M1.6 earthquake 19 km NW of Mad River, California

Magnitude

1.6 (md), micro

Local time

Thu, May 25, 1978, 2:53 PM PDT

UTC

1978-05-25 21:53:16 UTC

Depth

28.1 km (17.5 mi), shallow

Epicenter

40.566° N, 123.686° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.2 km horizontally, 1.2 km in depth

Magnitude uncertainty

±0.05

Depth from

From location

Station coverage gap

206°, poorly surrounded by stations

Stations used

7

• Hydesville, CaliforniaPopulation 1,237. Forecast35 kmE
• Fortuna, CaliforniaPopulation 12,000. Forecast40 kmE
• Chico, CaliforniaPopulation 121,345. Forecast183 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast869 kmNNW

After

1. 1.735 km SW of Ferndale, CaliforniaMon, May 29, 10:20 PM PDT · 17654 days ago · 17 km deep · 80 km away
2. 1.838 km SW of Ferndale, CaliforniaTue, May 30, 5:38 AM PDT · 17654 days ago · 23 km deep · 80 km away
3. 1.726 km SW of Scotia, CaliforniaTue, May 30, 12:48 PM PDT · 17654 days ago · 11 km deep · 60 km away
4. 1.834 km SW of Ferndale, CaliforniaTue, May 30, 11:51 PM PDT · 17653 days ago · 19 km deep · 77 km away
5. 1.645 km W of Ferndale, CaliforniaFri, Jun 2, 5:07 AM PDT · 17651 days ago · 15 km deep · 95 km away
6. 1.58 km W of Rio Dell, CaliforniaFri, Jun 2, 9:14 AM PDT · 17651 days ago · 19 km deep · 45 km away
7. 1.60 km WSW of Ferndale, CaliforniaSat, Jun 3, 5:08 AM PDT · 17650 days ago · 21 km deep · 49 km away
8. 1.645 km W of Ferndale, CaliforniaSat, Jun 3, 7:35 AM PDT · 17650 days ago · 7 km deep · 94 km away
9. 1.728 km SW of Ferndale, CaliforniaSun, Jun 4, 3:43 AM PDT · 17649 days ago · 21 km deep · 70 km away
10. 1.617 km SW of Scotia, CaliforniaMon, Jun 5, 1:12 AM PDT · 17648 days ago · 22 km deep · 53 km away
11. 1.710 km E of Hayfork, CaliforniaMon, Jun 5, 3:21 AM PDT · 17648 days ago · 25 km deep · 53 km away
12. 1.96 km SW of Scotia, CaliforniaMon, Jun 5, 4:40 AM PDT · 17648 days ago · 27 km deep · 41 km away
13. 1.81 km WSW of Ferndale, CaliforniaMon, Jun 5, 6:52 PM PDT · 17648 days ago · 12 km deep · 50 km away
14. 1.644 km SW of Ferndale, CaliforniaTue, Jun 6, 1:08 AM PDT · 17647 days ago · 20 km deep · 83 km away
15. 1.835 km W of Ferndale, CaliforniaTue, Jun 6, 4:02 AM PDT · 17647 days ago · 20 km deep · 84 km away
16. 1.741 km SW of Ferndale, CaliforniaTue, Jun 6, 6:12 AM PDT · 17647 days ago · 5 km deep · 82 km away
17. 1.86 km W of Scotia, CaliforniaTue, Jun 6, 6:47 AM PDT · 17647 days ago · 22 km deep · 43 km away
18. 1.78 km NE of Hydesville, CaliforniaTue, Jun 6, 7:28 AM PDT · 17647 days ago · 23 km deep · 29 km away
19. 1.59 km SSW of Ferndale, CaliforniaTue, Jun 6, 11:44 PM PDT · 17646 days ago · 20 km deep · 54 km away
20. 1.630 km SW of Ferndale, CaliforniaWed, Jun 7, 1:43 AM PDT · 17646 days ago · 27 km deep · 76 km away
21. 1.631 km SW of Ferndale, CaliforniaWed, Jun 7, 11:00 AM PDT · 17646 days ago · 21 km deep · 71 km away
22. 1.726 km SW of Scotia, CaliforniaWed, Jun 7, 2:50 PM PDT · 17646 days ago · 18 km deep · 62 km away
23. 1.627 km WSW of Ferndale, CaliforniaFri, Jun 9, 2:58 AM PDT · 17644 days ago · 24 km deep · 74 km away
24. 3.016 km SSW of Ferndale, CaliforniaFri, Jun 9, 9:16 PM PDT · 17643 days ago · 21 km deep · 59 km away
25. 2.66 km W of Loleta, CaliforniaFri, Jun 9, 9:58 PM PDT · 17643 days ago · 24 km deep · 53 km away
26. 2.617 km SSW of Ferndale, CaliforniaSat, Jun 10, 12:02 AM PDT · 17643 days ago · 22 km deep · 56 km away
27. 1.715 km NNE of Redcrest, CaliforniaSat, Jun 10, 1:04 AM PDT · 17643 days ago · 21 km deep · 15 km away
28. 1.824 km WNW of Fields Landing, CaliforniaSat, Jun 10, 5:22 AM PDT · 17643 days ago · 23 km deep · 73 km away
29. 1.830 km SW of Ferndale, CaliforniaSat, Jun 10, 2:39 PM PDT · 17643 days ago · 22 km deep · 71 km away
30. 2.629 km SW of Ferndale, CaliforniaSun, Jun 11, 1:11 AM PDT · 17642 days ago · 19 km deep · 70 km away
31. 2.429 km SW of Ferndale, CaliforniaSun, Jun 11, 10:12 AM PDT · 17642 days ago · 22 km deep · 70 km away
32. 1.838 km W of Indianola, CaliforniaMon, Jun 12, 3:51 AM PDT · 17641 days ago · 12 km deep · 86 km away
33. 1.615 km SE of Indianola, CaliforniaMon, Jun 12, 5:04 AM PDT · 17641 days ago · 21 km deep · 28 km away
34. 1.841 km SSW of Ferndale, CaliforniaMon, Jun 12, 6:48 AM PDT · 17641 days ago · 29 km deep · 80 km away
35. 1.611 km WSW of Scotia, CaliforniaMon, Jun 12, 5:33 PM PDT · 17641 days ago · 19 km deep · 48 km away
36. 2.332 km SW of Ferndale, CaliforniaTue, Jun 13, 4:51 AM PDT · 17640 days ago · 23 km deep · 73 km away
37. 2.024 km SW of Ferndale, CaliforniaThu, Jun 15, 12:25 AM PDT · 17638 days ago · 26 km deep · 67 km away
38. 1.63 km W of Miranda, CaliforniaThu, Jun 15, 5:12 PM PDT · 17638 days ago · 16 km deep · 40 km away
39. 1.88 km W of Weott, CaliforniaSat, Jun 17, 1:49 AM PDT · 17636 days ago · 23 km deep · 40 km away
40. 3.38 km W of Rio Dell, CaliforniaSat, Jun 17, 9:48 AM PDT · 17636 days ago · 20 km deep · 45 km away
41. 1.614 km SW of Ferndale, CaliforniaSun, Jun 18, 6:54 AM PDT · 17635 days ago · 25 km deep · 58 km away
42. 1.611 km SSW of Ferndale, CaliforniaSun, Jun 18, 7:37 AM PDT · 17635 days ago · 20 km deep · 53 km away
43. 4.221 km W of Ferndale, CaliforniaSun, Jun 18, 4:05 PM PDT · 17635 days ago · 23 km deep · 70 km away
44. 3.535 km SW of Ferndale, CaliforniaMon, Jun 19, 5:50 AM PDT · 17634 days ago · 26 km deep · 75 km away
45. 1.628 km SW of Ferndale, CaliforniaTue, Jun 20, 12:16 PM PDT · 17633 days ago · 22 km deep · 71 km away
46. 1.523 km SW of Ferndale, CaliforniaTue, Jun 20, 3:37 PM PDT · 17633 days ago · 27 km deep · 67 km away
47. 1.915 km SSW of Ferndale, CaliforniaWed, Jun 21, 2:59 AM PDT · 17632 days ago · 21 km deep · 54 km away
48. 1.920 km SSW of Ferndale, CaliforniaWed, Jun 21, 6:21 AM PDT · 17632 days ago · 24 km deep · 62 km away
49. 1.710 km SSW of Scotia, CaliforniaWed, Jun 21, 2:57 PM PDT · 17632 days ago · 36 km deep · 42 km away
50. 2.217 km SSW of Ferndale, CaliforniaThu, Jun 22, 9:13 PM PDT · 17630 days ago · 18 km deep · 55 km away
51. 1.724 km SSW of Ferndale, CaliforniaThu, Jun 22, 10:10 PM PDT · 17630 days ago · 23 km deep · 62 km away
52. 1.9Northern CaliforniaFri, Jun 23, 3:41 AM PDT · 17630 days ago · 17 km deep · 47 km away
53. 2.428 km SSW of Ferndale, CaliforniaFri, Jun 23, 7:00 AM PDT · 17630 days ago · 23 km deep · 68 km away
54. 3.24 km N of Redway, CaliforniaFri, Jun 23, 10:22 AM PDT · 17630 days ago · 19 km deep · 47 km away
55. 1.614 km ENE of Weott, CaliforniaFri, Jun 23, 8:15 PM PDT · 17630 days ago · 21 km deep · 22 km away
56. 1.5near the coast of Northern CaliforniaSat, Jun 24, 7:15 AM PDT · 17629 days ago · 11 km deep · 95 km away
57. 1.724 km SSW of Ferndale, CaliforniaSat, Jun 24, 7:22 AM PDT · 17629 days ago · 25 km deep · 62 km away
58. 1.96 km WNW of McKinleyville, CaliforniaSun, Jun 25, 9:34 AM PDT · 17628 days ago · 4 km deep · 61 km away
59. 1.67 km WSW of Rio Dell, CaliforniaSun, Jun 25, 8:57 PM PDT · 17627 days ago · 28 km deep · 44 km away
60. 3.132 km SSW of Ferndale, CaliforniaMon, Jun 26, 4:10 AM PDT · 17627 days ago · 26 km deep · 71 km away

The first 60 of 115.

Before

1. 3.013 km WNW of Laytonville, CaliforniaWed, May 24, 8:47 PM PDT · 17659 days ago · 1 km deep · 94 km away
2. 1.617 km WNW of Indianola, CaliforniaWed, May 24, 10:18 AM PDT · 17660 days ago · 22 km deep · 65 km away
3. 2.918 km W of Ferndale, CaliforniaTue, May 23, 4:10 PM PDT · 17661 days ago · 21 km deep · 68 km away
4. 4.632 km SW of Ferndale, CaliforniaTue, May 23, 2:42 PM PDT · 17661 days ago · 29 km deep · 72 km away
5. 1.921 km WSW of Weott, CaliforniaMon, May 22, 8:43 PM PDT · 17661 days ago · 4 km deep · 53 km away
6. 2.341 km SW of Ferndale, CaliforniaMon, May 22, 10:47 AM PDT · 17662 days ago · 19 km deep · 85 km away
7. 2.150 km W of Ferndale, CaliforniaSun, May 21, 7:34 PM PDT · 17663 days ago · 26 km deep · 99 km away
8. 2.5near the coast of Northern CaliforniaSun, May 21, 5:34 PM PDT · 17663 days ago · 20 km deep · 51 km away
9. 1.517 km NW of Shelter Cove, CaliforniaSun, May 21, 3:37 PM PDT · 17663 days ago · 9 km deep · 65 km away
10. 3.743 km SW of Ferndale, CaliforniaSun, May 21, 9:34 AM PDT · 17663 days ago · 22 km deep · 86 km away
11. 2.922 km NNW of Shelter Cove, CaliforniaSun, May 21, 2:43 AM PDT · 17663 days ago · 0 km deep · 56 km away
12. 2.07 km E of Hayfork, CaliforniaSun, May 21, 1:09 AM PDT · 17663 days ago · 21 km deep · 50 km away
13. 1.625 km SSW of Ferndale, CaliforniaSat, May 20, 4:25 AM PDT · 17664 days ago · 24 km deep · 66 km away
14. 1.92 km NNE of Hayfork, CaliforniaSat, May 20, 3:37 AM PDT · 17664 days ago · 14 km deep · 44 km away
15. 3.023 km SSE of Douglas City, CaliforniaFri, May 19, 10:50 PM PDT · 17664 days ago · 4 km deep · 75 km away
16. 1.51 km NNE of Trinidad, CaliforniaFri, May 19, 6:53 AM PDT · 17665 days ago · 17 km deep · 68 km away
17. 2.229 km SW of Ferndale, CaliforniaThu, May 18, 11:47 PM PDT · 17665 days ago · 18 km deep · 71 km away
18. 2.34 km NNW of Redway, CaliforniaThu, May 18, 1:40 AM PDT · 17666 days ago · 21 km deep · 48 km away
19. 2.933 km SSW of Ferndale, CaliforniaThu, May 18, 1:12 AM PDT · 17666 days ago · 24 km deep · 72 km away
20. 2.734 km SW of Ferndale, CaliforniaThu, May 18, 12:57 AM PDT · 17666 days ago · 22 km deep · 74 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1040413. Read Tue, Sep 29, 2026, 2:58 PM UTC.