M1.9 earthquake 8km N of Petrolia, CA

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Dec 20, 2021, 4:57 PM PST

UTC

2021-12-21 00:57:52 UTC

Depth

24.2 km (15.1 mi), shallow

Epicenter

40.394° N, 124.288° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.8 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

207°, poorly surrounded by stations

Stations used

14

• Scotia, CaliforniaPopulation 850. Forecast19 kmWSW
• Fortuna, CaliforniaPopulation 12,000. Forecast25 kmSSW
• Chico, CaliforniaPopulation 121,345. Forecast221 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast885 kmNW

After

1. 2.38km NNE of Petrolia, CAMon, Dec 20, 5:16 PM PST · 1749 days ago · 24 km deep · 2 km away
2. 1.820km SSE of Rio Dell, CAMon, Dec 20, 5:16 PM PST · 1749 days ago · 29 km deep · 22 km away
3. 2.46km N of Petrolia, CAMon, Dec 20, 5:20 PM PST · 1749 days ago · 25 km deep · 1 km away
4. 2.815km WSW of Petrolia, CAMon, Dec 20, 5:44 PM PST · 1749 days ago · 20 km deep · 19 km away
5. 1.69km NNE of Petrolia, CAMon, Dec 20, 6:25 PM PST · 1749 days ago · 23 km deep · 4 km away
6. 2.89km NNE of Petrolia, CAMon, Dec 20, 6:31 PM PST · 1749 days ago · 23 km deep · 4 km away
7. 2.57km N of Petrolia, CAMon, Dec 20, 6:34 PM PST · 1749 days ago · 25 km deep · 1 km away
8. 2.69km N of Petrolia, CAMon, Dec 20, 6:46 PM PST · 1749 days ago · 27 km deep · 2 km away
9. 2.744km WNW of Petrolia, CAMon, Dec 20, 6:48 PM PST · 1749 days ago · 17 km deep · 42 km away
10. 2.713km WSW of Rio Dell, CAMon, Dec 20, 7:18 PM PST · 1749 days ago · 27 km deep · 7 km away
11. 3.810km NNE of Petrolia, CAMon, Dec 20, 7:26 PM PST · 1749 days ago · 27 km deep · 5 km away · felt by 4
12. 2.817km NNW of Petrolia, CAMon, Dec 20, 7:44 PM PST · 1749 days ago · 23 km deep · 11 km away · felt by 2
13. 2.818km NW of Petrolia, CAMon, Dec 20, 8:13 PM PST · 1749 days ago · 24 km deep · 12 km away
14. 3.814km N of Petrolia, CAMon, Dec 20, 8:34 PM PST · 1749 days ago · 28 km deep · 6 km away · felt by 4
15. 2.225km W of Petrolia, CAMon, Dec 20, 9:15 PM PST · 1749 days ago · 19 km deep · 27 km away · felt by 1
16. 2.313km N of Petrolia, CAMon, Dec 20, 9:41 PM PST · 1749 days ago · 25 km deep · 5 km away
17. 2.730km W of Petrolia, CAMon, Dec 20, 9:53 PM PST · 1749 days ago · 21 km deep · 31 km away
18. 2.07km N of Petrolia, CATue, Dec 21, 1:17 AM PST · 1749 days ago · 25 km deep · 1 km away
19. 1.65km E of Petrolia, CATue, Dec 21, 1:27 AM PST · 1749 days ago · 22 km deep · 10 km away
20. 2.27km WSW of Petrolia, CATue, Dec 21, 1:39 AM PST · 1749 days ago · 20 km deep · 12 km away
21. 2.774 km WSW of Ferndale, CaliforniaTue, Dec 21, 2:57 AM PST · 1749 days ago · 10 km deep · 67 km away
22. 2.828km W of Petrolia, CATue, Dec 21, 3:42 AM PST · 1749 days ago · 17 km deep · 30 km away
23. 1.67km S of Ferndale, CATue, Dec 21, 4:13 AM PST · 1748 days ago · 23 km deep · 14 km away
24. 1.812km SSW of Ferndale, CATue, Dec 21, 4:37 AM PST · 1748 days ago · 19 km deep · 9 km away
25. 1.610km SSW of Ferndale, CATue, Dec 21, 4:37 AM PST · 1748 days ago · 23 km deep · 10 km away
26. 1.68km N of Petrolia, CATue, Dec 21, 5:01 AM PST · 1748 days ago · 25 km deep · 0 km away
27. 2.656km WNW of Ferndale, CATue, Dec 21, 5:27 AM PST · 1748 days ago · 18 km deep · 63 km away
28. 2.732km W of Petrolia, CATue, Dec 21, 5:50 AM PST · 1748 days ago · 20 km deep · 33 km away
29. 2.97km N of Petrolia, CATue, Dec 21, 6:09 AM PST · 1748 days ago · 25 km deep · 1 km away
30. 2.317km WSW of Petrolia, CATue, Dec 21, 6:13 AM PST · 1748 days ago · 20 km deep · 20 km away
31. 3.212km SSW of Ferndale, CATue, Dec 21, 6:16 AM PST · 1748 days ago · 28 km deep · 8 km away · felt by 11
32. 2.414km S of Ferndale, CATue, Dec 21, 6:54 AM PST · 1748 days ago · 26 km deep · 7 km away
33. 1.84km ENE of Petrolia, CATue, Dec 21, 7:49 AM PST · 1748 days ago · 23 km deep · 7 km away
34. 2.811km N of Petrolia, CATue, Dec 21, 8:50 AM PST · 1748 days ago · 24 km deep · 3 km away · felt by 5
35. 3.230km W of Petrolia, CATue, Dec 21, 9:24 AM PST · 1748 days ago · 21 km deep · 31 km away · felt by 2
36. 2.838km WNW of Petrolia, CATue, Dec 21, 1:35 PM PST · 1748 days ago · 22 km deep · 37 km away
37. 2.825km W of Petrolia, CATue, Dec 21, 3:08 PM PST · 1748 days ago · 20 km deep · 27 km away · felt by 2
38. 1.85km NNE of Petrolia, CATue, Dec 21, 10:31 PM PST · 1748 days ago · 24 km deep · 5 km away
39. 1.810km N of Petrolia, CATue, Dec 21, 10:51 PM PST · 1748 days ago · 27 km deep · 3 km away
40. 1.611km SW of Rio Dell, CAWed, Dec 22, 12:41 AM PST · 1748 days ago · 25 km deep · 9 km away
41. 1.713km NNE of Petrolia, CAWed, Dec 22, 3:37 AM PST · 1748 days ago · 26 km deep · 6 km away
42. 2.57km NNE of Petrolia, CAWed, Dec 22, 10:39 AM PST · 1747 days ago · 25 km deep · 2 km away
43. 2.611km WSW of Petrolia, CAWed, Dec 22, 1:36 PM PST · 1747 days ago · 28 km deep · 16 km away
44. 2.714km S of Ferndale, CAWed, Dec 22, 5:13 PM PST · 1747 days ago · 26 km deep · 7 km away · felt by 1
45. 2.910km WSW of Petrolia, CAWed, Dec 22, 5:47 PM PST · 1747 days ago · 31 km deep · 15 km away · felt by 1
46. 3.96km N of Petrolia, CAWed, Dec 22, 7:28 PM PST · 1747 days ago · 21 km deep · 2 km away · felt by 77
47. 2.213km WSW of Petrolia, CAThu, Dec 23, 12:27 AM PST · 1747 days ago · 35 km deep · 17 km away
48. 3.26km W of Petrolia, CAThu, Dec 23, 3:24 AM PST · 1747 days ago · 31 km deep · 10 km away · felt by 3
49. 2.540km W of Petrolia, CAThu, Dec 23, 8:25 AM PST · 1746 days ago · 11 km deep · 41 km away
50. 2.915km NW of Petrolia, CAThu, Dec 23, 10:32 AM PST · 1746 days ago · 27 km deep · 9 km away
51. 2.97km WSW of Petrolia, CAThu, Dec 23, 10:55 AM PST · 1746 days ago · 30 km deep · 12 km away · felt by 2
52. 2.411km WSW of Petrolia, CAThu, Dec 23, 10:57 AM PST · 1746 days ago · 29 km deep · 16 km away
53. 2.19km NNE of Petrolia, CAThu, Dec 23, 11:29 AM PST · 1746 days ago · 25 km deep · 3 km away
54. 2.66km NNW of Petrolia, CAThu, Dec 23, 4:14 PM PST · 1746 days ago · 29 km deep · 3 km away
55. 2.55km N of Petrolia, CAThu, Dec 23, 4:20 PM PST · 1746 days ago · 26 km deep · 3 km away
56. 2.649km W of Petrolia, CAThu, Dec 23, 5:34 PM PST · 1746 days ago · 2 km deep · 50 km away
57. 2.411km SW of Petrolia, CAThu, Dec 23, 6:53 PM PST · 1746 days ago · 20 km deep · 16 km away
58. 2.734km W of Petrolia, CAThu, Dec 23, 8:29 PM PST · 1746 days ago · 23 km deep · 35 km away · felt by 1
59. 2.736km W of Petrolia, CAThu, Dec 23, 8:39 PM PST · 1746 days ago · 22 km deep · 37 km away
60. 3.19km WSW of Petrolia, CAFri, Dec 24, 4:58 AM PST · 1745 days ago · 31 km deep · 13 km away · felt by 1

The first 60 of 176.

Before

1. 2.28km NNE of Petrolia, CAMon, Dec 20, 4:51 PM PST · 1749 days ago · 25 km deep · 2 km away
2. 2.557km WNW of Petrolia, CAMon, Dec 20, 4:51 PM PST · 1749 days ago · 8 km deep · 55 km away
3. 2.66km SE of Ferndale, CAMon, Dec 20, 4:26 PM PST · 1749 days ago · 26 km deep · 18 km away
4. 2.627km W of Petrolia, CAMon, Dec 20, 4:12 PM PST · 1749 days ago · 19 km deep · 29 km away
5. 2.88km NNE of Petrolia, CAMon, Dec 20, 4:10 PM PST · 1749 days ago · 23 km deep · 4 km away
6. 2.311km SSW of Ferndale, CAMon, Dec 20, 4:05 PM PST · 1749 days ago · 19 km deep · 10 km away
7. 3.08km SSW of Ferndale, CAMon, Dec 20, 3:40 PM PST · 1749 days ago · 18 km deep · 12 km away · felt by 1
8. 1.79km SSW of Ferndale, CAMon, Dec 20, 3:40 PM PST · 1749 days ago · 18 km deep · 12 km away
9. 1.814km N of Petrolia, CAMon, Dec 20, 3:27 PM PST · 1749 days ago · 23 km deep · 7 km away
10. 1.97km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 26 km deep · 1 km away
11. 2.814km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 23 km deep · 6 km away
12. 2.311km SSW of Ferndale, CAMon, Dec 20, 3:21 PM PST · 1749 days ago · 19 km deep · 10 km away
13. 2.28km N of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 26 km deep · 1 km away
14. 2.729km W of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 21 km deep · 29 km away · felt by 1
15. 1.920km SSE of Rio Dell, CAMon, Dec 20, 3:17 PM PST · 1749 days ago · 31 km deep · 22 km away
16. 2.621km W of Petrolia, CAMon, Dec 20, 3:12 PM PST · 1749 days ago · 21 km deep · 23 km away
17. 2.47km NNW of Petrolia, CAMon, Dec 20, 3:11 PM PST · 1749 days ago · 26 km deep · 2 km away
18. 2.512km SW of Rio Dell, CAMon, Dec 20, 3:02 PM PST · 1749 days ago · 28 km deep · 7 km away
19. 2.011km NNE of Petrolia, CAMon, Dec 20, 2:59 PM PST · 1749 days ago · 28 km deep · 5 km away
20. 2.622km SW of Ferndale, CAMon, Dec 20, 2:57 PM PST · 1749 days ago · 27 km deep · 18 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73666716. Read Sun, Oct 4, 2026, 11:33 PM UTC.