M1.7 earthquake 19km WNW of Petrolia, CA

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Oct 18, 2021, 9:54 PM PDT

UTC

2021-10-19 04:54:00 UTC

Depth

17.8 km (11.1 mi), shallow

Epicenter

40.403° N, 124.482° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.5 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

279°, poorly surrounded by stations

Stations used

13

• Ferndale, CaliforniaPopulation 1,369. Forecast27 kmSW
• Fortuna, CaliforniaPopulation 12,000. Forecast35 kmSW
• Chico, CaliforniaPopulation 121,345. Forecast237 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast896 kmNW

After

1. 2.656km W of Ferndale, CAWed, Oct 20, 12:27 PM PDT · 1810 days ago · 25 km deep · 43 km away
2. 2.212km WSW of Petrolia, CAWed, Oct 20, 7:43 PM PDT · 1809 days ago · 9 km deep · 12 km away
3. 2.923km W of Petrolia, CAThu, Oct 21, 6:10 AM PDT · 1809 days ago · 20 km deep · 14 km away · felt by 1
4. 2.426km WNW of Petrolia, CAFri, Oct 22, 9:40 PM PDT · 1807 days ago · 29 km deep · 8 km away
5. 1.913km ENE of Hydesville, CAWed, Oct 27, 8:17 PM PDT · 1802 days ago · 21 km deep · 49 km away
6. 2.519km W of Petrolia, CASat, Oct 30, 4:24 PM PDT · 1799 days ago · 19 km deep · 6 km away
7. 4.45km NNE of Petrolia, CATue, Nov 2, 5:24 PM PDT · 1796 days ago · 30 km deep · 20 km away · felt by 114 · tsunami flag
8. 2.34km NNE of Petrolia, CATue, Nov 2, 5:27 PM PDT · 1796 days ago · 30 km deep · 19 km away
9. 2.66km NNE of Petrolia, CATue, Nov 2, 5:39 PM PDT · 1796 days ago · 28 km deep · 20 km away · felt by 2
10. 2.56km N of Petrolia, CATue, Nov 2, 5:41 PM PDT · 1796 days ago · 29 km deep · 17 km away
11. 3.06km NNE of Petrolia, CATue, Nov 2, 6:33 PM PDT · 1796 days ago · 30 km deep · 19 km away · felt by 10
12. 2.53km N of Petrolia, CATue, Nov 2, 9:55 PM PDT · 1796 days ago · 28 km deep · 18 km away
13. 2.028km NE of Redway, CATue, Nov 2, 9:59 PM PDT · 1796 days ago · 27 km deep · 76 km away
14. 1.75km NNE of Petrolia, CATue, Nov 2, 10:10 PM PDT · 1796 days ago · 28 km deep · 20 km away
15. 2.45km NNW of Petrolia, CATue, Nov 2, 10:58 PM PDT · 1796 days ago · 29 km deep · 16 km away
16. 2.48km SSE of Petrolia, CAFri, Nov 5, 10:52 AM PDT · 1794 days ago · 21 km deep · 24 km away
17. 1.86km NNE of Petrolia, CASat, Nov 6, 8:33 AM PDT · 1793 days ago · 28 km deep · 20 km away
18. 1.917km WNW of Cape Vizcaino, CASat, Nov 6, 5:47 PM PDT · 1792 days ago · 1 km deep · 79 km away
19. 3.0111km W of Petrolia, CASun, Nov 7, 9:48 PM PST · 1791 days ago · 19 km deep · 95 km away
20. 2.86km NNE of Petrolia, CATue, Nov 9, 11:48 AM PST · 1790 days ago · 27 km deep · 20 km away
21. 2.96km NNE of Petrolia, CAThu, Nov 11, 5:35 AM PST · 1788 days ago · 29 km deep · 20 km away
22. 2.037km W of Petrolia, CAFri, Nov 12, 7:05 AM PST · 1787 days ago · 19 km deep · 23 km away
23. 2.212km WNW of Petrolia, CASat, Nov 13, 1:12 PM PST · 1785 days ago · 17 km deep · 7 km away
24. 1.72km N of Redway, CAFri, Nov 19, 7:08 PM PST · 1779 days ago · 22 km deep · 63 km away
25. 2.8101km W of Petrolia, CASun, Nov 21, 8:42 PM PST · 1777 days ago · 5 km deep · 84 km away
26. 3.020km W of Petrolia, CAMon, Nov 22, 1:22 PM PST · 1776 days ago · 19 km deep · 12 km away · felt by 4
27. 2.415km WSW of Petrolia, CATue, Nov 23, 12:24 AM PST · 1776 days ago · 17 km deep · 12 km away · felt by 1
28. 2.747km W of Petrolia, CATue, Nov 23, 11:11 PM PST · 1775 days ago · 12 km deep · 30 km away
29. 2.421km SSE of Willow Creek, CAWed, Nov 24, 1:26 AM PST · 1775 days ago · 21 km deep · 91 km away
30. 2.647km W of Petrolia, CAWed, Nov 24, 3:14 PM PST · 1774 days ago · 11 km deep · 30 km away
31. 2.29km ESE of Willow Creek, CAWed, Nov 24, 10:18 PM PST · 1774 days ago · 22 km deep · 97 km away
32. 2.313km SE of Petrolia, CAThu, Nov 25, 1:18 AM PST · 1774 days ago · 12 km deep · 32 km away
33. 2.615km SE of Petrolia, CAThu, Nov 25, 2:10 AM PST · 1774 days ago · 11 km deep · 33 km away · felt by 1
34. 2.718km W of Petrolia, CASun, Nov 28, 8:36 PM PST · 1770 days ago · 21 km deep · 6 km away
35. 1.84km N of Hydesville, CAMon, Nov 29, 4:51 PM PST · 1769 days ago · 19 km deep · 39 km away
36. 2.774km W of Petrolia, CAMon, Nov 29, 7:14 PM PST · 1769 days ago · 9 km deep · 59 km away
37. 2.7100km W of Petrolia, CAMon, Dec 6, 11:05 PM PST · 1762 days ago · 10 km deep · 83 km away
38. 2.419km W of Petrolia, CATue, Dec 7, 8:22 AM PST · 1762 days ago · 10 km deep · 11 km away
39. 2.826km W of Petrolia, CATue, Dec 7, 1:06 PM PST · 1761 days ago · 12 km deep · 16 km away
40. 4.0112km W of Petrolia, CATue, Dec 7, 7:04 PM PST · 1761 days ago · 27 km deep · 95 km away · felt by 4
41. 2.713km SE of Petrolia, CAWed, Dec 8, 8:28 PM PST · 1760 days ago · 13 km deep · 32 km away · felt by 1
42. 2.740km W of Petrolia, CAWed, Dec 8, 10:00 PM PST · 1760 days ago · 16 km deep · 23 km away
43. 1.811km SSE of Blue Lake, CAWed, Dec 8, 10:38 PM PST · 1760 days ago · 21 km deep · 65 km away
44. 2.627km WNW of Petrolia, CAFri, Dec 10, 4:25 AM PST · 1759 days ago · 20 km deep · 8 km away
45. 2.010km SSW of Ferndale, CAFri, Dec 10, 11:52 PM PST · 1758 days ago · 18 km deep · 17 km away
46. 2.310km SE of Willow Creek, CASat, Dec 11, 8:56 PM PST · 1757 days ago · 18 km deep · 97 km away
47. 2.419km WSW of Petrolia, CAWed, Dec 15, 6:48 AM PST · 1754 days ago · 21 km deep · 13 km away
48. 1.69km ENE of Petrolia, CAWed, Dec 15, 6:34 PM PST · 1753 days ago · 22 km deep · 26 km away
49. 2.319km NW of Petrolia, CAFri, Dec 17, 10:06 AM PST · 1752 days ago · 18 km deep · 5 km away

Before

1. 1.74km NNW of Ferndale, CASun, Oct 17, 7:20 AM PDT · 1813 days ago · 17 km deep · 29 km away
2. 1.65km NW of Redway, CASun, Oct 17, 4:25 AM PDT · 1813 days ago · 23 km deep · 60 km away
3. 1.98km SSE of Redway, CAFri, Oct 15, 11:19 PM PDT · 1814 days ago · 17 km deep · 71 km away
4. 2.08km SSE of Redway, CAFri, Oct 15, 11:18 PM PDT · 1814 days ago · 17 km deep · 70 km away
5. 1.713km E of Hydesville, CAThu, Oct 14, 5:45 AM PDT · 1816 days ago · 24 km deep · 49 km away
6. 3.818km WSW of Petrolia, CATue, Oct 12, 4:29 AM PDT · 1818 days ago · 21 km deep · 13 km away · felt by 11
7. 2.856km W of Ferndale, CAFri, Oct 8, 8:49 PM PDT · 1821 days ago · 20 km deep · 43 km away
8. 2.17km SSE of Pine Hills, CAFri, Oct 8, 2:39 PM PDT · 1821 days ago · 25 km deep · 43 km away
9. 1.612km SE of Petrolia, CAFri, Oct 8, 1:05 PM PDT · 1822 days ago · 11 km deep · 30 km away
10. 2.757km W of Ferndale, CAFri, Oct 8, 5:06 AM PDT · 1822 days ago · 9 km deep · 43 km away
11. 2.856km W of Ferndale, CAThu, Oct 7, 6:08 PM PDT · 1822 days ago · 24 km deep · 43 km away
12. 1.818km E of Rio Dell, CAThu, Oct 7, 8:37 AM PDT · 1823 days ago · 20 km deep · 50 km away
13. 2.018km E of Rio Dell, CAWed, Oct 6, 7:40 PM PDT · 1823 days ago · 20 km deep · 50 km away
14. 2.414km SW of Ferndale, CATue, Oct 5, 11:21 AM PDT · 1825 days ago · 23 km deep · 13 km away
15. 3.264km WNW of Petrolia, CATue, Oct 5, 8:54 AM PDT · 1825 days ago · 11 km deep · 47 km away · felt by 1
16. 2.59km SW of Petrolia, CASat, Oct 2, 1:10 AM PDT · 1828 days ago · 33 km deep · 17 km away
17. 2.87km WSW of Petrolia, CAWed, Sep 29, 11:37 PM PDT · 1830 days ago · 30 km deep · 15 km away · felt by 1
18. 1.926km ESE of Rio Dell, CAWed, Sep 29, 8:49 AM PDT · 1831 days ago · 20 km deep · 56 km away
19. 2.713km SE of Petrolia, CAMon, Sep 27, 3:27 PM PDT · 1832 days ago · 12 km deep · 31 km away
20. 2.658km W of Petrolia, CASun, Sep 26, 12:54 PM PDT · 1834 days ago · 19 km deep · 42 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73641385. Read Sun, Oct 4, 2026, 7:45 AM UTC.