M1.6 earthquake 9km NNE of Petrolia, CA

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Dec 20, 2021, 6:25 PM PST

UTC

2021-12-21 02:25:21 UTC

Depth

23.3 km (14.5 mi), shallow

Epicenter

40.401° N, 124.242° 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

±0.13

Depth from

From location

Station coverage gap

101°

Stations used

15

• Scotia, CaliforniaPopulation 850. Forecast15 kmSW
• Fortuna, CaliforniaPopulation 12,000. Forecast23 kmSSW
• Chico, CaliforniaPopulation 121,345. Forecast218 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast883 kmNW

After

1. 2.89km NNE of Petrolia, CAMon, Dec 20, 6:31 PM PST · 1749 days ago · 23 km deep · 0 km away
2. 2.57km N of Petrolia, CAMon, Dec 20, 6:34 PM PST · 1749 days ago · 25 km deep · 4 km away
3. 2.69km N of Petrolia, CAMon, Dec 20, 6:46 PM PST · 1749 days ago · 27 km deep · 2 km away
4. 2.744km WNW of Petrolia, CAMon, Dec 20, 6:48 PM PST · 1749 days ago · 17 km deep · 46 km away
5. 2.713km WSW of Rio Dell, CAMon, Dec 20, 7:18 PM PST · 1749 days ago · 27 km deep · 5 km away
6. 3.810km NNE of Petrolia, CAMon, Dec 20, 7:26 PM PST · 1749 days ago · 27 km deep · 1 km away · felt by 4
7. 2.817km NNW of Petrolia, CAMon, Dec 20, 7:44 PM PST · 1749 days ago · 23 km deep · 14 km away · felt by 2
8. 2.818km NW of Petrolia, CAMon, Dec 20, 8:13 PM PST · 1748 days ago · 24 km deep · 15 km away
9. 3.814km N of Petrolia, CAMon, Dec 20, 8:34 PM PST · 1748 days ago · 28 km deep · 6 km away · felt by 4
10. 2.225km W of Petrolia, CAMon, Dec 20, 9:15 PM PST · 1748 days ago · 19 km deep · 31 km away · felt by 1
11. 2.313km N of Petrolia, CAMon, Dec 20, 9:41 PM PST · 1748 days ago · 25 km deep · 7 km away
12. 2.730km W of Petrolia, CAMon, Dec 20, 9:53 PM PST · 1748 days ago · 21 km deep · 35 km away
13. 2.07km N of Petrolia, CATue, Dec 21, 1:17 AM PST · 1748 days ago · 25 km deep · 3 km away
14. 1.65km E of Petrolia, CATue, Dec 21, 1:27 AM PST · 1748 days ago · 22 km deep · 9 km away
15. 2.27km WSW of Petrolia, CATue, Dec 21, 1:39 AM PST · 1748 days ago · 20 km deep · 15 km away
16. 2.774 km WSW of Ferndale, CaliforniaTue, Dec 21, 2:57 AM PST · 1748 days ago · 10 km deep · 71 km away
17. 2.828km W of Petrolia, CATue, Dec 21, 3:42 AM PST · 1748 days ago · 17 km deep · 34 km away
18. 1.67km S of Ferndale, CATue, Dec 21, 4:13 AM PST · 1748 days ago · 23 km deep · 13 km away
19. 1.812km SSW of Ferndale, CATue, Dec 21, 4:37 AM PST · 1748 days ago · 19 km deep · 10 km away
20. 1.610km SSW of Ferndale, CATue, Dec 21, 4:37 AM PST · 1748 days ago · 23 km deep · 10 km away
21. 1.68km N of Petrolia, CATue, Dec 21, 5:01 AM PST · 1748 days ago · 25 km deep · 4 km away
22. 2.656km WNW of Ferndale, CATue, Dec 21, 5:27 AM PST · 1748 days ago · 18 km deep · 66 km away
23. 2.732km W of Petrolia, CATue, Dec 21, 5:50 AM PST · 1748 days ago · 20 km deep · 37 km away
24. 2.97km N of Petrolia, CATue, Dec 21, 6:09 AM PST · 1748 days ago · 25 km deep · 3 km away
25. 2.317km WSW of Petrolia, CATue, Dec 21, 6:13 AM PST · 1748 days ago · 20 km deep · 24 km away
26. 3.212km SSW of Ferndale, CATue, Dec 21, 6:16 AM PST · 1748 days ago · 28 km deep · 9 km away · felt by 11
27. 2.414km S of Ferndale, CATue, Dec 21, 6:54 AM PST · 1748 days ago · 26 km deep · 8 km away
28. 1.84km ENE of Petrolia, CATue, Dec 21, 7:49 AM PST · 1748 days ago · 23 km deep · 7 km away
29. 2.811km N of Petrolia, CATue, Dec 21, 8:50 AM PST · 1748 days ago · 24 km deep · 6 km away · felt by 5
30. 3.230km W of Petrolia, CATue, Dec 21, 9:24 AM PST · 1748 days ago · 21 km deep · 35 km away · felt by 2
31. 2.838km WNW of Petrolia, CATue, Dec 21, 1:35 PM PST · 1748 days ago · 22 km deep · 41 km away
32. 2.825km W of Petrolia, CATue, Dec 21, 3:08 PM PST · 1748 days ago · 20 km deep · 31 km away · felt by 2
33. 1.85km NNE of Petrolia, CATue, Dec 21, 10:31 PM PST · 1747 days ago · 24 km deep · 4 km away
34. 1.810km N of Petrolia, CATue, Dec 21, 10:51 PM PST · 1747 days ago · 27 km deep · 5 km away
35. 1.611km SW of Rio Dell, CAWed, Dec 22, 12:41 AM PST · 1747 days ago · 25 km deep · 5 km away
36. 1.713km NNE of Petrolia, CAWed, Dec 22, 3:37 AM PST · 1747 days ago · 26 km deep · 4 km away
37. 2.57km NNE of Petrolia, CAWed, Dec 22, 10:39 AM PST · 1747 days ago · 25 km deep · 2 km away
38. 2.611km WSW of Petrolia, CAWed, Dec 22, 1:36 PM PST · 1747 days ago · 28 km deep · 19 km away
39. 2.714km S of Ferndale, CAWed, Dec 22, 5:13 PM PST · 1747 days ago · 26 km deep · 6 km away · felt by 1
40. 2.910km WSW of Petrolia, CAWed, Dec 22, 5:47 PM PST · 1747 days ago · 31 km deep · 18 km away · felt by 1
41. 3.96km N of Petrolia, CAWed, Dec 22, 7:28 PM PST · 1747 days ago · 21 km deep · 5 km away · felt by 77
42. 2.213km WSW of Petrolia, CAThu, Dec 23, 12:27 AM PST · 1746 days ago · 35 km deep · 21 km away
43. 3.26km W of Petrolia, CAThu, Dec 23, 3:24 AM PST · 1746 days ago · 31 km deep · 14 km away · felt by 3
44. 2.540km W of Petrolia, CAThu, Dec 23, 8:25 AM PST · 1746 days ago · 11 km deep · 45 km away
45. 2.915km NW of Petrolia, CAThu, Dec 23, 10:32 AM PST · 1746 days ago · 27 km deep · 12 km away
46. 2.97km WSW of Petrolia, CAThu, Dec 23, 10:55 AM PST · 1746 days ago · 30 km deep · 15 km away · felt by 2
47. 2.411km WSW of Petrolia, CAThu, Dec 23, 10:57 AM PST · 1746 days ago · 29 km deep · 19 km away
48. 2.19km NNE of Petrolia, CAThu, Dec 23, 11:29 AM PST · 1746 days ago · 25 km deep · 1 km away
49. 2.66km NNW of Petrolia, CAThu, Dec 23, 4:14 PM PST · 1746 days ago · 29 km deep · 7 km away
50. 2.55km N of Petrolia, CAThu, Dec 23, 4:20 PM PST · 1746 days ago · 26 km deep · 4 km away
51. 2.649km W of Petrolia, CAThu, Dec 23, 5:34 PM PST · 1746 days ago · 2 km deep · 54 km away
52. 2.411km SW of Petrolia, CAThu, Dec 23, 6:53 PM PST · 1746 days ago · 20 km deep · 19 km away
53. 2.734km W of Petrolia, CAThu, Dec 23, 8:29 PM PST · 1745 days ago · 23 km deep · 39 km away · felt by 1
54. 2.736km W of Petrolia, CAThu, Dec 23, 8:39 PM PST · 1745 days ago · 22 km deep · 41 km away
55. 3.19km WSW of Petrolia, CAFri, Dec 24, 4:58 AM PST · 1745 days ago · 31 km deep · 17 km away · felt by 1
56. 3.635km W of Petrolia, CAFri, Dec 24, 6:24 AM PST · 1745 days ago · 23 km deep · 40 km away · felt by 1
57. 3.344km W of Petrolia, CAFri, Dec 24, 7:51 AM PST · 1745 days ago · 10 km deep · 49 km away · felt by 1
58. 2.912km N of Petrolia, CAFri, Dec 24, 10:30 AM PST · 1745 days ago · 26 km deep · 4 km away
59. 1.74km ENE of Petrolia, CAFri, Dec 24, 3:37 PM PST · 1745 days ago · 26 km deep · 7 km away
60. 2.940km W of Petrolia, CAFri, Dec 24, 6:49 PM PST · 1745 days ago · 20 km deep · 45 km away · felt by 1

The first 60 of 171.

Before

1. 2.815km WSW of Petrolia, CAMon, Dec 20, 5:44 PM PST · 1749 days ago · 20 km deep · 22 km away
2. 2.46km N of Petrolia, CAMon, Dec 20, 5:20 PM PST · 1749 days ago · 25 km deep · 4 km away
3. 1.820km SSE of Rio Dell, CAMon, Dec 20, 5:16 PM PST · 1749 days ago · 29 km deep · 18 km away
4. 2.38km NNE of Petrolia, CAMon, Dec 20, 5:16 PM PST · 1749 days ago · 24 km deep · 2 km away
5. 1.98km N of Petrolia, CAMon, Dec 20, 4:57 PM PST · 1749 days ago · 24 km deep · 4 km away
6. 2.28km NNE of Petrolia, CAMon, Dec 20, 4:51 PM PST · 1749 days ago · 25 km deep · 2 km away
7. 2.557km WNW of Petrolia, CAMon, Dec 20, 4:51 PM PST · 1749 days ago · 8 km deep · 59 km away
8. 2.66km SE of Ferndale, CAMon, Dec 20, 4:26 PM PST · 1749 days ago · 26 km deep · 16 km away
9. 2.627km W of Petrolia, CAMon, Dec 20, 4:12 PM PST · 1749 days ago · 19 km deep · 33 km away
10. 2.88km NNE of Petrolia, CAMon, Dec 20, 4:10 PM PST · 1749 days ago · 23 km deep · 2 km away
11. 2.311km SSW of Ferndale, CAMon, Dec 20, 4:05 PM PST · 1749 days ago · 19 km deep · 11 km away
12. 3.08km SSW of Ferndale, CAMon, Dec 20, 3:40 PM PST · 1749 days ago · 18 km deep · 12 km away · felt by 1
13. 1.79km SSW of Ferndale, CAMon, Dec 20, 3:40 PM PST · 1749 days ago · 18 km deep · 12 km away
14. 1.814km N of Petrolia, CAMon, Dec 20, 3:27 PM PST · 1749 days ago · 23 km deep · 8 km away
15. 1.97km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 26 km deep · 3 km away
16. 2.814km N of Petrolia, CAMon, Dec 20, 3:25 PM PST · 1749 days ago · 23 km deep · 8 km away
17. 2.311km SSW of Ferndale, CAMon, Dec 20, 3:21 PM PST · 1749 days ago · 19 km deep · 11 km away
18. 2.28km N of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 26 km deep · 3 km away
19. 2.729km W of Petrolia, CAMon, Dec 20, 3:18 PM PST · 1749 days ago · 21 km deep · 33 km away · felt by 1
20. 1.920km SSE of Rio Dell, CAMon, Dec 20, 3:17 PM PST · 1749 days ago · 31 km deep · 19 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73666836. Read Sun, Oct 4, 2026, 3:14 PM UTC.