California earthquakes

M1.8 earthquake 2km NW of Pacifica, CA

A magnitude 1.8 earthquake struck 2km NW of Pacifica, CA on Mon, Aug 23, 2021, 6:18 PM PDT (01:18 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.4 3km N of San Leandro, CA. This one was a foreshock.

Pacifica 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-08-24 01:18:22 UTC
Depth
8.3 km (5.2 mi), shallow
Epicenter
37.628° N, 122.508° W
Felt reports
2
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

2 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 0.3 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
158°
Stations used
51

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 70 in the 60 days after this one and 32 in the 30 days before it.

After

  1. 2.115km E of Seven Trees, CA · 1867 days ago · 4 km deep · 83 km away · felt by 1
  2. 1.815km E of Seven Trees, CA · 1867 days ago · 3 km deep · 82 km away
  3. 1.77km WSW of St. Helena, CA · 1866 days ago · 8 km deep · 96 km away
  4. 1.611km NE of Napa, CA · 1866 days ago · 10 km deep · 86 km away
  5. 1.83km SW of Alamo, CA · 1864 days ago · 12 km deep · 46 km away
  6. 2.53km ESE of Larkfield-Wikiup, CA · 1864 days ago · 7 km deep · 99 km away · felt by 122
  7. 1.57km WSW of St. Helena, CA · 1864 days ago · 9 km deep · 95 km away
  8. 2.14km S of Larkfield-Wikiup, CA · 1864 days ago · 7 km deep · 97 km away · felt by 5
  9. 1.78km SSW of Livermore, CA · 1862 days ago · 10 km deep · 63 km away
  10. 1.815km E of Seven Trees, CA · 1861 days ago · 3 km deep · 83 km away
  11. 1.915km E of Seven Trees, CA · 1860 days ago · 4 km deep · 83 km away
  12. 2.411km NE of Milpitas, CA · 1860 days ago · 4 km deep · 62 km away
  13. 1.88km NNE of Black Point-Green Point, CA · 1859 days ago · 8 km deep · 61 km away
  14. 2.66km S of Livermore, CA · 1858 days ago · 4 km deep · 65 km away · felt by 81
  15. 1.75km NW of Dublin, CA · 1858 days ago · 7 km deep · 47 km away
  16. 2.014km N of Morgan Hill, CA · 1857 days ago · 4 km deep · 88 km away · felt by 2
  17. 1.910km NE of Milpitas, CA · 1856 days ago · 4 km deep · 62 km away
  18. 1.71km N of Bolinas, CA · 1855 days ago · 9 km deep · 36 km away
  19. 1.57km S of Calistoga, CA · 1854 days ago · 8 km deep · 99 km away
  20. 1.76km WNW of Dublin, CA · 1850 days ago · 7 km deep · 47 km away · felt by 3
  21. 1.73km ESE of Pacheco, CA · 1849 days ago · 12 km deep · 56 km away
  22. 1.81km NW of Diablo, CA · 1848 days ago · 8 km deep · 53 km away
  23. 2.910km NE of Milpitas, CA · 1846 days ago · 5 km deep · 62 km away · felt by 139
  24. 2.38km ESE of Fremont, CA · 1844 days ago · 7 km deep · 55 km away · felt by 6
  25. 3.16km WNW of Dublin, CA · 1841 days ago · 7 km deep · 47 km away · felt by 379
  26. 1.56km WNW of Dublin, CA · 1841 days ago · 6 km deep · 47 km away
  27. 2.49km ESE of Fremont, CA · 1841 days ago · 7 km deep · 56 km away · felt by 8
  28. 1.65km NW of Dublin, CA · 1841 days ago · 6 km deep · 48 km away
  29. 1.53km NNW of Union City, CA · 1839 days ago · 3 km deep · 42 km away
  30. 1.83km SE of Larkfield-Wikiup, CA · 1838 days ago · 5 km deep · 98 km away · felt by 5
  31. 1.75km NW of Dublin, CA · 1838 days ago · 5 km deep · 47 km away
  32. 2.59km ENE of Milpitas, CA · 1838 days ago · 7 km deep · 64 km away · felt by 23
  33. 1.94km SW of Newark, CA · 1837 days ago · 12 km deep · 40 km away · felt by 2
  34. 1.85km WNW of Dublin, CA · 1836 days ago · 7 km deep · 47 km away · felt by 1
  35. 1.81km WNW of Walnut Creek, CA · 1836 days ago · 11 km deep · 49 km away · felt by 2
  36. 2.71km SSE of Vallejo, CA · 1836 days ago · 11 km deep · 58 km away · felt by 481
  37. 2.12km E of Hayward, CA · 1835 days ago · 3 km deep · 40 km away · felt by 22
  38. 1.514km SW of Portola Valley, CA · 1832 days ago · 4 km deep · 38 km away
  39. 1.510km E of Alum Rock, CA · 1830 days ago · 8 km deep · 76 km away
  40. 3.23km ESE of Santa Rosa, CA · 1830 days ago · 9 km deep · 92 km away · felt by 1,048
  41. 1.611km NE of Napa, CA · 1829 days ago · 9 km deep · 86 km away
  42. 3.03km N of San Leandro, CA · 1828 days ago · 7 km deep · 34 km away · felt by 860
  43. 1.59km NE of Santa Rosa, CA · 1828 days ago · 4 km deep · 98 km away
  44. 1.78km NNE of Alum Rock, CA · 1828 days ago · 4 km deep · 67 km away · felt by 1
  45. 3.43km N of San Leandro, CA · 1828 days ago · 6 km deep · 34 km away · felt by 1,793
  46. 1.53km N of San Leandro, CA · 1827 days ago · 6 km deep · 34 km away · felt by 14
  47. 3.312km NNE of Morgan Hill, CA · 1827 days ago · 4 km deep · 90 km away · felt by 103
  48. 2.019km NE of Alum Rock, CA · 1827 days ago · 6 km deep · 74 km away
  49. 1.85km SW of San Francisco Zoo, CA · 1826 days ago · 7 km deep · 9 km away
  50. 2.70km N of Byron, CA · 1826 days ago · 4 km deep · 81 km away · felt by 48
  51. 1.61km S of Blackhawk, CA · 1825 days ago · 9 km deep · 57 km away
  52. 1.82km SE of Pacheco, CA · 1824 days ago · 15 km deep · 55 km away
  53. 1.95km SW of Pacheco, CA · 1824 days ago · 10 km deep · 50 km away · felt by 1
  54. 2.16km SSW of Yountville, CA · 1824 days ago · 8 km deep · 81 km away · felt by 4
  55. 2.16km SSW of Moraga, CA · 1823 days ago · 10 km deep · 35 km away · felt by 6
  56. 2.14km WSW of Alamo, CA · 1822 days ago · 15 km deep · 45 km away · felt by 3
  57. 1.64km SSW of San Francisco Zoo, CA · 1822 days ago · 7 km deep · 8 km away · felt by 1
  58. 1.612km W of Saratoga, CA · 1821 days ago · 8 km deep · 53 km away
  59. 2.516km SSW of Bonny Doon, CA · 1821 days ago · 5 km deep · 84 km away · felt by 10
  60. 1.711km WSW of Saratoga, CA · 1820 days ago · 8 km deep · 53 km away

The first 60 of 70.

Before

  1. 1.64km SW of Colma, CA · 1868 days ago · 7 km deep · 3 km away
  2. 2.12km SSW of Bodega Bay, CA · 1872 days ago · 10 km deep · 90 km away
  3. 1.82km SSW of Bodega Bay, CA · 1872 days ago · 10 km deep · 91 km away
  4. 1.82km SSW of Bodega Bay, CA · 1872 days ago · 11 km deep · 90 km away
  5. 1.81km ENE of Alamo, CA · 1875 days ago · 13 km deep · 50 km away
  6. 2.413km NE of Yountville, CA · 1875 days ago · 5 km deep · 98 km away · felt by 1
  7. 1.75km WNW of Dublin, CA · 1876 days ago · 6 km deep · 48 km away
  8. 1.55km E of Fremont, CA · 1878 days ago · 7 km deep · 52 km away
  9. 1.61km NE of Berkeley, CA · 1879 days ago · 6 km deep · 35 km away
  10. 1.615km E of Seven Trees, CA · 1879 days ago · 7 km deep · 82 km away
  11. 2.32km WNW of Tomales, CA · 1879 days ago · 4 km deep · 78 km away · felt by 17
  12. 1.810km NE of Napa, CA · 1880 days ago · 13 km deep · 85 km away
  13. 2.18km ENE of Alum Rock, CA · 1880 days ago · 7 km deep · 74 km away
  14. 2.01km NNW of Pleasant Hill, CA · 1881 days ago · 11 km deep · 53 km away · felt by 12
  15. 2.115km ENE of Alum Rock, CA · 1883 days ago · 5 km deep · 77 km away · felt by 3
  16. 2.45km SE of Portola Valley, CA · 1883 days ago · 10 km deep · 41 km away · felt by 12
  17. 2.22km E of Saratoga, CA · 1883 days ago · 7 km deep · 61 km away · felt by 48
  18. 1.52km ESE of Berkeley, CA · 1885 days ago · 4 km deep · 35 km away
  19. 1.911km NE of Milpitas, CA · 1885 days ago · 5 km deep · 62 km away · felt by 3
  20. 1.54km E of Moraga, CA · 1885 days ago · 3 km deep · 44 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73614511. Read Sun, Oct 4, 2026, 8:03 AM UTC.