California earthquakes

M1.6 earthquake 2 km ENE of Pacheco, California

A magnitude 1.6 earthquake struck 2 km ENE of Pacheco, California on Thu, Mar 5, 1981, 6:26 AM PST (14:26 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M4.1 8 km N of Day Valley, California. This one was a foreshock.

Pacheco 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1981-03-05 14:26:59 UTC
Depth
14.9 km (9.3 mi), shallow
Epicenter
37.993° N, 122.051° 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, 0.8 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
50°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 56 in the 60 days after this one and 63 in the 30 days before it.

After

  1. 1.64 km E of Fremont, California · 16645 days ago · 8 km deep · 50 km away
  2. 2.714 km E of Seven Trees, California · 16643 days ago · 7 km deep · 83 km away
  3. 1.82 km SSW of Pittsburg, California · 16641 days ago · 18 km deep · 13 km away
  4. 1.75 km E of Fremont, California · 16638 days ago · 5 km deep · 51 km away
  5. 1.813 km N of Morgan Hill, California · 16637 days ago · 6 km deep · 90 km away
  6. 1.75 km E of Fremont, California · 16637 days ago · 9 km deep · 51 km away
  7. 2.17 km NNE of Milpitas, California · 16637 days ago · 0 km deep · 58 km away
  8. 1.69 km ESE of East Foothills, California · 16637 days ago · 8 km deep · 77 km away
  9. 1.73 km N of Piedmont, California · 16637 days ago · 11 km deep · 22 km away
  10. 3.19 km SW of Brentwood, California · 16636 days ago · 16 km deep · 29 km away
  11. 2.314 km E of Seven Trees, California · 16634 days ago · 2 km deep · 84 km away
  12. 2.29 km ENE of Hidden Valley Lake, California · 16633 days ago · 8 km deep · 100 km away
  13. 1.610 km E of Hidden Valley Lake, California · 16633 days ago · 7 km deep · 98 km away
  14. 1.614 km E of Seven Trees, California · 16632 days ago · 1 km deep · 85 km away
  15. 1.611 km E of Blackhawk, California · 16631 days ago · 11 km deep · 31 km away
  16. 1.64 km NW of Dublin, California · 16630 days ago · 7 km deep · 30 km away
  17. 2.115 km E of Seven Trees, California · 16629 days ago · 3 km deep · 85 km away
  18. 2.314 km E of Seven Trees, California · 16629 days ago · 4 km deep · 85 km away
  19. 2.69 km E of Hidden Valley Lake, California · 16629 days ago · 11 km deep · 96 km away
  20. 2.37 km E of East Foothills, California · 16628 days ago · 8 km deep · 75 km away
  21. 2.23 km NNW of Castro Valley, California · 16627 days ago · 10 km deep · 30 km away
  22. 2.06 km ESE of Roseland, California · 16626 days ago · 8 km deep · 70 km away
  23. 3.114 km SSE of Livermore, California · 16626 days ago · 2 km deep · 57 km away
  24. 1.713 km N of Morgan Hill, California · 16626 days ago · 6 km deep · 90 km away
  25. 1.614 km SSE of Livermore, California · 16625 days ago · 2 km deep · 57 km away
  26. 1.515 km SSE of Livermore, California · 16623 days ago · 2 km deep · 58 km away
  27. 2.18 km ENE of Hidden Valley Lake, California · 16621 days ago · 7 km deep · 99 km away
  28. 2.38 km ENE of Hidden Valley Lake, California · 16620 days ago · 8 km deep · 99 km away
  29. 1.96 km S of Sunol, California · 16618 days ago · 9 km deep · 53 km away
  30. 1.616 km SSE of Livermore, California · 16615 days ago · -1 km deep · 59 km away
  31. 1.74 km W of Westley, California · 16614 days ago · 8 km deep · 86 km away
  32. 1.58 km E of East Foothills, California · 16614 days ago · 8 km deep · 75 km away
  33. 1.53 km WSW of Campbell, California · 16614 days ago · 4 km deep · 80 km away
  34. 1.53 km NNE of Pleasanton, California · 16613 days ago · 14 km deep · 37 km away
  35. 1.912 km N of Livermore, California · 16613 days ago · 10 km deep · 34 km away
  36. 1.74 km NE of Blackhawk, California · 16610 days ago · 5 km deep · 23 km away
  37. 3.410 km NNE of Livermore, California · 16609 days ago · 13 km deep · 38 km away
  38. 1.814 km E of Seven Trees, California · 16609 days ago · 1 km deep · 84 km away
  39. 1.60 km W of Moskowite Corner, California · 16607 days ago · 16 km deep · 52 km away
  40. 1.822 km SE of Livermore, California · 16606 days ago · 2 km deep · 65 km away
  41. 1.78 km ESE of Blackhawk, California · 16600 days ago · 7 km deep · 30 km away
  42. 1.97 km SE of Sunol, California · 16598 days ago · 5 km deep · 53 km away
  43. 1.611 km NE of Healdsburg, California · 16598 days ago · 5 km deep · 97 km away
  44. 1.72 km NW of Orinda, California · 16598 days ago · 11 km deep · 17 km away
  45. 1.82 km NNW of Brentwood, California · 16596 days ago · 0 km deep · 30 km away
  46. 1.68 km SSW of Antioch, California · 16596 days ago · 0 km deep · 21 km away
  47. 1.67 km NNE of East Foothills, California · 16595 days ago · 11 km deep · 67 km away
  48. 4.18 km N of Day Valley, California · 16595 days ago · 13 km deep · 99 km away
  49. 2.18 km E of Hidden Valley Lake, California · 16594 days ago · 7 km deep · 96 km away
  50. 2.616 km N of Morgan Hill, California · 16593 days ago · 6 km deep · 87 km away
  51. 1.77 km W of Mountain House, California · 16591 days ago · 9 km deep · 44 km away
  52. 1.69 km ESE of East Foothills, California · 16591 days ago · 8 km deep · 77 km away
  53. 2.29 km ESE of East Foothills, California · 16591 days ago · 8 km deep · 76 km away
  54. 1.612 km S of Guinda, California · 16589 days ago · 4 km deep · 81 km away
  55. 2.03 km SW of Broadmoor, California · 16587 days ago · 7 km deep · 54 km away
  56. 1.66 km WSW of Pescadero, California · 16586 days ago · 6 km deep · 92 km away

Before

  1. 1.66 km ENE of East Foothills, California · 16647 days ago · 4 km deep · 70 km away
  2. 1.85 km E of Fremont, California · 16647 days ago · 10 km deep · 50 km away
  3. 1.94 km E of Fremont, California · 16647 days ago · 10 km deep · 50 km away
  4. 1.64 km E of Fremont, California · 16648 days ago · 8 km deep · 50 km away
  5. 2.39 km NNE of Livermore, California · 16648 days ago · 13 km deep · 40 km away
  6. 1.85 km SSW of Sunol, California · 16648 days ago · 11 km deep · 50 km away
  7. 1.84 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  8. 1.65 km E of Fremont, California · 16648 days ago · 10 km deep · 50 km away
  9. 1.74 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  10. 2.05 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  11. 1.73 km E of Fremont, California · 16648 days ago · 8 km deep · 50 km away
  12. 1.85 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  13. 1.75 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  14. 2.15 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  15. 1.86 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  16. 1.65 km E of Fremont, California · 16648 days ago · 6 km deep · 51 km away
  17. 1.64 km E of Fremont, California · 16648 days ago · 14 km deep · 51 km away
  18. 2.45 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  19. 1.65 km E of Fremont, California · 16648 days ago · 9 km deep · 51 km away
  20. 1.74 km E of Fremont, California · 16648 days ago · 8 km deep · 50 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1061044. Read Thu, Oct 1, 2026, 3:10 PM UTC.