deep · 61 km away
  31. 2.27 km E of East Foothills, California · 16392 days ago · 7 km deep · 71 km away
  32. 1.815 km S of Pescadero, California · 16391 days ago · 5 km deep · 58 km away
  33. 2.09 km NE of San Martin, California · 16388 days ago · 8 km deep · 100 km away
  34. 2.33 km SW of Antioch, California · 16387 days ago · 18 km deep · 69 km away
  35. 1.93 km SW of Antioch, California · 16387 days ago · 19 km deep · 69 km away
  36. 1.516 km SE of Livermore, California · 16385 days ago · 9 km deep · 73 km away
  37. 2.312 km SSW of Davenport, California · 16384 days ago · 11 km deep · 83 km away
  38. 1.99 km ESE of Lexington Hills, California · 16382 days ago · 11 km deep · 77 km away
  39. 1.83 km SE of Pacifica, California · 16381 days ago · 9 km deep · 4 km away
  40. 2.14 km NW of Mountain House, California · 16380 days ago · 13 km deep · 81 km away
  41. 2.07 km N of Pittsburg, California · 16380 days ago · 18 km deep · 75 km away
  42. 1.63 km SW of Loyola, California · 16378 days ago · 6 km deep · 45 km away
  43. 1.95 km WSW of Kenwood, California · 16378 days ago · 9 km deep · 86 km away
  44. 1.9Northern California · 16377 days ago · 16 km deep · 67 km away
  45. 1.511 km SW of Brentwood, California · 16376 days ago · 13 km deep · 67 km away
  46. 1.85 km N of San Leandro, California · 16376 days ago · 11 km deep · 32 km away
  47. 1.67 km NE of East Foothills, California · 16374 days ago · 10 km deep · 66 km away
  48. 1.77 km E of East Foothills, California · 16370 days ago · 9 km deep · 71 km away
  49. 2.39 km ESE of East Foothills, California · 16369 days ago · 7 km deep · 74 km away
  50. 1.89 km ESE of East Foothills, California · 16369 days ago · 7 km deep · 74 km away
  51. 1.69 km NE of San Martin, California · 16368 days ago · 8 km deep · 99 km away
  52. 1.65 km NW of Moskowite Corner, California · 16368 days ago · 11 km deep · 97 km away
  53. 1.59 km NE of Morgan Hill, California · 16367 days ago · 5 km deep · 93 km away
  54. 1.93 km WNW of American Canyon, California · 16366 days ago · 6 km deep · 65 km away

Before

  1. 1.86 km SE of Lexington Hills, California · 16423 days ago · 13 km deep · 75 km away
  2. 2.31 km NNE of Pacifica, California · 16423 days ago · 7 km deep · 0 km away
  3. 2.322 km SE of Livermore, California · 16424 days ago · 7 km deep · 81 km away
  4. 1.89 km NE of Milpitas, California · 16425 days ago · 7 km deep · 58 km away
  5. 1.73 km SSW of Oakville, California · 16426 days ago · 6 km deep · 87 km away
  6. 2.93 km ESE of Brentwood, California · 16427 days ago · 9 km deep · 80 km away
  7. 2.39 km ESE of East Foothills, California · 16432 days ago · 8 km deep · 74 km away
  8. 1.85 km E of Fremont, California · 16433 days ago · 9 km deep · 50 km away
  9. 1.88 km ENE of Blackhawk, California · 16435 days ago · 14 km deep · 63 km away
  10. 1.82 km NNE of Woodside, California · 16436 days ago · 5 km deep · 29 km away
  11. 2.03 km SW of Davenport, California · 16437 days ago · 11 km deep · 75 km away
  12. 2.19 km ESE of East Foothills, California · 16438 days ago · 5 km deep · 74 km away
  13. 1.521 km ENE of East Foothills, California · 16438 days ago · 6 km deep · 80 km away
  14. 1.714 km E of Seven Trees, California · 16441 days ago · 4 km deep · 81 km away
  15. 1.75 km WNW of Broadmoor, California · 16442 days ago · 4 km deep · 10 km away
  16. 1.615 km N of Morgan Hill, California · 16443 days ago · 6 km deep · 85 km away
  17. 1.615 km N of Morgan Hill, California · 16443 days ago · 6 km deep · 85 km away
  18. 2.011 km SSW of Loyola, California · 16445 days ago · 9 km deep · 50 km away
  19. 3.09 km NE of San Martin, California · 16447 days ago · 8 km deep · 98 km away
  20. 1.61 km WSW of Belmont, California · 16448 days ago · 3 km deep · 21 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1068341. Read Wed, Sep 23, 2026, 9:50 AM UTC.