M1.7 earthquake 6 km NW of Alderpoint, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Oct 25, 1975, 5:29 PM PDT

UTC

1975-10-26 00:29:54 UTC

Depth

29.5 km (18.3 mi), shallow

Epicenter

40.219° N, 123.656° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 2.1 km horizontally, 1.4 km in depth

Magnitude uncertainty

±0.01

Depth from

From location

Station coverage gap

295°, poorly surrounded by stations

Stations used

7

• Miranda, CaliforniaPopulation 520. Forecast14 kmE
• Fortuna, CaliforniaPopulation 12,000. Forecast60 kmSE
• Chico, CaliforniaPopulation 121,345. Forecast164 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast837 kmNNW

After

1. 1.631 km WSW of Ferndale, CaliforniaSun, Oct 26, 1:50 PM PST · 18604 days ago · 22 km deep · 89 km away
2. 1.81 km NW of Ferndale, CaliforniaSun, Oct 26, 11:47 PM PST · 18604 days ago · 20 km deep · 67 km away
3. 1.523 km WNW of Indianola, CaliforniaMon, Oct 27, 1:14 AM PST · 18604 days ago · 28 km deep · 92 km away
4. 1.613 km WSW of Redcrest, CaliforniaTue, Oct 28, 1:46 PM PST · 18602 days ago · -1 km deep · 39 km away
5. 2.328 km SW of Ferndale, CaliforniaTue, Oct 28, 3:45 PM PST · 18602 days ago · 28 km deep · 72 km away
6. 2.927 km NNE of Covelo, CaliforniaWed, Oct 29, 9:33 PM PST · 18601 days ago · 17 km deep · 45 km away
7. 1.98 km SW of Trinidad, CaliforniaWed, Oct 29, 10:40 PM PST · 18601 days ago · 19 km deep · 98 km away
8. 1.927 km SW of Ferndale, CaliforniaThu, Oct 30, 1:55 PM PST · 18600 days ago · 19 km deep · 70 km away
9. 2.6near the coast of Northern CaliforniaThu, Oct 30, 2:21 PM PST · 18600 days ago · 19 km deep · 69 km away
10. 2.228 km SW of Ferndale, CaliforniaFri, Oct 31, 11:17 AM PST · 18599 days ago · 19 km deep · 71 km away
11. 3.332 km SW of Scotia, CaliforniaSat, Nov 1, 2:35 PM PST · 18598 days ago · 48 km deep · 63 km away
12. 1.932 km W of Ferndale, CaliforniaSun, Nov 2, 6:06 PM PST · 18597 days ago · 20 km deep · 95 km away
13. 1.98 km W of Rio Dell, CaliforniaMon, Nov 3, 2:48 AM PST · 18597 days ago · 20 km deep · 55 km away
14. 1.913 km NE of Redcrest, CaliforniaMon, Nov 3, 3:26 PM PST · 18596 days ago · 23 km deep · 34 km away
15. 1.78 km W of Rio Dell, CaliforniaTue, Nov 4, 10:10 AM PST · 18595 days ago · 19 km deep · 56 km away
16. 1.636 km SW of Ferndale, CaliforniaWed, Nov 5, 6:28 PM PST · 18594 days ago · 35 km deep · 79 km away
17. 2.827 km SW of Ferndale, CaliforniaThu, Nov 6, 5:01 AM PST · 18593 days ago · 19 km deep · 69 km away
18. 1.828 km SW of Ferndale, CaliforniaThu, Nov 6, 5:06 AM PST · 18593 days ago · 19 km deep · 72 km away
19. 1.923 km SW of Ferndale, CaliforniaSun, Nov 9, 6:28 AM PST · 18590 days ago · 20 km deep · 68 km away
20. 2.14 km NW of Alderpoint, CaliforniaMon, Nov 10, 10:38 PM PST · 18589 days ago · 33 km deep · 2 km away
21. 4.813 km W of Ferndale, CaliforniaFri, Nov 14, 1:29 AM PST · 18586 days ago · 22 km deep · 77 km away
22. 1.710 km W of Ferndale, CaliforniaFri, Nov 14, 1:37 AM PST · 18586 days ago · 21 km deep · 75 km away
23. 2.125 km WSW of Ferndale, CaliforniaFri, Nov 14, 1:37 AM PST · 18586 days ago · 27 km deep · 82 km away
24. 2.022 km WSW of Ferndale, CaliforniaFri, Nov 14, 1:42 AM PST · 18586 days ago · 26 km deep · 77 km away
25. 1.621 km WSW of Ferndale, CaliforniaFri, Nov 14, 1:51 AM PST · 18586 days ago · 25 km deep · 75 km away
26. 1.58 km W of Ferndale, CaliforniaFri, Nov 14, 2:25 AM PST · 18586 days ago · 24 km deep · 73 km away
27. 1.822 km W of Ferndale, CaliforniaFri, Nov 14, 3:15 AM PST · 18586 days ago · 24 km deep · 83 km away
28. 1.714 km W of Ferndale, CaliforniaFri, Nov 14, 6:21 AM PST · 18585 days ago · 22 km deep · 77 km away
29. 1.622 km WSW of Ferndale, CaliforniaFri, Nov 14, 10:55 AM PST · 18585 days ago · 23 km deep · 77 km away
30. 2.328 km SW of Scotia, CaliforniaFri, Nov 14, 3:11 PM PST · 18585 days ago · 8 km deep · 58 km away
31. 1.825 km SW of Scotia, CaliforniaSat, Nov 15, 1:22 AM PST · 18585 days ago · 22 km deep · 57 km away
32. 1.723 km SW of Scotia, CaliforniaSat, Nov 15, 3:55 AM PST · 18584 days ago · 7 km deep · 54 km away
33. 1.617 km W of Ferndale, CaliforniaSat, Nov 15, 11:58 PM PST · 18584 days ago · 22 km deep · 80 km away
34. 2.540 km SSW of Ferndale, CaliforniaSun, Nov 16, 12:35 AM PST · 18584 days ago · 11 km deep · 74 km away
35. 1.841 km SW of Ferndale, CaliforniaSun, Nov 16, 3:08 AM PST · 18584 days ago · 13 km deep · 76 km away
36. 1.835 km SSW of Ferndale, CaliforniaSun, Nov 16, 12:28 PM PST · 18583 days ago · 14 km deep · 70 km away
37. 1.822 km WSW of Scotia, CaliforniaMon, Nov 17, 12:24 PM PST · 18582 days ago · 12 km deep · 59 km away
38. 2.8near the coast of Northern CaliforniaMon, Nov 17, 12:49 PM PST · 18582 days ago · 10 km deep · 84 km away
39. 3.338 km SW of Ferndale, CaliforniaMon, Nov 17, 1:58 PM PST · 18582 days ago · 12 km deep · 74 km away
40. 2.3near the coast of Northern CaliforniaMon, Nov 17, 2:20 PM PST · 18582 days ago · 14 km deep · 63 km away
41. 2.130 km SSW of Ferndale, CaliforniaMon, Nov 17, 2:34 PM PST · 18582 days ago · 16 km deep · 68 km away
42. 3.244 km SW of Ferndale, CaliforniaMon, Nov 17, 4:11 PM PST · 18582 days ago · 10 km deep · 78 km away
43. 1.928 km WSW of Ferndale, CaliforniaMon, Nov 17, 4:16 PM PST · 18582 days ago · 18 km deep · 84 km away
44. 2.128 km SSW of Ferndale, CaliforniaMon, Nov 17, 4:43 PM PST · 18582 days ago · 15 km deep · 64 km away
45. 1.740 km WNW of Shelter Cove, CaliforniaMon, Nov 17, 6:38 PM PST · 18582 days ago · 16 km deep · 70 km away
46. 2.656 km WNW of Shelter Cove, CaliforniaMon, Nov 17, 10:55 PM PST · 18582 days ago · 1 km deep · 89 km away
47. 2.548 km SW of Ferndale, CaliforniaTue, Nov 18, 5:12 AM PST · 18581 days ago · 7 km deep · 79 km away
48. 1.642 km SSW of Ferndale, CaliforniaTue, Nov 18, 3:04 PM PST · 18581 days ago · 8 km deep · 73 km away
49. 2.67 km W of Rio Dell, CaliforniaTue, Nov 18, 8:47 PM PST · 18581 days ago · 20 km deep · 55 km away
50. 2.214 km W of Ferndale, CaliforniaWed, Nov 19, 12:29 AM PST · 18581 days ago · 23 km deep · 77 km away
51. 3.048 km SW of Ferndale, CaliforniaWed, Nov 19, 2:17 AM PST · 18581 days ago · 8 km deep · 79 km away
52. 2.640 km SW of Ferndale, CaliforniaWed, Nov 19, 2:54 AM PST · 18581 days ago · 9 km deep · 76 km away
53. 2.539 km SSW of Ferndale, CaliforniaWed, Nov 19, 2:59 AM PST · 18581 days ago · 10 km deep · 73 km away
54. 2.841 km SSW of Ferndale, CaliforniaWed, Nov 19, 11:00 PM PST · 18580 days ago · 9 km deep · 73 km away
55. 2.937 km SW of Ferndale, CaliforniaThu, Nov 20, 2:15 PM PST · 18579 days ago · 28 km deep · 74 km away
56. 2.430 km SSW of Ferndale, CaliforniaThu, Nov 20, 3:13 PM PST · 18579 days ago · 24 km deep · 69 km away
57. 2.30 km S of Redway, CaliforniaThu, Nov 20, 6:18 PM PST · 18579 days ago · 19 km deep · 18 km away
58. 3.14 km ENE of Willits, CaliforniaSat, Nov 22, 12:33 AM PST · 18578 days ago · 10 km deep · 93 km away
59. 2.58 km ENE of Willits, CaliforniaSat, Nov 22, 12:54 AM PST · 18578 days ago · -1 km deep · 92 km away
60. 3.229 km W of Ferndale, CaliforniaSat, Nov 22, 4:20 AM PST · 18577 days ago · 33 km deep · 91 km away

The first 60 of 79.

Before

1. 1.928 km WSW of Ferndale, CaliforniaSat, Oct 25, 7:52 AM PDT · 18605 days ago · 26 km deep · 84 km away
2. 1.827 km WSW of Ferndale, CaliforniaMon, Oct 20, 8:30 PM PDT · 18610 days ago · 18 km deep · 85 km away
3. 1.8near the coast of Northern CaliforniaMon, Oct 20, 1:13 PM PDT · 18610 days ago · 20 km deep · 67 km away
4. 1.827 km SW of Ferndale, CaliforniaMon, Oct 20, 8:14 AM PDT · 18610 days ago · 19 km deep · 69 km away
5. 1.76 km SW of Ferndale, CaliforniaSun, Oct 19, 10:00 AM PDT · 18611 days ago · 25 km deep · 65 km away
6. 1.58 km W of Rio Dell, CaliforniaSat, Oct 18, 2:15 PM PDT · 18612 days ago · 21 km deep · 55 km away
7. 2.544 km SW of Ferndale, CaliforniaWed, Oct 15, 10:23 AM PDT · 18615 days ago · 10 km deep · 82 km away
8. 1.66 km W of Rio Dell, CaliforniaTue, Oct 14, 10:22 PM PDT · 18616 days ago · 20 km deep · 54 km away
9. 1.710 km NW of Willow Creek, CaliforniaTue, Oct 14, 2:38 PM PDT · 18616 days ago · 22 km deep · 88 km away
10. 1.68 km W of Rio Dell, CaliforniaTue, Oct 14, 1:05 PM PDT · 18616 days ago · 20 km deep · 55 km away
11. 2.03 km SW of Willow Creek, CaliforniaTue, Oct 14, 12:52 AM PDT · 18617 days ago · 26 km deep · 77 km away
12. 2.03 km N of Ferndale, CaliforniaMon, Oct 13, 5:19 PM PDT · 18617 days ago · 20 km deep · 68 km away
13. 3.232 km NNE of Potter Valley, CaliforniaSun, Oct 12, 8:25 AM PDT · 18618 days ago · 2 km deep · 97 km away
14. 1.923 km SW of Ferndale, CaliforniaSun, Oct 12, 3:05 AM PDT · 18619 days ago · 21 km deep · 69 km away
15. 1.76 km ENE of Phillipsville, CaliforniaSat, Oct 11, 6:34 PM PDT · 18619 days ago · 28 km deep · 5 km away
16. 1.93 km E of Loleta, CaliforniaThu, Oct 9, 12:51 PM PDT · 18621 days ago · 24 km deep · 64 km away
17. 2.312 km ESE of Blue Lake, CaliforniaWed, Oct 8, 11:13 AM PDT · 18622 days ago · 27 km deep · 72 km away
18. 2.27 km E of Phillipsville, CaliforniaTue, Oct 7, 9:57 PM PDT · 18623 days ago · 34 km deep · 4 km away
19. 1.5near the coast of Northern CaliforniaTue, Oct 7, 12:41 AM PDT · 18624 days ago · 25 km deep · 91 km away
20. 2.333 km SW of Ferndale, CaliforniaMon, Oct 6, 8:52 PM PDT · 18624 days ago · 17 km deep · 75 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1027166. Read Fri, Oct 2, 2026, 11:00 PM UTC.