California earthquakes

M2.3 earthquake 2km WNW of Concord, CA

A magnitude 2.3 earthquake struck 2km WNW of Concord, CA on Tue, Jul 27, 2021, 12:46 PM PDT (19:46 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M3.1 6km WNW of Dublin, CA. 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
2021-07-27 19:46:58 UTC
Depth
17.0 km (10.6 mi), shallow
Epicenter
37.974° N, 122.032° W
Felt reports
4
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

4 people reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
98°
Stations used
65

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 77 in the 60 days after this one and 33 in the 30 days before it.

After

  1. 1.516km SSE of Livermore, CA · 1890 days ago · 3 km deep · 56 km away
  2. 1.94km SSW of Colma, CA · 1890 days ago · 6 km deep · 53 km away · felt by 2
  3. 2.04km NE of Blackhawk, CA · 1890 days ago · 8 km deep · 19 km away
  4. 2.54km NNE of Blackhawk, CA · 1890 days ago · 8 km deep · 19 km away · felt by 32
  5. 2.24km NNE of Blackhawk, CA · 1889 days ago · 9 km deep · 19 km away · felt by 2
  6. 2.915km E of Seven Trees, CA · 1888 days ago · 6 km deep · 81 km away · felt by 50
  7. 1.710km NNE of Angwin, CA · 1887 days ago · 7 km deep · 83 km away
  8. 1.87km S of Muir Beach, CA · 1886 days ago · 13 km deep · 53 km away
  9. 1.54km E of Moraga, CA · 1885 days ago · 3 km deep · 16 km away
  10. 1.911km NE of Milpitas, CA · 1885 days ago · 5 km deep · 56 km away · felt by 3
  11. 1.52km ESE of Berkeley, CA · 1884 days ago · 4 km deep · 23 km away
  12. 2.22km E of Saratoga, CA · 1882 days ago · 7 km deep · 79 km away · felt by 48
  13. 2.45km SE of Portola Valley, CA · 1882 days ago · 10 km deep · 71 km away · felt by 12
  14. 2.115km ENE of Alum Rock, CA · 1882 days ago · 5 km deep · 69 km away · felt by 3
  15. 2.212km ESE of Hidden Valley Lake, CA · 1881 days ago · 10 km deep · 95 km away
  16. 2.01km NNW of Pleasant Hill, CA · 1881 days ago · 11 km deep · 4 km away · felt by 12
  17. 2.18km ENE of Alum Rock, CA · 1879 days ago · 7 km deep · 71 km away
  18. 1.810km NE of Napa, CA · 1879 days ago · 13 km deep · 44 km away
  19. 1.612km ESE of Hidden Valley Lake, CA · 1879 days ago · 8 km deep · 94 km away
  20. 2.32km WNW of Tomales, CA · 1879 days ago · 4 km deep · 84 km away · felt by 17
  21. 1.615km E of Seven Trees, CA · 1879 days ago · 7 km deep · 81 km away
  22. 1.61km NE of Berkeley, CA · 1878 days ago · 6 km deep · 23 km away
  23. 1.55km E of Fremont, CA · 1877 days ago · 7 km deep · 49 km away
  24. 1.58km SW of Calistoga, CA · 1876 days ago · 9 km deep · 82 km away
  25. 1.75km WNW of Dublin, CA · 1876 days ago · 6 km deep · 28 km away
  26. 2.413km NE of Yountville, CA · 1875 days ago · 5 km deep · 61 km away · felt by 1
  27. 1.81km ENE of Alamo, CA · 1874 days ago · 13 km deep · 14 km away
  28. 1.513km E of Angwin, CA · 1874 days ago · 3 km deep · 69 km away
  29. 2.512km ESE of Angwin, CA · 1874 days ago · 0 km deep · 68 km away · felt by 5
  30. 1.82km SSW of Bodega Bay, CA · 1872 days ago · 11 km deep · 97 km away
  31. 1.82km SSW of Bodega Bay, CA · 1871 days ago · 10 km deep · 97 km away
  32. 2.12km SSW of Bodega Bay, CA · 1871 days ago · 10 km deep · 97 km away
  33. 1.64km SW of Colma, CA · 1867 days ago · 7 km deep · 54 km away
  34. 1.82km NW of Pacifica, CA · 1867 days ago · 8 km deep · 57 km away · felt by 2
  35. 2.115km E of Seven Trees, CA · 1867 days ago · 4 km deep · 82 km away · felt by 1
  36. 1.815km E of Seven Trees, CA · 1867 days ago · 3 km deep · 82 km away
  37. 2.07km W of Calistoga, CA · 1867 days ago · 8 km deep · 86 km away · felt by 8
  38. 1.77km WSW of St. Helena, CA · 1866 days ago · 8 km deep · 73 km away
  39. 1.611km NE of Napa, CA · 1865 days ago · 10 km deep · 45 km away
  40. 1.83km SW of Alamo, CA · 1864 days ago · 12 km deep · 16 km away
  41. 2.53km ESE of Larkfield-Wikiup, CA · 1863 days ago · 7 km deep · 84 km away · felt by 122
  42. 1.57km WSW of St. Helena, CA · 1863 days ago · 9 km deep · 72 km away
  43. 2.14km S of Larkfield-Wikiup, CA · 1863 days ago · 7 km deep · 84 km away · felt by 5
  44. 1.78km SSW of Livermore, CA · 1862 days ago · 10 km deep · 46 km away
  45. 1.815km E of Seven Trees, CA · 1860 days ago · 3 km deep · 82 km away
  46. 1.810km NNE of Windsor, CA · 1860 days ago · 7 km deep · 96 km away
  47. 1.915km E of Seven Trees, CA · 1860 days ago · 4 km deep · 83 km away
  48. 2.411km NE of Milpitas, CA · 1859 days ago · 4 km deep · 56 km away
  49. 1.88km NNE of Black Point-Green Point, CA · 1859 days ago · 8 km deep · 45 km away
  50. 1.73km SW of Angwin, CA · 1858 days ago · 4 km deep · 76 km away
  51. 2.66km S of Livermore, CA · 1858 days ago · 4 km deep · 45 km away · felt by 81
  52. 1.75km NW of Dublin, CA · 1857 days ago · 7 km deep · 27 km away
  53. 2.014km N of Morgan Hill, CA · 1856 days ago · 4 km deep · 87 km away · felt by 2
  54. 1.910km NE of Milpitas, CA · 1855 days ago · 4 km deep · 56 km away
  55. 1.71km N of Bolinas, CA · 1854 days ago · 9 km deep · 58 km away
  56. 1.57km S of Calistoga, CA · 1853 days ago · 8 km deep · 78 km away
  57. 1.76km WNW of Dublin, CA · 1850 days ago · 7 km deep · 28 km away · felt by 3
  58. 1.73km ESE of Pacheco, CA · 1849 days ago · 12 km deep · 1 km away
  59. 1.81km NW of Diablo, CA · 1847 days ago · 8 km deep · 16 km away
  60. 2.910km NE of Milpitas, CA · 1845 days ago · 5 km deep · 56 km away · felt by 139

The first 60 of 77.

Before

  1. 2.16km SSW of Calistoga, CA · 1895 days ago · 9 km deep · 79 km away · felt by 4
  2. 1.72km E of Berkeley, CA · 1896 days ago · 9 km deep · 22 km away
  3. 1.85km E of Fremont, CA · 1896 days ago · 9 km deep · 49 km away
  4. 2.18km S of Muir Beach, CA · 1896 days ago · 4 km deep · 51 km away · felt by 2
  5. 1.68km S of Muir Beach, CA · 1897 days ago · 5 km deep · 52 km away
  6. 1.611km ENE of Yountville, CA · 1897 days ago · 6 km deep · 53 km away
  7. 1.73km NNW of Byron, CA · 1900 days ago · 4 km deep · 35 km away
  8. 1.97km ESE of Roseland, CA · 1901 days ago · 9 km deep · 72 km away
  9. 1.68km SW of Calistoga, CA · 1902 days ago · 6 km deep · 82 km away
  10. 1.610km ESE of Angwin, CA · 1903 days ago · 4 km deep · 69 km away
  11. 1.63km NNW of Piedmont, CA · 1904 days ago · 8 km deep · 23 km away
  12. 1.613km N of Morgan Hill, CA · 1906 days ago · 4 km deep · 88 km away
  13. 1.88km SW of Loyola, CA · 1910 days ago · 6 km deep · 76 km away
  14. 1.79km NNE of Alum Rock, CA · 1910 days ago · 9 km deep · 64 km away
  15. 2.12km ENE of Berkeley, CA · 1910 days ago · 9 km deep · 22 km away · felt by 11
  16. 1.810km ESE of Angwin, CA · 1913 days ago · 6 km deep · 69 km away
  17. 1.514km E of Angwin, CA · 1913 days ago · 3 km deep · 69 km away
  18. 1.910km ESE of Angwin, CA · 1914 days ago · 6 km deep · 70 km away
  19. 1.712km ESE of Angwin, CA · 1914 days ago · 6 km deep · 69 km away
  20. 1.714km E of Angwin, CA · 1914 days ago · 10 km deep · 69 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73600486. Read Sat, Oct 3, 2026, 8:42 PM UTC.