M2.3 earthquake 34 km SW of Ferndale, California

Magnitude

2.3 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Apr 20, 1978, 12:22 PM PST

UTC

1978-04-20 20:22:12 UTC

Depth

21.1 km (13.1 mi), shallow

Epicenter

40.322° N, 124.499° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 3.9 km horizontally, 0.7 km in depth

Depth from

From location

Station coverage gap

307°, poorly surrounded by stations

Stations used

11

• Ferndale, CaliforniaPopulation 1,369. Forecast35 kmSW
• Fortuna, CaliforniaPopulation 12,000. Forecast42 kmSW
• Chico, CaliforniaPopulation 121,345. Forecast236 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast890 kmNW

After

1. 3.223 km SW of Ferndale, CaliforniaFri, Apr 21, 7:06 PM PST · 17697 days ago · 21 km deep · 15 km away
2. 2.817 km SW of Ferndale, CaliforniaSat, Apr 22, 4:00 AM PST · 17696 days ago · 22 km deep · 18 km away
3. 2.732 km SW of Ferndale, CaliforniaSat, Apr 22, 10:57 PM PST · 17695 days ago · 21 km deep · 9 km away
4. 1.943 km W of Ferndale, CaliforniaSun, Apr 23, 9:43 PM PST · 17694 days ago · 23 km deep · 42 km away
5. 1.713 km ENE of Hydesville, CaliforniaMon, Apr 24, 12:01 AM PST · 17694 days ago · 20 km deep · 55 km away
6. 1.517 km SSW of Ferndale, CaliforniaMon, Apr 24, 8:20 PM PST · 17693 days ago · 26 km deep · 17 km away
7. 1.515 km SSW of Ferndale, CaliforniaWed, Apr 26, 2:22 AM PST · 17692 days ago · 22 km deep · 21 km away
8. 3.110 km SSW of Ferndale, CaliforniaWed, Apr 26, 11:01 AM PST · 17692 days ago · 19 km deep · 25 km away
9. 1.710 km S of Ferndale, CaliforniaWed, Apr 26, 11:08 AM PST · 17692 days ago · 19 km deep · 26 km away
10. 2.065 km W of Ferndale, CaliforniaWed, Apr 26, 7:47 PM PST · 17692 days ago · 6 km deep · 52 km away
11. 1.710 km S of Ferndale, CaliforniaWed, Apr 26, 8:40 PM PST · 17691 days ago · 18 km deep · 26 km away
12. 2.357 km W of Trinidad, CaliforniaWed, Apr 26, 10:36 PM PST · 17691 days ago · 7 km deep · 89 km away
13. 1.531 km WSW of Ferndale, CaliforniaThu, Apr 27, 4:20 AM PST · 17691 days ago · 25 km deep · 19 km away
14. 2.710 km S of Ferndale, CaliforniaThu, Apr 27, 5:27 AM PST · 17691 days ago · 19 km deep · 25 km away
15. 2.574 km W of Ferndale, CaliforniaThu, Apr 27, 2:59 PM PST · 17691 days ago · 1 km deep · 56 km away
16. 2.558 km W of Ferndale, CaliforniaThu, Apr 27, 5:11 PM PST · 17691 days ago · 30 km deep · 49 km away
17. 2.159 km WSW of Ferndale, CaliforniaThu, Apr 27, 9:03 PM PST · 17690 days ago · 11 km deep · 39 km away
18. 1.929 km SW of Ferndale, CaliforniaThu, Apr 27, 10:17 PM PST · 17690 days ago · 27 km deep · 9 km away
19. 2.228 km SW of Ferndale, CaliforniaThu, Apr 27, 10:19 PM PST · 17690 days ago · 27 km deep · 8 km away
20. 2.333 km SW of Ferndale, CaliforniaFri, Apr 28, 12:40 AM PST · 17690 days ago · 23 km deep · 10 km away
21. 2.233 km SSW of Ferndale, CaliforniaFri, Apr 28, 2:32 PM PST · 17690 days ago · 21 km deep · 2 km away
22. 1.827 km WSW of Ferndale, CaliforniaSat, Apr 29, 9:38 AM PST · 17689 days ago · 24 km deep · 15 km away
23. 1.535 km SSW of Ferndale, CaliforniaSat, Apr 29, 11:39 PM PST · 17688 days ago · 25 km deep · 2 km away
24. 1.619 km SSW of Ferndale, CaliforniaTue, May 2, 9:46 PM PDT · 17685 days ago · 23 km deep · 15 km away
25. 4.260 km W of Big Lagoon, CaliforniaFri, May 5, 12:49 AM PDT · 17683 days ago · 0 km deep · 100 km away
26. 1.710 km WSW of Rio Dell, CaliforniaSat, May 6, 7:32 PM PDT · 17682 days ago · 5 km deep · 29 km away
27. 1.611 km S of Ferndale, CaliforniaMon, May 8, 7:17 PM PDT · 17680 days ago · 2 km deep · 28 km away
28. 1.634 km SSW of Ferndale, CaliforniaMon, May 8, 11:26 PM PDT · 17679 days ago · 30 km deep · 3 km away
29. 4.063 km WSW of Ferndale, CaliforniaWed, May 10, 11:30 AM PDT · 17678 days ago · 11 km deep · 40 km away
30. 2.730 km SW of Ferndale, CaliforniaThu, May 11, 10:24 PM PDT · 17676 days ago · 19 km deep · 5 km away
31. 1.726 km WSW of Ferndale, CaliforniaFri, May 12, 10:47 AM PDT · 17676 days ago · 23 km deep · 20 km away
32. 1.527 km SW of Ferndale, CaliforniaSat, May 13, 2:30 PM PDT · 17675 days ago · 24 km deep · 9 km away
33. 1.52 km W of Benbow, CaliforniaSat, May 13, 5:39 PM PDT · 17675 days ago · 16 km deep · 65 km away
34. 1.629 km SW of Ferndale, CaliforniaSun, May 14, 12:19 AM PDT · 17674 days ago · 19 km deep · 6 km away
35. 3.230 km SW of Ferndale, CaliforniaTue, May 16, 7:55 PM PDT · 17672 days ago · 28 km deep · 4 km away
36. 1.613 km WSW of Ferndale, CaliforniaWed, May 17, 2:27 AM PDT · 17671 days ago · 22 km deep · 23 km away
37. 1.92 km SW of Miranda, CaliforniaWed, May 17, 2:38 AM PDT · 17671 days ago · 13 km deep · 56 km away
38. 2.731 km SW of Ferndale, CaliforniaWed, May 17, 3:14 AM PDT · 17671 days ago · 28 km deep · 3 km away
39. 2.422 km SW of Ferndale, CaliforniaWed, May 17, 3:38 AM PDT · 17671 days ago · 22 km deep · 12 km away
40. 2.734 km SW of Ferndale, CaliforniaThu, May 18, 12:57 AM PDT · 17670 days ago · 22 km deep · 1 km away
41. 2.933 km SSW of Ferndale, CaliforniaThu, May 18, 1:12 AM PDT · 17670 days ago · 24 km deep · 2 km away
42. 2.34 km NNW of Redway, CaliforniaThu, May 18, 1:40 AM PDT · 17670 days ago · 21 km deep · 59 km away
43. 2.229 km SW of Ferndale, CaliforniaThu, May 18, 11:47 PM PDT · 17669 days ago · 18 km deep · 6 km away
44. 1.51 km NNE of Trinidad, CaliforniaFri, May 19, 6:53 AM PDT · 17669 days ago · 17 km deep · 89 km away
45. 1.625 km SSW of Ferndale, CaliforniaSat, May 20, 4:25 AM PDT · 17668 days ago · 24 km deep · 9 km away
46. 2.922 km NNW of Shelter Cove, CaliforniaSun, May 21, 2:43 AM PDT · 17667 days ago · 0 km deep · 30 km away
47. 3.743 km SW of Ferndale, CaliforniaSun, May 21, 9:34 AM PDT · 17667 days ago · 22 km deep · 12 km away
48. 1.517 km NW of Shelter Cove, CaliforniaSun, May 21, 3:37 PM PDT · 17667 days ago · 9 km deep · 31 km away
49. 2.5near the coast of Northern CaliforniaSun, May 21, 5:34 PM PDT · 17667 days ago · 20 km deep · 27 km away
50. 2.150 km W of Ferndale, CaliforniaSun, May 21, 7:34 PM PDT · 17667 days ago · 26 km deep · 41 km away
51. 2.341 km SW of Ferndale, CaliforniaMon, May 22, 10:47 AM PDT · 17666 days ago · 19 km deep · 13 km away
52. 1.921 km WSW of Weott, CaliforniaMon, May 22, 8:43 PM PDT · 17666 days ago · 4 km deep · 31 km away
53. 4.632 km SW of Ferndale, CaliforniaTue, May 23, 2:42 PM PDT · 17665 days ago · 29 km deep · 3 km away
54. 2.918 km W of Ferndale, CaliforniaTue, May 23, 4:10 PM PDT · 17665 days ago · 21 km deep · 28 km away
55. 1.617 km WNW of Indianola, CaliforniaWed, May 24, 10:18 AM PDT · 17664 days ago · 22 km deep · 48 km away
56. 3.013 km WNW of Laytonville, CaliforniaWed, May 24, 8:47 PM PDT · 17664 days ago · 1 km deep · 100 km away
57. 1.619 km NW of Mad River, CaliforniaThu, May 25, 2:53 PM PDT · 17663 days ago · 28 km deep · 74 km away
58. 2.069 km W of Ferndale, CaliforniaSun, May 28, 2:27 PM PDT · 17660 days ago · 2 km deep · 57 km away
59. 4.8off the coast of Northern CaliforniaSun, May 28, 5:46 PM PDT · 17660 days ago · 8 km deep · 68 km away
60. 1.735 km SW of Ferndale, CaliforniaMon, May 29, 10:20 PM PDT · 17658 days ago · 17 km deep · 12 km away

The first 60 of 114.

Before

1. 2.53 km SSW of Westhaven-Moonstone, CaliforniaWed, Apr 19, 9:13 PM PST · 17698 days ago · 13 km deep · 84 km away
2. 1.544 km WSW of Ferndale, CaliforniaWed, Apr 19, 1:50 AM PST · 17699 days ago · 6 km deep · 18 km away
3. 1.521 km SW of Ferndale, CaliforniaTue, Apr 18, 10:45 AM PST · 17700 days ago · 22 km deep · 14 km away
4. 1.728 km SSW of Ferndale, CaliforniaTue, Apr 18, 4:45 AM PST · 17700 days ago · 17 km deep · 10 km away
5. 1.623 km SW of Scotia, CaliforniaTue, Apr 18, 4:15 AM PST · 17700 days ago · 15 km deep · 15 km away
6. 1.927 km SW of Ferndale, CaliforniaMon, Apr 17, 1:10 PM PST · 17701 days ago · 26 km deep · 12 km away
7. 1.67 km SSE of Ferndale, CaliforniaSun, Apr 16, 7:26 PM PST · 17702 days ago · 24 km deep · 30 km away
8. 1.711 km W of Scotia, CaliforniaSun, Apr 16, 5:56 PM PST · 17702 days ago · 7 km deep · 28 km away
9. 2.929 km WSW of Ferndale, CaliforniaSun, Apr 16, 10:17 AM PST · 17702 days ago · 21 km deep · 24 km away
10. 1.523 km SSW of Ferndale, CaliforniaSun, Apr 16, 1:44 AM PST · 17702 days ago · 20 km deep · 12 km away
11. 1.626 km WNW of Manila, CaliforniaSat, Apr 15, 9:55 PM PST · 17702 days ago · 19 km deep · 72 km away
12. 1.910 km WSW of Rio Dell, CaliforniaSat, Apr 15, 5:45 PM PST · 17703 days ago · 4 km deep · 29 km away
13. 1.710 km WSW of Rio Dell, CaliforniaSat, Apr 15, 5:25 PM PST · 17703 days ago · 5 km deep · 28 km away
14. 1.61 km N of Rio Dell, CaliforniaSat, Apr 15, 2:56 PM PST · 17703 days ago · 3 km deep · 39 km away
15. 1.827 km WSW of Ferndale, CaliforniaSat, Apr 15, 11:29 AM PST · 17703 days ago · 25 km deep · 13 km away
16. 1.929 km SW of Scotia, CaliforniaSat, Apr 15, 5:21 AM PST · 17703 days ago · 21 km deep · 12 km away
17. 2.266 km WNW of Indianola, CaliforniaThu, Apr 13, 12:02 PM PST · 17705 days ago · 8 km deep · 75 km away
18. 2.571 km W of Samoa, CaliforniaWed, Apr 12, 9:07 PM PST · 17705 days ago · 6 km deep · 81 km away
19. 3.418 km SSW of Scotia, CaliforniaWed, Apr 12, 9:22 AM PST · 17706 days ago · 22 km deep · 24 km away
20. 2.168 km W of Ferndale, CaliforniaWed, Apr 12, 12:58 AM PST · 17706 days ago · 7 km deep · 52 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1039929. Read Sat, Oct 3, 2026, 3:22 PM UTC.