M2.1 earthquake 3 km NNW of Biggs, California

Magnitude

2.1 (md), micro

Local time

Wed, Jul 24, 1985, 3:08 PM PDT

UTC

1985-07-24 22:08:24 UTC

Depth

10.7 km (6.7 mi), shallow

Epicenter

39.438° N, 121.732° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 7.1 km horizontally, 1.6 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

260°, poorly surrounded by stations

Stations used

6

• Biggs, CaliforniaPopulation 1,704. Forecast3 kmNNW
• Oroville, CaliforniaPopulation 16,260. Forecast17 kmWSW
• Chico, CaliforniaPopulation 121,345. Forecast34 kmSSE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast675 kmNNW

After

1. 1.79 km ESE of Hidden Valley Lake, CaliforniaThu, Jul 25, 12:47 AM PDT · 15040 days ago · 7 km deep · 96 km away
2. 2.615 km ENE of Willows, CaliforniaSat, Jul 27, 11:30 AM PDT · 15038 days ago · 14 km deep · 28 km away
3. 1.89 km NW of Cohasset, CaliforniaSat, Jul 27, 5:00 PM PDT · 15038 days ago · 6 km deep · 62 km away
4. 1.79 km NW of Cohasset, CaliforniaSat, Jul 27, 5:20 PM PDT · 15038 days ago · -1 km deep · 62 km away
5. 2.125 km WNW of Elk Creek, CaliforniaMon, Jul 29, 5:54 AM PDT · 15036 days ago · 4 km deep · 96 km away
6. 2.324 km WNW of Elk Creek, CaliforniaMon, Jul 29, 6:58 PM PDT · 15036 days ago · 2 km deep · 96 km away
7. 1.624 km WNW of Elk Creek, CaliforniaMon, Jul 29, 7:25 PM PDT · 15036 days ago · 4 km deep · 95 km away
8. 3.313 km N of Princeton, CaliforniaMon, Jul 29, 7:34 PM PDT · 15036 days ago · 12 km deep · 26 km away
9. 1.59 km NE of Vina, CaliforniaFri, Aug 2, 4:26 PM PDT · 15032 days ago · 7 km deep · 64 km away
10. 2.021 km NNE of Upper Lake, CaliforniaSat, Aug 3, 10:27 AM PDT · 15031 days ago · 6 km deep · 97 km away
11. 2.45 km NNE of Belden, CaliforniaTue, Aug 6, 12:18 AM PDT · 15028 days ago · -1 km deep · 81 km away
12. 1.93 km SE of Prattville, CaliforniaTue, Aug 6, 3:41 AM PDT · 15028 days ago · 3 km deep · 98 km away
13. 2.03 km ESE of Prattville, CaliforniaTue, Aug 6, 3:42 AM PDT · 15028 days ago · 11 km deep · 99 km away
14. 2.015 km SW of Paskenta, CaliforniaWed, Aug 7, 8:32 AM PDT · 15027 days ago · 6 km deep · 91 km away
15. 1.910 km SW of Williams, CaliforniaWed, Aug 7, 11:27 AM PDT · 15027 days ago · 15 km deep · 58 km away
16. 2.08 km SSW of Colusa, CaliforniaFri, Aug 9, 2:31 AM PDT · 15025 days ago · 6 km deep · 43 km away
17. 1.512 km E of Paynes Creek, CaliforniaSat, Aug 10, 1:24 AM PDT · 15024 days ago · 11 km deep · 99 km away
18. 3.65 km SSW of Canyondam, CaliforniaSun, Aug 11, 11:49 PM PDT · 15022 days ago · -2 km deep · 94 km away
19. 1.93 km SW of Canyondam, CaliforniaMon, Aug 12, 12:18 AM PDT · 15022 days ago · 3 km deep · 96 km away
20. 2.19 km E of Hidden Valley Lake, CaliforniaMon, Aug 12, 11:04 AM PDT · 15022 days ago · 7 km deep · 93 km away
21. 1.84 km S of Hamilton City, CaliforniaMon, Aug 12, 7:10 PM PDT · 15022 days ago · 5 km deep · 38 km away
22. 2.39 km SE of Rancho Tehama Reserve, CaliforniaTue, Aug 13, 12:24 AM PDT · 15021 days ago · 5 km deep · 77 km away
23. 2.08 km NE of Vina, CaliforniaFri, Aug 16, 3:33 PM PDT · 15018 days ago · 1 km deep · 64 km away
24. 2.022 km WSW of Williams, CaliforniaSat, Aug 17, 12:31 PM PDT · 15017 days ago · 3 km deep · 69 km away
25. 1.613 km ENE of Clearlake Oaks, CaliforniaSat, Aug 17, 6:25 PM PDT · 15017 days ago · 5 km deep · 80 km away
26. 1.52 km NNW of Clearlake, CaliforniaSat, Aug 17, 10:16 PM PDT · 15016 days ago · 2 km deep · 93 km away
27. 3.14 km S of Prattville, CaliforniaSun, Aug 18, 9:43 PM PDT · 15015 days ago · -2 km deep · 95 km away
28. 2.14 km SSE of Canyondam, CaliforniaMon, Aug 19, 3:59 AM PDT · 15015 days ago · 2 km deep · 97 km away
29. 1.63 km ESE of Prattville, CaliforniaMon, Aug 19, 1:19 PM PDT · 15015 days ago · 3 km deep · 99 km away
30. 2.23 km SE of Prattville, CaliforniaTue, Aug 20, 10:51 AM PDT · 15014 days ago · 7 km deep · 98 km away
31. 1.99 km WNW of Cohasset, CaliforniaThu, Aug 22, 4:22 PM PDT · 15012 days ago · 16 km deep · 58 km away
32. 2.93 km NNE of Clearlake, CaliforniaSat, Aug 24, 6:13 AM PDT · 15010 days ago · 1 km deep · 91 km away
33. 1.63 km NNE of Clearlake, CaliforniaSat, Aug 24, 7:55 AM PDT · 15010 days ago · -1 km deep · 91 km away
34. 1.63 km N of Clearlake, CaliforniaSat, Aug 24, 8:59 PM PDT · 15010 days ago · -1 km deep · 91 km away
35. 3.24 km N of Belden, CaliforniaSun, Aug 25, 3:28 AM PDT · 15009 days ago · 0 km deep · 80 km away
36. 1.65 km NNE of Belden, CaliforniaSun, Aug 25, 3:34 AM PDT · 15009 days ago · 0 km deep · 80 km away
37. 1.75 km NNE of Belden, CaliforniaSun, Aug 25, 3:43 AM PDT · 15009 days ago · 3 km deep · 81 km away
38. 1.64 km N of Belden, CaliforniaSun, Aug 25, 8:01 PM PDT · 15009 days ago · 4 km deep · 80 km away
39. 2.520 km WSW of Williams, CaliforniaThu, Aug 29, 6:19 PM PDT · 15005 days ago · 2 km deep · 66 km away
40. 2.220 km WSW of Williams, CaliforniaThu, Aug 29, 6:35 PM PDT · 15005 days ago · 0 km deep · 67 km away
41. 2.021 km WSW of Williams, CaliforniaThu, Aug 29, 7:00 PM PDT · 15005 days ago · 2 km deep · 68 km away
42. 2.420 km WSW of Williams, CaliforniaSun, Sep 1, 11:38 PM PDT · 15001 days ago · 2 km deep · 67 km away
43. 2.620 km WSW of Williams, CaliforniaMon, Sep 2, 12:15 AM PDT · 15001 days ago · 2 km deep · 66 km away
44. 1.63 km NNW of Belden, CaliforniaMon, Sep 2, 1:01 AM PDT · 15001 days ago · 1 km deep · 78 km away
45. 1.922 km WSW of Williams, CaliforniaMon, Sep 2, 9:45 AM PDT · 15001 days ago · 2 km deep · 68 km away
46. 1.614 km ENE of Clearlake Oaks, CaliforniaMon, Sep 2, 4:14 PM PDT · 15001 days ago · 10 km deep · 79 km away
47. 2.14 km NW of Spring Garden, CaliforniaTue, Sep 3, 3:15 AM PDT · 15000 days ago · 4 km deep · 95 km away
48. 1.813 km ESE of Mineral, CaliforniaTue, Sep 3, 5:33 PM PDT · 15000 days ago · 8 km deep · 100 km away
49. 3.49 km NNW of Princeton, CaliforniaSat, Sep 7, 10:13 PM PDT · 14995 days ago · 19 km deep · 28 km away
50. 1.59 km ESE of Hidden Valley Lake, CaliforniaMon, Sep 9, 8:59 PM PDT · 14994 days ago · 4 km deep · 98 km away
51. 1.920 km NE of Upper Lake, CaliforniaTue, Sep 10, 3:44 PM PDT · 14993 days ago · -1 km deep · 91 km away
52. 1.812 km NE of Upper Lake, CaliforniaThu, Sep 12, 8:59 AM PDT · 14991 days ago · 2 km deep · 95 km away
53. 2.2Northern CaliforniaThu, Sep 12, 7:01 PM PDT · 14991 days ago · 2 km deep · 94 km away
54. 2.512 km NE of Upper Lake, CaliforniaFri, Sep 13, 12:07 PM PDT · 14990 days ago · 3 km deep · 94 km away
55. 2.44 km E of Williams, CaliforniaFri, Sep 13, 4:22 PM PDT · 14990 days ago · 16 km deep · 45 km away
56. 1.812 km NE of Upper Lake, CaliforniaFri, Sep 13, 7:29 PM PDT · 14990 days ago · 2 km deep · 94 km away
57. 1.612 km NE of Upper Lake, CaliforniaSat, Sep 14, 11:08 AM PDT · 14989 days ago · 4 km deep · 96 km away
58. 2.05 km NE of Williams, CaliforniaSun, Sep 15, 2:49 PM PDT · 14988 days ago · 18 km deep · 42 km away
59. 1.86 km E of Williams, CaliforniaSun, Sep 15, 6:28 PM PDT · 14988 days ago · 4 km deep · 43 km away
60. 2.55 km ENE of Williams, CaliforniaTue, Sep 17, 8:44 PM PDT · 14986 days ago · 10 km deep · 43 km away

The first 60 of 66.

Before

1. 3.14 km NNE of Belden, CaliforniaMon, Jul 22, 11:48 AM PDT · 15043 days ago · -1 km deep · 80 km away
2. 2.34 km NNE of East Quincy, CaliforniaSun, Jul 21, 9:16 PM PDT · 15043 days ago · 7 km deep · 95 km away
3. 2.28 km ENE of Artois, CaliforniaSun, Jul 21, 4:07 PM PDT · 15044 days ago · 5 km deep · 39 km away
4. 2.85 km NNE of Belden, CaliforniaSun, Jul 21, 2:54 PM PDT · 15044 days ago · -1 km deep · 81 km away
5. 1.812 km WSW of Durham, CaliforniaSat, Jul 20, 6:19 PM PDT · 15045 days ago · 18 km deep · 26 km away
6. 1.713 km NE of Hidden Valley Lake, CaliforniaSat, Jul 20, 8:02 AM PDT · 15045 days ago · 14 km deep · 87 km away
7. 2.14 km S of Hamilton City, CaliforniaSun, Jul 14, 4:31 PM PDT · 15051 days ago · 13 km deep · 38 km away
8. 2.27 km SSW of Colusa, CaliforniaSun, Jul 14, 1:55 AM PDT · 15051 days ago · 15 km deep · 42 km away
9. 1.728 km NE of Potter Valley, CaliforniaThu, Jul 11, 6:27 PM PDT · 15054 days ago · 8 km deep · 100 km away
10. 2.28 km WSW of Hamilton City, CaliforniaWed, Jul 10, 2:55 PM PDT · 15055 days ago · 16 km deep · 43 km away
11. 1.98 km WSW of Meridian, CaliforniaTue, Jul 9, 4:20 AM PDT · 15056 days ago · 4 km deep · 44 km away
12. 2.28 km ESE of Willows, CaliforniaSat, Jul 6, 8:02 PM PDT · 15059 days ago · 14 km deep · 32 km away
13. 2.18 km N of Princeton, CaliforniaSat, Jul 6, 7:58 PM PDT · 15059 days ago · 0 km deep · 25 km away
14. 2.37 km SW of Colusa, CaliforniaFri, Jul 5, 4:10 AM PDT · 15060 days ago · 15 km deep · 42 km away
15. 1.76 km NE of Williams, CaliforniaThu, Jul 4, 3:02 PM PDT · 15061 days ago · 12 km deep · 41 km away
16. 2.17 km SSW of Colusa, CaliforniaThu, Jul 4, 6:44 AM PDT · 15061 days ago · 13 km deep · 42 km away
17. 1.812 km ESE of Mineral, CaliforniaTue, Jul 2, 10:12 AM PDT · 15063 days ago · 9 km deep · 100 km away
18. 1.64 km SSE of Rocklin, CaliforniaMon, Jul 1, 6:31 PM PDT · 15064 days ago · 12 km deep · 88 km away
19. 1.74 km SSE of Rocklin, CaliforniaMon, Jul 1, 5:02 PM PDT · 15064 days ago · 12 km deep · 88 km away
20. 2.74 km SSE of Rocklin, CaliforniaMon, Jul 1, 4:02 PM PDT · 15064 days ago · 11 km deep · 88 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc51701. Read Mon, Sep 28, 2026, 3:34 PM UTC.