M1.6 earthquake 11 km ESE of Willits, California

Magnitude

1.6 (md), micro

Local time

Fri, Dec 15, 1978, 8:28 AM PST

UTC

1978-12-15 16:28:44 UTC

Depth

3.8 km (2.4 mi), shallow

Epicenter

39.367° N, 123.239° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.0 km horizontally, 6.4 km in depth

Magnitude uncertainty

±0.18

Depth from

From location

Station coverage gap

127°

Stations used

7

• Willits, CaliforniaPopulation 4,861. Forecast11 kmESE
• Ukiah, CaliforniaPopulation 15,917. Forecast24 kmN
• Santa Rosa, CaliforniaPopulation 178,127. Forecast112 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast740 kmNW

After

1. 2.33 km SE of Calpella, CaliforniaMon, Dec 18, 1:21 AM PST · 17445 days ago · 6 km deep · 18 km away
2. 1.75 km W of Cobb, CaliforniaMon, Dec 18, 5:45 PM PST · 17445 days ago · 0 km deep · 71 km away
3. 1.67 km WSW of Cobb, CaliforniaTue, Dec 19, 7:52 AM PST · 17444 days ago · 1 km deep · 72 km away
4. 2.411 km ESE of Hidden Valley Lake, CaliforniaTue, Dec 19, 11:42 PM PST · 17443 days ago · 10 km deep · 96 km away
5. 1.99 km ENE of Brooktrails, CaliforniaThu, Dec 21, 8:18 PM PST · 17442 days ago · 9 km deep · 13 km away
6. 2.519 km NNE of Upper Lake, CaliforniaFri, Dec 22, 2:19 PM PST · 17441 days ago · 7 km deep · 39 km away
7. 1.917 km SW of Hopland, CaliforniaFri, Dec 22, 7:48 PM PST · 17441 days ago · 1 km deep · 55 km away
8. 1.98 km WSW of Cobb, CaliforniaFri, Dec 22, 9:15 PM PST · 17441 days ago · 1 km deep · 72 km away
9. 1.610 km ESE of Hidden Valley Lake, CaliforniaSun, Dec 24, 3:18 PM PST · 17439 days ago · 6 km deep · 95 km away
10. 1.68 km WSW of Cobb, CaliforniaSun, Dec 24, 10:20 PM PST · 17438 days ago · 1 km deep · 72 km away
11. 2.16 km E of Willits, CaliforniaMon, Dec 25, 10:44 AM PST · 17438 days ago · 1 km deep · 7 km away
12. 1.67 km WSW of Cobb, CaliforniaTue, Dec 26, 2:49 PM PST · 17437 days ago · 2 km deep · 73 km away
13. 1.76 km W of Cobb, CaliforniaTue, Dec 26, 5:14 PM PST · 17437 days ago · 1 km deep · 71 km away
14. 2.010 km SSE of Willits, CaliforniaThu, Dec 28, 10:28 PM PST · 17434 days ago · 4 km deep · 7 km away
15. 1.98 km WSW of Cobb, CaliforniaFri, Dec 29, 11:25 AM PST · 17434 days ago · 1 km deep · 72 km away
16. 1.96 km W of Cobb, CaliforniaFri, Dec 29, 12:33 PM PST · 17434 days ago · 3 km deep · 72 km away
17. 2.07 km WSW of Cobb, CaliforniaMon, Jan 1, 8:19 AM PST · 17431 days ago · 1 km deep · 73 km away
18. 1.67 km WSW of Cobb, CaliforniaWed, Jan 3, 3:39 AM PST · 17429 days ago · 3 km deep · 74 km away
19. 1.927 km SE of Covelo, CaliforniaSun, Jan 7, 10:42 PM PST · 17424 days ago · 0 km deep · 31 km away
20. 1.67 km W of Healdsburg, CaliforniaMon, Jan 8, 12:11 AM PST · 17424 days ago · 1 km deep · 86 km away
21. 1.66 km W of Cobb, CaliforniaWed, Jan 10, 12:54 PM PST · 17422 days ago · 4 km deep · 72 km away
22. 1.911 km S of Ruth, CaliforniaFri, Jan 12, 5:33 AM PST · 17420 days ago · 30 km deep · 89 km away
23. 1.87 km W of Cobb, CaliforniaFri, Jan 12, 10:11 PM PST · 17419 days ago · 3 km deep · 71 km away
24. 1.76 km W of Cobb, CaliforniaFri, Jan 12, 11:38 PM PST · 17419 days ago · 4 km deep · 72 km away
25. 2.76 km W of Cobb, CaliforniaThu, Jan 18, 9:54 PM PST · 17413 days ago · 0 km deep · 72 km away
26. 1.76 km W of Cobb, CaliforniaThu, Jan 18, 11:43 PM PST · 17413 days ago · 0 km deep · 72 km away
27. 1.58 km WSW of Cobb, CaliforniaFri, Jan 19, 4:11 AM PST · 17413 days ago · 1 km deep · 72 km away
28. 2.99 km WNW of Princeton, CaliforniaSun, Jan 21, 12:28 PM PST · 17411 days ago · 15 km deep · 96 km away
29. 1.67 km WSW of Cobb, CaliforniaMon, Jan 22, 9:27 PM PST · 17410 days ago · 2 km deep · 73 km away
30. 1.65 km W of Cobb, CaliforniaTue, Jan 23, 4:34 PM PST · 17409 days ago · 1 km deep · 71 km away
31. 1.87 km W of Cobb, CaliforniaWed, Jan 24, 3:32 AM PST · 17408 days ago · 4 km deep · 72 km away
32. 2.08 km E of Willits, CaliforniaSat, Jan 27, 9:04 AM PST · 17405 days ago · 7 km deep · 4 km away
33. 1.68 km W of Cobb, CaliforniaSun, Jan 28, 12:12 PM PST · 17404 days ago · 1 km deep · 70 km away
34. 2.07 km W of Cobb, CaliforniaMon, Jan 29, 3:02 AM PST · 17403 days ago · 3 km deep · 72 km away
35. 3.08 km E of Willits, CaliforniaMon, Jan 29, 5:27 PM PST · 17403 days ago · 8 km deep · 4 km away
36. 3.110 km SSW of Alderpoint, CaliforniaMon, Jan 29, 5:27 PM PST · 17403 days ago · 9 km deep · 87 km away
37. 2.68 km E of Willits, CaliforniaMon, Jan 29, 5:28 PM PST · 17403 days ago · 9 km deep · 4 km away
38. 2.06 km W of Cobb, CaliforniaMon, Jan 29, 7:14 PM PST · 17403 days ago · 4 km deep · 72 km away
39. 1.95 km ESE of Healdsburg, CaliforniaMon, Jan 29, 9:52 PM PST · 17402 days ago · 6 km deep · 93 km away
40. 1.67 km W of Cobb, CaliforniaTue, Jan 30, 7:27 AM PST · 17402 days ago · -1 km deep · 72 km away
41. 2.54 km WSW of Cobb, CaliforniaTue, Jan 30, 9:52 PM PST · 17401 days ago · 2 km deep · 74 km away
42. 1.52 km ENE of Clear Lake Riviera, CaliforniaTue, Jan 30, 10:49 PM PST · 17401 days ago · 3 km deep · 65 km away
43. 2.57 km W of Cobb, CaliforniaSat, Feb 3, 11:49 AM PST · 17398 days ago · 4 km deep · 71 km away
44. 2.78 km WNW of Princeton, CaliforniaTue, Feb 6, 12:28 AM PST · 17395 days ago · 16 km deep · 98 km away
45. 2.023 km N of Covelo, CaliforniaTue, Feb 6, 5:17 PM PST · 17395 days ago · 3 km deep · 71 km away
46. 2.012 km NE of Brooktrails, CaliforniaThu, Feb 8, 7:33 AM PST · 17393 days ago · 7 km deep · 19 km away
47. 1.97 km ENE of Hopland, CaliforniaThu, Feb 8, 8:11 AM PST · 17393 days ago · 5 km deep · 46 km away
48. 1.74 km WSW of Cobb, CaliforniaFri, Feb 9, 5:18 PM PST · 17392 days ago · 2 km deep · 75 km away
49. 1.74 km WSW of Cobb, CaliforniaFri, Feb 9, 5:18 PM PST · 17392 days ago · 1 km deep · 75 km away
50. 1.610 km E of Willits, CaliforniaSun, Feb 11, 7:15 AM PST · 17390 days ago · 2 km deep · 4 km away
51. 2.923 km NE of Willits, CaliforniaMon, Feb 12, 9:04 AM PST · 17389 days ago · 5 km deep · 21 km away
52. 1.77 km ENE of Healdsburg, CaliforniaTue, Feb 13, 6:19 AM PST · 17388 days ago · 6 km deep · 90 km away

Before

1. 1.56 km W of Cobb, CaliforniaThu, Dec 14, 10:07 PM PST · 17448 days ago · 3 km deep · 71 km away
2. 3.26 km W of Cobb, CaliforniaThu, Dec 14, 7:01 PM PST · 17449 days ago · 4 km deep · 72 km away
3. 1.912 km ESE of Hidden Valley Lake, CaliforniaWed, Dec 13, 10:06 AM PST · 17450 days ago · 8 km deep · 97 km away
4. 1.810 km SE of Hopland, CaliforniaTue, Dec 12, 6:55 PM PST · 17451 days ago · 2 km deep · 53 km away
5. 1.77 km W of Cobb, CaliforniaSat, Dec 9, 9:58 PM PST · 17453 days ago · -1 km deep · 71 km away
6. 2.0Northern CaliforniaSat, Dec 9, 9:56 PM PST · 17453 days ago · 8 km deep · 97 km away
7. 1.7Northern CaliforniaSat, Dec 9, 8:07 AM PST · 17454 days ago · 18 km deep · 91 km away
8. 3.46 km WSW of Cobb, CaliforniaSat, Dec 9, 8:02 AM PST · 17454 days ago · 0 km deep · 73 km away
9. 1.96 km W of Cobb, CaliforniaFri, Dec 8, 9:58 PM PST · 17454 days ago · 0 km deep · 71 km away
10. 1.811 km ESE of Willits, CaliforniaFri, Dec 8, 11:45 AM PST · 17455 days ago · 4 km deep · 0 km away
11. 1.512 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:54 AM PST · 17455 days ago · 8 km deep · 97 km away
12. 2.112 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:51 AM PST · 17455 days ago · 8 km deep · 97 km away
13. 1.56 km W of Cobb, CaliforniaThu, Dec 7, 10:09 PM PST · 17455 days ago · 3 km deep · 71 km away
14. 2.39 km WSW of Cobb, CaliforniaTue, Dec 5, 9:25 AM PST · 17458 days ago · 1 km deep · 72 km away
15. 1.69 km W of Cobb, CaliforniaMon, Dec 4, 10:00 PM PST · 17458 days ago · 0 km deep · 71 km away
16. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 9:39 PM PST · 17459 days ago · 3 km deep · 72 km away
17. 2.57 km W of Cobb, CaliforniaMon, Dec 4, 8:39 PM PST · 17459 days ago · 3 km deep · 71 km away
18. 1.76 km WSW of Cobb, CaliforniaMon, Dec 4, 12:27 PM PST · 17459 days ago · 0 km deep · 73 km away
19. 2.211 km SSW of Ruth, CaliforniaMon, Dec 4, 7:23 AM PST · 17459 days ago · 30 km deep · 90 km away
20. 1.74 km WNW of Redwood Valley, CaliforniaSun, Dec 3, 2:12 AM PST · 17460 days ago · 7 km deep · 10 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1043754. Read Tue, Sep 22, 2026, 5:14 PM UTC.