M2.5 earthquake 20 km SE of Ruth, California

Magnitude

2.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Sep 9, 1976, 5:45 AM PDT

UTC

1976-09-09 12:45:22 UTC

Depth

38.1 km (23.7 mi), shallow

Epicenter

40.139° N, 123.158° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 9.2 km horizontally, 5.5 km in depth

Depth from

From location

Station coverage gap

317°, poorly surrounded by stations

Stations used

6

• Covelo, CaliforniaPopulation 1,255. Forecast39 kmNNE
• Red Bluff, CaliforniaPopulation 14,131. Forecast78 kmW
• Chico, CaliforniaPopulation 121,345. Forecast121 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast805 kmNNW

After

1. 2.116 km SW of Mad River, CaliforniaThu, Sep 9, 8:44 AM PDT · 18287 days ago · 25 km deep · 45 km away
2. 1.613 km WSW of Scotia, CaliforniaThu, Sep 9, 10:21 PM PDT · 18286 days ago · 25 km deep · 99 km away
3. 1.63 km W of Phillipsville, CaliforniaFri, Sep 10, 3:04 AM PDT · 18286 days ago · -1 km deep · 57 km away
4. 1.612 km ENE of Hydesville, CaliforniaSun, Sep 12, 3:09 AM PDT · 18284 days ago · 20 km deep · 85 km away
5. 1.60 km W of Fortuna, CaliforniaSun, Sep 12, 5:07 AM PDT · 18284 days ago · 19 km deep · 99 km away
6. 1.611 km S of Ferndale, CaliforniaMon, Sep 13, 1:37 PM PDT · 18283 days ago · 4 km deep · 100 km away
7. 2.311 km E of Potter Valley, CaliforniaTue, Sep 14, 4:40 AM PDT · 18282 days ago · 3 km deep · 92 km away
8. 3.032 km NNE of Potter Valley, CaliforniaFri, Sep 17, 4:09 AM PDT · 18279 days ago · 15 km deep · 66 km away
9. 2.89 km WSW of Rio Dell, CaliforniaSat, Sep 18, 3:57 PM PDT · 18277 days ago · 24 km deep · 97 km away
10. 1.78 km WSW of Rio Dell, CaliforniaWed, Sep 22, 6:56 PM PDT · 18273 days ago · 21 km deep · 96 km away
11. 2.75 km SSE of Leggett, CaliforniaSat, Sep 25, 11:20 AM PDT · 18271 days ago · 13 km deep · 57 km away
12. 2.318 km WSW of Stonyford, CaliforniaMon, Sep 27, 10:51 PM PDT · 18268 days ago · 11 km deep · 97 km away
13. 1.821 km NNW of Shelter Cove, CaliforniaWed, Sep 29, 7:23 AM PDT · 18267 days ago · 4 km deep · 85 km away
14. 1.817 km E of Redcrest, CaliforniaWed, Sep 29, 9:26 AM PDT · 18267 days ago · 22 km deep · 57 km away
15. 1.622 km SW of Scotia, CaliforniaFri, Oct 1, 7:08 AM PDT · 18265 days ago · 11 km deep · 98 km away
16. 2.010 km ENE of Hydesville, CaliforniaFri, Oct 1, 1:39 PM PDT · 18265 days ago · 22 km deep · 86 km away
17. 1.815 km ESE of Burnt Ranch, CaliforniaTue, Oct 5, 12:48 AM PDT · 18261 days ago · 16 km deep · 70 km away
18. 1.611 km SSW of Scotia, CaliforniaWed, Oct 6, 4:58 PM PDT · 18259 days ago · 25 km deep · 90 km away
19. 1.617 km SW of Trinity Village, CaliforniaWed, Oct 6, 7:59 PM PDT · 18259 days ago · 32 km deep · 82 km away
20. 1.616 km ENE of Weott, CaliforniaSun, Oct 10, 4:43 PM PDT · 18255 days ago · 29 km deep · 57 km away
21. 2.114 km W of Mad River, CaliforniaWed, Oct 20, 8:02 PM PDT · 18245 days ago · 22 km deep · 55 km away
22. 1.79 km SE of Pine Hills, CaliforniaSat, Oct 23, 2:09 AM PDT · 18243 days ago · 22 km deep · 98 km away
23. 1.921 km NE of Hydesville, CaliforniaWed, Oct 27, 2:03 AM PDT · 18239 days ago · 22 km deep · 85 km away
24. 2.611 km NNW of Leggett, CaliforniaThu, Oct 28, 11:47 PM PDT · 18237 days ago · 4 km deep · 54 km away
25. 2.30 km ENE of Garberville, CaliforniaSat, Oct 30, 11:25 AM PDT · 18236 days ago · 8 km deep · 54 km away
26. 1.920 km W of Hyampom, CaliforniaMon, Nov 1, 7:24 AM PST · 18234 days ago · 23 km deep · 71 km away
27. 2.77 km E of Redcrest, CaliforniaSat, Nov 6, 5:17 AM PST · 18229 days ago · 22 km deep · 66 km away

Before

1. 2.57 km W of Ruth, CaliforniaThu, Sep 9, 5:35 AM PDT · 18287 days ago · 37 km deep · 25 km away
2. 2.5Northern CaliforniaThu, Sep 9, 3:35 AM PDT · 18287 days ago · 26 km deep · 43 km away
3. 2.720 km WSW of Stonyford, CaliforniaSat, Sep 4, 3:52 AM PDT · 18292 days ago · 12 km deep · 98 km away
4. 1.67 km NNW of Alderpoint, CaliforniaFri, Sep 3, 11:16 AM PDT · 18293 days ago · 27 km deep · 44 km away
5. 3.36 km ESE of Bella Vista, CaliforniaWed, Sep 1, 3:42 PM PDT · 18294 days ago · 5 km deep · 100 km away
6. 1.812 km ENE of Hydesville, CaliforniaWed, Sep 1, 2:04 AM PDT · 18295 days ago · 21 km deep · 86 km away
7. 2.421 km NNE of Upper Lake, CaliforniaTue, Aug 31, 10:03 PM PDT · 18295 days ago · 4 km deep · 91 km away
8. 2.417 km W of Stonyford, CaliforniaSun, Aug 29, 5:59 PM PDT · 18297 days ago · 11 km deep · 94 km away
9. 3.28 km N of Leggett, CaliforniaWed, Aug 25, 11:04 PM PDT · 18301 days ago · 4 km deep · 53 km away
10. 2.4near the coast of Northern CaliforniaWed, Aug 25, 5:28 AM PDT · 18302 days ago · 21 km deep · 52 km away
11. 2.1Northern CaliforniaTue, Aug 24, 9:11 PM PDT · 18302 days ago · 16 km deep · 55 km away
12. 2.56 km N of Leggett, CaliforniaMon, Aug 23, 11:29 PM PDT · 18303 days ago · 4 km deep · 53 km away
13. 2.110 km NNE of Leggett, CaliforniaMon, Aug 23, 2:35 AM PDT · 18304 days ago · 7 km deep · 50 km away
14. 1.611 km ESE of Benbow, CaliforniaSun, Aug 22, 10:44 PM PDT · 18304 days ago · 10 km deep · 46 km away
15. 1.62 km N of Miranda, CaliforniaSun, Aug 22, 9:07 PM PDT · 18304 days ago · 11 km deep · 58 km away
16. 1.66 km ESE of Benbow, CaliforniaSun, Aug 22, 8:10 PM PDT · 18304 days ago · 11 km deep · 48 km away
17. 1.87 km SSE of Benbow, CaliforniaSun, Aug 22, 5:52 PM PDT · 18304 days ago · 12 km deep · 52 km away
18. 2.31 km ESE of Benbow, CaliforniaSun, Aug 22, 1:01 AM PDT · 18305 days ago · 10 km deep · 53 km away
19. 2.67 km NNE of Leggett, CaliforniaSun, Aug 22, 12:43 AM PDT · 18305 days ago · 5 km deep · 51 km away
20. 2.26 km ENE of Benbow, CaliforniaSat, Aug 21, 7:03 PM PDT · 18305 days ago · 13 km deep · 48 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1031441. Read Sun, Oct 4, 2026, 9:20 AM UTC.