California earthquakes

M2.3 earthquake 1 km NW of Concord, California

A magnitude 2.3 earthquake struck 1 km NW of Concord, California on Sun, Sep 11, 1983, 9:31 PM PDT (04:31 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.6 12 km ESE of East Foothills, California. This one was a foreshock.

Concord 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
2.3 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-09-12 04:31:40 UTC
Depth
14.8 km (9.2 mi), shallow
Epicenter
37.990° N, 122.045° 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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
64°
Stations used
36

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 72 in the 60 days after this one and 30 in the 30 days before it.

After

  1. 1.73 km W of Livermore, California · 15724 days ago · 14 km deep · 40 km away
  2. 2.314 km W of Rio Vista, California · 15723 days ago · 15 km deep · 25 km away
  3. 2.36 km SW of Loyola, California · 15720 days ago · 7 km deep · 77 km away
  4. 2.311 km ESE of Hidden Valley Lake, California · 15720 days ago · 4 km deep · 92 km away
  5. 1.82 km SSW of Fairview, California · 15720 days ago · 5 km deep · 37 km away
  6. 2.04 km ESE of Vallejo, California · 15719 days ago · 5 km deep · 18 km away
  7. 1.810 km ENE of Blackhawk, California · 15718 days ago · 3 km deep · 26 km away
  8. 1.813 km ESE of Hidden Valley Lake, California · 15718 days ago · -1 km deep · 90 km away
  9. 2.09 km SE of Suisun, California · 15718 days ago · 5 km deep · 23 km away
  10. 2.612 km SE of Suisun, California · 15718 days ago · 19 km deep · 21 km away
  11. 2.76 km N of San Leandro, California · 15717 days ago · 10 km deep · 25 km away
  12. 2.513 km E of Seven Trees, California · 15717 days ago · 3 km deep · 84 km away
  13. 2.13 km E of Berkeley, California · 15716 days ago · 10 km deep · 21 km away
  14. 2.53 km E of Berkeley, California · 15716 days ago · 10 km deep · 21 km away
  15. 2.06 km SSE of Byron, California · 15716 days ago · 12 km deep · 43 km away
  16. 1.93 km NE of Santa Rosa, California · 15714 days ago · 8 km deep · 77 km away
  17. 1.610 km WSW of Brentwood, California · 15713 days ago · 9 km deep · 23 km away
  18. 1.85 km WSW of Cupertino, California · 15713 days ago · 5 km deep · 77 km away
  19. 1.54 km WSW of Cupertino, California · 15713 days ago · 5 km deep · 77 km away
  20. 2.111 km E of Blackhawk, California · 15713 days ago · 12 km deep · 29 km away
  21. 1.91 km NE of Pittsburg, California · 15713 days ago · 17 km deep · 16 km away
  22. 2.021 km SW of Diablo Grande, California · 15713 days ago · 0 km deep · 93 km away
  23. 2.02 km E of Pacifica, California · 15712 days ago · 8 km deep · 56 km away
  24. 2.92 km NNE of Piedmont, California · 15710 days ago · 5 km deep · 22 km away
  25. 1.61 km ESE of North Gate, California · 15710 days ago · 11 km deep · 11 km away
  26. 2.02 km N of Piedmont, California · 15709 days ago · 3 km deep · 23 km away
  27. 1.99 km ESE of East Foothills, California · 15708 days ago · 0 km deep · 78 km away
  28. 1.81 km NW of Larkfield-Wikiup, California · 15706 days ago · 0 km deep · 86 km away
  29. 1.514 km SSE of Livermore, California · 15704 days ago · 8 km deep · 57 km away
  30. 1.72 km ESE of Larkfield-Wikiup, California · 15702 days ago · 2 km deep · 82 km away
  31. 2.23 km NE of Green Valley, California · 15702 days ago · 10 km deep · 33 km away
  32. 2.58 km NE of Morgan Hill, California · 15700 days ago · 3 km deep · 99 km away
  33. 1.57 km NE of Livermore, California · 15697 days ago · 9 km deep · 43 km away
  34. 1.88 km ENE of Livermore, California · 15697 days ago · 8 km deep · 43 km away
  35. 3.17 km E of East Foothills, California · 15697 days ago · 8 km deep · 74 km away
  36. 2.67 km E of East Foothills, California · 15697 days ago · 8 km deep · 74 km away
  37. 2.74 km SSE of Dunnigan, California · 15697 days ago · 0 km deep · 96 km away
  38. 3.012 km WSW of Byron, California · 15697 days ago · 12 km deep · 32 km away
  39. 2.314 km S of Mountain House, California · 15695 days ago · 9 km deep · 56 km away
  40. 1.910 km SSE of Muir Beach, California · 15694 days ago · 11 km deep · 51 km away
  41. 1.77 km WNW of Broadmoor, California · 15694 days ago · 6 km deep · 54 km away
  42. 2.12 km S of Diablo, California · 15694 days ago · 7 km deep · 21 km away
  43. 2.111 km NNE of Livermore, California · 15691 days ago · 13 km deep · 35 km away
  44. 1.613 km NW of Moskowite Corner, California · 15690 days ago · 9 km deep · 65 km away
  45. 2.00 km NNW of Visitacion Valley, California · 15690 days ago · 7 km deep · 44 km away
  46. 1.73 km E of Vine Hill, California · 15689 days ago · 8 km deep · 3 km away
  47. 1.93 km NE of Fremont, California · 15689 days ago · 4 km deep · 47 km away
  48. 1.814 km E of Seven Trees, California · 15688 days ago · 7 km deep · 82 km away
  49. 1.84 km ESE of South San Francisco, California · 15687 days ago · 7 km deep · 48 km away
  50. 1.55 km NE of Black Point-Green Point, California · 15687 days ago · 5 km deep · 42 km away
  51. 3.612 km ESE of East Foothills, California · 15684 days ago · 7 km deep · 80 km away
  52. 2.23 km W of Livermore, California · 15684 days ago · 14 km deep · 41 km away
  53. 2.43 km W of Livermore, California · 15684 days ago · 16 km deep · 40 km away
  54. 1.68 km NE of Milpitas, California · 15684 days ago · 6 km deep · 59 km away
  55. 2.03 km NNE of Santa Rosa, California · 15684 days ago · 7 km deep · 78 km away
  56. 1.91 km WSW of Dublin, California · 15684 days ago · 8 km deep · 34 km away
  57. 1.71 km WSW of Dublin, California · 15684 days ago · 8 km deep · 34 km away
  58. 1.614 km E of Seven Trees, California · 15679 days ago · 2 km deep · 84 km away
  59. 1.84 km SE of North Gate, California · 15678 days ago · 11 km deep · 14 km away
  60. 1.75 km NE of Black Point-Green Point, California · 15676 days ago · 6 km deep · 41 km away

The first 60 of 72.

Before

  1. 1.81 km SW of Hillsborough, California · 15726 days ago · 7 km deep · 56 km away
  2. 1.90 km N of Kensington, California · 15726 days ago · 6 km deep · 22 km away
  3. 1.510 km ESE of Hidden Valley Lake, California · 15726 days ago · 6 km deep · 93 km away
  4. 1.89 km S of Moskowite Corner, California · 15727 days ago · 7 km deep · 43 km away
  5. 3.216 km N of Morgan Hill, California · 15728 days ago · 9 km deep · 87 km away
  6. 1.63 km NNW of Clyde, California · 15728 days ago · 2 km deep · 7 km away
  7. 3.03 km W of Livermore, California · 15729 days ago · 16 km deep · 40 km away
  8. 2.110 km E of Blackhawk, California · 15732 days ago · 5 km deep · 28 km away
  9. 1.714 km E of Seven Trees, California · 15732 days ago · 2 km deep · 84 km away
  10. 2.03 km ENE of Fremont, California · 15733 days ago · 5 km deep · 49 km away
  11. 2.01 km ENE of Middletown, California · 15735 days ago · 55 km deep · 98 km away
  12. 1.7Northern California · 15736 days ago · 13 km deep · 32 km away
  13. 1.69 km ENE of Milpitas, California · 15737 days ago · 7 km deep · 61 km away
  14. 2.12 km SSW of Pittsburg, California · 15738 days ago · 16 km deep · 13 km away
  15. 2.31 km NNE of Diablo, California · 15738 days ago · 9 km deep · 18 km away
  16. 2.118 km ESE of Livermore, California · 15742 days ago · 4 km deep · 60 km away
  17. 1.75 km SW of Oakville, California · 15743 days ago · 4 km deep · 58 km away
  18. 1.67 km E of East Foothills, CA · 15744 days ago · 7 km deep · 72 km away
  19. 1.612 km ESE of East Foothills, California · 15746 days ago · 4 km deep · 81 km away
  20. 1.912 km N of Livermore, California · 15748 days ago · 11 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1102549. Read Thu, Oct 1, 2026, 1:20 PM UTC.