California earthquakes

M2.1 earthquake 0 km W of Concord, California

A magnitude 2.1 earthquake struck 0 km W of Concord, California on Thu, Mar 4, 1982, 4:07 AM PST (12:07 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M3.1 11 km E of Blackhawk, 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
2.1 (md), micro
Local time
UTC
1982-03-04 12:07:15 UTC
Depth
14.5 km (9.0 mi), shallow
Epicenter
37.978° N, 122.040° 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
±0.17
Depth from
From location
Station coverage gap
54°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 1.77 km SSE of Livermore, California · 16279 days ago · 17 km deep · 48 km away
  2. 1.64 km NNE of Fremont, California · 16279 days ago · 8 km deep · 44 km away
  3. 2.12 km SSW of Sunol, California · 16277 days ago · 11 km deep · 47 km away
  4. 1.82 km WNW of Fremont, California · 16275 days ago · 7 km deep · 47 km away
  5. 2.23 km WSW of Cupertino, California · 16275 days ago · 4 km deep · 74 km away
  6. 2.41 km E of Piedmont, California · 16273 days ago · 13 km deep · 23 km away
  7. 2.08 km ESE of East Foothills, California · 16271 days ago · 8 km deep · 75 km away
  8. 2.58 km ESE of East Foothills, California · 16271 days ago · 8 km deep · 74 km away
  9. 2.2Northern California · 16271 days ago · 9 km deep · 54 km away
  10. 1.57 km NE of Milpitas, California · 16271 days ago · 39 km deep · 59 km away
  11. 2.36 km ENE of Santa Rosa, California · 16270 days ago · 6 km deep · 77 km away
  12. 1.98 km ENE of Milpitas, California · 16268 days ago · 6 km deep · 60 km away
  13. 2.114 km E of Seven Trees, California · 16268 days ago · 2 km deep · 83 km away
  14. 1.611 km N of Morgan Hill, California · 16265 days ago · 7 km deep · 90 km away
  15. 1.911 km SSE of Elmira, California · 16264 days ago · 16 km deep · 34 km away
  16. 2.020 km NNE of Morgan Hill, California · 16264 days ago · 7 km deep · 84 km away
  17. 1.70 km ENE of San Ramon, California · 16263 days ago · 1 km deep · 23 km away
  18. 1.52 km E of San Ramon, California · 16263 days ago · 8 km deep · 23 km away
  19. 2.02 km E of San Ramon, California · 16263 days ago · 6 km deep · 23 km away
  20. 1.92 km E of San Ramon, California · 16263 days ago · 6 km deep · 23 km away
  21. 1.61 km E of San Ramon, California · 16263 days ago · 7 km deep · 23 km away
  22. 1.63 km SSE of Portola Valley, California · 16263 days ago · 10 km deep · 71 km away
  23. 1.61 km E of San Ramon, California · 16263 days ago · 7 km deep · 23 km away
  24. 2.61 km E of San Ramon, California · 16263 days ago · 7 km deep · 23 km away
  25. 2.117 km NE of East Foothills, California · 16263 days ago · 7 km deep · 61 km away
  26. 1.61 km E of San Ramon, California · 16262 days ago · 7 km deep · 23 km away
  27. 2.11 km E of San Ramon, California · 16262 days ago · 5 km deep · 23 km away
  28. 2.11 km E of San Ramon, California · 16262 days ago · 7 km deep · 23 km away
  29. 1.92 km E of San Ramon, California · 16262 days ago · 8 km deep · 23 km away
  30. 3.06 km NE of Santa Rosa, California · 16262 days ago · 8 km deep · 77 km away
  31. 1.85 km SE of Santa Rosa, California · 16261 days ago · 9 km deep · 73 km away
  32. 1.62 km E of San Ramon, California · 16260 days ago · 7 km deep · 23 km away
  33. 3.03 km ESE of Piedmont, California · 16259 days ago · 5 km deep · 23 km away
  34. 1.94 km E of Piedmont, California · 16259 days ago · 4 km deep · 22 km away
  35. 2.75 km N of Morgan Hill, California · 16259 days ago · 6 km deep · 95 km away
  36. 2.73 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 23 km away
  37. 2.73 km ESE of Piedmont, California · 16259 days ago · 5 km deep · 23 km away
  38. 1.92 km ESE of Piedmont, California · 16259 days ago · 3 km deep · 23 km away
  39. 1.73 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 23 km away
  40. 1.53 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 23 km away
  41. 1.92 km ESE of Piedmont, California · 16259 days ago · 6 km deep · 23 km away
  42. 2.22 km E of San Ramon, California · 16258 days ago · 7 km deep · 23 km away
  43. 3.13 km ESE of Piedmont, California · 16257 days ago · 4 km deep · 23 km away
  44. 2.33 km ESE of Piedmont, California · 16257 days ago · 4 km deep · 22 km away
  45. 1.63 km E of Santa Rosa, California · 16256 days ago · 8 km deep · 76 km away
  46. 3.111 km E of Blackhawk, California · 16256 days ago · 17 km deep · 28 km away
  47. 3.111 km SW of Brentwood, California · 16256 days ago · 18 km deep · 28 km away
  48. 2.011 km ENE of Blackhawk, California · 16256 days ago · 18 km deep · 27 km away
  49. 2.12 km NE of Piedmont, California · 16256 days ago · 11 km deep · 22 km away
  50. 1.611 km SW of Brentwood, California · 16255 days ago · 19 km deep · 27 km away
  51. 2.03 km E of Discovery Bay, California · 16255 days ago · 3 km deep · 43 km away
  52. 2.39 km ESE of East Foothills, California · 16254 days ago · 7 km deep · 75 km away
  53. 2.42 km ESE of Piedmont, California · 16253 days ago · 4 km deep · 23 km away
  54. 1.66 km E of East Foothills, California · 16253 days ago · 5 km deep · 72 km away
  55. 1.52 km WNW of San Jose, California · 16252 days ago · 12 km deep · 71 km away
  56. 2.61 km ENE of San Ramon, California · 16251 days ago · 8 km deep · 23 km away
  57. 1.61 km ENE of San Ramon, California · 16251 days ago · 8 km deep · 22 km away
  58. 2.73 km ESE of Piedmont, California · 16251 days ago · 4 km deep · 23 km away
  59. 1.91 km E of San Ramon, California · 16251 days ago · 7 km deep · 23 km away
  60. 1.75 km ENE of Rohnert Park, California · 16249 days ago · 7 km deep · 67 km away

The first 60 of 101.

Before

  1. 1.99 km S of Muir Beach, California · 16284 days ago · 2 km deep · 52 km away
  2. 1.89 km NNE of Morgan Hill, California · 16287 days ago · 4 km deep · 95 km away
  3. 1.82 km NW of Muir Beach, California · 16288 days ago · 3 km deep · 50 km away
  4. 2.315 km E of Seven Trees, California · 16288 days ago · 5 km deep · 83 km away
  5. 1.515 km N of Morgan Hill, California · 16290 days ago · 5 km deep · 86 km away
  6. 2.07 km ESE of East Foothills, California · 16291 days ago · 5 km deep · 73 km away
  7. 1.8Northern California · 16291 days ago · 5 km deep · 81 km away
  8. 1.65 km WSW of Glen Ellen, California · 16292 days ago · 7 km deep · 62 km away
  9. 1.72 km WSW of Oakley, California · 16292 days ago · 9 km deep · 27 km away
  10. 2.01 km SE of Diablo, California · 16292 days ago · 8 km deep · 19 km away
  11. 1.6Northern California · 16292 days ago · 11 km deep · 19 km away
  12. 1.65 km SSW of Antioch, California · 16292 days ago · 11 km deep · 19 km away
  13. 1.81 km SE of Occidental, California · 16293 days ago · 6 km deep · 91 km away
  14. 2.05 km N of Windsor, California · 16295 days ago · 7 km deep · 96 km away
  15. 1.95 km S of Calistoga, California · 16295 days ago · 2 km deep · 78 km away
  16. 1.65 km SE of Santa Rosa, California · 16296 days ago · 8 km deep · 72 km away
  17. 1.58 km NNE of Milpitas, California · 16296 days ago · 3 km deep · 56 km away
  18. 2.14 km SE of Pittsburg, California · 16296 days ago · 18 km deep · 17 km away
  19. 2.27 km E of East Foothills, California · 16299 days ago · 6 km deep · 72 km away
  20. 2.27 km E of East Foothills, California · 16299 days ago · 6 km deep · 73 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1072636. Read Wed, Sep 30, 2026, 10:53 PM UTC.