M1.8 earthquake 1km ENE of Alamo, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Aug 16, 2021, 9:27 AM PDT

UTC

2021-08-16 16:27:16 UTC

Depth

13.0 km (8.1 mi), shallow

Epicenter

37.852° N, 122.021° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.3 km in depth

Magnitude uncertainty

±0.18

Depth from

From location

Station coverage gap

37°

Stations used

46

• Alamo, CaliforniaPopulation 14,570. Forecast1 kmENE
• Concord, CaliforniaPopulation 128,667. Forecast14 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast542 kmNW

After

1. 1.513km E of Angwin, CAMon, Aug 16, 12:59 PM PDT · 1874 days ago · 3 km deep · 82 km away
2. 2.512km ESE of Angwin, CAMon, Aug 16, 12:59 PM PDT · 1874 days ago · 0 km deep · 81 km away · felt by 5
3. 1.64km SW of Colma, CAMon, Aug 23, 5:34 AM PDT · 1867 days ago · 7 km deep · 47 km away
4. 1.82km NW of Pacifica, CAMon, Aug 23, 6:18 PM PDT · 1867 days ago · 8 km deep · 50 km away · felt by 2
5. 2.115km E of Seven Trees, CAMon, Aug 23, 6:37 PM PDT · 1867 days ago · 4 km deep · 69 km away · felt by 1
6. 1.815km E of Seven Trees, CAMon, Aug 23, 6:46 PM PDT · 1867 days ago · 3 km deep · 69 km away
7. 2.07km W of Calistoga, CAMon, Aug 23, 10:13 PM PDT · 1867 days ago · 8 km deep · 97 km away · felt by 8
8. 1.77km WSW of St. Helena, CATue, Aug 24, 11:32 PM PDT · 1866 days ago · 8 km deep · 84 km away
9. 1.611km NE of Napa, CAWed, Aug 25, 2:17 AM PDT · 1865 days ago · 10 km deep · 58 km away
10. 1.83km SW of Alamo, CAThu, Aug 26, 9:13 PM PDT · 1864 days ago · 12 km deep · 4 km away
11. 2.53km ESE of Larkfield-Wikiup, CAFri, Aug 27, 11:11 AM PDT · 1863 days ago · 7 km deep · 95 km away · felt by 122
12. 1.57km WSW of St. Helena, CAFri, Aug 27, 11:27 AM PDT · 1863 days ago · 9 km deep · 83 km away
13. 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
14. 1.78km SSW of Livermore, CASat, Aug 28, 9:50 PM PDT · 1862 days ago · 10 km deep · 34 km away
15. 1.815km E of Seven Trees, CAMon, Aug 30, 5:14 AM PDT · 1860 days ago · 3 km deep · 69 km away
16. 1.915km E of Seven Trees, CATue, Aug 31, 1:15 AM PDT · 1860 days ago · 4 km deep · 70 km away
17. 2.411km NE of Milpitas, CATue, Aug 31, 11:27 AM PDT · 1859 days ago · 4 km deep · 43 km away
18. 1.88km NNE of Black Point-Green Point, CATue, Aug 31, 2:32 PM PDT · 1859 days ago · 8 km deep · 53 km away
19. 1.73km SW of Angwin, CAWed, Sep 1, 1:01 PM PDT · 1858 days ago · 4 km deep · 88 km away
20. 2.66km S of Livermore, CAWed, Sep 1, 4:13 PM PDT · 1858 days ago · 4 km deep · 34 km away · felt by 81
21. 1.75km NW of Dublin, CAThu, Sep 2, 6:20 AM PDT · 1857 days ago · 7 km deep · 14 km away
22. 2.014km N of Morgan Hill, CAFri, Sep 3, 1:09 PM PDT · 1856 days ago · 4 km deep · 75 km away · felt by 2
23. 1.910km NE of Milpitas, CASat, Sep 4, 12:25 PM PDT · 1855 days ago · 4 km deep · 43 km away
24. 1.71km N of Bolinas, CASun, Sep 5, 10:04 AM PDT · 1854 days ago · 9 km deep · 59 km away
25. 1.57km S of Calistoga, CAMon, Sep 6, 3:48 AM PDT · 1853 days ago · 8 km deep · 89 km away
26. 1.76km WNW of Dublin, CAThu, Sep 9, 6:56 PM PDT · 1850 days ago · 7 km deep · 14 km away · felt by 3
27. 1.73km ESE of Pacheco, CAFri, Sep 10, 5:03 PM PDT · 1849 days ago · 12 km deep · 14 km away
28. 1.81km NW of Diablo, CASun, Sep 12, 5:31 AM PDT · 1847 days ago · 8 km deep · 5 km away
29. 2.910km NE of Milpitas, CATue, Sep 14, 11:45 AM PDT · 1845 days ago · 5 km deep · 43 km away · felt by 139
30. 1.86km W of Allendale, CATue, Sep 14, 10:42 PM PDT · 1845 days ago · 21 km deep · 66 km away
31. 2.38km ESE of Fremont, CAWed, Sep 15, 7:08 PM PDT · 1844 days ago · 7 km deep · 38 km away · felt by 6
32. 3.16km WNW of Dublin, CASat, Sep 18, 5:09 PM PDT · 1841 days ago · 7 km deep · 14 km away · felt by 379
33. 1.56km WNW of Dublin, CASat, Sep 18, 5:10 PM PDT · 1841 days ago · 6 km deep · 14 km away
34. 2.49km ESE of Fremont, CASun, Sep 19, 2:21 AM PDT · 1840 days ago · 7 km deep · 39 km away · felt by 8
35. 1.65km NW of Dublin, CASun, Sep 19, 12:50 PM PDT · 1840 days ago · 6 km deep · 14 km away
36. 1.53km NNW of Union City, CATue, Sep 21, 6:01 AM PDT · 1838 days ago · 3 km deep · 25 km away
37. 1.83km SE of Larkfield-Wikiup, CATue, Sep 21, 5:19 PM PDT · 1838 days ago · 5 km deep · 94 km away · felt by 5
38. 1.75km NW of Dublin, CATue, Sep 21, 11:39 PM PDT · 1838 days ago · 5 km deep · 14 km away
39. 2.59km ENE of Milpitas, CAWed, Sep 22, 10:16 AM PDT · 1837 days ago · 7 km deep · 47 km away · felt by 23
40. 1.94km SW of Newark, CAWed, Sep 22, 11:46 PM PDT · 1837 days ago · 12 km deep · 39 km away · felt by 2
41. 1.85km WNW of Dublin, CAThu, Sep 23, 5:18 PM PDT · 1836 days ago · 7 km deep · 15 km away · felt by 1
42. 1.81km WNW of Walnut Creek, CAThu, Sep 23, 6:44 PM PDT · 1836 days ago · 11 km deep · 8 km away · felt by 2
43. 2.71km SSE of Vallejo, CAFri, Sep 24, 12:04 AM PDT · 1836 days ago · 11 km deep · 33 km away · felt by 481
44. 2.12km E of Hayward, CASat, Sep 25, 9:39 AM PDT · 1834 days ago · 3 km deep · 23 km away · felt by 22
45. 1.514km SW of Portola Valley, CAMon, Sep 27, 6:48 PM PDT · 1832 days ago · 4 km deep · 67 km away
46. 1.76km SW of Calistoga, CATue, Sep 28, 6:00 PM PDT · 1831 days ago · 8 km deep · 92 km away
47. 1.510km E of Alum Rock, CAThu, Sep 30, 12:08 AM PDT · 1830 days ago · 8 km deep · 61 km away
48. 3.23km ESE of Santa Rosa, CAThu, Sep 30, 5:45 AM PDT · 1829 days ago · 9 km deep · 87 km away · felt by 1,048
49. 1.611km NE of Napa, CAFri, Oct 1, 12:27 PM PDT · 1828 days ago · 9 km deep · 59 km away
50. 3.03km N of San Leandro, CAFri, Oct 1, 7:15 PM PDT · 1828 days ago · 7 km deep · 16 km away · felt by 860
51. 1.59km NE of Santa Rosa, CASat, Oct 2, 6:08 AM PDT · 1827 days ago · 4 km deep · 89 km away
52. 1.78km NNE of Alum Rock, CASat, Oct 2, 7:53 AM PDT · 1827 days ago · 4 km deep · 51 km away · felt by 1
53. 3.43km N of San Leandro, CASat, Oct 2, 12:22 PM PDT · 1827 days ago · 6 km deep · 16 km away · felt by 1,793
54. 1.53km N of San Leandro, CASat, Oct 2, 1:34 PM PDT · 1827 days ago · 6 km deep · 16 km away · felt by 14
55. 3.312km NNE of Morgan Hill, CASun, Oct 3, 5:02 AM PDT · 1826 days ago · 4 km deep · 78 km away · felt by 103
56. 2.019km NE of Alum Rock, CASun, Oct 3, 1:27 PM PDT · 1826 days ago · 6 km deep · 49 km away
57. 1.85km SW of San Francisco Zoo, CASun, Oct 3, 1:51 PM PDT · 1826 days ago · 7 km deep · 49 km away
58. 2.70km N of Byron, CAMon, Oct 4, 9:36 AM PDT · 1825 days ago · 4 km deep · 34 km away · felt by 48
59. 1.61km S of Blackhawk, CATue, Oct 5, 9:56 AM PDT · 1824 days ago · 9 km deep · 11 km away
60. 1.82km SE of Pacheco, CATue, Oct 5, 5:53 PM PDT · 1824 days ago · 15 km deep · 14 km away

The first 60 of 72.

Before

1. 2.413km NE of Yountville, CASun, Aug 15, 6:06 PM PDT · 1875 days ago · 5 km deep · 74 km away · felt by 1
2. 1.75km WNW of Dublin, CASat, Aug 14, 5:01 PM PDT · 1876 days ago · 6 km deep · 15 km away
3. 1.58km SW of Calistoga, CASat, Aug 14, 4:28 AM PDT · 1876 days ago · 9 km deep · 94 km away
4. 1.55km E of Fremont, CAFri, Aug 13, 6:05 AM PDT · 1877 days ago · 7 km deep · 35 km away
5. 1.61km NE of Berkeley, CAThu, Aug 12, 5:32 AM PDT · 1878 days ago · 6 km deep · 21 km away
6. 1.615km E of Seven Trees, CAThu, Aug 12, 1:15 AM PDT · 1879 days ago · 7 km deep · 69 km away
7. 2.32km WNW of Tomales, CAWed, Aug 11, 7:59 PM PDT · 1879 days ago · 4 km deep · 90 km away · felt by 17
8. 1.810km NE of Napa, CAWed, Aug 11, 7:03 AM PDT · 1879 days ago · 13 km deep · 57 km away
9. 2.18km ENE of Alum Rock, CAWed, Aug 11, 6:37 AM PDT · 1879 days ago · 7 km deep · 58 km away
10. 2.01km NNW of Pleasant Hill, CAMon, Aug 9, 11:29 PM PDT · 1881 days ago · 11 km deep · 13 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 · 57 km away · felt by 3
12. 2.45km SE of Portola Valley, CASun, Aug 8, 9:07 AM PDT · 1882 days ago · 10 km deep · 58 km away · felt by 12
13. 2.22km E of Saratoga, CASun, Aug 8, 3:24 AM PDT · 1882 days ago · 7 km deep · 66 km away · felt by 48
14. 2.29km NE of Gilroy, CAFri, Aug 6, 5:57 PM PDT · 1884 days ago · 3 km deep · 98 km away
15. 1.52km ESE of Berkeley, CAFri, Aug 6, 11:01 AM PDT · 1884 days ago · 4 km deep · 20 km away
16. 1.911km NE of Milpitas, CAFri, Aug 6, 1:17 AM PDT · 1885 days ago · 5 km deep · 43 km away · felt by 3
17. 1.54km E of Moraga, CAThu, Aug 5, 2:22 PM PDT · 1885 days ago · 3 km deep · 6 km away
18. 1.87km S of Muir Beach, CAWed, Aug 4, 1:03 PM PDT · 1886 days ago · 13 km deep · 50 km away
19. 1.710km NNE of Angwin, CAWed, Aug 4, 12:30 AM PDT · 1887 days ago · 7 km deep · 96 km away
20. 2.29km ENE of San Martin, CATue, Aug 3, 6:57 PM PDT · 1887 days ago · 6 km deep · 92 km away · felt by 1

From the USGS Earthquake Hazards Program and its partner networks, event nc73610731. Read Sat, Oct 3, 2026, 8:17 PM UTC.