M1.8 earthquake 16km W of Petrolia, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Tue, May 18, 2021, 11:56 AM PDT

UTC

2021-05-18 18:56:56 UTC

Depth

10.1 km (6.3 mi), shallow

Epicenter

40.301° N, 124.471° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.6 km horizontally, 0.3 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

248°, poorly surrounded by stations

Stations used

10

• Ferndale, CaliforniaPopulation 1,369. Forecast35 kmSSW
• Fortuna, CaliforniaPopulation 12,000. Forecast42 kmSW
• Chico, CaliforniaPopulation 121,345. Forecast233 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast887 kmNW

After

1. 2.420km NW of Bayview, CAThu, May 20, 5:19 PM PDT · 1962 days ago · 22 km deep · 66 km away
2. 2.931km WNW of Petrolia, CASat, May 22, 4:14 PM PDT · 1960 days ago · 22 km deep · 18 km away
3. 2.544km W of Ferndale, CAMon, May 24, 12:15 AM PDT · 1959 days ago · 18 km deep · 44 km away
4. 1.635km E of Hydesville, CAWed, May 26, 11:18 PM PDT · 1956 days ago · 24 km deep · 71 km away
5. 1.717km E of Petrolia, CAThu, May 27, 2:53 AM PDT · 1956 days ago · 27 km deep · 33 km away
6. 2.522km W of Petrolia, CASat, May 29, 9:34 AM PDT · 1954 days ago · 21 km deep · 6 km away · felt by 1
7. 2.836km WNW of Petrolia, CATue, Jun 1, 8:27 AM PDT · 1951 days ago · 20 km deep · 22 km away
8. 2.130km NE of Redway, CAWed, Jun 2, 4:00 AM PDT · 1950 days ago · 23 km deep · 76 km away
9. 2.815km WNW of Willow Creek, CAThu, Jun 3, 12:34 PM PDT · 1948 days ago · 23 km deep · 94 km away
10. 2.216km W of Petrolia, CAFri, Jun 4, 3:57 PM PDT · 1947 days ago · 15 km deep · 0 km away
11. 2.121km W of Petrolia, CASat, Jun 5, 4:47 PM PDT · 1946 days ago · 18 km deep · 5 km away
12. 2.112km WNW of Petrolia, CASun, Jun 6, 3:33 AM PDT · 1946 days ago · 17 km deep · 9 km away
13. 2.132km W of Hayfork, CAMon, Jun 7, 6:49 AM PDT · 1945 days ago · 6 km deep · 82 km away
14. 1.822km NW of Petrolia, CAMon, Jun 7, 5:28 PM PDT · 1944 days ago · 20 km deep · 17 km away
15. 2.513km N of Petrolia, CAWed, Jun 9, 6:49 AM PDT · 1943 days ago · 28 km deep · 23 km away
16. 1.623km W of Petrolia, CAThu, Jun 10, 10:37 PM PDT · 1941 days ago · 15 km deep · 7 km away
17. 1.84km NW of Petrolia, CASat, Jun 12, 6:17 PM PDT · 1939 days ago · 29 km deep · 14 km away
18. 2.445km W of Ferndale, CASun, Jun 13, 2:06 PM PDT · 1938 days ago · 24 km deep · 37 km away
19. 1.714km E of Rio Dell, CAMon, Jun 14, 1:49 PM PDT · 1937 days ago · 20 km deep · 49 km away
20. 1.614km E of Rio Dell, CAMon, Jun 14, 11:49 PM PDT · 1937 days ago · 21 km deep · 49 km away
21. 1.516km WNW of Petrolia, CATue, Jun 15, 4:27 AM PDT · 1937 days ago · 16 km deep · 9 km away
22. 2.417km NW of Petrolia, CAWed, Jun 16, 11:18 PM PDT · 1935 days ago · 23 km deep · 13 km away
23. 2.110km WSW of Petrolia, CASat, Jun 19, 2:07 AM PDT · 1933 days ago · 17 km deep · 7 km away
24. 2.842km W of Petrolia, CASun, Jun 20, 3:16 AM PDT · 1932 days ago · 19 km deep · 27 km away
25. 1.59km WSW of Petrolia, CAMon, Jun 21, 3:57 PM PDT · 1930 days ago · 9 km deep · 8 km away
26. 2.27km NE of Shelter Cove, CAThu, Jun 24, 5:03 AM PDT · 1928 days ago · 21 km deep · 47 km away
27. 2.966km W of Petrolia, CAFri, Jun 25, 11:34 PM PDT · 1926 days ago · 8 km deep · 50 km away · felt by 3
28. 1.88km ESE of Redway, CASat, Jun 26, 11:13 PM PDT · 1925 days ago · 22 km deep · 67 km away
29. 2.436km NNE of Redway, CASun, Jun 27, 1:34 AM PDT · 1925 days ago · 29 km deep · 73 km away
30. 3.1100km W of Petrolia, CASun, Jun 27, 11:57 AM PDT · 1925 days ago · 6 km deep · 85 km away
31. 1.89km W of Willow Creek, CAMon, Jun 28, 7:30 PM PDT · 1923 days ago · 12 km deep · 93 km away
32. 2.311km SSW of Ferndale, CAWed, Jun 30, 12:26 PM PDT · 1921 days ago · 19 km deep · 24 km away
33. 2.015km SW of Petrolia, CAFri, Jul 2, 3:51 PM PDT · 1919 days ago · 7 km deep · 12 km away
34. 1.722km W of Petrolia, CASun, Jul 4, 1:35 PM PDT · 1917 days ago · 26 km deep · 8 km away
35. 2.011km SSW of Ferndale, CATue, Jul 6, 5:19 PM PDT · 1915 days ago · 19 km deep · 25 km away
36. 2.821km W of Petrolia, CASat, Jul 10, 3:32 AM PDT · 1912 days ago · 20 km deep · 6 km away
37. 2.022km W of Petrolia, CASat, Jul 10, 3:35 AM PDT · 1912 days ago · 19 km deep · 6 km away
38. 3.9104km W of Petrolia, CASun, Jul 11, 5:59 AM PDT · 1911 days ago · 5 km deep · 88 km away · felt by 4
39. 3.457km W of Petrolia, CASun, Jul 11, 8:43 PM PDT · 1910 days ago · 6 km deep · 42 km away · felt by 7
40. 1.79km SSW of Ferndale, CASun, Jul 11, 11:51 PM PDT · 1910 days ago · 18 km deep · 27 km away
41. 1.69km SSW of Ferndale, CASun, Jul 11, 11:58 PM PDT · 1910 days ago · 19 km deep · 27 km away
42. 1.89km SSW of Ferndale, CAMon, Jul 12, 12:38 AM PDT · 1910 days ago · 18 km deep · 27 km away
43. 2.48km WSW of Petrolia, CATue, Jul 13, 5:55 AM PDT · 1909 days ago · 20 km deep · 8 km away
44. 2.421km W of Petrolia, CAThu, Jul 15, 5:21 AM PDT · 1907 days ago · 8 km deep · 6 km away

Before

1. 1.614km WSW of Petrolia, CATue, May 18, 5:05 AM PDT · 1965 days ago · 12 km deep · 3 km away
2. 2.223km W of Petrolia, CATue, May 18, 12:09 AM PDT · 1965 days ago · 19 km deep · 7 km away
3. 2.412km W of Petrolia, CAMon, May 17, 8:58 AM PDT · 1966 days ago · 15 km deep · 4 km away
4. 2.515km WSW of Petrolia, CAMon, May 17, 2:39 AM PDT · 1966 days ago · 20 km deep · 2 km away
5. 2.813km W of Petrolia, CAMon, May 17, 12:09 AM PDT · 1966 days ago · 16 km deep · 3 km away · felt by 1
6. 2.88km W of Redway, CASun, May 16, 11:36 PM PDT · 1966 days ago · 18 km deep · 51 km away · felt by 5
7. 1.88km W of Redway, CASun, May 16, 8:07 AM PDT · 1967 days ago · 18 km deep · 51 km away
8. 2.98km W of Redway, CASun, May 16, 6:26 AM PDT · 1967 days ago · 19 km deep · 51 km away · felt by 4
9. 2.71km NNE of Humboldt Hill, CAFri, May 14, 8:02 PM PDT · 1968 days ago · 5 km deep · 54 km away · felt by 199
10. 2.849km W of Ferndale, CAThu, May 13, 6:53 PM PDT · 1969 days ago · 24 km deep · 49 km away · felt by 3
11. 2.110km SSW of Ferndale, CAWed, May 12, 11:32 AM PDT · 1971 days ago · 18 km deep · 26 km away
12. 1.812km SE of Petrolia, CAWed, May 12, 2:55 AM PDT · 1971 days ago · 11 km deep · 25 km away
13. 1.926km N of Laytonville, CAWed, May 12, 1:04 AM PDT · 1971 days ago · 9 km deep · 93 km away
14. 2.326km N of Laytonville, CAWed, May 12, 12:53 AM PDT · 1971 days ago · 8 km deep · 92 km away
15. 2.713km NW of Petrolia, CAWed, May 12, 12:11 AM PDT · 1971 days ago · 17 km deep · 11 km away · felt by 1
16. 2.423km W of Petrolia, CASun, May 9, 9:44 AM PDT · 1974 days ago · 21 km deep · 7 km away
17. 2.510km NNW of Petrolia, CASat, May 8, 1:29 AM PDT · 1975 days ago · 29 km deep · 16 km away · felt by 1
18. 2.219km SSE of Rio Dell, CAFri, May 7, 9:31 AM PDT · 1976 days ago · 30 km deep · 37 km away
19. 1.813km W of Petrolia, CAFri, May 7, 2:50 AM PDT · 1976 days ago · 19 km deep · 6 km away
20. 1.714km WSW of Petrolia, CAThu, May 6, 3:51 AM PDT · 1977 days ago · 13 km deep · 3 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73564280. Read Sun, Oct 4, 2026, 6:49 AM UTC.