M1.6 earthquake 7 km NNW of Alderpoint, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Sep 3, 1976, 11:16 AM PDT

UTC

1976-09-03 18:16:33 UTC

Depth

27.3 km (17.0 mi), shallow

Epicenter

40.232° N, 123.658° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.6 km horizontally, 1.3 km in depth

Depth from

From location

Station coverage gap

310°, poorly surrounded by stations

Stations used

4

• Miranda, CaliforniaPopulation 520. Forecast14 kmE
• Fortuna, CaliforniaPopulation 12,000. Forecast59 kmSE
• Chico, CaliforniaPopulation 121,345. Forecast165 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast838 kmNNW

After

1. 1.71 km NW of Humboldt Hill, CaliforniaMon, Sep 6, 4:13 PM PDT · 18290 days ago · 10 km deep · 72 km away
2. 1.61 km NE of Fields Landing, CaliforniaMon, Sep 6, 4:34 PM PDT · 18290 days ago · 12 km deep · 72 km away
3. 1.91 km NNW of Humboldt Hill, CaliforniaTue, Sep 7, 3:19 AM PDT · 18289 days ago · 10 km deep · 72 km away
4. 1.71 km NNW of Humboldt Hill, CaliforniaTue, Sep 7, 8:18 AM PDT · 18289 days ago · 10 km deep · 72 km away
5. 1.71 km NNW of Humboldt Hill, CaliforniaTue, Sep 7, 3:27 PM PDT · 18289 days ago · 9 km deep · 72 km away
6. 1.80 km NNW of Humboldt Hill, CaliforniaTue, Sep 7, 3:58 PM PDT · 18289 days ago · 10 km deep · 72 km away
7. 1.520 km SW of Ferndale, CaliforniaThu, Sep 9, 12:03 AM PDT · 18287 days ago · 22 km deep · 69 km away
8. 2.5Northern CaliforniaThu, Sep 9, 3:35 AM PDT · 18287 days ago · 26 km deep · 13 km away
9. 2.513 km WSW of Ferndale, CaliforniaThu, Sep 9, 3:59 AM PDT · 18287 days ago · 22 km deep · 72 km away
10. 2.57 km W of Ruth, CaliforniaThu, Sep 9, 5:35 AM PDT · 18287 days ago · 37 km deep · 22 km away
11. 2.520 km SE of Ruth, CaliforniaThu, Sep 9, 5:45 AM PDT · 18287 days ago · 38 km deep · 44 km away
12. 2.116 km SW of Mad River, CaliforniaThu, Sep 9, 8:44 AM PDT · 18287 days ago · 25 km deep · 12 km away
13. 1.613 km WSW of Scotia, CaliforniaThu, Sep 9, 10:21 PM PDT · 18286 days ago · 25 km deep · 55 km away
14. 1.63 km W of Phillipsville, CaliforniaFri, Sep 10, 3:04 AM PDT · 18286 days ago · -1 km deep · 14 km away
15. 2.36 km SSE of Pine Hills, CaliforniaFri, Sep 10, 12:19 PM PDT · 18286 days ago · 19 km deep · 64 km away
16. 2.133 km SSW of Ferndale, CaliforniaSat, Sep 11, 9:39 AM PDT · 18285 days ago · 23 km deep · 70 km away
17. 1.612 km ENE of Hydesville, CaliforniaSun, Sep 12, 3:09 AM PDT · 18284 days ago · 20 km deep · 48 km away
18. 1.60 km W of Fortuna, CaliforniaSun, Sep 12, 5:07 AM PDT · 18284 days ago · 19 km deep · 59 km away
19. 2.846 km WSW of Ferndale, CaliforniaMon, Sep 13, 2:15 AM PDT · 18283 days ago · 23 km deep · 99 km away
20. 1.545 km WSW of Ferndale, CaliforniaMon, Sep 13, 2:25 AM PDT · 18283 days ago · 19 km deep · 99 km away
21. 1.828 km WSW of Ferndale, CaliforniaMon, Sep 13, 6:55 AM PDT · 18283 days ago · 23 km deep · 81 km away
22. 4.844 km SSW of Ferndale, CaliforniaMon, Sep 13, 9:08 AM PDT · 18283 days ago · 33 km deep · 73 km away
23. 4.035 km SW of Ferndale, CaliforniaMon, Sep 13, 9:09 AM PDT · 18283 days ago · 27 km deep · 73 km away
24. 2.528 km SSW of Ferndale, CaliforniaMon, Sep 13, 9:27 AM PDT · 18283 days ago · 23 km deep · 66 km away
25. 2.919 km SSW of Ferndale, CaliforniaMon, Sep 13, 9:55 AM PDT · 18283 days ago · 23 km deep · 63 km away
26. 1.629 km SW of Ferndale, CaliforniaMon, Sep 13, 9:59 AM PDT · 18283 days ago · 21 km deep · 74 km away
27. 1.525 km SSW of Ferndale, CaliforniaMon, Sep 13, 10:35 AM PDT · 18283 days ago · 23 km deep · 64 km away
28. 3.236 km SW of Ferndale, CaliforniaMon, Sep 13, 12:32 PM PDT · 18283 days ago · 28 km deep · 73 km away
29. 1.611 km S of Ferndale, CaliforniaMon, Sep 13, 1:37 PM PDT · 18283 days ago · 4 km deep · 57 km away
30. 1.735 km WSW of Ferndale, CaliforniaMon, Sep 13, 1:58 PM PDT · 18283 days ago · 28 km deep · 88 km away
31. 2.034 km SW of Ferndale, CaliforniaTue, Sep 14, 5:30 AM PDT · 18282 days ago · 21 km deep · 73 km away
32. 1.933 km SSW of Ferndale, CaliforniaTue, Sep 14, 6:18 AM PDT · 18282 days ago · 23 km deep · 69 km away
33. 2.932 km SSW of Ferndale, CaliforniaWed, Sep 15, 8:36 AM PDT · 18281 days ago · 20 km deep · 67 km away
34. 3.432 km SW of Ferndale, CaliforniaWed, Sep 15, 4:52 PM PDT · 18281 days ago · 25 km deep · 71 km away
35. 1.724 km WSW of Scotia, CaliforniaWed, Sep 15, 5:17 PM PDT · 18281 days ago · 16 km deep · 60 km away
36. 1.732 km SW of Ferndale, CaliforniaThu, Sep 16, 2:43 AM PDT · 18280 days ago · 21 km deep · 73 km away
37. 3.032 km NNE of Potter Valley, CaliforniaFri, Sep 17, 4:09 AM PDT · 18279 days ago · 15 km deep · 97 km away
38. 2.89 km WSW of Rio Dell, CaliforniaSat, Sep 18, 3:57 PM PDT · 18278 days ago · 24 km deep · 54 km away
39. 1.91 km NW of Humboldt Hill, CaliforniaSat, Sep 18, 11:53 PM PDT · 18277 days ago · 9 km deep · 72 km away
40. 1.927 km W of Indianola, CaliforniaSun, Sep 19, 6:22 AM PDT · 18277 days ago · 21 km deep · 93 km away
41. 1.51 km NW of Humboldt Hill, CaliforniaSun, Sep 19, 2:45 PM PDT · 18277 days ago · 9 km deep · 73 km away
42. 3.625 km W of Ferndale, CASun, Sep 19, 8:33 PM PDT · 18276 days ago · 22 km deep · 84 km away
43. 3.00 km NW of Humboldt Hill, CaliforniaMon, Sep 20, 2:09 PM PDT · 18276 days ago · 10 km deep · 72 km away
44. 3.00 km NNW of Humboldt Hill, CaliforniaMon, Sep 20, 3:23 PM PDT · 18276 days ago · 10 km deep · 72 km away
45. 1.91 km WNW of Humboldt Hill, CaliforniaMon, Sep 20, 3:43 PM PDT · 18276 days ago · 0 km deep · 72 km away
46. 1.78 km WSW of Rio Dell, CaliforniaWed, Sep 22, 6:56 PM PDT · 18273 days ago · 21 km deep · 54 km away
47. 3.239 km SW of Ferndale, CaliforniaThu, Sep 23, 12:28 AM PDT · 18273 days ago · 23 km deep · 79 km away
48. 1.727 km SW of Ferndale, CaliforniaThu, Sep 23, 1:18 AM PDT · 18273 days ago · 21 km deep · 73 km away
49. 2.137 km SSW of Ferndale, CaliforniaThu, Sep 23, 3:41 PM PDT · 18273 days ago · 28 km deep · 72 km away
50. 1.58 km SSW of Ferndale, CaliforniaFri, Sep 24, 9:49 AM PDT · 18272 days ago · 21 km deep · 61 km away
51. 3.033 km SW of Ferndale, CaliforniaFri, Sep 24, 7:26 PM PDT · 18271 days ago · 25 km deep · 76 km away
52. 2.75 km SSE of Leggett, CaliforniaSat, Sep 25, 11:20 AM PDT · 18271 days ago · 13 km deep · 45 km away
53. 2.827 km WSW of Ferndale, CaliforniaMon, Sep 27, 1:05 AM PDT · 18269 days ago · 24 km deep · 78 km away
54. 1.523 km SSW of Ferndale, CaliforniaMon, Sep 27, 8:35 AM PDT · 18269 days ago · 22 km deep · 66 km away
55. 1.730 km SW of Ferndale, CaliforniaTue, Sep 28, 11:08 AM PDT · 18268 days ago · 21 km deep · 73 km away
56. 1.821 km NNW of Shelter Cove, CaliforniaWed, Sep 29, 7:23 AM PDT · 18267 days ago · 4 km deep · 43 km away
57. 1.817 km E of Redcrest, CaliforniaWed, Sep 29, 9:26 AM PDT · 18267 days ago · 22 km deep · 20 km away
58. 2.533 km SW of Ferndale, CaliforniaThu, Sep 30, 4:26 PM PDT · 18266 days ago · 25 km deep · 73 km away
59. 1.731 km SW of Ferndale, CaliforniaThu, Sep 30, 11:49 PM PDT · 18265 days ago · 19 km deep · 72 km away
60. 1.622 km SW of Scotia, CaliforniaFri, Oct 1, 7:08 AM PDT · 18265 days ago · 11 km deep · 54 km away

The first 60 of 93.

Before

1. 1.812 km ENE of Hydesville, CaliforniaWed, Sep 1, 2:04 AM PDT · 18295 days ago · 21 km deep · 49 km away
2. 3.528 km SW of Ferndale, CaliforniaSun, Aug 29, 3:04 PM PDT · 18298 days ago · 28 km deep · 74 km away
3. 2.828 km W of Indianola, CaliforniaFri, Aug 27, 6:42 PM PDT · 18299 days ago · 23 km deep · 92 km away
4. 1.610 km WNW of Ferndale, CaliforniaThu, Aug 26, 12:09 AM PDT · 18301 days ago · 4 km deep · 74 km away
5. 3.28 km N of Leggett, CaliforniaWed, Aug 25, 11:04 PM PDT · 18301 days ago · 4 km deep · 33 km away
6. 1.729 km SW of Scotia, CaliforniaWed, Aug 25, 9:33 AM PDT · 18302 days ago · 22 km deep · 60 km away
7. 2.4near the coast of Northern CaliforniaWed, Aug 25, 5:28 AM PDT · 18302 days ago · 21 km deep · 34 km away
8. 2.1Northern CaliforniaTue, Aug 24, 9:11 PM PDT · 18302 days ago · 16 km deep · 13 km away
9. 2.56 km N of Leggett, CaliforniaMon, Aug 23, 11:29 PM PDT · 18303 days ago · 4 km deep · 34 km away
10. 2.110 km NNE of Leggett, CaliforniaMon, Aug 23, 2:35 AM PDT · 18304 days ago · 7 km deep · 31 km away
11. 1.611 km ESE of Benbow, CaliforniaSun, Aug 22, 10:44 PM PDT · 18304 days ago · 10 km deep · 24 km away
12. 1.62 km N of Miranda, CaliforniaSun, Aug 22, 9:07 PM PDT · 18304 days ago · 11 km deep · 14 km away
13. 1.66 km ESE of Benbow, CaliforniaSun, Aug 22, 8:10 PM PDT · 18304 days ago · 11 km deep · 21 km away
14. 1.87 km SSE of Benbow, CaliforniaSun, Aug 22, 5:52 PM PDT · 18305 days ago · 12 km deep · 26 km away
15. 2.31 km ESE of Benbow, CaliforniaSun, Aug 22, 1:01 AM PDT · 18305 days ago · 10 km deep · 21 km away
16. 2.67 km NNE of Leggett, CaliforniaSun, Aug 22, 12:43 AM PDT · 18305 days ago · 5 km deep · 34 km away
17. 2.26 km ENE of Benbow, CaliforniaSat, Aug 21, 7:03 PM PDT · 18305 days ago · 13 km deep · 18 km away
18. 1.77 km ESE of Benbow, CaliforniaSat, Aug 21, 6:30 PM PDT · 18305 days ago · 1 km deep · 22 km away
19. 2.019 km S of Alderpoint, CaliforniaSat, Aug 21, 6:25 PM PDT · 18305 days ago · 22 km deep · 26 km away
20. 2.342 km SW of Ferndale, CaliforniaSat, Aug 21, 3:30 PM PDT · 18306 days ago · 20 km deep · 80 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1031321. Read Sun, Oct 4, 2026, 12:41 PM UTC.