M1.6 earthquake 24 km WNW of Samoa, California

Magnitude

1.6 (md), micro

Local time

Mon, Apr 20, 1981, 2:59 AM PST

UTC

1981-04-20 10:59:27 UTC

Depth

14.2 km (8.8 mi), shallow

Epicenter

40.935° N, 124.428° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.4 km horizontally, 1.2 km in depth

Depth from

From location

Station coverage gap

274°, poorly surrounded by stations

Stations used

7

• Manila, CaliforniaPopulation 784. Forecast24 kmWNW
• Eureka, CaliforniaPopulation 27,017. Forecast27 kmWNW
• Chico, CaliforniaPopulation 121,345. Forecast257 kmWNW

After

1. 2.437 km SW of Ferndale, CaliforniaMon, Apr 20, 8:52 AM PST · 16598 days ago · 29 km deep · 69 km away
2. 1.921 km WNW of Manila, CaliforniaMon, Apr 20, 1:15 PM PST · 16598 days ago · 17 km deep · 3 km away
3. 2.422 km SE of Indianola, CaliforniaMon, Apr 20, 3:02 PM PST · 16597 days ago · 21 km deep · 54 km away
4. 3.540 km SW of Ferndale, CaliforniaMon, Apr 20, 3:44 PM PST · 16597 days ago · 27 km deep · 68 km away
5. 2.340 km SW of Ferndale, CaliforniaMon, Apr 20, 5:00 PM PST · 16597 days ago · 27 km deep · 69 km away
6. 1.717 km NE of Redcrest, CaliforniaMon, Apr 20, 6:13 PM PST · 16597 days ago · 26 km deep · 68 km away
7. 1.830 km SW of Scotia, CaliforniaMon, Apr 20, 6:26 PM PST · 16597 days ago · 13 km deep · 73 km away
8. 2.220 km SSW of Scotia, CaliforniaTue, Apr 21, 2:54 AM PST · 16597 days ago · 4 km deep · 73 km away
9. 2.24 km SW of Loleta, CaliforniaTue, Apr 21, 10:38 AM PST · 16597 days ago · 19 km deep · 38 km away
10. 1.844 km SW of Ferndale, CaliforniaWed, Apr 22, 1:08 AM PST · 16596 days ago · 28 km deep · 73 km away
11. 2.344 km SW of Ferndale, CaliforniaWed, Apr 22, 1:21 AM PST · 16596 days ago · 18 km deep · 71 km away
12. 3.487 km WSW of Ferndale, CaliforniaWed, Apr 22, 3:43 AM PST · 16596 days ago · 5 km deep · 91 km away
13. 1.69 km WNW of Mad River, CaliforniaWed, Apr 22, 4:31 AM PST · 16596 days ago · 5 km deep · 85 km away
14. 3.138 km SW of Ferndale, CaliforniaWed, Apr 22, 8:37 AM PST · 16596 days ago · 27 km deep · 68 km away
15. 1.642 km SW of Ferndale, CaliforniaWed, Apr 22, 11:40 AM PST · 16596 days ago · 27 km deep · 70 km away
16. 2.536 km SSW of Ferndale, CaliforniaWed, Apr 22, 4:47 PM PST · 16595 days ago · 25 km deep · 72 km away
17. 2.794 km W of Ferndale, CaliforniaWed, Apr 22, 11:22 PM PST · 16595 days ago · 4 km deep · 91 km away
18. 2.144 km SW of Ferndale, CaliforniaThu, Apr 23, 12:50 AM PST · 16595 days ago · 18 km deep · 71 km away
19. 2.038 km SW of Ferndale, CaliforniaThu, Apr 23, 5:40 AM PST · 16595 days ago · 21 km deep · 68 km away
20. 2.428 km SW of Ferndale, CaliforniaThu, Apr 23, 8:22 AM PST · 16595 days ago · 18 km deep · 63 km away
21. 1.938 km SW of Ferndale, CaliforniaFri, Apr 24, 9:59 AM PST · 16594 days ago · 25 km deep · 68 km away
22. 2.022 km WSW of Ferndale, CaliforniaFri, Apr 24, 11:10 AM PST · 16594 days ago · 24 km deep · 53 km away
23. 1.77 km NE of Mad River, CaliforniaFri, Apr 24, 7:36 PM PST · 16593 days ago · 30 km deep · 95 km away
24. 1.885 km W of Big Lagoon, CaliforniaSat, Apr 25, 12:53 PM PST · 16593 days ago · 5 km deep · 66 km away
25. 2.220 km WSW of Weott, CaliforniaSat, Apr 25, 1:04 PM PST · 16593 days ago · 11 km deep · 82 km away
26. 1.939 km WSW of Ferndale, CaliforniaSat, Apr 25, 4:57 PM PST · 16592 days ago · 15 km deep · 55 km away
27. 1.610 km S of Scotia, CaliforniaSun, Apr 26, 1:39 AM PST · 16592 days ago · 36 km deep · 66 km away
28. 2.226 km WSW of Ferndale, CaliforniaSun, Apr 26, 7:52 PM PDT · 16591 days ago · 26 km deep · 54 km away
29. 1.8near the coast of Northern CaliforniaSun, Apr 26, 7:55 PM PDT · 16591 days ago · 8 km deep · 77 km away
30. 1.67 km S of Ferndale, CaliforniaMon, Apr 27, 12:18 AM PDT · 16591 days ago · 17 km deep · 49 km away
31. 1.745 km WNW of Shelter Cove, CaliforniaMon, Apr 27, 2:44 AM PDT · 16591 days ago · 5 km deep · 81 km away
32. 2.56 km NW of Redcrest, CaliforniaTue, Apr 28, 11:33 AM PDT · 16590 days ago · -1 km deep · 65 km away
33. 1.737 km SW of Ferndale, CaliforniaTue, Apr 28, 11:20 PM PDT · 16589 days ago · 31 km deep · 70 km away
34. 1.642 km SW of Ferndale, CaliforniaWed, Apr 29, 11:16 PM PDT · 16588 days ago · 25 km deep · 71 km away
35. 1.811 km SW of Ferndale, CaliforniaFri, May 1, 11:07 AM PDT · 16587 days ago · 25 km deep · 47 km away
36. 2.226 km WNW of Manila, CaliforniaSat, May 2, 5:04 AM PDT · 16586 days ago · 2 km deep · 3 km away
37. 1.914 km WSW of Ferndale, CaliforniaSat, May 2, 10:50 AM PDT · 16586 days ago · 19 km deep · 47 km away
38. 2.434 km SW of Ferndale, CaliforniaSun, May 3, 5:30 AM PDT · 16585 days ago · 28 km deep · 67 km away
39. 1.522 km SSW of Ferndale, CaliforniaSun, May 3, 8:27 AM PDT · 16585 days ago · 21 km deep · 61 km away
40. 2.230 km WSW of Ferndale, CaliforniaSun, May 3, 10:59 AM PDT · 16585 days ago · 23 km deep · 54 km away
41. 1.69 km W of Mad River, CaliforniaSun, May 3, 1:30 PM PDT · 16585 days ago · 4 km deep · 87 km away
42. 2.20 km SE of Trinity Village, CaliforniaSun, May 3, 8:27 PM PDT · 16584 days ago · 5 km deep · 76 km away
43. 1.816 km E of Hydesville, CaliforniaSun, May 3, 8:30 PM PDT · 16584 days ago · 92 km deep · 62 km away
44. 3.295 km W of Ferndale, CaliforniaMon, May 4, 6:06 PM PDT · 16583 days ago · 8 km deep · 98 km away
45. 3.437 km SW of Ferndale, CaliforniaMon, May 4, 11:03 PM PDT · 16583 days ago · 26 km deep · 69 km away
46. 2.29 km ESE of Hyampom, CaliforniaThu, May 7, 11:27 AM PDT · 16581 days ago · 21 km deep · 99 km away
47. 2.122 km W of Ferndale, CaliforniaThu, May 7, 12:05 PM PDT · 16581 days ago · 21 km deep · 44 km away
48. 1.737 km WSW of Ferndale, CaliforniaSat, May 9, 11:22 AM PDT · 16579 days ago · 29 km deep · 62 km away
49. 2.230 km SW of Scotia, CaliforniaSat, May 9, 5:23 PM PDT · 16578 days ago · 18 km deep · 72 km away
50. 3.028 km N of Willow Creek, CaliforniaSun, May 10, 7:52 PM PDT · 16577 days ago · 39 km deep · 77 km away
51. 1.928 km SW of Ferndale, CaliforniaMon, May 11, 4:20 AM PDT · 16577 days ago · 26 km deep · 60 km away
52. 2.236 km SW of Ferndale, CaliforniaMon, May 11, 5:14 PM PDT · 16576 days ago · 27 km deep · 68 km away
53. 1.816 km ENE of Redcrest, CaliforniaTue, May 12, 1:51 AM PDT · 16576 days ago · 0 km deep · 78 km away
54. 1.629 km SW of Scotia, CaliforniaWed, May 13, 2:16 AM PDT · 16575 days ago · 27 km deep · 71 km away
55. 2.773 km WSW of Ferndale, CaliforniaWed, May 13, 2:35 AM PDT · 16575 days ago · 64 km deep · 83 km away
56. 2.122 km W of Indianola, CaliforniaWed, May 13, 3:15 AM PDT · 16575 days ago · 20 km deep · 26 km away
57. 2.35 km SW of Phillipsville, CaliforniaWed, May 13, 5:25 PM PDT · 16574 days ago · 19 km deep · 99 km away
58. 1.736 km SW of Ferndale, CaliforniaWed, May 13, 9:53 PM PDT · 16574 days ago · 35 km deep · 69 km away
59. 2.23 km W of Blue Lake, CaliforniaThu, May 14, 12:21 AM PDT · 16574 days ago · 0 km deep · 35 km away
60. 1.729 km SSW of Ferndale, CaliforniaThu, May 14, 10:50 AM PDT · 16574 days ago · 35 km deep · 66 km away

The first 60 of 171.

Before

1. 1.622 km SE of Indianola, CaliforniaMon, Apr 20, 12:53 AM PST · 16598 days ago · 22 km deep · 55 km away
2. 3.2near the coast of Northern CaliforniaSun, Apr 19, 11:23 PM PST · 16598 days ago · 25 km deep · 69 km away
3. 2.99 km WNW of McKinleyville, CaliforniaSun, Apr 19, 10:22 PM PST · 16598 days ago · 46 km deep · 19 km away
4. 1.634 km SW of Ferndale, CaliforniaSun, Apr 19, 8:53 PM PST · 16598 days ago · 21 km deep · 68 km away
5. 2.0near the coast of Northern CaliforniaSun, Apr 19, 8:42 PM PST · 16598 days ago · 4 km deep · 83 km away
6. 2.1near the coast of Northern CaliforniaSun, Apr 19, 5:16 PM PST · 16598 days ago · 21 km deep · 48 km away
7. 1.811 km WSW of Mad River, CaliforniaSun, Apr 19, 4:04 PM PST · 16598 days ago · -1 km deep · 90 km away
8. 1.540 km SW of Ferndale, CaliforniaSun, Apr 19, 8:50 AM PST · 16599 days ago · 23 km deep · 71 km away
9. 2.13 km SW of Loleta, CaliforniaSun, Apr 19, 3:56 AM PST · 16599 days ago · 21 km deep · 38 km away
10. 1.725 km W of Big Lagoon, CaliforniaSat, Apr 18, 9:16 PM PST · 16599 days ago · 3 km deep · 23 km away
11. 2.020 km W of Big Lagoon, CaliforniaSat, Apr 18, 7:43 PM PST · 16599 days ago · 8 km deep · 22 km away
12. 2.24 km SSW of Westhaven-Moonstone, CaliforniaSat, Apr 18, 12:18 PM PST · 16600 days ago · 15 km deep · 26 km away
13. 1.939 km SW of Ferndale, CaliforniaSat, Apr 18, 10:37 AM PST · 16600 days ago · 20 km deep · 70 km away
14. 1.647 km SW of Ferndale, CaliforniaSat, Apr 18, 7:52 AM PST · 16600 days ago · 13 km deep · 74 km away
15. 3.849 km WSW of Ferndale, CaliforniaSat, Apr 18, 5:17 AM PST · 16600 days ago · 18 km deep · 70 km away
16. 2.639 km SW of Ferndale, CaliforniaFri, Apr 17, 8:24 PM PST · 16600 days ago · 23 km deep · 70 km away
17. 2.938 km SW of Ferndale, CaliforniaFri, Apr 17, 5:26 PM PST · 16600 days ago · 20 km deep · 68 km away
18. 1.534 km SW of Scotia, CaliforniaFri, Apr 17, 1:32 PM PST · 16601 days ago · 12 km deep · 75 km away
19. 2.836 km SW of Ferndale, CaliforniaThu, Apr 16, 5:40 PM PST · 16601 days ago · 26 km deep · 69 km away
20. 2.942 km W of Trinidad, CaliforniaThu, Apr 16, 11:04 AM PST · 16602 days ago · 16 km deep · 20 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1062781. Read Tue, Sep 29, 2026, 9:23 AM UTC.