M1.5 earthquake 2km S of Alamo, CA

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Dec 30, 2021, 4:12 PM PST

UTC

2021-12-31 00:12:38 UTC

Depth

9.5 km (5.9 mi), shallow

Epicenter

37.834° N, 122.036° W

Region

California

Felt reports

3

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.2 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

39°

Stations used

42

• Alamo, CaliforniaPopulation 14,570. Forecast2 kmSSW
• Concord, CaliforniaPopulation 128,667. Forecast16 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast542 kmNW

After

1. 1.56km W of Kenwood, CAThu, Dec 30, 11:05 PM PST · 1738 days ago · 6 km deep · 82 km away
2. 1.65km NE of Larkfield-Wikiup, CASat, Jan 1, 2:09 AM PST · 1737 days ago · 6 km deep · 99 km away
3. 2.19km E of Alum Rock, CASun, Jan 2, 5:42 AM PST · 1736 days ago · 9 km deep · 58 km away
4. 1.510km ENE of Milpitas, CAMon, Jan 3, 8:47 AM PST · 1735 days ago · 8 km deep · 45 km away
5. 2.62km SW of Colma, CATue, Jan 4, 3:18 AM PST · 1734 days ago · 8 km deep · 43 km away
6. 2.16km ENE of Kenwood, CAWed, Jan 5, 7:57 AM PST · 1733 days ago · 9 km deep · 78 km away
7. 2.05km W of Yountville, CAFri, Jan 7, 10:42 AM PST · 1731 days ago · 6 km deep · 71 km away
8. 1.711km NE of Milpitas, CASat, Jan 8, 9:54 AM PST · 1730 days ago · 4 km deep · 42 km away
9. 1.52km NE of Union City, CASat, Jan 8, 6:39 PM PST · 1730 days ago · 5 km deep · 26 km away
10. 1.75km WSW of Pacheco, CAMon, Jan 10, 3:05 PM PST · 1728 days ago · 9 km deep · 16 km away
11. 1.54km WSW of Colma, CAWed, Jan 12, 4:29 PM PST · 1726 days ago · 9 km deep · 45 km away
12. 1.61km NE of San Ramon, CAWed, Jan 12, 9:16 PM PST · 1725 days ago · 10 km deep · 8 km away
13. 2.111km SSW of Brentwood, CAThu, Jan 13, 1:57 PM PST · 1725 days ago · 18 km deep · 24 km away
14. 2.46km N of Diablo, CAThu, Jan 13, 5:21 PM PST · 1725 days ago · 13 km deep · 8 km away · felt by 25
15. 1.62km NNE of San Ramon, CASat, Jan 15, 9:15 AM PST · 1723 days ago · 11 km deep · 7 km away · felt by 2
16. 1.98km E of Fremont, CASat, Jan 15, 2:24 PM PST · 1723 days ago · 7 km deep · 36 km away · felt by 3
17. 1.712km NNE of Angwin, CAMon, Jan 17, 4:24 AM PST · 1721 days ago · 8 km deep · 99 km away
18. 1.65km N of Lafayette, CAFri, Jan 21, 11:21 AM PST · 1717 days ago · 6 km deep · 13 km away
19. 1.64km N of Lafayette, CAFri, Jan 21, 3:37 PM PST · 1717 days ago · 5 km deep · 12 km away · felt by 1
20. 2.25km WNW of Dublin, CAFri, Jan 21, 3:41 PM PST · 1717 days ago · 6 km deep · 13 km away · felt by 12
21. 1.96km WNW of Dublin, CAFri, Jan 21, 3:56 PM PST · 1717 days ago · 8 km deep · 13 km away · felt by 2
22. 1.61km NE of Byron, CASun, Jan 23, 8:55 AM PST · 1715 days ago · 4 km deep · 36 km away
23. 1.51km SE of Pacifica, CAMon, Jan 24, 7:24 AM PST · 1714 days ago · 8 km deep · 46 km away
24. 1.52km NNW of Green Valley, CAMon, Jan 24, 11:55 AM PST · 1714 days ago · 6 km deep · 50 km away
25. 1.612km SW of Mountain House, CATue, Jan 25, 6:19 AM PST · 1713 days ago · 18 km deep · 40 km away
26. 1.512km SW of Mountain House, CATue, Jan 25, 6:19 AM PST · 1713 days ago · 18 km deep · 39 km away
27. 1.93km WSW of American Canyon, CATue, Jan 25, 5:30 PM PST · 1713 days ago · 7 km deep · 43 km away
28. 1.610km NNE of Morgan Hill, CAThu, Jan 27, 2:42 AM PST · 1711 days ago · 3 km deep · 80 km away · felt by 1
29. 1.916km E of Seven Trees, CAThu, Jan 27, 5:04 PM PST · 1711 days ago · 4 km deep · 69 km away
30. 2.23km NNW of Diablo, CASun, Feb 6, 2:00 PM PST · 1701 days ago · 9 km deep · 6 km away · felt by 5
31. 3.12km ENE of San Leandro, CASun, Feb 6, 4:01 PM PST · 1701 days ago · 4 km deep · 15 km away · felt by 1,429
32. 1.85km NW of Pittsburg, CASun, Feb 6, 7:25 PM PST · 1700 days ago · 21 km deep · 28 km away · felt by 2
33. 2.716km E of Seven Trees, CAMon, Feb 7, 8:38 AM PST · 1700 days ago · 5 km deep · 69 km away · felt by 37
34. 1.95km SE of Brentwood, CAThu, Feb 10, 11:48 PM PST · 1696 days ago · 16 km deep · 31 km away
35. 1.75km WNW of Byron, CAFri, Feb 11, 12:00 AM PST · 1696 days ago · 15 km deep · 32 km away
36. 1.65km WNW of Byron, CAFri, Feb 11, 1:54 AM PST · 1696 days ago · 16 km deep · 31 km away
37. 3.22km NNE of San Leandro, CAFri, Feb 11, 7:13 PM PST · 1695 days ago · 4 km deep · 14 km away · felt by 1,117
38. 1.62km ENE of Pacifica, CASat, Feb 12, 11:56 PM PST · 1694 days ago · 12 km deep · 45 km away
39. 1.64km N of Inverness, CATue, Feb 15, 9:09 AM PST · 1692 days ago · 13 km deep · 79 km away
40. 2.93km ENE of San Leandro, CAWed, Feb 16, 6:21 AM PST · 1691 days ago · 6 km deep · 14 km away · felt by 414
41. 1.83km ENE of San Leandro, CAWed, Feb 16, 7:57 AM PST · 1691 days ago · 6 km deep · 13 km away
42. 1.62km NE of Union City, CAFri, Feb 18, 8:52 PM PST · 1688 days ago · 5 km deep · 26 km away · felt by 2
43. 1.55km WSW of Daly City, CAFri, Feb 18, 11:30 PM PST · 1688 days ago · 8 km deep · 46 km away
44. 1.72km SSW of Blackhawk, CAFri, Feb 18, 11:51 PM PST · 1688 days ago · 9 km deep · 11 km away · felt by 1
45. 1.98km E of Alum Rock, CASun, Feb 20, 9:57 PM PST · 1686 days ago · 7 km deep · 57 km away
46. 1.93km ESE of Pacheco, CASat, Feb 26, 6:33 AM PST · 1681 days ago · 16 km deep · 16 km away · felt by 4
47. 1.912km ESE of Alum Rock, CASun, Feb 27, 12:05 AM PST · 1680 days ago · 8 km deep · 63 km away
48. 1.64km E of South San Francisco, CAMon, Feb 28, 1:35 PM PST · 1679 days ago · 10 km deep · 35 km away · felt by 1

Before

1. 1.75km NE of Larkfield-Wikiup, CAWed, Dec 29, 5:11 PM PST · 1740 days ago · 8 km deep · 99 km away
2. 2.34km NE of Fairview, CATue, Dec 28, 8:58 PM PST · 1740 days ago · 7 km deep · 14 km away · felt by 27
3. 1.85km NNE of Alum Rock, CAFri, Dec 24, 9:15 PM PST · 1744 days ago · 0 km deep · 51 km away · felt by 5
4. 1.62km NE of San Ramon, CAThu, Dec 23, 4:30 AM PST · 1746 days ago · 10 km deep · 8 km away · felt by 2
5. 1.91km NW of Danville, CAWed, Dec 22, 3:57 AM PST · 1747 days ago · 8 km deep · 3 km away · felt by 3
6. 1.71km WNW of Danville, CATue, Dec 21, 10:33 PM PST · 1747 days ago · 8 km deep · 3 km away · felt by 2
7. 2.01km N of Pacifica, CASun, Dec 19, 10:02 PM PST · 1749 days ago · 8 km deep · 46 km away · felt by 14
8. 2.010km E of Alum Rock, CASat, Dec 18, 11:21 AM PST · 1751 days ago · 9 km deep · 60 km away
9. 1.89km NE of Morgan Hill, CATue, Dec 14, 6:31 PM PST · 1755 days ago · 2 km deep · 83 km away
10. 1.63km SSW of Half Moon Bay, CATue, Dec 14, 2:02 AM PST · 1755 days ago · 10 km deep · 57 km away
11. 2.32km SW of Discovery Bay, CAMon, Dec 13, 4:01 PM PST · 1756 days ago · 18 km deep · 38 km away
12. 2.23km SSW of Half Moon Bay, CAMon, Dec 13, 1:48 PM PST · 1756 days ago · 10 km deep · 57 km away
13. 1.63km SE of Concord, CAMon, Dec 13, 10:51 AM PST · 1756 days ago · 12 km deep · 13 km away
14. 1.67km WSW of Lagunitas-Forest Knolls, CAMon, Dec 13, 6:35 AM PST · 1756 days ago · 5 km deep · 66 km away
15. 1.63km SSW of Half Moon Bay, CASun, Dec 12, 2:24 AM PST · 1757 days ago · 10 km deep · 57 km away
16. 2.18km SW of Calistoga, CAFri, Dec 10, 2:13 PM PST · 1759 days ago · 8 km deep · 94 km away
17. 2.57km SW of Calistoga, CAFri, Dec 10, 8:17 AM PST · 1759 days ago · 7 km deep · 94 km away · felt by 30
18. 2.22km E of Pacheco, CAWed, Dec 8, 9:21 AM PST · 1761 days ago · 16 km deep · 17 km away
19. 1.66km WSW of Colma, CAWed, Dec 8, 7:01 AM PST · 1761 days ago · 9 km deep · 47 km away · felt by 2
20. 2.54km N of San Leandro, CASat, Dec 4, 6:08 PM PST · 1765 days ago · 3 km deep · 13 km away · felt by 150

From the USGS Earthquake Hazards Program and its partner networks, event nc73669346. Read Sun, Oct 4, 2026, 2:17 PM UTC.