California earthquakes

M2.1 earthquake 0 km E of Concord, California

A magnitude 2.1 earthquake struck 0 km E of Concord, California on Tue, Jul 23, 2002, 1:28 PM PDT (20:28 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.0 1 km SE of Diablo, 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, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2002-07-23 20:28:54 UTC
Depth
12.7 km (7.9 mi), shallow
Epicenter
37.979° N, 122.022° 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, 0.2 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
112°
Stations used
57

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 91 in the 60 days after this one and 61 in the 30 days before it.

After

  1. 1.88 km SE of Knights Landing, California · 8839 days ago · 13 km deep · 92 km away
  2. 1.52 km NE of San Ramon, California · 8838 days ago · 7 km deep · 22 km away
  3. 1.72 km NE of San Ramon, California · 8837 days ago · 8 km deep · 21 km away
  4. 1.94 km SE of Piedmont, California · 8837 days ago · 12 km deep · 26 km away
  5. 1.77 km E of East Foothills, California · 8837 days ago · 5 km deep · 72 km away
  6. 1.81 km NE of San Ramon, California · 8837 days ago · 7 km deep · 22 km away
  7. 1.91 km NE of San Ramon, California · 8837 days ago · 7 km deep · 22 km away
  8. 1.71 km NE of San Ramon, California · 8836 days ago · 7 km deep · 22 km away
  9. 1.92 km NE of San Ramon, California · 8836 days ago · 7 km deep · 21 km away
  10. 1.72 km NE of San Ramon, California · 8836 days ago · 8 km deep · 21 km away
  11. 1.72 km NE of San Ramon, California · 8836 days ago · 7 km deep · 22 km away
  12. 1.62 km NE of San Ramon, California · 8836 days ago · 7 km deep · 21 km away
  13. 1.5Northern California · 8836 days ago · 6 km deep · 22 km away
  14. 1.75 km WSW of Broadmoor, California · 8836 days ago · 7 km deep · 57 km away
  15. 1.79 km ESE of Livermore, California · 8835 days ago · 1 km deep · 48 km away
  16. 1.65 km ESE of San Ramon, California · 8834 days ago · 7 km deep · 26 km away
  17. 1.61 km NW of Larkfield-Wikiup, California · 8833 days ago · 1 km deep · 88 km away
  18. 1.88 km SSE of Knights Landing, California · 8833 days ago · 10 km deep · 89 km away
  19. 1.67 km E of East Foothills, California · 8832 days ago · 6 km deep · 72 km away
  20. 1.54 km WSW of Highlands-Baywood Park, California · 8832 days ago · 2 km deep · 62 km away
  21. 1.76 km S of Calistoga, California · 8830 days ago · 5 km deep · 78 km away
  22. 2.06 km NNE of Milpitas, California · 8830 days ago · 0 km deep · 57 km away
  23. 1.61 km NE of Pacifica, California · 8829 days ago · 7 km deep · 56 km away
  24. 1.615 km E of Seven Trees, California · 8826 days ago · 2 km deep · 83 km away
  25. 1.74 km S of Diablo Grande, California · 8826 days ago · 7 km deep · 95 km away
  26. 1.97 km E of East Foothills, California · 8825 days ago · 7 km deep · 73 km away
  27. 1.93 km N of East Foothills, California · 8824 days ago · 1 km deep · 66 km away
  28. 2.113 km E of Angwin, California · 8821 days ago · 1 km deep · 70 km away
  29. 1.75 km E of Alameda, California · 8819 days ago · 11 km deep · 27 km away
  30. 1.85 km NNE of Milpitas, California · 8819 days ago · 0 km deep · 58 km away
  31. 2.13 km NE of Graton, California · 8819 days ago · 5 km deep · 89 km away
  32. 1.69 km S of Muir Beach, California · 8817 days ago · 9 km deep · 53 km away
  33. 2.66 km N of Pittsburg, California · 8816 days ago · 20 km deep · 18 km away
  34. 1.511 km SSE of Livermore, California · 8816 days ago · 6 km deep · 51 km away
  35. 2.02 km NNW of Benicia, California · 8816 days ago · 8 km deep · 17 km away
  36. 1.8Northern California · 8814 days ago · 8 km deep · 90 km away
  37. 1.812 km ESE of East Foothills, California · 8812 days ago · 5 km deep · 79 km away
  38. 2.01 km SSE of Diablo, California · 8811 days ago · 14 km deep · 19 km away
  39. 1.71 km S of Diablo, California · 8810 days ago · 16 km deep · 19 km away
  40. 2.48 km N of East Foothills, California · 8810 days ago · 6 km deep · 61 km away
  41. 1.62 km S of Diablo, California · 8810 days ago · 13 km deep · 20 km away
  42. 1.811 km ESE of East Foothills, California · 8810 days ago · 6 km deep · 77 km away
  43. 1.91 km SE of Diablo, California · 8810 days ago · 15 km deep · 19 km away
  44. 3.01 km SE of Diablo, California · 8810 days ago · 16 km deep · 18 km away
  45. 1.81 km SE of Pacifica, California · 8810 days ago · 9 km deep · 58 km away
  46. 1.68 km ENE of Morgan Hill, California · 8810 days ago · 3 km deep · 98 km away
  47. 2.51 km SE of Diablo, California · 8809 days ago · 16 km deep · 19 km away
  48. 1.62 km SE of Diablo, California · 8809 days ago · 14 km deep · 19 km away
  49. 1.96 km NNE of Milpitas, California · 8809 days ago · 1 km deep · 57 km away
  50. 2.514 km ESE of Livermore, California · 8808 days ago · 0 km deep · 53 km away
  51. 1.614 km ESE of Livermore, California · 8808 days ago · 0 km deep · 53 km away
  52. 2.11 km SW of Campbell, California · 8807 days ago · 7 km deep · 78 km away
  53. 1.91 km SSE of Diablo, California · 8807 days ago · 15 km deep · 19 km away
  54. 2.92 km N of Castro Valley, California · 8805 days ago · 10 km deep · 30 km away
  55. 2.92 km N of Castro Valley, California · 8805 days ago · 10 km deep · 30 km away
  56. 2.210 km SSW of Tracy, California · 8804 days ago · 15 km deep · 62 km away
  57. 1.97 km SW of Calistoga, California · 8804 days ago · 3 km deep · 82 km away
  58. 1.55 km WSW of Moskowite Corner, California · 8801 days ago · 6 km deep · 54 km away
  59. 2.39 km SSW of Tracy, California · 8801 days ago · 14 km deep · 62 km away
  60. 2.09 km SSW of Tracy, California · 8801 days ago · 14 km deep · 61 km away

The first 60 of 91.

Before

  1. 2.05 km NNE of Milpitas, California · 8840 days ago · 0 km deep · 58 km away
  2. 2.93 km N of East Foothills, California · 8842 days ago · 0 km deep · 66 km away
  3. 2.73 km N of East Foothills, California · 8842 days ago · 2 km deep · 65 km away
  4. 1.61 km NE of Montara, California · 8842 days ago · 5 km deep · 63 km away
  5. 1.91 km NE of Montara, California · 8842 days ago · 5 km deep · 63 km away
  6. 1.69 km S of Antioch, California · 8842 days ago · 18 km deep · 20 km away
  7. 1.56 km S of Calistoga, California · 8842 days ago · 8 km deep · 78 km away
  8. 2.43 km N of East Foothills, California · 8843 days ago · 0 km deep · 66 km away
  9. 2.73 km N of East Foothills, California · 8843 days ago · 2 km deep · 65 km away
  10. 1.616 km N of Morgan Hill, California · 8843 days ago · 6 km deep · 85 km away
  11. 1.64 km ENE of La Honda, California · 8845 days ago · 0 km deep · 74 km away
  12. 1.811 km SE of Knights Landing, California · 8845 days ago · 10 km deep · 90 km away
  13. 1.710 km SE of Knights Landing, California · 8845 days ago · 9 km deep · 90 km away
  14. 3.39 km SE of Knights Landing, California · 8845 days ago · 21 km deep · 90 km away
  15. 1.89 km SE of Knights Landing, California · 8845 days ago · 13 km deep · 91 km away
  16. 2.59 km SE of Knights Landing, California · 8845 days ago · 24 km deep · 91 km away
  17. 2.210 km ESE of Davis, California · 8845 days ago · 40 km deep · 68 km away
  18. 2.44 km ESE of Sunol, California · 8845 days ago · 5 km deep · 47 km away
  19. 1.715 km E of Seven Trees, California · 8846 days ago · 6 km deep · 83 km away
  20. 3.115 km E of Seven Trees, California · 8846 days ago · 6 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc21237073. Read Mon, Oct 5, 2026, 12:06 PM UTC.