M2.3 earthquake 21km W of Petrolia, CA

Magnitude

2.3 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Jul 28, 2021, 2:43 AM PDT

UTC

2021-07-28 09:43:49 UTC

Depth

18.4 km (11.4 mi), shallow

Epicenter

40.291° N, 124.528° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 0.5 km in depth

Magnitude uncertainty

±0.38

Depth from

From location

Station coverage gap

246°, poorly surrounded by stations

Stations used

21

• Ferndale, CaliforniaPopulation 1,369. Forecast39 kmSW
• Fortuna, CaliforniaPopulation 12,000. Forecast46 kmSW
• Chico, CaliforniaPopulation 121,345. Forecast238 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast889 kmNW

After

1. 3.07km W of Petrolia, CAThu, Jul 29, 11:39 AM PDT · 1892 days ago · 29 km deep · 14 km away
2. 2.547km W of Ferndale, CAThu, Jul 29, 4:03 PM PDT · 1892 days ago · 24 km deep · 34 km away
3. 1.86km W of Petrolia, CAThu, Jul 29, 8:30 PM PDT · 1892 days ago · 28 km deep · 15 km away
4. 2.020km WSW of Petrolia, CAFri, Jul 30, 9:17 AM PDT · 1891 days ago · 18 km deep · 1 km away
5. 1.910km SSE of Redway, CAFri, Jul 30, 3:36 PM PDT · 1891 days ago · 17 km deep · 69 km away
6. 1.79km WSW of Petrolia, CASun, Aug 1, 7:00 AM PDT · 1890 days ago · 8 km deep · 12 km away
7. 2.818km W of Petrolia, CASun, Aug 1, 11:34 PM PDT · 1889 days ago · 33 km deep · 3 km away
8. 2.49km W of Petrolia, CAWed, Aug 4, 2:11 PM PDT · 1886 days ago · 29 km deep · 12 km away
9. 3.976km W of Petrolia, CAThu, Aug 5, 8:21 AM PDT · 1886 days ago · 8 km deep · 56 km away · felt by 2
10. 2.66km ENE of Petrolia, CAFri, Aug 6, 2:56 AM PDT · 1885 days ago · 29 km deep · 27 km away
11. 1.718km NNW of Laytonville, CAFri, Aug 6, 10:43 PM PDT · 1884 days ago · 5 km deep · 97 km away
12. 2.760km W of Ferndale, CASat, Aug 7, 5:57 AM PDT · 1884 days ago · 8 km deep · 54 km away
13. 2.35km W of Petrolia, CASat, Aug 7, 7:06 AM PDT · 1884 days ago · 27 km deep · 16 km away
14. 1.79km W of Petrolia, CASat, Aug 7, 9:49 AM PDT · 1883 days ago · 10 km deep · 12 km away
15. 2.06km WSW of Petrolia, CASat, Aug 7, 4:43 PM PDT · 1883 days ago · 31 km deep · 15 km away
16. 1.714km SE of Petrolia, CASun, Aug 8, 1:57 AM PDT · 1883 days ago · 12 km deep · 31 km away
17. 3.16km W of Petrolia, CASun, Aug 8, 3:40 AM PDT · 1883 days ago · 28 km deep · 15 km away · felt by 5
18. 2.08km W of Petrolia, CAMon, Aug 9, 5:31 AM PDT · 1882 days ago · 28 km deep · 14 km away
19. 2.98km W of Petrolia, CAMon, Aug 9, 7:03 PM PDT · 1881 days ago · 30 km deep · 14 km away
20. 2.988km W of Petrolia, CAWed, Aug 11, 8:00 AM PDT · 1880 days ago · 22 km deep · 69 km away
21. 1.811km WSW of Petrolia, CAWed, Aug 11, 2:01 PM PDT · 1879 days ago · 29 km deep · 12 km away
22. 2.910km WSW of Petrolia, CAThu, Aug 12, 1:03 AM PDT · 1879 days ago · 31 km deep · 12 km away · felt by 1
23. 2.66km WSW of Petrolia, CAThu, Aug 12, 9:11 PM PDT · 1878 days ago · 30 km deep · 15 km away · felt by 1
24. 1.910km NW of Petrolia, CAFri, Aug 13, 12:40 PM PDT · 1877 days ago · 23 km deep · 18 km away
25. 2.28km WSW of Petrolia, CAFri, Aug 13, 3:40 PM PDT · 1877 days ago · 29 km deep · 13 km away
26. 2.036km WNW of Petrolia, CASun, Aug 15, 1:14 AM PDT · 1876 days ago · 8 km deep · 19 km away
27. 1.816km W of Petrolia, CAMon, Aug 16, 5:20 AM PDT · 1875 days ago · 11 km deep · 5 km away
28. 2.113km ESE of Redway, CAWed, Aug 18, 6:04 AM PDT · 1873 days ago · 22 km deep · 75 km away
29. 2.58km W of Petrolia, CAThu, Aug 19, 4:33 PM PDT · 1871 days ago · 28 km deep · 14 km away
30. 3.16km W of Petrolia, CAFri, Aug 20, 11:01 AM PDT · 1870 days ago · 28 km deep · 15 km away · felt by 1
31. 2.955km WNW of Petrolia, CAFri, Aug 20, 11:45 AM PDT · 1870 days ago · 15 km deep · 37 km away
32. 1.620km W of Petrolia, CASat, Aug 21, 8:50 PM PDT · 1869 days ago · 15 km deep · 6 km away
33. 1.87km W of Petrolia, CASun, Aug 22, 9:20 AM PDT · 1868 days ago · 29 km deep · 14 km away
34. 2.44km W of Petrolia, CAWed, Aug 25, 1:42 AM PDT · 1866 days ago · 27 km deep · 17 km away
35. 1.712km SSW of Ferndale, CAThu, Aug 26, 11:32 AM PDT · 1864 days ago · 18 km deep · 27 km away
36. 1.712km SSW of Ferndale, CAThu, Aug 26, 12:23 PM PDT · 1864 days ago · 18 km deep · 27 km away
37. 2.432km W of Hayfork, CASat, Aug 28, 8:17 PM PDT · 1862 days ago · 24 km deep · 89 km away
38. 2.422km NW of Petrolia, CAMon, Aug 30, 12:17 AM PDT · 1861 days ago · 19 km deep · 19 km away
39. 4.011km WSW of Petrolia, CATue, Aug 31, 1:01 AM PDT · 1860 days ago · 32 km deep · 11 km away · felt by 8
40. 3.511km WSW of Petrolia, CATue, Aug 31, 1:01 AM PDT · 1860 days ago · 28 km deep · 12 km away
41. 1.819km NNW of Laytonville, CAThu, Sep 2, 8:17 AM PDT · 1858 days ago · 7 km deep · 94 km away
42. 2.48km W of Petrolia, CAThu, Sep 2, 4:59 PM PDT · 1857 days ago · 17 km deep · 14 km away
43. 2.650km W of Petrolia, CAFri, Sep 3, 3:25 AM PDT · 1857 days ago · 11 km deep · 31 km away
44. 2.37km W of Petrolia, CAFri, Sep 3, 3:18 PM PDT · 1856 days ago · 28 km deep · 14 km away
45. 1.86km W of Petrolia, CASat, Sep 4, 7:15 AM PDT · 1856 days ago · 28 km deep · 15 km away
46. 1.96km WSW of Petrolia, CASat, Sep 4, 8:10 AM PDT · 1856 days ago · 28 km deep · 15 km away
47. 2.58km WSW of Petrolia, CASun, Sep 5, 4:22 PM PDT · 1854 days ago · 29 km deep · 14 km away
48. 2.536km W of Petrolia, CATue, Sep 7, 7:35 AM PDT · 1853 days ago · 18 km deep · 17 km away
49. 3.3108km W of Petrolia, CATue, Sep 7, 10:39 AM PDT · 1852 days ago · 10 km deep · 88 km away · felt by 4
50. 1.59km WSW of Petrolia, CAThu, Sep 9, 10:39 AM PDT · 1850 days ago · 21 km deep · 13 km away
51. 4.510km SW of Petrolia, CAThu, Sep 9, 2:57 PM PDT · 1850 days ago · 33 km deep · 13 km away · felt by 39
52. 2.28km WSW of Petrolia, CAThu, Sep 9, 5:03 PM PDT · 1850 days ago · 31 km deep · 13 km away
53. 1.612km ENE of Hydesville, CAFri, Sep 10, 4:08 AM PDT · 1850 days ago · 25 km deep · 58 km away
54. 2.48km WSW of Petrolia, CAFri, Sep 10, 10:06 AM PDT · 1849 days ago · 29 km deep · 13 km away
55. 2.433km WNW of Petrolia, CAFri, Sep 10, 8:00 PM PDT · 1849 days ago · 22 km deep · 16 km away
56. 2.422km N of Laytonville, CASat, Sep 11, 7:25 AM PDT · 1849 days ago · 6 km deep · 97 km away · felt by 1
57. 2.58km SW of Petrolia, CASun, Sep 12, 6:54 AM PDT · 1848 days ago · 31 km deep · 14 km away
58. 2.325km WSW of Petrolia, CASun, Sep 12, 7:20 PM PDT · 1847 days ago · 21 km deep · 5 km away · felt by 1
59. 1.612km SE of Petrolia, CATue, Sep 14, 12:13 AM PDT · 1846 days ago · 11 km deep · 29 km away
60. 2.68km WSW of Petrolia, CAThu, Sep 16, 1:37 AM PDT · 1844 days ago · 30 km deep · 13 km away · felt by 1

The first 60 of 70.

Before

1. 2.56km N of Petrolia, CATue, Jul 27, 11:52 PM PDT · 1894 days ago · 27 km deep · 23 km away
2. 2.89km W of Petrolia, CATue, Jul 27, 3:37 AM PDT · 1895 days ago · 28 km deep · 12 km away
3. 1.94km ESE of Redway, CAMon, Jul 26, 5:35 PM PDT · 1895 days ago · 21 km deep · 67 km away
4. 1.75km W of Petrolia, CAMon, Jul 26, 12:27 PM PDT · 1895 days ago · 29 km deep · 16 km away
5. 2.78km W of Petrolia, CASun, Jul 25, 4:20 PM PDT · 1896 days ago · 29 km deep · 13 km away
6. 2.18km W of Petrolia, CASun, Jul 25, 1:05 PM PDT · 1896 days ago · 29 km deep · 14 km away
7. 2.912km WSW of Petrolia, CASat, Jul 24, 4:06 PM PDT · 1897 days ago · 32 km deep · 9 km away · felt by 1
8. 2.77km W of Petrolia, CAFri, Jul 23, 1:09 PM PDT · 1898 days ago · 29 km deep · 14 km away · felt by 2
9. 2.733km WNW of Petrolia, CAThu, Jul 22, 8:42 PM PDT · 1899 days ago · 23 km deep · 17 km away
10. 2.5112 km W of Ferndale, CaliforniaWed, Jul 21, 10:50 PM PDT · 1900 days ago · 10 km deep · 91 km away
11. 1.733km ENE of Hydesville, CAWed, Jul 21, 6:25 AM PDT · 1901 days ago · 26 km deep · 78 km away
12. 2.840km WNW of Petrolia, CAWed, Jul 21, 5:25 AM PDT · 1901 days ago · 24 km deep · 24 km away
13. 1.716km SW of Ferndale, CAWed, Jul 21, 3:45 AM PDT · 1901 days ago · 25 km deep · 23 km away
14. 2.856km WNW of Petrolia, CAWed, Jul 21, 3:36 AM PDT · 1901 days ago · 15 km deep · 37 km away · felt by 3
15. 4.312km WSW of Petrolia, CAWed, Jul 21, 3:05 AM PDT · 1901 days ago · 35 km deep · 10 km away · felt by 25
16. 2.519km SE of Bayside, CATue, Jul 20, 6:57 PM PDT · 1901 days ago · 25 km deep · 71 km away
17. 1.69km SSE of Redway, CATue, Jul 20, 2:28 AM PDT · 1902 days ago · 19 km deep · 69 km away
18. 2.14km SW of Petrolia, CASun, Jul 18, 12:38 AM PDT · 1904 days ago · 31 km deep · 17 km away
19. 2.49km W of Petrolia, CASun, Jul 18, 12:05 AM PDT · 1904 days ago · 29 km deep · 12 km away · felt by 7
20. 5.112km W of Petrolia, CASat, Jul 17, 11:46 PM PDT · 1904 days ago · 31 km deep · 9 km away · felt by 751

From the USGS Earthquake Hazards Program and its partner networks, event nc73600826. Read Sun, Oct 4, 2026, 3:10 AM UTC.