M1.8 earthquake 4km NNE of Hamilton City, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Sep 4, 2021, 11:30 AM PDT

UTC

2021-09-04 18:30:18 UTC

Depth

13.7 km (8.5 mi), shallow

Epicenter

39.781° N, 121.995° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 1.3 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

75°

Stations used

11

• Hamilton City, CaliforniaPopulation 1,759. Forecast4 kmNNE
• Chico, CaliforniaPopulation 121,345. Forecast15 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast719 kmNNW

After

1. 1.61km SW of Palo Cedro, CAMon, Sep 6, 9:04 AM PDT · 1854 days ago · 13 km deep · 89 km away
2. 1.51km NW of Palo Cedro, CAMon, Sep 6, 8:45 PM PDT · 1853 days ago · 15 km deep · 90 km away
3. 1.51km NW of Palo Cedro, CATue, Sep 7, 4:15 PM PDT · 1853 days ago · 16 km deep · 90 km away
4. 1.912km ESE of Viola, CAWed, Sep 8, 12:40 PM PDT · 1852 days ago · 5 km deep · 87 km away
5. 1.615km NNE of Mineral, CASat, Sep 11, 2:16 AM PDT · 1849 days ago · 3 km deep · 89 km away
6. 2.10km S of Palo Cedro, CASun, Sep 12, 1:49 PM PDT · 1848 days ago · 15 km deep · 89 km away · felt by 1
7. 1.72km SW of Palo Cedro, CAMon, Sep 13, 9:51 AM PDT · 1847 days ago · 14 km deep · 89 km away
8. 2.01km WNW of Stony Gorge Reservoir, CAThu, Sep 16, 8:47 AM PDT · 1844 days ago · 13 km deep · 52 km away
9. 1.714km SE of Lake Pillsbury, CAThu, Sep 16, 7:21 PM PDT · 1843 days ago · 1 km deep · 91 km away
10. 2.55km NNE of Hamilton City, CAFri, Sep 17, 10:07 AM PDT · 1843 days ago · 19 km deep · 1 km away · felt by 1
11. 1.913km W of Alder Springs, CAFri, Sep 17, 10:11 PM PDT · 1842 days ago · 0 km deep · 77 km away
12. 1.96km ESE of Lake Pillsbury, CASat, Sep 18, 12:52 AM PDT · 1842 days ago · 5 km deep · 90 km away
13. 2.56km NW of Chico, CASun, Sep 19, 5:27 AM PDT · 1841 days ago · 29 km deep · 9 km away
14. 1.86km SE of Lake Pillsbury, CATue, Sep 21, 11:25 PM PDT · 1838 days ago · 2 km deep · 90 km away
15. 1.910km WSW of Chester, CAThu, Sep 23, 2:43 AM PDT · 1837 days ago · 9 km deep · 78 km away
16. 1.56km NNE of Millville, CAFri, Sep 24, 11:39 AM PDT · 1836 days ago · 13 km deep · 93 km away
17. 2.322km N of Lake Pillsbury, CASat, Sep 25, 9:16 PM PDT · 1834 days ago · 13 km deep · 88 km away · felt by 2
18. 2.24km ENE of Prattville, CASun, Sep 26, 12:44 AM PDT · 1834 days ago · 8 km deep · 89 km away
19. 1.814km SE of Lake Pillsbury, CAWed, Sep 29, 12:56 AM PDT · 1831 days ago · 7 km deep · 89 km away
20. 1.512km ESE of Viola, CAWed, Sep 29, 2:22 PM PDT · 1831 days ago · 3 km deep · 85 km away
21. 1.816km NE of Upper Lake, CAThu, Sep 30, 3:39 AM PDT · 1830 days ago · -1 km deep · 88 km away
22. 2.09km WSW of Chester, CAThu, Sep 30, 6:37 AM PDT · 1830 days ago · 1 km deep · 79 km away
23. 1.512km ESE of Viola, CAFri, Oct 1, 7:13 AM PDT · 1829 days ago · 4 km deep · 85 km away
24. 1.99km WSW of Chester, CAFri, Oct 1, 12:38 PM PDT · 1829 days ago · 4 km deep · 79 km away
25. 2.12km NW of Bella Vista, CASat, Oct 2, 12:04 PM PDT · 1828 days ago · 26 km deep · 100 km away
26. 1.84km E of Shasta, CATue, Oct 5, 4:00 AM PDT · 1825 days ago · 21 km deep · 99 km away
27. 1.912km SE of Covelo, CAWed, Oct 6, 3:50 PM PDT · 1824 days ago · -1 km deep · 100 km away
28. 2.54km ENE of Shasta, CAWed, Oct 6, 7:18 PM PDT · 1823 days ago · 22 km deep · 100 km away · felt by 3
29. 2.010km N of Lake Pillsbury, CAWed, Oct 6, 11:55 PM PDT · 1823 days ago · 8 km deep · 89 km away
30. 1.74km ENE of Shasta, CAFri, Oct 8, 1:06 PM PDT · 1822 days ago · 21 km deep · 100 km away
31. 1.811km N of Lake Pillsbury, CASun, Oct 10, 2:40 PM PDT · 1820 days ago · 4 km deep · 88 km away · felt by 2
32. 2.111km N of Lake Pillsbury, CASun, Oct 10, 7:52 PM PDT · 1819 days ago · 6 km deep · 89 km away
33. 2.011km N of Lake Pillsbury, CAMon, Oct 11, 10:38 AM PDT · 1819 days ago · 7 km deep · 89 km away
34. 1.914km ESE of Lake Pillsbury, CATue, Oct 12, 6:07 PM PDT · 1818 days ago · 0 km deep · 85 km away
35. 1.616km N of Shingletown, CAWed, Oct 13, 7:24 AM PDT · 1817 days ago · 11 km deep · 95 km away · felt by 1
36. 2.412km N of Lake Pillsbury, CAWed, Oct 13, 9:17 AM PDT · 1817 days ago · 8 km deep · 89 km away · felt by 2
37. 1.913km WSW of Almanor, CAWed, Oct 13, 1:01 PM PDT · 1817 days ago · 9 km deep · 72 km away
38. 2.96km NNE of Hamilton City, CASun, Oct 17, 9:50 AM PDT · 1813 days ago · 17 km deep · 1 km away
39. 2.26km NW of Redding, CAWed, Oct 20, 2:46 AM PDT · 1810 days ago · 20 km deep · 99 km away
40. 1.814km ESE of Lake Pillsbury, CAWed, Oct 20, 5:28 PM PDT · 1810 days ago · 7 km deep · 85 km away
41. 2.114km ESE of Viola, CAMon, Oct 25, 9:48 PM PDT · 1804 days ago · 4 km deep · 87 km away
42. 1.718km SE of Lake Pillsbury, CATue, Oct 26, 1:45 PM PDT · 1804 days ago · 5 km deep · 87 km away
43. 2.13km NNE of Chester, CAWed, Oct 27, 10:13 PM PDT · 1802 days ago · 8 km deep · 90 km away
44. 1.83km NNE of Chester, CAThu, Oct 28, 6:08 PM PDT · 1802 days ago · 10 km deep · 90 km away
45. 2.75km ENE of East Quincy, CAFri, Oct 29, 3:26 PM PDT · 1801 days ago · 5 km deep · 100 km away · felt by 7
46. 2.13km NNE of Chester, CATue, Nov 2, 10:40 PM PDT · 1796 days ago · 9 km deep · 90 km away

Before

1. 1.813km WNW of Alder Springs, CAFri, Sep 3, 11:05 AM PDT · 1857 days ago · 3 km deep · 76 km away
2. 1.72km WSW of Palo Cedro, CAFri, Sep 3, 2:51 AM PDT · 1857 days ago · 18 km deep · 89 km away
3. 1.95km N of Lake Wildwood, CAMon, Aug 30, 10:10 PM PDT · 1860 days ago · 1 km deep · 88 km away · felt by 3
4. 2.514km W of Williams, CAMon, Aug 30, 2:38 PM PDT · 1861 days ago · 21 km deep · 73 km away
5. 1.62km W of Palo Cedro, CASun, Aug 29, 10:18 PM PDT · 1861 days ago · 14 km deep · 90 km away
6. 1.56km ESE of Bella Vista, CATue, Aug 24, 11:09 PM PDT · 1866 days ago · 14 km deep · 94 km away
7. 1.813km W of Alder Springs, CATue, Aug 24, 1:26 AM PDT · 1867 days ago · 2 km deep · 76 km away · felt by 1
8. 1.914km S of Hamilton City, CAMon, Aug 23, 9:08 PM PDT · 1867 days ago · 22 km deep · 19 km away
9. 1.63km S of East Shore, CASat, Aug 21, 2:12 PM PDT · 1870 days ago · 6 km deep · 92 km away
10. 2.112km WNW of Alder Springs, CAFri, Aug 20, 5:58 AM PDT · 1871 days ago · 3 km deep · 75 km away
11. 1.99km W of Caribou, CAThu, Aug 19, 9:51 PM PDT · 1871 days ago · 9 km deep · 71 km away
12. 1.615km SSW of Mineral, CAThu, Aug 19, 3:29 AM PDT · 1872 days ago · 5 km deep · 59 km away
13. 1.615km SSW of Mineral, CAThu, Aug 19, 3:24 AM PDT · 1872 days ago · 4 km deep · 59 km away
14. 1.610km NNE of Mineral, CATue, Aug 17, 6:37 AM PDT · 1874 days ago · 3 km deep · 84 km away
15. 1.611km NNE of Mineral, CAMon, Aug 16, 11:54 PM PDT · 1874 days ago · 4 km deep · 85 km away
16. 1.711km NNE of Mineral, CAMon, Aug 16, 11:51 PM PDT · 1874 days ago · 4 km deep · 85 km away
17. 1.510km NNE of Mineral, CAMon, Aug 16, 11:47 PM PDT · 1874 days ago · 2 km deep · 84 km away
18. 1.910km NNE of Mineral, CAMon, Aug 16, 11:47 PM PDT · 1874 days ago · 3 km deep · 84 km away
19. 1.911km NNE of Mineral, CAMon, Aug 16, 11:47 PM PDT · 1874 days ago · 4 km deep · 84 km away
20. 1.610km N of Lake Pillsbury, CASun, Aug 15, 10:44 PM PDT · 1875 days ago · 7 km deep · 87 km away · felt by 1

From the USGS Earthquake Hazards Program and its partner networks, event nc73620116. Read Sun, Oct 4, 2026, 1:45 PM UTC.