M1.8 earthquake 6km NNW of Petrolia, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Dec 20, 2021, 12:27 PM PST

UTC

2021-12-20 20:27:55 UTC

Depth

26.1 km (16.2 mi), shallow

Epicenter

40.379° N, 124.299° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

143°

Stations used

16

• Scotia, CaliforniaPopulation 850. Forecast20 kmSW
• Fortuna, CaliforniaPopulation 12,000. Forecast27 kmSSW
• Chico, CaliforniaPopulation 121,345. Forecast222 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast884 kmNW

After

1. 2.99km N of Petrolia, CAMon, Dec 20, 12:28 PM PST · 1749 days ago · 25 km deep · 3 km away · felt by 5
2. 2.812km NNW of Petrolia, CAMon, Dec 20, 12:29 PM PST · 1749 days ago · 26 km deep · 6 km away · felt by 1
3. 1.915km NNW of Petrolia, CAMon, Dec 20, 12:30 PM PST · 1749 days ago · 26 km deep · 9 km away
4. 2.810km SSE of Ferndale, CAMon, Dec 20, 12:30 PM PST · 1749 days ago · 25 km deep · 14 km away
5. 2.65km NNW of Petrolia, CAMon, Dec 20, 12:34 PM PST · 1749 days ago · 28 km deep · 1 km away
6. 2.611km WSW of Rio Dell, CAMon, Dec 20, 12:36 PM PST · 1749 days ago · 25 km deep · 11 km away
7. 2.518km W of Petrolia, CAMon, Dec 20, 12:37 PM PST · 1749 days ago · 20 km deep · 19 km away
8. 1.86km NE of Petrolia, CAMon, Dec 20, 12:39 PM PST · 1749 days ago · 23 km deep · 6 km away
9. 2.39km NNE of Petrolia, CAMon, Dec 20, 12:40 PM PST · 1749 days ago · 24 km deep · 4 km away
10. 2.19km NNE of Petrolia, CAMon, Dec 20, 12:42 PM PST · 1749 days ago · 25 km deep · 5 km away
11. 2.16km ENE of Petrolia, CAMon, Dec 20, 12:46 PM PST · 1749 days ago · 28 km deep · 7 km away
12. 2.67km N of Petrolia, CAMon, Dec 20, 12:46 PM PST · 1749 days ago · 26 km deep · 2 km away
13. 3.327km W of Petrolia, CAMon, Dec 20, 12:47 PM PST · 1749 days ago · 18 km deep · 26 km away · felt by 13
14. 2.94km NE of Petrolia, CAMon, Dec 20, 12:53 PM PST · 1749 days ago · 22 km deep · 5 km away
15. 3.111km N of Petrolia, CAMon, Dec 20, 12:55 PM PST · 1749 days ago · 25 km deep · 5 km away · felt by 2
16. 3.07km NW of Petrolia, CAMon, Dec 20, 12:56 PM PST · 1749 days ago · 28 km deep · 4 km away
17. 2.59km N of Petrolia, CAMon, Dec 20, 12:57 PM PST · 1749 days ago · 29 km deep · 4 km away
18. 1.88km ENE of Petrolia, CAMon, Dec 20, 12:58 PM PST · 1749 days ago · 30 km deep · 9 km away
19. 3.08km SSW of Rio Dell, CAMon, Dec 20, 1:06 PM PST · 1749 days ago · 27 km deep · 15 km away · felt by 1
20. 2.213km N of Petrolia, CAMon, Dec 20, 1:09 PM PST · 1749 days ago · 23 km deep · 7 km away
21. 3.114km NNE of Petrolia, CAMon, Dec 20, 1:10 PM PST · 1749 days ago · 28 km deep · 8 km away · felt by 3
22. 2.813km WSW of Petrolia, CAMon, Dec 20, 1:12 PM PST · 1749 days ago · 22 km deep · 15 km away
23. 2.914km SSW of Ferndale, CAMon, Dec 20, 1:16 PM PST · 1749 days ago · 26 km deep · 10 km away
24. 2.57km NNE of Petrolia, CAMon, Dec 20, 1:16 PM PST · 1749 days ago · 24 km deep · 3 km away
25. 2.514km N of Petrolia, CAMon, Dec 20, 1:17 PM PST · 1749 days ago · 29 km deep · 8 km away
26. 2.38km SSW of Ferndale, CAMon, Dec 20, 1:17 PM PST · 1749 days ago · 19 km deep · 14 km away
27. 2.412km S of Ferndale, CAMon, Dec 20, 1:19 PM PST · 1749 days ago · 25 km deep · 10 km away
28. 3.313km SSW of Ferndale, CAMon, Dec 20, 1:19 PM PST · 1749 days ago · 24 km deep · 9 km away · felt by 7
29. 2.614km N of Petrolia, CAMon, Dec 20, 1:21 PM PST · 1749 days ago · 27 km deep · 8 km away
30. 2.715km SW of Ferndale, CAMon, Dec 20, 1:24 PM PST · 1749 days ago · 26 km deep · 12 km away
31. 2.612km SSW of Ferndale, CAMon, Dec 20, 1:29 PM PST · 1749 days ago · 25 km deep · 10 km away
32. 2.04km ENE of Petrolia, CAMon, Dec 20, 1:31 PM PST · 1749 days ago · 21 km deep · 6 km away
33. 3.211km NNE of Petrolia, CAMon, Dec 20, 1:31 PM PST · 1749 days ago · 23 km deep · 6 km away · felt by 1
34. 2.414km NNW of Petrolia, CAMon, Dec 20, 1:42 PM PST · 1749 days ago · 22 km deep · 8 km away
35. 2.411km NNE of Petrolia, CAMon, Dec 20, 1:43 PM PST · 1749 days ago · 28 km deep · 7 km away
36. 2.411km SSW of Ferndale, CAMon, Dec 20, 1:50 PM PST · 1749 days ago · 21 km deep · 12 km away
37. 2.312km SW of Rio Dell, CAMon, Dec 20, 1:51 PM PST · 1749 days ago · 29 km deep · 9 km away
38. 2.212km SSW of Ferndale, CAMon, Dec 20, 1:52 PM PST · 1749 days ago · 21 km deep · 12 km away
39. 3.318km SW of Ferndale, CAMon, Dec 20, 1:52 PM PST · 1749 days ago · 25 km deep · 15 km away · felt by 2
40. 3.96km NE of Petrolia, CAMon, Dec 20, 1:53 PM PST · 1749 days ago · 27 km deep · 7 km away · felt by 1
41. 1.94km NNE of Petrolia, CAMon, Dec 20, 2:06 PM PST · 1749 days ago · 28 km deep · 4 km away
42. 2.68km W of Petrolia, CAMon, Dec 20, 2:09 PM PST · 1749 days ago · 31 km deep · 8 km away · felt by 2
43. 2.410km NNE of Petrolia, CAMon, Dec 20, 2:10 PM PST · 1749 days ago · 24 km deep · 6 km away
44. 2.37km NNE of Petrolia, CAMon, Dec 20, 2:19 PM PST · 1749 days ago · 23 km deep · 3 km away · felt by 4
45. 2.012km S of Ferndale, CAMon, Dec 20, 2:27 PM PST · 1749 days ago · 24 km deep · 11 km away
46. 2.320km NNE of Redway, CAMon, Dec 20, 2:33 PM PST · 1749 days ago · 26 km deep · 46 km away · felt by 3
47. 2.610km NNW of Petrolia, CAMon, Dec 20, 2:40 PM PST · 1749 days ago · 26 km deep · 4 km away
48. 2.833km W of Petrolia, CAMon, Dec 20, 2:45 PM PST · 1749 days ago · 19 km deep · 32 km away
49. 2.829km W of Petrolia, CAMon, Dec 20, 2:51 PM PST · 1749 days ago · 19 km deep · 29 km away · felt by 3
50. 2.622km SW of Ferndale, CAMon, Dec 20, 2:57 PM PST · 1749 days ago · 27 km deep · 18 km away
51. 2.011km NNE of Petrolia, CAMon, Dec 20, 2:59 PM PST · 1749 days ago · 28 km deep · 7 km away
52. 2.512km SW of Rio Dell, CAMon, Dec 20, 3:02 PM PST · 1749 days ago · 28 km deep · 9 km away
53. 2.47km NNW of Petrolia, CAMon, Dec 20, 3:11 PM PST · 1749 days ago · 26 km deep · 1 km away
54. 2.621km W of Petrolia, CAMon, Dec 20, 3:12 PM PST · 1749 days ago · 21 km deep · 22 km away
55. 1.920km SSE of Rio Dell, CAMon, Dec 20, 3:17 PM PST · 1749 days ago · 31 km deep · 22 km away
56. 2.729km W of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 21 km deep · 28 km away · felt by 1
57. 2.28km N of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 26 km deep · 3 km away
58. 2.311km SSW of Ferndale, CAMon, Dec 20, 3:21 PM PST · 1749 days ago · 19 km deep · 11 km away
59. 2.814km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 23 km deep · 8 km away
60. 1.97km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 26 km deep · 2 km away

The first 60 of at least 200.

Before

1. 2.312km SW of Rio Dell, CAMon, Dec 20, 12:26 PM PST · 1749 days ago · 27 km deep · 9 km away
2. 2.711km N of Petrolia, CAMon, Dec 20, 12:25 PM PST · 1749 days ago · 25 km deep · 5 km away
3. 2.69km S of Ferndale, CAMon, Dec 20, 12:24 PM PST · 1749 days ago · 26 km deep · 13 km away
4. 2.79km SW of Petrolia, CAMon, Dec 20, 12:23 PM PST · 1749 days ago · 21 km deep · 13 km away
5. 2.68km N of Petrolia, CAMon, Dec 20, 12:23 PM PST · 1749 days ago · 26 km deep · 2 km away · felt by 1
6. 2.510km ESE of Petrolia, CAMon, Dec 20, 12:21 PM PST · 1749 days ago · 28 km deep · 13 km away
7. 1.87km N of Petrolia, CAMon, Dec 20, 12:21 PM PST · 1749 days ago · 23 km deep · 2 km away
8. 2.212km N of Petrolia, CAMon, Dec 20, 12:20 PM PST · 1749 days ago · 25 km deep · 6 km away
9. 2.311km SW of Rio Dell, CAMon, Dec 20, 12:20 PM PST · 1749 days ago · 28 km deep · 10 km away
10. 2.86km N of Petrolia, CAMon, Dec 20, 12:20 PM PST · 1749 days ago · 26 km deep · 1 km away
11. 2.76km NW of Petrolia, CAMon, Dec 20, 12:20 PM PST · 1749 days ago · 28 km deep · 3 km away
12. 2.315km NW of Petrolia, CAMon, Dec 20, 12:19 PM PST · 1749 days ago · 29 km deep · 10 km away
13. 2.27km N of Petrolia, CAMon, Dec 20, 12:19 PM PST · 1749 days ago · 24 km deep · 2 km away
14. 2.18km N of Petrolia, CAMon, Dec 20, 12:18 PM PST · 1749 days ago · 25 km deep · 3 km away
15. 2.811km N of Petrolia, CAMon, Dec 20, 12:18 PM PST · 1749 days ago · 25 km deep · 5 km away
16. 2.19km NNE of Petrolia, CAMon, Dec 20, 12:17 PM PST · 1749 days ago · 24 km deep · 5 km away
17. 2.47km N of Petrolia, CAMon, Dec 20, 12:17 PM PST · 1749 days ago · 28 km deep · 2 km away
18. 4.852km W of Petrolia, CAMon, Dec 20, 12:13 PM PST · 1749 days ago · 20 km deep · 51 km away · felt by 8
19. 6.27km N of Petrolia, CAMon, Dec 20, 12:10 PM PST · 1749 days ago · 27 km deep · 1 km away · felt by 4,378 · PAGER yellow · tsunami flag
20. 5.729km W of Petrolia, CAMon, Dec 20, 12:10 PM PST · 1749 days ago · 17 km deep · 29 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73666286. Read Sun, Oct 4, 2026, 2:42 PM UTC.