M1.9 earthquake 5 km WSW of Cobb, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Apr 4, 1979, 10:16 AM PST

UTC

1979-04-04 18:16:28 UTC

Depth

0.1 km (0.1 mi), shallow

Epicenter

38.804° N, 122.787° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.2 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

64°

Stations used

18

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast41 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast666 kmNW

After

1. 1.55 km WSW of Cobb, CaliforniaWed, Apr 4, 11:24 AM PST · 17349 days ago · 0 km deep · 0 km away
2. 2.46 km ENE of Vallejo, CaliforniaMon, Apr 9, 3:59 PM PST · 17344 days ago · 0 km deep · 92 km away
3. 1.66 km WSW of Cobb, CaliforniaThu, Apr 12, 5:53 PM PST · 17341 days ago · 0 km deep · 1 km away
4. 2.68 km WSW of Cobb, CaliforniaSun, Apr 15, 5:02 AM PST · 17338 days ago · 4 km deep · 2 km away
5. 1.58 km WSW of Cobb, CaliforniaSun, Apr 15, 1:25 PM PST · 17338 days ago · 4 km deep · 2 km away
6. 1.95 km ESE of Clearlake Oaks, CaliforniaSun, Apr 15, 3:10 PM PST · 17338 days ago · 2 km deep · 28 km away
7. 2.06 km WSW of Cobb, CaliforniaSun, Apr 15, 11:30 PM PST · 17338 days ago · 4 km deep · 1 km away
8. 1.710 km NW of Moskowite Corner, CaliforniaMon, Apr 16, 5:06 AM PST · 17337 days ago · 5 km deep · 55 km away
9. 1.84 km ENE of Saint Helena, CaliforniaMon, Apr 16, 6:15 AM PST · 17337 days ago · 10 km deep · 45 km away
10. 2.57 km WSW of Cobb, CaliforniaThu, Apr 19, 7:34 AM PST · 17334 days ago · 3 km deep · 2 km away
11. 1.910 km NNW of Potter Valley, CaliforniaSat, Apr 21, 1:59 PM PST · 17332 days ago · 4 km deep · 75 km away
12. 1.610 km SE of Boonville, CaliforniaTue, Apr 24, 7:45 AM PST · 17329 days ago · 1 km deep · 47 km away
13. 2.16 km WSW of Calistoga, CaliforniaWed, Apr 25, 8:14 PM PST · 17328 days ago · 5 km deep · 30 km away
14. 2.10 km N of Hopland, CaliforniaFri, Apr 27, 12:25 AM PST · 17327 days ago · 7 km deep · 35 km away
15. 2.46 km W of Cobb, CaliforniaSat, Apr 28, 5:16 PM PST · 17325 days ago · 1 km deep · 3 km away
16. 1.99 km W of Cobb, CaliforniaTue, May 1, 4:26 AM PDT · 17322 days ago · 1 km deep · 4 km away
17. 2.411 km E of Comptche, CaliforniaTue, May 1, 2:53 PM PDT · 17322 days ago · 13 km deep · 78 km away
18. 1.714 km NNW of Potter Valley, CaliforniaTue, May 1, 11:34 PM PDT · 17322 days ago · 4 km deep · 79 km away
19. 3.06 km W of Cobb, CaliforniaWed, May 2, 1:50 AM PDT · 17322 days ago · 1 km deep · 3 km away
20. 1.56 km WSW of Cobb, CaliforniaSat, May 5, 1:02 PM PDT · 17318 days ago · 1 km deep · 1 km away
21. 1.94 km WSW of Guinda, CaliforniaSun, May 6, 11:02 AM PDT · 17317 days ago · 43 km deep · 48 km away
22. 1.610 km E of Hidden Valley Lake, CaliforniaWed, May 9, 8:27 AM PDT · 17314 days ago · 10 km deep · 30 km away
23. 1.64 km WSW of Cobb, CaliforniaFri, May 11, 2:25 PM PDT · 17312 days ago · 1 km deep · 1 km away
24. 1.65 km WSW of Cobb, CaliforniaFri, May 11, 4:16 PM PDT · 17312 days ago · 0 km deep · 0 km away
25. 2.22 km NNE of Deer Park, CaliforniaFri, May 11, 7:45 PM PDT · 17312 days ago · 11 km deep · 40 km away
26. 2.33 km WSW of Cobb, CaliforniaSun, May 13, 7:11 AM PDT · 17310 days ago · 2 km deep · 2 km away
27. 1.87 km W of Cobb, CaliforniaTue, May 15, 6:39 PM PDT · 17308 days ago · 1 km deep · 2 km away
28. 2.27 km W of Cobb, CaliforniaThu, May 17, 2:32 AM PDT · 17306 days ago · 3 km deep · 2 km away
29. 2.28 km WSW of Cobb, CaliforniaSat, May 19, 4:08 PM PDT · 17304 days ago · 1 km deep · 2 km away
30. 2.913 km NW of Moskowite Corner, CaliforniaSun, May 20, 4:35 AM PDT · 17303 days ago · 11 km deep · 52 km away
31. 2.35 km SSW of Calistoga, CaliforniaSun, May 20, 4:44 AM PDT · 17303 days ago · 3 km deep · 34 km away
32. 2.13 km SSW of Green Valley, CaliforniaMon, May 21, 5:27 AM PDT · 17302 days ago · 10 km deep · 84 km away
33. 1.78 km W of Cobb, CaliforniaTue, May 22, 1:25 AM PDT · 17302 days ago · 0 km deep · 3 km away
34. 1.58 km WNW of Hopland, CaliforniaThu, May 24, 1:39 AM PDT · 17300 days ago · 2 km deep · 42 km away
35. 1.89 km W of Cobb, CaliforniaFri, May 25, 5:50 AM PDT · 17298 days ago · 0 km deep · 4 km away
36. 1.923 km ENE of Potter Valley, CaliforniaFri, May 25, 9:29 AM PDT · 17298 days ago · 9 km deep · 67 km away
37. 1.86 km WNW of Cloverdale, CaliforniaSun, May 27, 2:27 AM PDT · 17297 days ago · 42 km deep · 26 km away
38. 2.74 km WSW of Cobb, CaliforniaSun, May 27, 7:37 PM PDT · 17296 days ago · 1 km deep · 2 km away
39. 2.77 km WSW of Cobb, CaliforniaSun, May 27, 10:28 PM PDT · 17296 days ago · 1 km deep · 2 km away
40. 2.29 km NNW of Moskowite Corner, CaliforniaTue, May 29, 12:32 AM PDT · 17295 days ago · 16 km deep · 57 km away
41. 1.67 km WSW of Cobb, CaliforniaWed, May 30, 4:34 AM PDT · 17293 days ago · 2 km deep · 2 km away
42. 1.93 km ESE of Kenwood, CaliforniaThu, May 31, 3:09 PM PDT · 17292 days ago · 9 km deep · 51 km away
43. 2.36 km S of Clear Lake Riviera, CaliforniaFri, Jun 1, 3:41 AM PDT · 17291 days ago · 2 km deep · 11 km away
44. 1.74 km NE of Larkfield-Wikiup, CaliforniaFri, Jun 1, 5:28 AM PDT · 17291 days ago · 3 km deep · 30 km away
45. 1.84 km NNE of Larkfield-Wikiup, CaliforniaFri, Jun 1, 6:14 AM PDT · 17291 days ago · 3 km deep · 28 km away
46. 1.67 km W of Cobb, CaliforniaFri, Jun 1, 8:15 AM PDT · 17291 days ago · 3 km deep · 2 km away
47. 1.75 km WSW of Cobb, CaliforniaSat, Jun 2, 7:59 PM PDT · 17290 days ago · 0 km deep · 0 km away

Before

1. 2.03 km ESE of Talmage, CaliforniaTue, Apr 3, 8:41 PM PST · 17350 days ago · 3 km deep · 46 km away
2. 1.64 km SSE of Hopland, CaliforniaTue, Apr 3, 3:18 PM PST · 17350 days ago · 7 km deep · 31 km away
3. 1.912 km NNW of Potter Valley, CaliforniaTue, Apr 3, 9:40 AM PST · 17350 days ago · 12 km deep · 77 km away
4. 1.710 km NNW of Potter Valley, CaliforniaTue, Apr 3, 9:26 AM PST · 17350 days ago · 4 km deep · 75 km away
5. 1.65 km SSW of Woodland, CaliforniaTue, Apr 3, 2:30 AM PST · 17350 days ago · 6 km deep · 87 km away
6. 1.53 km ESE of Calpella, CaliforniaMon, Apr 2, 1:19 PM PST · 17351 days ago · 6 km deep · 57 km away
7. 2.17 km SSE of Potter Valley, CaliforniaMon, Apr 2, 1:18 PM PST · 17351 days ago · 41 km deep · 57 km away
8. 2.13 km ESE of Calpella, CaliforniaMon, Apr 2, 1:18 PM PST · 17351 days ago · 6 km deep · 57 km away
9. 1.75 km NE of Nice, CaliforniaSun, Apr 1, 11:43 PM PST · 17352 days ago · 9 km deep · 40 km away
10. 1.53 km ESE of Calpella, CaliforniaSun, Apr 1, 8:00 PM PST · 17352 days ago · 5 km deep · 56 km away
11. 1.65 km ENE of Lucerne, CaliforniaFri, Mar 30, 6:38 AM PST · 17354 days ago · 8 km deep · 34 km away
12. 1.69 km E of Willits, CaliforniaThu, Mar 29, 3:23 AM PST · 17355 days ago · 4 km deep · 77 km away
13. 1.58 km WSW of Cobb, CaliforniaThu, Mar 29, 12:09 AM PST · 17356 days ago · 4 km deep · 2 km away
14. 1.70 km NNE of Larkfield-Wikiup, CaliforniaWed, Mar 28, 10:28 PM PST · 17356 days ago · 4 km deep · 32 km away
15. 1.86 km ENE of Brooktrails, CaliforniaMon, Mar 26, 1:54 PM PST · 17358 days ago · 4 km deep · 86 km away
16. 2.319 km NE of Upper Lake, CaliforniaSun, Mar 25, 10:40 AM PST · 17359 days ago · 8 km deep · 56 km away
17. 1.88 km NNE of Hopland, CaliforniaSun, Mar 25, 4:54 AM PST · 17359 days ago · 0 km deep · 38 km away
18. 1.98 km NNE of Hopland, CaliforniaSun, Mar 25, 4:50 AM PST · 17359 days ago · 2 km deep · 37 km away
19. 1.85 km SE of Santa Rosa, CaliforniaSat, Mar 24, 11:27 PM PST · 17360 days ago · 10 km deep · 45 km away
20. 2.16 km W of Cobb, CaliforniaSat, Mar 24, 6:54 PM PST · 17360 days ago · 4 km deep · 2 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1045262. Read Sat, Oct 3, 2026, 8:59 PM UTC.