M1.6 earthquake 20 km W of Hyampom, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Sep 6, 1985, 12:57 AM PDT

UTC

1985-09-06 07:57:51 UTC

Depth

18.2 km (11.3 mi), shallow

Epicenter

40.619° N, 123.701° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.8 km horizontally, 1.0 km in depth

Magnitude uncertainty

±0.05

Depth from

From location

Station coverage gap

69°

Stations used

7

• Hydesville, CaliforniaPopulation 1,237. Forecast34 kmENE
• Fortuna, CaliforniaPopulation 12,000. Forecast39 kmE
• Chico, CaliforniaPopulation 121,345. Forecast187 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast875 kmNNW

After

1. 2.938 km SW of Ferndale, CaliforniaFri, Sep 6, 6:14 AM PDT · 15003 days ago · 19 km deep · 81 km away
2. 2.837 km SW of Ferndale, CaliforniaSat, Sep 7, 7:55 AM PDT · 15002 days ago · 21 km deep · 78 km away
3. 2.654 km SW of Ferndale, CaliforniaTue, Sep 10, 9:37 PM PDT · 14999 days ago · 7 km deep · 97 km away
4. 2.214 km SW of Trinity Center, CaliforniaWed, Sep 11, 4:52 AM PDT · 14998 days ago · 8 km deep · 80 km away
5. 3.337 km SW of Ferndale, CaliforniaWed, Sep 11, 3:01 PM PDT · 14998 days ago · 2 km deep · 82 km away
6. 2.37 km SSE of Trinity Center, CaliforniaThu, Sep 19, 11:53 AM PDT · 14990 days ago · 4 km deep · 93 km away
7. 1.71 km SW of Redway, CaliforniaFri, Sep 20, 2:50 PM PDT · 14989 days ago · 19 km deep · 58 km away
8. 2.210 km SW of Scotia, CaliforniaTue, Sep 24, 11:20 PM PDT · 14985 days ago · 12 km deep · 46 km away
9. 1.648 km SW of Ferndale, CaliforniaThu, Sep 26, 9:12 AM PDT · 14983 days ago · 3 km deep · 93 km away
10. 2.04 km NE of Hydesville, CaliforniaThu, Sep 26, 4:14 PM PDT · 14983 days ago · 25 km deep · 31 km away
11. 1.831 km SSW of Ferndale, CaliforniaSat, Sep 28, 12:32 PM PDT · 14981 days ago · 4 km deep · 70 km away
12. 2.541 km WSW of Ferndale, CaliforniaSun, Sep 29, 8:57 AM PDT · 14980 days ago · 16 km deep · 89 km away
13. 1.84 km N of Hydesville, CaliforniaSun, Sep 29, 6:12 PM PDT · 14980 days ago · 19 km deep · 34 km away
14. 1.619 km SSW of Ferndale, CaliforniaSun, Sep 29, 7:56 PM PDT · 14980 days ago · 26 km deep · 59 km away
15. 1.818 km SSW of Ferndale, CaliforniaSun, Sep 29, 8:14 PM PDT · 14980 days ago · 26 km deep · 60 km away
16. 1.835 km WSW of Ferndale, CaliforniaSun, Sep 29, 8:49 PM PDT · 14980 days ago · 25 km deep · 82 km away
17. 1.813 km N of French Gulch, CaliforniaMon, Sep 30, 7:19 PM PDT · 14979 days ago · 40 km deep · 94 km away
18. 3.329 km SE of Ruth, CaliforniaTue, Oct 1, 4:59 AM PDT · 14978 days ago · 42 km deep · 79 km away
19. 2.14 km ESE of Fortuna, CaliforniaFri, Oct 4, 12:52 PM PDT · 14975 days ago · 22 km deep · 34 km away
20. 1.722 km WSW of Weott, CaliforniaFri, Oct 4, 3:30 PM PDT · 14975 days ago · 9 km deep · 57 km away
21. 2.221 km WSW of Ferndale, CaliforniaSat, Oct 5, 12:12 AM PDT · 14975 days ago · 22 km deep · 68 km away
22. 2.422 km NW of Mad River, CaliforniaSat, Oct 5, 4:49 AM PDT · 14974 days ago · 23 km deep · 5 km away
23. 1.925 km SW of Ferndale, CaliforniaSat, Oct 5, 8:51 PM PDT · 14974 days ago · 27 km deep · 69 km away
24. 3.528 km SW of Ferndale, CaliforniaSat, Oct 5, 9:34 PM PDT · 14974 days ago · 16 km deep · 70 km away
25. 1.714 km W of Ruth, CaliforniaWed, Oct 9, 3:47 AM PDT · 14970 days ago · -1 km deep · 43 km away
26. 2.720 km SW of Weott, CaliforniaFri, Oct 11, 2:11 AM PDT · 14968 days ago · 4 km deep · 57 km away
27. 2.041 km SW of Ferndale, CaliforniaFri, Oct 11, 4:43 PM PDT · 14968 days ago · 23 km deep · 86 km away
28. 3.337 km SW of Ferndale, CaliforniaSun, Oct 13, 6:14 PM PDT · 14966 days ago · 25 km deep · 80 km away
29. 1.631 km WNW of Paskenta, CaliforniaMon, Oct 14, 1:51 AM PDT · 14965 days ago · 10 km deep · 97 km away
30. 2.625 km SE of Blue Lake, CaliforniaSat, Oct 19, 4:11 PM PDT · 14960 days ago · 53 km deep · 13 km away
31. 2.312 km SW of Scotia, CaliforniaMon, Oct 21, 1:42 AM PDT · 14958 days ago · 6 km deep · 49 km away
32. 3.622 km WNW of Indianola, CaliforniaFri, Oct 25, 6:56 PM PDT · 14954 days ago · 21 km deep · 68 km away
33. 3.122 km WSW of Weott, CaliforniaSat, Oct 26, 4:41 PM PDT · 14953 days ago · 13 km deep · 58 km away
34. 2.127 km E of Ruth, CaliforniaTue, Oct 29, 5:57 AM PST · 14950 days ago · 25 km deep · 72 km away
35. 2.98 km WNW of McKinleyville, CaliforniaTue, Oct 29, 7:48 PM PST · 14950 days ago · 18 km deep · 57 km away
36. 1.917 km NW of Willow Creek, CaliforniaWed, Oct 30, 8:44 PM PST · 14949 days ago · -1 km deep · 50 km away
37. 2.719 km WNW of Indianola, CaliforniaThu, Oct 31, 7:31 PM PST · 14948 days ago · 20 km deep · 65 km away
38. 2.18 km NNE of Trinity Village, CaliforniaSat, Nov 2, 7:58 PM PST · 14946 days ago · 23 km deep · 41 km away
39. 1.521 km W of Trinity Center, CaliforniaSun, Nov 3, 8:07 PM PST · 14945 days ago · 20 km deep · 74 km away

Before

1. 1.622 km W of Hyampom, CaliforniaThu, Sep 5, 8:00 PM PDT · 15004 days ago · 4 km deep · 4 km away
2. 2.121 km W of Hyampom, CaliforniaThu, Sep 5, 7:36 PM PDT · 15004 days ago · 22 km deep · 3 km away
3. 2.529 km SW of Ferndale, CaliforniaThu, Sep 5, 7:14 PM PDT · 15004 days ago · 16 km deep · 75 km away
4. 2.58 km SE of Alderpoint, CaliforniaThu, Sep 5, 12:30 PM PDT · 15004 days ago · 3 km deep · 58 km away
5. 2.59 km SSW of Hyampom, CaliforniaWed, Sep 4, 9:57 PM PDT · 15005 days ago · 5 km deep · 18 km away
6. 1.616 km ENE of Leggett, CaliforniaMon, Sep 2, 11:52 PM PDT · 15007 days ago · 2 km deep · 81 km away
7. 2.024 km WSW of Ferndale, CaliforniaMon, Sep 2, 10:47 AM PDT · 15007 days ago · 26 km deep · 70 km away
8. 3.722 km NW of Mad River, CaliforniaMon, Sep 2, 9:53 AM PDT · 15007 days ago · 23 km deep · 4 km away
9. 2.4near the coast of Northern CaliforniaSun, Sep 1, 1:18 PM PDT · 15008 days ago · 13 km deep · 58 km away
10. 1.922 km ESE of Orick, CaliforniaSat, Aug 31, 11:33 PM PDT · 15009 days ago · 4 km deep · 65 km away
11. 1.925 km SSW of Scotia, CaliforniaSat, Aug 31, 1:38 AM PDT · 15009 days ago · 7 km deep · 58 km away
12. 2.419 km SSE of Blue Lake, CaliforniaFri, Aug 30, 2:21 AM PDT · 15010 days ago · 24 km deep · 19 km away
13. 2.644 km WSW of Ferndale, CaliforniaTue, Aug 27, 8:23 AM PDT · 15013 days ago · 17 km deep · 90 km away
14. 2.028 km SSW of Ferndale, CaliforniaMon, Aug 26, 1:08 PM PDT · 15014 days ago · 13 km deep · 68 km away
15. 2.111 km WNW of Hyampom, CaliforniaSun, Aug 25, 9:59 AM PDT · 15015 days ago · 20 km deep · 11 km away
16. 2.336 km SW of Ferndale, CaliforniaSat, Aug 24, 1:54 AM PDT · 15016 days ago · 20 km deep · 77 km away
17. 1.935 km SW of Ferndale, CaliforniaWed, Aug 21, 6:02 AM PDT · 15019 days ago · 12 km deep · 76 km away
18. 2.146 km W of Ferndale, CaliforniaTue, Aug 20, 10:14 PM PDT · 15020 days ago · 21 km deep · 94 km away
19. 2.126 km SW of Scotia, CaliforniaSat, Aug 17, 5:27 PM PDT · 15023 days ago · 10 km deep · 63 km away
20. 1.923 km SW of Scotia, CaliforniaWed, Aug 14, 4:53 PM PDT · 15026 days ago · 8 km deep · 60 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc55740. Read Sun, Oct 4, 2026, 7:43 PM UTC.