M1.6 earthquake 1km SW of Alamo, CA

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Oct 23, 2021, 2:48 PM PDT

UTC

2021-10-23 21:48:49 UTC

Depth

8.8 km (5.5 mi), shallow

Epicenter

37.843° N, 122.042° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.2 km in depth

Magnitude uncertainty

±0.15

Depth from

From location

Station coverage gap

51°

Stations used

39

• Alamo, CaliforniaPopulation 14,570. Forecast1 kmSW
• Concord, CaliforniaPopulation 128,667. Forecast15 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast543 kmNW

After

1. 1.64km ENE of Burlingame, CASun, Oct 24, 6:26 AM PDT · 1807 days ago · 8 km deep · 37 km away · felt by 2
2. 2.34km SE of Larkfield-Wikiup, CAMon, Oct 25, 4:47 AM PDT · 1806 days ago · 8 km deep · 93 km away · felt by 9
3. 1.922km NE of Morgan Hill, CAMon, Oct 25, 6:45 AM PDT · 1806 days ago · 9 km deep · 82 km away
4. 2.07km W of Kenwood, CAMon, Oct 25, 7:39 PM PDT · 1805 days ago · 5 km deep · 82 km away · felt by 3
5. 2.68km ENE of Alum Rock, CAMon, Oct 25, 11:55 PM PDT · 1805 days ago · 7 km deep · 57 km away · felt by 18
6. 2.09km SW of Brentwood, CASun, Oct 31, 4:08 PM PDT · 1799 days ago · 17 km deep · 22 km away
7. 1.52km SW of San Francisco Zoo, CASun, Oct 31, 7:32 PM PDT · 1799 days ago · 7 km deep · 45 km away · felt by 1
8. 1.61km SSE of San Ramon, CATue, Nov 2, 11:42 AM PDT · 1797 days ago · 8 km deep · 10 km away
9. 1.66km N of San Leandro, CATue, Nov 2, 12:44 PM PDT · 1797 days ago · 9 km deep · 12 km away
10. 1.511km SW of Mountain House, CAThu, Nov 4, 10:33 AM PDT · 1796 days ago · 17 km deep · 41 km away
11. 2.17km NE of San Martin, CAThu, Nov 4, 5:32 PM PDT · 1795 days ago · 5 km deep · 91 km away
12. 2.61km W of Kensington, CAThu, Nov 4, 9:46 PM PDT · 1795 days ago · 5 km deep · 23 km away · felt by 1,893
13. 2.31km W of Kensington, CAFri, Nov 5, 2:32 AM PDT · 1795 days ago · 5 km deep · 23 km away · felt by 162
14. 1.810km ENE of Morgan Hill, CAFri, Nov 5, 10:58 AM PDT · 1795 days ago · 3 km deep · 88 km away
15. 2.05km E of Fremont, CAThu, Nov 11, 4:28 PM PST · 1788 days ago · 9 km deep · 35 km away · felt by 3
16. 1.67km E of Penngrove, CASat, Nov 13, 11:21 PM PST · 1786 days ago · 7 km deep · 69 km away · felt by 1
17. 1.714km E of Angwin, CAMon, Nov 15, 10:24 AM PST · 1785 days ago · 5 km deep · 83 km away
18. 1.710km NE of Napa, CAMon, Nov 15, 2:44 PM PST · 1784 days ago · 7 km deep · 59 km away
19. 3.91km NE of San Ramon, CAWed, Nov 17, 11:43 AM PST · 1782 days ago · 10 km deep · 9 km away · felt by 4,732
20. 3.22km NE of San Ramon, CAWed, Nov 17, 11:44 AM PST · 1782 days ago · 10 km deep · 9 km away
21. 2.51km NE of San Ramon, CAWed, Nov 17, 11:46 AM PST · 1782 days ago · 9 km deep · 9 km away · felt by 39
22. 2.11km NNE of San Ramon, CAWed, Nov 17, 11:50 AM PST · 1782 days ago · 10 km deep · 9 km away
23. 2.31km NE of San Ramon, CAWed, Nov 17, 11:53 AM PST · 1782 days ago · 9 km deep · 9 km away · felt by 3
24. 1.71km NE of San Ramon, CAWed, Nov 17, 11:57 AM PST · 1782 days ago · 9 km deep · 9 km away
25. 3.01km NE of San Ramon, CAWed, Nov 17, 11:58 AM PST · 1782 days ago · 9 km deep · 9 km away · felt by 259
26. 1.52km NE of San Ramon, CAWed, Nov 17, 12:01 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 1
27. 2.01km NE of San Ramon, CAWed, Nov 17, 12:06 PM PST · 1782 days ago · 9 km deep · 9 km away
28. 2.01km NE of San Ramon, CAWed, Nov 17, 12:16 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 19
29. 1.81km NE of San Ramon, CAWed, Nov 17, 12:17 PM PST · 1782 days ago · 10 km deep · 9 km away · felt by 5
30. 1.61km NE of San Ramon, CAWed, Nov 17, 12:23 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 4
31. 1.61km NE of San Ramon, CAWed, Nov 17, 12:27 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 8
32. 1.51km NE of San Ramon, CAWed, Nov 17, 12:34 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 1
33. 2.01km NE of San Ramon, CAWed, Nov 17, 1:35 PM PST · 1782 days ago · 9 km deep · 9 km away
34. 1.62km NE of San Ramon, CAWed, Nov 17, 3:53 PM PST · 1782 days ago · 9 km deep · 9 km away · felt by 2
35. 2.72km NE of San Ramon, CAWed, Nov 17, 4:01 PM PST · 1782 days ago · 10 km deep · 9 km away · felt by 88
36. 1.81km NE of San Ramon, CAThu, Nov 18, 6:04 AM PST · 1782 days ago · 9 km deep · 9 km away · felt by 3
37. 1.71km NE of San Ramon, CAThu, Nov 18, 6:17 AM PST · 1782 days ago · 9 km deep · 9 km away
38. 1.91km NE of San Ramon, CAFri, Nov 19, 3:58 AM PST · 1781 days ago · 10 km deep · 9 km away
39. 1.83km S of Dillon Beach, CAFri, Nov 19, 1:21 PM PST · 1780 days ago · 10 km deep · 90 km away
40. 2.44km S of Dillon Beach, CAFri, Nov 19, 2:22 PM PST · 1780 days ago · 10 km deep · 90 km away
41. 1.78km WSW of Mountain House, CAFri, Nov 19, 4:41 PM PST · 1780 days ago · 0 km deep · 37 km away
42. 1.75km E of Fremont, CASat, Nov 20, 8:43 AM PST · 1780 days ago · 9 km deep · 35 km away
43. 2.112km ENE of Morgan Hill, CASat, Nov 20, 5:24 PM PST · 1779 days ago · 4 km deep · 87 km away
44. 1.98km SSW of Brentwood, CASat, Nov 20, 7:27 PM PST · 1779 days ago · 19 km deep · 24 km away · felt by 1
45. 2.211km NW of Morgan Hill, CASat, Nov 20, 8:00 PM PST · 1779 days ago · 6 km deep · 75 km away · felt by 1
46. 1.97km ESE of Bethel Island, CASat, Nov 20, 8:33 PM PST · 1779 days ago · 9 km deep · 44 km away
47. 1.67km ENE of Kenwood, CASat, Nov 27, 4:15 AM PST · 1773 days ago · 7 km deep · 76 km away
48. 1.723km WNW of Bonny Doon, CASat, Nov 27, 4:17 PM PST · 1772 days ago · 7 km deep · 86 km away
49. 2.51km W of Kensington, CAMon, Nov 29, 7:30 PM PST · 1770 days ago · 5 km deep · 23 km away · felt by 965
50. 2.01km W of Kensington, CAMon, Nov 29, 7:37 PM PST · 1770 days ago · 5 km deep · 23 km away · felt by 43
51. 2.79km ENE of Morgan Hill, CATue, Nov 30, 8:07 AM PST · 1770 days ago · 2 km deep · 87 km away · felt by 38
52. 1.74km S of Portola Valley, CAThu, Dec 2, 6:32 PM PST · 1767 days ago · 6 km deep · 58 km away
53. 1.74km S of Portola Valley, CAThu, Dec 2, 7:22 PM PST · 1767 days ago · 6 km deep · 58 km away · felt by 1
54. 1.81km NE of San Ramon, CAFri, Dec 3, 11:25 PM PST · 1766 days ago · 9 km deep · 9 km away · felt by 1
55. 2.54km N of San Leandro, CASat, Dec 4, 6:08 PM PST · 1765 days ago · 3 km deep · 14 km away · felt by 150
56. 1.66km WSW of Colma, CAWed, Dec 8, 7:01 AM PST · 1762 days ago · 9 km deep · 47 km away · felt by 2
57. 2.22km E of Pacheco, CAWed, Dec 8, 9:21 AM PST · 1762 days ago · 16 km deep · 16 km away
58. 2.57km SW of Calistoga, CAFri, Dec 10, 8:17 AM PST · 1760 days ago · 7 km deep · 93 km away · felt by 30
59. 2.18km SW of Calistoga, CAFri, Dec 10, 2:13 PM PST · 1759 days ago · 8 km deep · 93 km away
60. 1.63km SSW of Half Moon Bay, CASun, Dec 12, 2:24 AM PST · 1758 days ago · 10 km deep · 57 km away

The first 60 of 70.

Before

1. 2.04km ENE of El Sobrante, CASat, Oct 23, 8:36 AM PDT · 1808 days ago · 9 km deep · 25 km away · felt by 2
2. 2.84km ENE of El Sobrante, CASat, Oct 23, 6:34 AM PDT · 1808 days ago · 10 km deep · 25 km away · felt by 328
3. 2.14km ENE of El Sobrante, CAFri, Oct 22, 7:52 AM PDT · 1809 days ago · 9 km deep · 25 km away · felt by 3
4. 1.610km NE of Milpitas, CATue, Oct 19, 10:35 PM PDT · 1811 days ago · 4 km deep · 43 km away
5. 1.91km S of San Ramon, CATue, Oct 19, 12:00 AM PDT · 1812 days ago · 8 km deep · 10 km away · felt by 4
6. 1.69km SE of Sunol, CAMon, Oct 18, 7:47 AM PDT · 1813 days ago · 9 km deep · 38 km away
7. 1.65km SW of Clayton, CAMon, Oct 18, 2:23 AM PDT · 1813 days ago · 10 km deep · 9 km away
8. 2.816km SSE of Livermore, CASat, Oct 16, 7:55 PM PDT · 1814 days ago · 3 km deep · 44 km away · felt by 70
9. 2.010km NNE of Angwin, CAThu, Oct 14, 3:20 PM PDT · 1816 days ago · 7 km deep · 96 km away
10. 2.13km WNW of Crockett, CATue, Oct 12, 10:20 AM PDT · 1819 days ago · 8 km deep · 30 km away · felt by 4
11. 1.63km W of Fruitdale, CAMon, Oct 11, 5:10 AM PDT · 1820 days ago · 5 km deep · 59 km away
12. 1.511km WSW of Saratoga, CASun, Oct 10, 12:35 PM PDT · 1820 days ago · 8 km deep · 68 km away
13. 1.611km WSW of Saratoga, CASun, Oct 10, 11:36 AM PDT · 1820 days ago · 8 km deep · 68 km away
14. 1.711km WSW of Saratoga, CASun, Oct 10, 12:47 AM PDT · 1821 days ago · 8 km deep · 68 km away
15. 1.612km W of Saratoga, CAFri, Oct 8, 3:58 PM PDT · 1822 days ago · 8 km deep · 67 km away
16. 1.64km SSW of San Francisco Zoo, CAThu, Oct 7, 10:36 PM PDT · 1823 days ago · 7 km deep · 45 km away · felt by 1
17. 2.14km WSW of Alamo, CAThu, Oct 7, 5:32 PM PDT · 1823 days ago · 15 km deep · 3 km away · felt by 3
18. 2.16km SSW of Moraga, CAThu, Oct 7, 1:21 AM PDT · 1824 days ago · 10 km deep · 12 km away · felt by 6
19. 2.16km SSW of Yountville, CAWed, Oct 6, 9:44 AM PDT · 1825 days ago · 8 km deep · 64 km away · felt by 4
20. 1.95km SW of Pacheco, CAWed, Oct 6, 7:33 AM PDT · 1825 days ago · 10 km deep · 14 km away · felt by 1

From the USGS Earthquake Hazards Program and its partner networks, event nc73643680. Read Mon, Oct 5, 2026, 5:55 AM UTC.