M1.8 earthquake 12 km W of Mad River, California

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Aug 21, 1981, 12:51 AM PDT

UTC

1981-08-21 07:51:33 UTC

Depth

0.3 km (0.2 mi), shallow

Epicenter

40.430° N, 123.659° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.6 km horizontally, 1.6 km in depth

Depth from

From location

Station coverage gap

228°, poorly surrounded by stations

Stations used

3

• Miranda, CaliforniaPopulation 520. Forecast26 kmNNE
• Fortuna, CaliforniaPopulation 12,000. Forecast46 kmESE
• Chico, CaliforniaPopulation 121,345. Forecast173 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast856 kmNNW

After

1. 2.65 km ESE of Trinity Village, CaliforniaSat, Aug 22, 9:14 AM PDT · 16475 days ago · 33 km deep · 51 km away
2. 1.816 km NW of Manila, CASat, Aug 22, 11:12 AM PDT · 16475 days ago · 12 km deep · 79 km away
3. 2.318 km WNW of Manila, CaliforniaSat, Aug 22, 11:13 AM PDT · 16475 days ago · 12 km deep · 81 km away
4. 3.233 km SW of Scotia, CaliforniaSat, Aug 22, 12:31 PM PDT · 16475 days ago · 27 km deep · 64 km away
5. 2.425 km SW of Ferndale, CaliforniaSun, Aug 23, 2:58 AM PDT · 16475 days ago · 28 km deep · 69 km away
6. 2.139 km SW of Ferndale, CASun, Aug 23, 10:50 PM PDT · 16474 days ago · 30 km deep · 78 km away
7. 1.633 km SSW of Ferndale, CaliforniaMon, Aug 24, 12:01 PM PDT · 16473 days ago · 34 km deep · 70 km away
8. 1.811 km SSW of Ferndale, CaliforniaMon, Aug 24, 10:52 PM PDT · 16473 days ago · 20 km deep · 54 km away
9. 1.630 km WSW of Ferndale, CaliforniaTue, Aug 25, 3:04 AM PDT · 16473 days ago · 27 km deep · 77 km away
10. 2.035 km SW of Ferndale, CaliforniaTue, Aug 25, 5:18 PM PDT · 16472 days ago · 17 km deep · 80 km away
11. 2.044 km SW of Ferndale, CaliforniaTue, Aug 25, 5:43 PM PDT · 16472 days ago · 17 km deep · 87 km away
12. 1.811 km S of Ferndale, CaliforniaTue, Aug 25, 8:44 PM PDT · 16472 days ago · 20 km deep · 53 km away
13. 1.87 km S of Laytonville, CaliforniaThu, Aug 27, 1:11 AM PDT · 16471 days ago · 4 km deep · 91 km away
14. 1.86 km W of Laytonville, CaliforniaThu, Aug 27, 3:59 AM PDT · 16471 days ago · 2 km deep · 82 km away
15. 2.013 km SSW of Ferndale, CaliforniaThu, Aug 27, 9:54 AM PDT · 16470 days ago · 19 km deep · 56 km away
16. 1.811 km WSW of Hyampom, CaliforniaThu, Aug 27, 8:21 PM PDT · 16470 days ago · 30 km deep · 19 km away
17. 2.56 km SE of Ferndale, CaliforniaThu, Aug 27, 9:17 PM PDT · 16470 days ago · 12 km deep · 48 km away
18. 2.130 km SW of Ferndale, CaliforniaFri, Aug 28, 9:32 PM PDT · 16469 days ago · 29 km deep · 76 km away
19. 1.843 km SW of Ferndale, CaliforniaSat, Aug 29, 12:37 AM PDT · 16469 days ago · 23 km deep · 85 km away
20. 1.738 km SW of Ferndale, CaliforniaSat, Aug 29, 7:18 PM PDT · 16468 days ago · 35 km deep · 81 km away
21. 3.211 km WSW of Hayfork, CaliforniaSat, Aug 29, 8:31 PM PDT · 16468 days ago · 30 km deep · 32 km away
22. 2.234 km SW of Ferndale, CaliforniaWed, Sep 2, 6:56 AM PDT · 16465 days ago · 33 km deep · 74 km away
23. 2.743 km SW of Ferndale, CaliforniaThu, Sep 3, 5:15 AM PDT · 16464 days ago · 30 km deep · 85 km away
24. 1.626 km WSW of Burnt Ranch, CaliforniaFri, Sep 4, 12:22 AM PDT · 16463 days ago · 27 km deep · 31 km away
25. 1.836 km SW of Ferndale, CaliforniaFri, Sep 4, 1:54 AM PDT · 16463 days ago · 21 km deep · 77 km away
26. 2.637 km SSW of Ferndale, CaliforniaFri, Sep 4, 6:54 PM PDT · 16462 days ago · 28 km deep · 70 km away
27. 1.637 km SW of Ferndale, CaliforniaSat, Sep 5, 2:08 AM PDT · 16462 days ago · 22 km deep · 76 km away
28. 1.947 km SW of Ferndale, CaliforniaSat, Sep 5, 11:56 AM PDT · 16461 days ago · 19 km deep · 91 km away
29. 2.325 km WSW of Ferndale, CaliforniaSun, Sep 6, 1:47 AM PDT · 16461 days ago · 27 km deep · 73 km away
30. 1.98 km N of Covelo, CaliforniaSun, Sep 6, 8:23 AM PDT · 16461 days ago · 9 km deep · 72 km away
31. 2.96 km S of Laytonville, CaliforniaTue, Sep 8, 11:03 AM PDT · 16458 days ago · 5 km deep · 91 km away
32. 2.614 km ESE of Pine Hills, CaliforniaTue, Sep 8, 4:06 PM PDT · 16458 days ago · 22 km deep · 39 km away
33. 1.928 km SSW of Ferndale, CaliforniaSat, Sep 12, 2:40 AM PDT · 16455 days ago · 18 km deep · 67 km away
34. 1.828 km WSW of Ferndale, CaliforniaSat, Sep 12, 5:07 PM PDT · 16454 days ago · 24 km deep · 79 km away
35. 1.631 km SW of Ferndale, CaliforniaSat, Sep 12, 11:12 PM PDT · 16454 days ago · 32 km deep · 70 km away
36. 1.66 km SSE of Ferndale, CaliforniaSun, Sep 13, 7:55 AM PDT · 16454 days ago · 23 km deep · 50 km away
37. 2.921 km NW of Mad River, CaliforniaSun, Sep 13, 10:30 AM PDT · 16453 days ago · 23 km deep · 15 km away
38. 1.638 km SW of Ferndale, CaliforniaMon, Sep 14, 1:54 AM PDT · 16453 days ago · 23 km deep · 76 km away
39. 1.839 km WSW of Ferndale, CaliforniaMon, Sep 14, 9:24 AM PDT · 16452 days ago · 48 km deep · 87 km away
40. 1.628 km SW of Ferndale, CaliforniaMon, Sep 14, 4:07 PM PDT · 16452 days ago · 18 km deep · 70 km away
41. 1.627 km SW of Ferndale, CaliforniaMon, Sep 14, 4:53 PM PDT · 16452 days ago · 17 km deep · 69 km away
42. 3.29 km SSE of Blue Lake, CaliforniaTue, Sep 15, 3:07 PM PDT · 16451 days ago · 26 km deep · 47 km away
43. 1.921 km SSW of Ferndale, CaliforniaTue, Sep 15, 10:24 PM PDT · 16451 days ago · 21 km deep · 62 km away
44. 4.736 km SW of Ferndale, CaliforniaWed, Sep 16, 5:41 AM PDT · 16451 days ago · 28 km deep · 77 km away
45. 3.234 km SW of Ferndale, CaliforniaWed, Sep 16, 5:45 AM PDT · 16451 days ago · 30 km deep · 72 km away
46. 3.636 km SW of Ferndale, CaliforniaWed, Sep 16, 5:45 AM PDT · 16451 days ago · 29 km deep · 76 km away
47. 3.035 km SW of Ferndale, CaliforniaWed, Sep 16, 5:59 AM PDT · 16451 days ago · 28 km deep · 74 km away
48. 1.837 km SW of Ferndale, CaliforniaWed, Sep 16, 6:18 AM PDT · 16451 days ago · 26 km deep · 75 km away
49. 1.837 km SW of Ferndale, CaliforniaWed, Sep 16, 7:16 AM PDT · 16451 days ago · 26 km deep · 77 km away
50. 2.140 km SW of Ferndale, CaliforniaWed, Sep 16, 7:29 AM PDT · 16451 days ago · 27 km deep · 81 km away
51. 1.915 km ESE of Pine Hills, CaliforniaWed, Sep 16, 7:58 AM PDT · 16451 days ago · 22 km deep · 39 km away
52. 3.031 km SW of Ferndale, CaliforniaWed, Sep 16, 8:15 AM PDT · 16451 days ago · 25 km deep · 70 km away
53. 1.943 km SW of Ferndale, CaliforniaWed, Sep 16, 8:25 AM PDT · 16451 days ago · 31 km deep · 83 km away
54. 1.620 km W of Trinidad, CaliforniaWed, Sep 16, 8:25 AM PDT · 16451 days ago · 9 km deep · 94 km away
55. 1.838 km SW of Ferndale, CaliforniaWed, Sep 16, 11:46 AM PDT · 16450 days ago · 29 km deep · 80 km away
56. 2.837 km SW of Ferndale, CaliforniaWed, Sep 16, 11:49 AM PDT · 16450 days ago · 27 km deep · 77 km away
57. 2.433 km SW of Ferndale, CaliforniaWed, Sep 16, 7:39 PM PDT · 16450 days ago · 26 km deep · 72 km away
58. 1.935 km SSW of Ferndale, CaliforniaWed, Sep 16, 8:05 PM PDT · 16450 days ago · 25 km deep · 68 km away
59. 2.111 km WSW of Scotia, CaliforniaWed, Sep 16, 8:28 PM PDT · 16450 days ago · 30 km deep · 47 km away
60. 1.69 km SSE of Blue Lake, CaliforniaThu, Sep 17, 6:55 AM PDT · 16450 days ago · 26 km deep · 48 km away

The first 60 of 153.

Before

1. 2.238 km SW of Ferndale, CaliforniaThu, Aug 20, 9:28 PM PDT · 16477 days ago · 25 km deep · 80 km away
2. 2.112 km SSE of Mad River, CaliforniaThu, Aug 20, 9:50 AM PDT · 16477 days ago · 27 km deep · 19 km away
3. 2.12 km SSW of Loleta, CaliforniaThu, Aug 20, 6:46 AM PDT · 16478 days ago · 19 km deep · 53 km away
4. 2.86 km WSW of Rio Dell, CaliforniaThu, Aug 20, 4:43 AM PDT · 16478 days ago · 22 km deep · 45 km away
5. 1.7near the coast of Northern CaliforniaThu, Aug 20, 3:33 AM PDT · 16478 days ago · 21 km deep · 45 km away
6. 2.124 km SW of Scotia, CaliforniaWed, Aug 19, 4:13 PM PDT · 16478 days ago · 11 km deep · 55 km away
7. 1.7near the coast of Northern CaliforniaWed, Aug 19, 4:12 PM PDT · 16478 days ago · 10 km deep · 58 km away
8. 2.837 km SW of Ferndale, CaliforniaWed, Aug 19, 6:12 AM PDT · 16479 days ago · 17 km deep · 77 km away
9. 2.037 km SW of Ferndale, CaliforniaTue, Aug 18, 11:49 PM PDT · 16479 days ago · 20 km deep · 75 km away
10. 3.037 km SW of Ferndale, CaliforniaTue, Aug 18, 6:27 PM PDT · 16479 days ago · 28 km deep · 77 km away
11. 2.639 km SW of Ferndale, CaliforniaMon, Aug 17, 7:57 AM PDT · 16481 days ago · 21 km deep · 80 km away
12. 1.65 km SE of Ferndale, CaliforniaSun, Aug 16, 3:15 AM PDT · 16482 days ago · 12 km deep · 48 km away
13. 2.017 km SSW of Ferndale, CaliforniaSat, Aug 15, 9:39 PM PDT · 16482 days ago · 23 km deep · 58 km away
14. 1.52 km SE of Indianola, CaliforniaSat, Aug 15, 8:00 PM PDT · 16482 days ago · 14 km deep · 54 km away
15. 2.02 km SE of Indianola, CaliforniaSat, Aug 15, 7:53 PM PDT · 16482 days ago · 14 km deep · 54 km away
16. 1.96 km SSW of Fortuna, CaliforniaSat, Aug 15, 12:07 AM PDT · 16483 days ago · 11 km deep · 47 km away
17. 1.616 km WNW of Fields Landing, CaliforniaFri, Aug 14, 3:41 PM PDT · 16483 days ago · 22 km deep · 72 km away
18. 2.615 km WSW of Scotia, CaliforniaFri, Aug 14, 9:35 AM PDT · 16483 days ago · 30 km deep · 51 km away
19. 1.842 km SW of Ferndale, CaliforniaFri, Aug 14, 5:39 AM PDT · 16484 days ago · 20 km deep · 83 km away
20. 1.534 km SSW of Ferndale, CaliforniaFri, Aug 14, 2:50 AM PDT · 16484 days ago · 20 km deep · 69 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1066992. Read Thu, Oct 1, 2026, 3:31 AM UTC.