M2.2 earthquake 40 km ESE of Ruth, California

Magnitude

2.2 (md), micro

Local time

Sat, Nov 21, 1987, 11:28 PM PST

UTC

1987-11-22 07:28:19 UTC

Depth

6.8 km (4.2 mi), shallow

Epicenter

40.152° N, 122.872° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 1.5 km in depth

Magnitude uncertainty

±0.06

Depth from

From location

Station coverage gap

136°

Stations used

12

• Rancho Tehama Reserve, CaliforniaPopulation 1,485. Forecast43 kmWNW
• Red Bluff, CaliforniaPopulation 14,131. Forecast54 kmW
• Chico, CaliforniaPopulation 121,345. Forecast100 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast792 kmNNW

After

1. 3.040 km ESE of Ruth, CaliforniaSun, Nov 22, 1:32 AM PST · 14185 days ago · -1 km deep · 5 km away
2. 1.916 km NNE of Upper Lake, CaliforniaSun, Nov 22, 5:31 PM PST · 14184 days ago · 4 km deep · 95 km away
3. 2.340 km E of Ruth, CaliforniaTue, Nov 24, 7:05 PM PST · 14182 days ago · 2 km deep · 7 km away
4. 2.812 km S of Laytonville, CaliforniaWed, Nov 25, 7:00 PM PST · 14181 days ago · 0 km deep · 84 km away
5. 2.536 km NW of Paskenta, CaliforniaThu, Nov 26, 7:48 AM PST · 14181 days ago · 4 km deep · 6 km away
6. 2.236 km SE of Ruth, CaliforniaThu, Nov 26, 9:15 AM PST · 14181 days ago · -1 km deep · 12 km away
7. 1.826 km NW of Paskenta, CaliforniaThu, Nov 26, 9:35 AM PST · 14181 days ago · 4 km deep · 14 km away
8. 1.936 km NW of Paskenta, CaliforniaThu, Nov 26, 10:08 AM PST · 14181 days ago · -1 km deep · 5 km away
9. 2.013 km WNW of Covelo, CaliforniaThu, Nov 26, 12:04 PM PST · 14180 days ago · 4 km deep · 57 km away
10. 1.613 km SSE of Laytonville, CaliforniaThu, Nov 26, 11:35 PM PST · 14180 days ago · 5 km deep · 77 km away
11. 1.939 km E of Ruth, CaliforniaFri, Nov 27, 4:38 AM PST · 14180 days ago · 4 km deep · 6 km away
12. 1.920 km ENE of Potter Valley, CaliforniaMon, Nov 30, 12:31 AM PST · 14177 days ago · 7 km deep · 85 km away
13. 3.436 km NW of Paskenta, CaliforniaTue, Dec 1, 3:15 AM PST · 14176 days ago · -1 km deep · 7 km away
14. 3.739 km NW of Paskenta, CaliforniaTue, Dec 1, 6:53 AM PST · 14176 days ago · 6 km deep · 1 km away
15. 2.435 km NW of Paskenta, CaliforniaWed, Dec 2, 3:25 PM PST · 14174 days ago · 5 km deep · 7 km away
16. 3.233 km NW of Paskenta, CaliforniaWed, Dec 2, 3:56 PM PST · 14174 days ago · -1 km deep · 7 km away
17. 3.937 km NW of Paskenta, CaliforniaWed, Dec 2, 4:00 PM PST · 14174 days ago · 0 km deep · 6 km away
18. 2.339 km ESE of Ruth, CaliforniaWed, Dec 2, 4:08 PM PST · 14174 days ago · -1 km deep · 2 km away
19. 3.438 km WNW of Rancho Tehama Reserve, CaliforniaWed, Dec 2, 4:18 PM PST · 14174 days ago · -1 km deep · 7 km away
20. 2.138 km NW of Paskenta, CaliforniaWed, Dec 2, 4:24 PM PST · 14174 days ago · -1 km deep · 2 km away
21. 2.17 km E of Potter Valley, CaliforniaThu, Dec 3, 6:27 PM PST · 14173 days ago · 0 km deep · 94 km away
22. 2.338 km NW of Paskenta, CaliforniaFri, Dec 4, 5:42 PM PST · 14172 days ago · -1 km deep · 3 km away
23. 2.24 km NNE of Ruth, CaliforniaFri, Dec 4, 7:33 PM PST · 14172 days ago · 4 km deep · 40 km away
24. 2.03 km SSW of Palo Cedro, CaliforniaSat, Dec 5, 7:44 AM PST · 14172 days ago · 9 km deep · 67 km away
25. 2.14 km SW of Hamilton City, CaliforniaSat, Dec 5, 1:46 PM PST · 14171 days ago · 16 km deep · 85 km away
26. 1.93 km S of Nord, CaliforniaTue, Dec 8, 11:55 PM PST · 14168 days ago · 18 km deep · 90 km away
27. 2.03 km SE of Hamilton City, CaliforniaTue, Dec 8, 11:57 PM PST · 14168 days ago · 13 km deep · 89 km away
28. 2.9near the coast of Northern CaliforniaThu, Dec 10, 8:52 AM PST · 14167 days ago · -1 km deep · 93 km away
29. 2.04 km NNW of Palo Cedro, CaliforniaWed, Dec 16, 3:06 AM PST · 14161 days ago · 4 km deep · 73 km away
30. 2.918 km NNE of Upper Lake, CaliforniaWed, Dec 16, 5:02 PM PST · 14160 days ago · 3 km deep · 92 km away
31. 2.116 km ENE of Willows, CaliforniaFri, Dec 18, 7:45 AM PST · 14159 days ago · 21 km deep · 99 km away
32. 2.341 km WNW of Rancho Tehama Reserve, CaliforniaFri, Dec 18, 10:18 PM PST · 14158 days ago · 4 km deep · 7 km away
33. 2.430 km W of Paskenta, CaliforniaSat, Dec 19, 1:47 AM PST · 14158 days ago · -1 km deep · 27 km away
34. 2.57 km NE of Miranda, CaliforniaSat, Dec 26, 3:30 PM PST · 14150 days ago · 8 km deep · 78 km away
35. 2.29 km SE of Bend, CaliforniaSun, Jan 3, 5:26 AM PST · 14143 days ago · -1 km deep · 64 km away
36. 2.35 km ENE of Douglas City, CaliforniaSun, Jan 3, 7:27 AM PST · 14143 days ago · 10 km deep · 57 km away
37. 1.55 km WSW of Bella Vista, CaliforniaMon, Jan 4, 10:45 AM PST · 14142 days ago · 2 km deep · 72 km away
38. 1.9Northern CaliforniaTue, Jan 5, 8:02 AM PST · 14141 days ago · 8 km deep · 60 km away
39. 1.95 km ENE of Bella Vista, CaliforniaWed, Jan 6, 9:49 PM PST · 14139 days ago · 4 km deep · 82 km away
40. 2.516 km N of Weaverville, CaliforniaThu, Jan 7, 7:43 AM PST · 14139 days ago · 21 km deep · 81 km away
41. 3.027 km E of Covelo, CaliforniaThu, Jan 7, 8:27 AM PST · 14139 days ago · 4 km deep · 38 km away
42. 1.73 km WNW of Central Valley (historical), CaliforniaSat, Jan 9, 5:33 PM PST · 14136 days ago · -1 km deep · 72 km away
43. 1.713 km ESE of Paynes Creek, CaliforniaFri, Jan 15, 1:58 AM PST · 14131 days ago · 3 km deep · 95 km away
44. 2.34 km NNW of Redwood Valley, CaliforniaSat, Jan 16, 2:14 AM PST · 14130 days ago · 9 km deep · 99 km away
45. 1.74 km NNW of Palo Cedro, CaliforniaTue, Jan 19, 5:58 PM PST · 14126 days ago · 21 km deep · 72 km away

Before

1. 2.518 km NE of Potter Valley, CaliforniaFri, Nov 13, 8:08 AM PST · 14194 days ago · 7 km deep · 81 km away
2. 3.813 km SE of Trinity Center, CaliforniaFri, Nov 13, 2:25 AM PST · 14194 days ago · 4 km deep · 87 km away
3. 2.47 km E of Willits, CaliforniaFri, Nov 13, 12:01 AM PST · 14194 days ago · 1 km deep · 90 km away
4. 2.427 km SSE of Covelo, CaliforniaMon, Nov 9, 1:39 AM PST · 14198 days ago · 4 km deep · 65 km away
5. 3.111 km ENE of Cleone, CaliforniaSat, Nov 7, 2:15 PM PST · 14199 days ago · 0 km deep · 97 km away
6. 1.75 km ENE of Nord, CaliforniaSat, Nov 7, 12:50 AM PST · 14200 days ago · 27 km deep · 91 km away
7. 2.42 km NNW of French Gulch, CaliforniaFri, Nov 6, 7:33 AM PST · 14201 days ago · 4 km deep · 66 km away
8. 1.614 km NE of Potter Valley, CaliforniaThu, Nov 5, 7:00 PM PST · 14201 days ago · 4 km deep · 82 km away
9. 1.63 km SW of Palo Cedro, CaliforniaThu, Nov 5, 3:14 PM PST · 14201 days ago · 8 km deep · 67 km away
10. 2.33 km W of Palo Cedro, CaliforniaThu, Nov 5, 3:43 AM PST · 14202 days ago · 18 km deep · 68 km away
11. 2.523 km NNE of Redcrest, CaliforniaTue, Nov 3, 5:09 PM PST · 14203 days ago · 4 km deep · 94 km away
12. 2.717 km NE of Phillipsville, CaliforniaFri, Oct 30, 4:55 AM PST · 14208 days ago · 4 km deep · 71 km away
13. 1.922 km NE of Potter Valley, CaliforniaThu, Oct 29, 3:26 PM PST · 14208 days ago · 11 km deep · 76 km away
14. 2.321 km NE of Potter Valley, CaliforniaMon, Oct 26, 9:23 PM PST · 14211 days ago · 11 km deep · 77 km away
15. 2.3Northern CaliforniaSun, Oct 25, 8:34 PM PST · 14212 days ago · 4 km deep · 87 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc10085607. Read Wed, Sep 23, 2026, 6:20 AM UTC.