M1.9 earthquake 9 km ENE of Brooktrails, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Dec 21, 1978, 8:18 PM PST

UTC

1978-12-22 04:18:36 UTC

Depth

8.9 km (5.5 mi), shallow

Epicenter

39.477° N, 123.288° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 2.4 km horizontally, 2.2 km in depth

Magnitude uncertainty

±0.08

Depth from

From location

Station coverage gap

238°, poorly surrounded by stations

Stations used

6

• Brooktrails, CaliforniaPopulation 3,235. Forecast9 kmENE
• Ukiah, CaliforniaPopulation 15,917. Forecast37 kmN
• Santa Rosa, CaliforniaPopulation 178,127. Forecast125 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast752 kmNW

After

1. 2.519 km NNE of Upper Lake, CaliforniaFri, Dec 22, 2:19 PM PST · 17450 days ago · 7 km deep · 46 km away
2. 1.917 km SW of Hopland, CaliforniaFri, Dec 22, 7:48 PM PST · 17450 days ago · 1 km deep · 68 km away
3. 1.98 km WSW of Cobb, CaliforniaFri, Dec 22, 9:15 PM PST · 17450 days ago · 1 km deep · 85 km away
4. 1.68 km WSW of Cobb, CaliforniaSun, Dec 24, 10:20 PM PST · 17448 days ago · 1 km deep · 85 km away
5. 2.16 km E of Willits, CaliforniaMon, Dec 25, 10:44 AM PST · 17447 days ago · 1 km deep · 6 km away
6. 1.67 km WSW of Cobb, CaliforniaTue, Dec 26, 2:49 PM PST · 17446 days ago · 2 km deep · 86 km away
7. 1.76 km W of Cobb, CaliforniaTue, Dec 26, 5:14 PM PST · 17446 days ago · 1 km deep · 84 km away
8. 2.010 km SSE of Willits, CaliforniaThu, Dec 28, 10:28 PM PST · 17444 days ago · 4 km deep · 17 km away
9. 1.98 km WSW of Cobb, CaliforniaFri, Dec 29, 11:25 AM PST · 17443 days ago · 1 km deep · 85 km away
10. 1.96 km W of Cobb, CaliforniaFri, Dec 29, 12:33 PM PST · 17443 days ago · 3 km deep · 85 km away
11. 2.07 km WSW of Cobb, CaliforniaMon, Jan 1, 8:19 AM PST · 17440 days ago · 1 km deep · 86 km away
12. 1.67 km WSW of Cobb, CaliforniaWed, Jan 3, 3:39 AM PST · 17438 days ago · 3 km deep · 86 km away
13. 1.927 km SE of Covelo, CaliforniaSun, Jan 7, 10:42 PM PST · 17434 days ago · 0 km deep · 25 km away
14. 1.67 km W of Healdsburg, CaliforniaMon, Jan 8, 12:11 AM PST · 17433 days ago · 1 km deep · 99 km away
15. 1.66 km W of Cobb, CaliforniaWed, Jan 10, 12:54 PM PST · 17431 days ago · 4 km deep · 84 km away
16. 1.911 km S of Ruth, CaliforniaFri, Jan 12, 5:33 AM PST · 17429 days ago · 30 km deep · 77 km away
17. 1.87 km W of Cobb, CaliforniaFri, Jan 12, 10:11 PM PST · 17429 days ago · 3 km deep · 84 km away
18. 1.76 km W of Cobb, CaliforniaFri, Jan 12, 11:38 PM PST · 17429 days ago · 4 km deep · 85 km away
19. 2.76 km W of Cobb, CaliforniaThu, Jan 18, 9:54 PM PST · 17423 days ago · 0 km deep · 84 km away
20. 1.76 km W of Cobb, CaliforniaThu, Jan 18, 11:43 PM PST · 17422 days ago · 0 km deep · 84 km away
21. 1.58 km WSW of Cobb, CaliforniaFri, Jan 19, 4:11 AM PST · 17422 days ago · 1 km deep · 85 km away
22. 2.33 km NNW of Redway, CaliforniaMon, Jan 22, 3:45 AM PST · 17419 days ago · 19 km deep · 88 km away
23. 2.33 km NNW of Redway, CaliforniaMon, Jan 22, 3:38 PM PST · 17419 days ago · 18 km deep · 88 km away
24. 1.67 km WSW of Cobb, CaliforniaMon, Jan 22, 9:27 PM PST · 17419 days ago · 2 km deep · 85 km away
25. 1.65 km W of Cobb, CaliforniaTue, Jan 23, 4:34 PM PST · 17418 days ago · 1 km deep · 84 km away
26. 1.87 km W of Cobb, CaliforniaWed, Jan 24, 3:32 AM PST · 17417 days ago · 4 km deep · 85 km away
27. 2.08 km E of Willits, CaliforniaSat, Jan 27, 9:04 AM PST · 17414 days ago · 7 km deep · 9 km away
28. 1.68 km W of Cobb, CaliforniaSun, Jan 28, 12:12 PM PST · 17413 days ago · 1 km deep · 83 km away
29. 2.07 km W of Cobb, CaliforniaMon, Jan 29, 3:02 AM PST · 17412 days ago · 3 km deep · 85 km away
30. 3.08 km E of Willits, CaliforniaMon, Jan 29, 5:27 PM PST · 17412 days ago · 8 km deep · 9 km away
31. 3.110 km SSW of Alderpoint, CaliforniaMon, Jan 29, 5:27 PM PST · 17412 days ago · 9 km deep · 74 km away
32. 2.68 km E of Willits, CaliforniaMon, Jan 29, 5:28 PM PST · 17412 days ago · 9 km deep · 9 km away
33. 2.06 km W of Cobb, CaliforniaMon, Jan 29, 7:14 PM PST · 17412 days ago · 4 km deep · 84 km away
34. 1.67 km W of Cobb, CaliforniaTue, Jan 30, 7:27 AM PST · 17411 days ago · -1 km deep · 84 km away
35. 2.54 km WSW of Cobb, CaliforniaTue, Jan 30, 9:52 PM PST · 17411 days ago · 2 km deep · 87 km away
36. 1.52 km ENE of Clear Lake Riviera, CaliforniaTue, Jan 30, 10:49 PM PST · 17411 days ago · 3 km deep · 77 km away
37. 2.57 km W of Cobb, CaliforniaSat, Feb 3, 11:49 AM PST · 17407 days ago · 4 km deep · 84 km away
38. 2.023 km N of Covelo, CaliforniaTue, Feb 6, 5:17 PM PST · 17404 days ago · 3 km deep · 59 km away
39. 2.012 km NE of Brooktrails, CaliforniaThu, Feb 8, 7:33 AM PST · 17402 days ago · 7 km deep · 6 km away
40. 1.97 km ENE of Hopland, CaliforniaThu, Feb 8, 8:11 AM PST · 17402 days ago · 5 km deep · 59 km away
41. 1.74 km WSW of Cobb, CaliforniaFri, Feb 9, 5:18 PM PST · 17401 days ago · 2 km deep · 87 km away
42. 1.74 km WSW of Cobb, CaliforniaFri, Feb 9, 5:18 PM PST · 17401 days ago · 1 km deep · 87 km away
43. 1.610 km E of Willits, CaliforniaSun, Feb 11, 7:15 AM PST · 17399 days ago · 2 km deep · 9 km away
44. 2.923 km NE of Willits, CaliforniaMon, Feb 12, 9:04 AM PST · 17398 days ago · 5 km deep · 14 km away
45. 2.46 km W of Cobb, CaliforniaThu, Feb 15, 1:50 AM PST · 17395 days ago · 0 km deep · 85 km away
46. 1.910 km NE of Willits, CaliforniaThu, Feb 15, 4:12 AM PST · 17395 days ago · 3 km deep · 2 km away
47. 2.58 km WSW of Cobb, CaliforniaFri, Feb 16, 9:39 AM PST · 17394 days ago · 2 km deep · 85 km away
48. 2.17 km W of Cobb, CaliforniaSat, Feb 17, 7:37 AM PST · 17393 days ago · 1 km deep · 85 km away
49. 1.77 km WSW of Cobb, CaliforniaMon, Feb 19, 12:43 AM PST · 17391 days ago · 2 km deep · 86 km away

Before

1. 2.03 km N of Redway, CaliforniaWed, Dec 20, 5:57 PM PST · 17452 days ago · 17 km deep · 88 km away
2. 1.6Northern CaliforniaWed, Dec 20, 12:56 PM PST · 17452 days ago · 18 km deep · 89 km away
3. 1.67 km WSW of Cobb, CaliforniaTue, Dec 19, 7:52 AM PST · 17453 days ago · 1 km deep · 85 km away
4. 1.75 km W of Cobb, CaliforniaMon, Dec 18, 5:45 PM PST · 17454 days ago · 0 km deep · 84 km away
5. 2.33 km SE of Calpella, CaliforniaMon, Dec 18, 1:21 AM PST · 17454 days ago · 6 km deep · 31 km away
6. 1.611 km ESE of Willits, CaliforniaFri, Dec 15, 8:28 AM PST · 17457 days ago · 4 km deep · 13 km away
7. 1.56 km W of Cobb, CaliforniaThu, Dec 14, 10:07 PM PST · 17458 days ago · 3 km deep · 84 km away
8. 3.26 km W of Cobb, CaliforniaThu, Dec 14, 7:01 PM PST · 17458 days ago · 4 km deep · 85 km away
9. 1.810 km SE of Hopland, CaliforniaTue, Dec 12, 6:55 PM PST · 17460 days ago · 2 km deep · 66 km away
10. 1.77 km W of Cobb, CaliforniaSat, Dec 9, 9:58 PM PST · 17463 days ago · -1 km deep · 83 km away
11. 3.46 km WSW of Cobb, CaliforniaSat, Dec 9, 8:02 AM PST · 17463 days ago · 0 km deep · 86 km away
12. 1.96 km W of Cobb, CaliforniaFri, Dec 8, 9:58 PM PST · 17464 days ago · 0 km deep · 84 km away
13. 1.811 km ESE of Willits, CaliforniaFri, Dec 8, 11:45 AM PST · 17464 days ago · 4 km deep · 13 km away
14. 1.56 km W of Cobb, CaliforniaThu, Dec 7, 10:09 PM PST · 17465 days ago · 3 km deep · 84 km away
15. 2.39 km WSW of Cobb, CaliforniaTue, Dec 5, 9:25 AM PST · 17467 days ago · 1 km deep · 85 km away
16. 1.69 km W of Cobb, CaliforniaMon, Dec 4, 10:00 PM PST · 17468 days ago · 0 km deep · 84 km away
17. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 9:39 PM PST · 17468 days ago · 3 km deep · 84 km away
18. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 8:39 PM PST · 17468 days ago · 3 km deep · 84 km away
19. 1.76 km WSW of Cobb, CaliforniaMon, Dec 4, 12:27 PM PST · 17468 days ago · 0 km deep · 85 km away
20. 2.211 km SSW of Ruth, CaliforniaMon, Dec 4, 7:23 AM PST · 17468 days ago · 30 km deep · 78 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1043834. Read Thu, Oct 1, 2026, 7:07 PM UTC.