M1.9 earthquake 4km SSW of Colma, CA

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Jul 31, 2021, 4:49 AM PDT

UTC

2021-07-31 11:49:23 UTC

Depth

6.0 km (3.7 mi), shallow

Epicenter

37.650° N, 122.480° W

Region

California

Felt reports

2

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.1 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

81°

Stations used

71

• Colma, CaliforniaPopulation 1,520. Forecast3 kmSSW
• Pacifica, CaliforniaPopulation 39,260. Forecast4 kmN
• Daly City, CaliforniaPopulation 106,562. Forecast6 kmSSW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast553 kmNW

After

1. 2.04km NE of Blackhawk, CASat, Jul 31, 6:48 PM PDT · 1890 days ago · 8 km deep · 57 km away
2. 2.54km NNE of Blackhawk, CASat, Jul 31, 10:38 PM PDT · 1890 days ago · 8 km deep · 57 km away · felt by 32
3. 2.24km NNE of Blackhawk, CASun, Aug 1, 3:27 AM PDT · 1889 days ago · 9 km deep · 57 km away · felt by 2
4. 2.915km E of Seven Trees, CAMon, Aug 2, 4:05 PM PDT · 1888 days ago · 6 km deep · 81 km away · felt by 50
5. 1.87km S of Muir Beach, CAWed, Aug 4, 1:03 PM PDT · 1886 days ago · 13 km deep · 19 km away
6. 1.54km E of Moraga, CAThu, Aug 5, 2:22 PM PDT · 1885 days ago · 3 km deep · 41 km away
7. 1.911km NE of Milpitas, CAFri, Aug 6, 1:17 AM PDT · 1885 days ago · 5 km deep · 60 km away · felt by 3
8. 1.52km ESE of Berkeley, CAFri, Aug 6, 11:01 AM PDT · 1884 days ago · 4 km deep · 31 km away
9. 2.22km E of Saratoga, CASun, Aug 8, 3:24 AM PDT · 1882 days ago · 7 km deep · 61 km away · felt by 48
10. 2.45km SE of Portola Valley, CASun, Aug 8, 9:07 AM PDT · 1882 days ago · 10 km deep · 41 km away · felt by 12
11. 2.115km ENE of Alum Rock, CASun, Aug 8, 1:31 PM PDT · 1882 days ago · 5 km deep · 75 km away · felt by 3
12. 2.01km NNW of Pleasant Hill, CAMon, Aug 9, 11:29 PM PDT · 1881 days ago · 11 km deep · 50 km away · felt by 12
13. 2.18km ENE of Alum Rock, CAWed, Aug 11, 6:37 AM PDT · 1879 days ago · 7 km deep · 72 km away
14. 1.810km NE of Napa, CAWed, Aug 11, 7:03 AM PDT · 1879 days ago · 13 km deep · 82 km away
15. 2.32km WNW of Tomales, CAWed, Aug 11, 7:59 PM PDT · 1879 days ago · 4 km deep · 77 km away · felt by 17
16. 1.615km E of Seven Trees, CAThu, Aug 12, 1:15 AM PDT · 1879 days ago · 7 km deep · 81 km away
17. 1.61km NE of Berkeley, CAThu, Aug 12, 5:32 AM PDT · 1878 days ago · 6 km deep · 32 km away
18. 1.55km E of Fremont, CAFri, Aug 13, 6:05 AM PDT · 1877 days ago · 7 km deep · 50 km away
19. 1.58km SW of Calistoga, CASat, Aug 14, 4:28 AM PDT · 1876 days ago · 9 km deep · 99 km away
20. 1.75km WNW of Dublin, CASat, Aug 14, 5:01 PM PDT · 1876 days ago · 6 km deep · 45 km away
21. 2.413km NE of Yountville, CASun, Aug 15, 6:06 PM PDT · 1875 days ago · 5 km deep · 96 km away · felt by 1
22. 1.81km ENE of Alamo, CAMon, Aug 16, 9:27 AM PDT · 1874 days ago · 13 km deep · 46 km away
23. 1.82km SSW of Bodega Bay, CAThu, Aug 19, 1:17 AM PDT · 1872 days ago · 11 km deep · 90 km away
24. 1.82km SSW of Bodega Bay, CAThu, Aug 19, 2:43 AM PDT · 1871 days ago · 10 km deep · 90 km away
25. 2.12km SSW of Bodega Bay, CAThu, Aug 19, 3:12 AM PDT · 1871 days ago · 10 km deep · 89 km away
26. 1.64km SW of Colma, CAMon, Aug 23, 5:34 AM PDT · 1867 days ago · 7 km deep · 1 km away
27. 1.82km NW of Pacifica, CAMon, Aug 23, 6:18 PM PDT · 1867 days ago · 8 km deep · 3 km away · felt by 2
28. 2.115km E of Seven Trees, CAMon, Aug 23, 6:37 PM PDT · 1867 days ago · 4 km deep · 81 km away · felt by 1
29. 1.815km E of Seven Trees, CAMon, Aug 23, 6:46 PM PDT · 1867 days ago · 3 km deep · 81 km away
30. 1.77km WSW of St. Helena, CATue, Aug 24, 11:32 PM PDT · 1866 days ago · 8 km deep · 93 km away
31. 1.611km NE of Napa, CAWed, Aug 25, 2:17 AM PDT · 1865 days ago · 10 km deep · 83 km away
32. 1.83km SW of Alamo, CAThu, Aug 26, 9:13 PM PDT · 1864 days ago · 12 km deep · 43 km away
33. 2.53km ESE of Larkfield-Wikiup, CAFri, Aug 27, 11:11 AM PDT · 1863 days ago · 7 km deep · 97 km away · felt by 122
34. 1.57km WSW of St. Helena, CAFri, Aug 27, 11:27 AM PDT · 1863 days ago · 9 km deep · 92 km away
35. 2.14km S of Larkfield-Wikiup, CAFri, Aug 27, 12:11 PM PDT · 1863 days ago · 7 km deep · 95 km away · felt by 5
36. 1.78km SSW of Livermore, CASat, Aug 28, 9:50 PM PDT · 1862 days ago · 10 km deep · 61 km away
37. 1.815km E of Seven Trees, CAMon, Aug 30, 5:14 AM PDT · 1860 days ago · 3 km deep · 82 km away
38. 1.915km E of Seven Trees, CATue, Aug 31, 1:15 AM PDT · 1860 days ago · 4 km deep · 82 km away
39. 2.411km NE of Milpitas, CATue, Aug 31, 11:27 AM PDT · 1859 days ago · 4 km deep · 60 km away
40. 1.88km NNE of Black Point-Green Point, CATue, Aug 31, 2:32 PM PDT · 1859 days ago · 8 km deep · 58 km away
41. 2.66km S of Livermore, CAWed, Sep 1, 4:13 PM PDT · 1858 days ago · 4 km deep · 62 km away · felt by 81
42. 1.75km NW of Dublin, CAThu, Sep 2, 6:20 AM PDT · 1857 days ago · 7 km deep · 45 km away
43. 2.014km N of Morgan Hill, CAFri, Sep 3, 1:09 PM PDT · 1856 days ago · 4 km deep · 87 km away · felt by 2
44. 1.910km NE of Milpitas, CASat, Sep 4, 12:25 PM PDT · 1855 days ago · 4 km deep · 60 km away
45. 1.71km N of Bolinas, CASun, Sep 5, 10:04 AM PDT · 1854 days ago · 9 km deep · 35 km away
46. 1.57km S of Calistoga, CAMon, Sep 6, 3:48 AM PDT · 1853 days ago · 8 km deep · 97 km away
47. 1.76km WNW of Dublin, CAThu, Sep 9, 6:56 PM PDT · 1850 days ago · 7 km deep · 44 km away · felt by 3
48. 1.73km ESE of Pacheco, CAFri, Sep 10, 5:03 PM PDT · 1849 days ago · 12 km deep · 52 km away
49. 1.81km NW of Diablo, CASun, Sep 12, 5:31 AM PDT · 1847 days ago · 8 km deep · 50 km away
50. 2.910km NE of Milpitas, CATue, Sep 14, 11:45 AM PDT · 1845 days ago · 5 km deep · 60 km away · felt by 139
51. 1.86km W of Allendale, CATue, Sep 14, 10:42 PM PDT · 1845 days ago · 21 km deep · 98 km away
52. 2.38km ESE of Fremont, CAWed, Sep 15, 7:08 PM PDT · 1844 days ago · 7 km deep · 53 km away · felt by 6
53. 3.16km WNW of Dublin, CASat, Sep 18, 5:09 PM PDT · 1841 days ago · 7 km deep · 44 km away · felt by 379
54. 1.56km WNW of Dublin, CASat, Sep 18, 5:10 PM PDT · 1841 days ago · 6 km deep · 44 km away
55. 2.49km ESE of Fremont, CASun, Sep 19, 2:21 AM PDT · 1840 days ago · 7 km deep · 54 km away · felt by 8
56. 1.65km NW of Dublin, CASun, Sep 19, 12:50 PM PDT · 1840 days ago · 6 km deep · 45 km away
57. 1.53km NNW of Union City, CATue, Sep 21, 6:01 AM PDT · 1838 days ago · 3 km deep · 40 km away
58. 1.83km SE of Larkfield-Wikiup, CATue, Sep 21, 5:19 PM PDT · 1838 days ago · 5 km deep · 97 km away · felt by 5
59. 1.75km NW of Dublin, CATue, Sep 21, 11:39 PM PDT · 1838 days ago · 5 km deep · 45 km away
60. 2.59km ENE of Milpitas, CAWed, Sep 22, 10:16 AM PDT · 1837 days ago · 7 km deep · 62 km away · felt by 23

The first 60 of 67.

Before

1. 1.516km SSE of Livermore, CASat, Jul 31, 4:04 AM PDT · 1890 days ago · 3 km deep · 70 km away
2. 2.32km WNW of Concord, CATue, Jul 27, 12:46 PM PDT · 1894 days ago · 17 km deep · 53 km away · felt by 4
3. 2.16km SSW of Calistoga, CAMon, Jul 26, 3:35 AM PDT · 1895 days ago · 9 km deep · 98 km away · felt by 4
4. 1.72km E of Berkeley, CAMon, Jul 26, 12:44 AM PDT · 1896 days ago · 9 km deep · 32 km away
5. 1.85km E of Fremont, CASun, Jul 25, 5:16 PM PDT · 1896 days ago · 9 km deep · 51 km away
6. 2.18km S of Muir Beach, CASun, Jul 25, 9:11 AM PDT · 1896 days ago · 4 km deep · 18 km away · felt by 2
7. 1.68km S of Muir Beach, CASat, Jul 24, 5:41 PM PDT · 1897 days ago · 5 km deep · 18 km away
8. 1.611km ENE of Yountville, CASat, Jul 24, 10:13 AM PDT · 1897 days ago · 6 km deep · 88 km away
9. 1.73km NNW of Byron, CAWed, Jul 21, 7:11 AM PDT · 1900 days ago · 4 km deep · 78 km away
10. 1.97km ESE of Roseland, CATue, Jul 20, 10:36 PM PDT · 1901 days ago · 9 km deep · 84 km away
11. 1.68km SW of Calistoga, CAMon, Jul 19, 7:22 AM PDT · 1902 days ago · 6 km deep · 99 km away
12. 1.610km ESE of Angwin, CASun, Jul 18, 9:24 PM PDT · 1903 days ago · 4 km deep · 100 km away
13. 1.63km NNW of Piedmont, CASat, Jul 17, 6:42 AM PDT · 1904 days ago · 8 km deep · 31 km away
14. 1.613km N of Morgan Hill, CAThu, Jul 15, 10:00 PM PDT · 1906 days ago · 4 km deep · 87 km away
15. 1.88km SW of Loyola, CASun, Jul 11, 9:55 AM PDT · 1910 days ago · 6 km deep · 48 km away
16. 1.79km NNE of Alum Rock, CASun, Jul 11, 7:08 AM PDT · 1910 days ago · 9 km deep · 67 km away
17. 2.12km ENE of Berkeley, CASun, Jul 11, 3:42 AM PDT · 1910 days ago · 9 km deep · 32 km away · felt by 11
18. 1.719km SE of Livermore, CAMon, Jul 5, 10:40 PM PDT · 1916 days ago · 2 km deep · 79 km away
19. 2.09km NE of Milpitas, CASat, Jul 3, 2:04 AM PDT · 1919 days ago · 8 km deep · 60 km away · felt by 3
20. 1.73km WNW of Castro Valley, CAFri, Jul 2, 7:03 AM PDT · 1919 days ago · 8 km deep · 33 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73603141. Read Sat, Oct 3, 2026, 8:42 PM UTC.