M1.9 earthquake 39 km E of Ruth, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Nov 27, 1987, 4:38 AM PST

UTC

1987-11-27 12:38:16 UTC

Depth

3.7 km (2.3 mi), shallow

Epicenter

40.203° N, 122.871° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 3.3 km horizontally, 7.6 km in depth

Magnitude uncertainty

±0.07

Depth from

From location

Station coverage gap

170°

Stations used

4

• Rancho Tehama Reserve, CaliforniaPopulation 1,485. Forecast45 kmWNW
• Red Bluff, CaliforniaPopulation 14,131. Forecast54 kmW
• Chico, CaliforniaPopulation 121,345. Forecast103 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast797 kmNNW

After

1. 1.920 km ENE of Potter Valley, CaliforniaMon, Nov 30, 12:31 AM PST · 14189 days ago · 7 km deep · 90 km away
2. 3.436 km NW of Paskenta, CaliforniaTue, Dec 1, 3:15 AM PST · 14188 days ago · -1 km deep · 12 km away
3. 3.739 km NW of Paskenta, CaliforniaTue, Dec 1, 6:53 AM PST · 14187 days ago · 6 km deep · 6 km away
4. 2.435 km NW of Paskenta, CaliforniaWed, Dec 2, 3:25 PM PST · 14186 days ago · 5 km deep · 9 km away
5. 3.233 km NW of Paskenta, CaliforniaWed, Dec 2, 3:56 PM PST · 14186 days ago · -1 km deep · 12 km away
6. 3.937 km NW of Paskenta, CaliforniaWed, Dec 2, 4:00 PM PST · 14186 days ago · 0 km deep · 8 km away
7. 2.339 km ESE of Ruth, CaliforniaWed, Dec 2, 4:08 PM PST · 14186 days ago · -1 km deep · 4 km away
8. 3.438 km WNW of Rancho Tehama Reserve, CaliforniaWed, Dec 2, 4:18 PM PST · 14186 days ago · -1 km deep · 6 km away
9. 2.138 km NW of Paskenta, CaliforniaWed, Dec 2, 4:24 PM PST · 14186 days ago · -1 km deep · 7 km away
10. 2.17 km E of Potter Valley, CaliforniaThu, Dec 3, 6:27 PM PST · 14185 days ago · 0 km deep · 99 km away
11. 2.338 km NW of Paskenta, CaliforniaFri, Dec 4, 5:42 PM PST · 14184 days ago · -1 km deep · 9 km away
12. 2.24 km NNE of Ruth, CaliforniaFri, Dec 4, 7:33 PM PST · 14184 days ago · 4 km deep · 38 km away
13. 2.03 km SSW of Palo Cedro, CaliforniaSat, Dec 5, 7:44 AM PST · 14183 days ago · 9 km deep · 63 km away
14. 2.14 km SW of Hamilton City, CaliforniaSat, Dec 5, 1:46 PM PST · 14183 days ago · 16 km deep · 88 km away
15. 1.93 km S of Nord, CaliforniaTue, Dec 8, 11:55 PM PST · 14180 days ago · 18 km deep · 93 km away
16. 2.03 km SE of Hamilton City, CaliforniaTue, Dec 8, 11:57 PM PST · 14180 days ago · 13 km deep · 92 km away
17. 2.9near the coast of Northern CaliforniaThu, Dec 10, 8:52 AM PST · 14178 days ago · -1 km deep · 98 km away
18. 2.04 km NNW of Palo Cedro, CaliforniaWed, Dec 16, 3:06 AM PST · 14173 days ago · 4 km deep · 69 km away
19. 2.918 km NNE of Upper Lake, CaliforniaWed, Dec 16, 5:02 PM PST · 14172 days ago · 3 km deep · 98 km away
20. 2.341 km WNW of Rancho Tehama Reserve, CaliforniaFri, Dec 18, 10:18 PM PST · 14170 days ago · 4 km deep · 4 km away
21. 2.430 km W of Paskenta, CaliforniaSat, Dec 19, 1:47 AM PST · 14170 days ago · -1 km deep · 33 km away
22. 2.57 km NE of Miranda, CaliforniaSat, Dec 26, 3:30 PM PST · 14162 days ago · 8 km deep · 77 km away
23. 1.814 km W of Montgomery Creek, CaliforniaSat, Dec 26, 4:51 PM PST · 14162 days ago · 14 km deep · 98 km away
24. 2.411 km SSW of Willow Creek, CaliforniaSat, Jan 2, 12:04 PM PST · 14155 days ago · 4 km deep · 97 km away
25. 2.29 km SE of Bend, CaliforniaSun, Jan 3, 5:26 AM PST · 14155 days ago · -1 km deep · 64 km away
26. 2.35 km ENE of Douglas City, CaliforniaSun, Jan 3, 7:27 AM PST · 14154 days ago · 10 km deep · 51 km away
27. 1.55 km WSW of Bella Vista, CaliforniaMon, Jan 4, 10:45 AM PST · 14153 days ago · 2 km deep · 68 km away
28. 1.9Northern CaliforniaTue, Jan 5, 8:02 AM PST · 14152 days ago · 8 km deep · 59 km away
29. 1.95 km ENE of Bella Vista, CaliforniaWed, Jan 6, 9:49 PM PST · 14151 days ago · 4 km deep · 78 km away
30. 2.516 km N of Weaverville, CaliforniaThu, Jan 7, 7:43 AM PST · 14150 days ago · 21 km deep · 75 km away
31. 3.027 km E of Covelo, CaliforniaThu, Jan 7, 8:27 AM PST · 14150 days ago · 4 km deep · 43 km away
32. 1.73 km WNW of Central Valley (historical), CaliforniaSat, Jan 9, 5:33 PM PST · 14148 days ago · -1 km deep · 67 km away
33. 1.713 km ESE of Paynes Creek, CaliforniaFri, Jan 15, 1:58 AM PST · 14143 days ago · 3 km deep · 94 km away
34. 1.74 km NNW of Palo Cedro, CaliforniaTue, Jan 19, 5:58 PM PST · 14138 days ago · 21 km deep · 68 km away
35. 1.57 km SE of Flournoy, CaliforniaSat, Jan 23, 6:55 AM PST · 14134 days ago · 77 km deep · 56 km away
36. 1.73 km NNE of Tehama, CaliforniaSun, Jan 24, 3:17 AM PST · 14134 days ago · 30 km deep · 67 km away
37. 1.63 km ENE of Garberville, CaliforniaMon, Jan 25, 11:42 PM PST · 14132 days ago · 22 km deep · 76 km away

Before

1. 1.613 km SSE of Laytonville, CaliforniaThu, Nov 26, 11:35 PM PST · 14192 days ago · 5 km deep · 82 km away
2. 2.013 km WNW of Covelo, CaliforniaThu, Nov 26, 12:04 PM PST · 14192 days ago · 4 km deep · 61 km away
3. 1.936 km NW of Paskenta, CaliforniaThu, Nov 26, 10:08 AM PST · 14192 days ago · -1 km deep · 10 km away
4. 1.826 km NW of Paskenta, CaliforniaThu, Nov 26, 9:35 AM PST · 14192 days ago · 4 km deep · 19 km away
5. 2.236 km SE of Ruth, CaliforniaThu, Nov 26, 9:15 AM PST · 14192 days ago · -1 km deep · 17 km away
6. 2.536 km NW of Paskenta, CaliforniaThu, Nov 26, 7:48 AM PST · 14192 days ago · 4 km deep · 8 km away
7. 2.812 km S of Laytonville, CaliforniaWed, Nov 25, 7:00 PM PST · 14193 days ago · 0 km deep · 88 km away
8. 2.340 km E of Ruth, CaliforniaTue, Nov 24, 7:05 PM PST · 14194 days ago · 2 km deep · 2 km away
9. 3.040 km ESE of Ruth, CaliforniaSun, Nov 22, 1:32 AM PST · 14197 days ago · -1 km deep · 2 km away
10. 2.240 km ESE of Ruth, CaliforniaSat, Nov 21, 11:28 PM PST · 14197 days ago · 7 km deep · 6 km away
11. 2.518 km NE of Potter Valley, CaliforniaFri, Nov 13, 8:08 AM PST · 14205 days ago · 7 km deep · 87 km away
12. 3.813 km SE of Trinity Center, CaliforniaFri, Nov 13, 2:25 AM PST · 14206 days ago · 4 km deep · 82 km away
13. 2.47 km E of Willits, CaliforniaFri, Nov 13, 12:01 AM PST · 14206 days ago · 1 km deep · 95 km away
14. 2.427 km SSE of Covelo, CaliforniaMon, Nov 9, 1:39 AM PST · 14210 days ago · 4 km deep · 71 km away
15. 2.215 km E of Lakehead, CaliforniaSat, Nov 7, 10:56 PM PST · 14211 days ago · 3 km deep · 96 km away
16. 1.75 km ENE of Nord, CaliforniaSat, Nov 7, 12:50 AM PST · 14212 days ago · 27 km deep · 94 km away
17. 2.42 km NNW of French Gulch, CaliforniaFri, Nov 6, 7:33 AM PST · 14212 days ago · 4 km deep · 61 km away
18. 1.614 km NE of Potter Valley, CaliforniaThu, Nov 5, 7:00 PM PST · 14213 days ago · 4 km deep · 87 km away
19. 1.63 km SW of Palo Cedro, CaliforniaThu, Nov 5, 3:14 PM PST · 14213 days ago · 8 km deep · 64 km away
20. 2.33 km W of Palo Cedro, CaliforniaThu, Nov 5, 3:43 AM PST · 14214 days ago · 18 km deep · 64 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc10085833. Read Mon, Oct 5, 2026, 12:59 AM UTC.