M1.7 earthquake 6 km SW of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, May 9, 1984, 11:40 AM PDT

UTC

1984-05-09 18:40:51 UTC

Depth

-0.5 km (-0.3 mi), shallow

Epicenter

38.785° N, 122.774° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.8 km in depth

Magnitude uncertainty

±0.22

Depth from

From location

Station coverage gap

102°

Stations used

11

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast664 kmNW

After

1. 1.87 km W of Cobb, CaliforniaWed, May 9, 5:23 PM PDT · 15487 days ago · 3 km deep · 4 km away
2. 1.56 km W of Cobb, CaliforniaThu, May 10, 3:42 AM PDT · 15487 days ago · 2 km deep · 5 km away
3. 1.59 km W of Cobb, CaliforniaThu, May 10, 10:03 PM PDT · 15486 days ago · 2 km deep · 6 km away
4. 1.88 km SE of Willits, CaliforniaThu, May 10, 10:39 PM PDT · 15486 days ago · 4 km deep · 77 km away
5. 1.77 km WSW of Cobb, CaliforniaSat, May 12, 12:09 AM PDT · 15485 days ago · 3 km deep · 3 km away
6. 2.25 km ESE of Manchester, CaliforniaSat, May 12, 3:30 PM PDT · 15484 days ago · 0 km deep · 77 km away
7. 1.86 km W of Cobb, CaliforniaSun, May 13, 7:04 AM PDT · 15484 days ago · 3 km deep · 4 km away
8. 1.73 km N of Clearlake, CaliforniaSun, May 13, 7:38 AM PDT · 15484 days ago · 0 km deep · 26 km away
9. 1.620 km NNE of Upper Lake, CaliforniaSun, May 13, 10:48 AM PDT · 15484 days ago · 6 km deep · 62 km away
10. 1.66 km WSW of Cobb, CaliforniaMon, May 14, 10:50 AM PDT · 15483 days ago · 3 km deep · 3 km away
11. 1.75 km WSW of Rutherford, CaliforniaTue, May 15, 5:05 AM PDT · 15482 days ago · 0 km deep · 46 km away
12. 1.77 km WSW of Cobb, CaliforniaTue, May 15, 12:15 PM PDT · 15481 days ago · 3 km deep · 3 km away
13. 1.816 km ENE of Potter Valley, CaliforniaTue, May 15, 6:36 PM PDT · 15481 days ago · 6 km deep · 69 km away
14. 2.34 km SW of Cobb, CaliforniaWed, May 16, 5:35 AM PDT · 15481 days ago · 0 km deep · 2 km away
15. 1.67 km W of Cobb, CaliforniaWed, May 16, 8:08 AM PDT · 15481 days ago · 3 km deep · 4 km away
16. 1.96 km W of Cobb, CaliforniaThu, May 17, 12:30 AM PDT · 15480 days ago · 2 km deep · 4 km away
17. 1.66 km W of Cobb, CaliforniaThu, May 17, 12:31 AM PDT · 15480 days ago · 3 km deep · 5 km away
18. 1.67 km WSW of Cobb, CaliforniaThu, May 17, 5:43 PM PDT · 15479 days ago · 2 km deep · 4 km away
19. 1.96 km W of Cobb, CaliforniaThu, May 17, 7:40 PM PDT · 15479 days ago · 3 km deep · 4 km away
20. 2.37 km WSW of Cobb, CaliforniaThu, May 17, 8:10 PM PDT · 15479 days ago · 0 km deep · 3 km away
21. 1.93 km SE of Calpella, CaliforniaFri, May 18, 1:59 AM PDT · 15479 days ago · 5 km deep · 59 km away
22. 1.67 km E of Hidden Valley Lake, CaliforniaFri, May 18, 10:32 AM PDT · 15479 days ago · 7 km deep · 27 km away
23. 1.77 km WSW of Cobb, CaliforniaFri, May 18, 11:44 AM PDT · 15479 days ago · 0 km deep · 3 km away
24. 1.8Northern CaliforniaFri, May 18, 10:03 PM PDT · 15478 days ago · 4 km deep · 22 km away
25. 3.05 km SW of Cobb, CaliforniaSat, May 19, 12:08 AM PDT · 15478 days ago · 0 km deep · 1 km away
26. 1.96 km W of Cobb, CaliforniaSat, May 19, 2:36 AM PDT · 15478 days ago · 3 km deep · 4 km away
27. 1.525 km SE of Covelo, CaliforniaSat, May 19, 2:39 PM PDT · 15477 days ago · 4 km deep · 96 km away
28. 1.6Northern CaliforniaSun, May 20, 5:22 PM PDT · 15476 days ago · 0 km deep · 31 km away
29. 1.87 km S of Calistoga, CaliforniaSun, May 20, 6:46 PM PDT · 15476 days ago · 1 km deep · 35 km away
30. 2.56 km W of Cobb, CaliforniaMon, May 21, 4:00 AM PDT · 15476 days ago · 2 km deep · 4 km away
31. 2.16 km W of Cobb, CaliforniaMon, May 21, 4:00 AM PDT · 15476 days ago · 2 km deep · 4 km away
32. 1.67 km WSW of Cobb, CaliforniaMon, May 21, 10:35 AM PDT · 15476 days ago · 4 km deep · 3 km away
33. 1.57 km WSW of Cobb, CaliforniaMon, May 21, 12:35 PM PDT · 15475 days ago · 3 km deep · 3 km away
34. 1.75 km ESE of Healdsburg, CaliforniaMon, May 21, 1:17 PM PDT · 15475 days ago · 4 km deep · 21 km away
35. 2.47 km WSW of Cobb, CaliforniaMon, May 21, 7:12 PM PDT · 15475 days ago · 1 km deep · 3 km away
36. 1.712 km S of Comptche, CaliforniaTue, May 22, 4:32 AM PDT · 15475 days ago · 3 km deep · 83 km away
37. 2.112 km S of Comptche, CaliforniaTue, May 22, 5:38 AM PDT · 15475 days ago · 0 km deep · 82 km away
38. 1.55 km N of Windsor, CaliforniaTue, May 22, 2:47 PM PDT · 15474 days ago · 7 km deep · 21 km away
39. 2.47 km WSW of Cobb, CaliforniaTue, May 22, 8:15 PM PDT · 15474 days ago · -1 km deep · 3 km away
40. 2.37 km W of Cobb, CaliforniaWed, May 23, 8:28 AM PDT · 15474 days ago · 2 km deep · 4 km away
41. 2.07 km W of Cobb, CaliforniaWed, May 23, 9:43 PM PDT · 15473 days ago · 1 km deep · 5 km away
42. 1.56 km WSW of Cobb, CaliforniaThu, May 24, 4:21 AM PDT · 15473 days ago · 1 km deep · 3 km away
43. 1.8Northern CaliforniaThu, May 24, 6:35 AM PDT · 15473 days ago · 3 km deep · 4 km away
44. 1.98 km WSW of Cobb, CaliforniaThu, May 24, 8:41 AM PDT · 15473 days ago · 3 km deep · 4 km away
45. 2.38 km WSW of Cobb, CaliforniaThu, May 24, 8:42 AM PDT · 15473 days ago · 2 km deep · 4 km away
46. 1.77 km W of Cobb, CaliforniaThu, May 24, 10:12 AM PDT · 15473 days ago · 3 km deep · 4 km away
47. 1.610 km N of Comptche, CaliforniaFri, May 25, 9:48 AM PDT · 15472 days ago · 5 km deep · 95 km away
48. 1.66 km NE of Lower Lake, CaliforniaFri, May 25, 10:43 AM PDT · 15472 days ago · 1 km deep · 26 km away
49. 1.67 km SSW of Willits, CaliforniaFri, May 25, 4:48 PM PDT · 15471 days ago · 1 km deep · 82 km away
50. 2.621 km NE of Potter Valley, CaliforniaFri, May 25, 10:00 PM PDT · 15471 days ago · 5 km deep · 77 km away
51. 1.88 km E of Lower Lake, CaliforniaSat, May 26, 2:41 AM PDT · 15471 days ago · 3 km deep · 27 km away
52. 1.56 km W of Cobb, CaliforniaSat, May 26, 6:58 PM PDT · 15470 days ago · 0 km deep · 5 km away
53. 2.56 km W of Cobb, CaliforniaSat, May 26, 7:00 PM PDT · 15470 days ago · 0 km deep · 5 km away
54. 1.77 km W of Cobb, CaliforniaSat, May 26, 7:00 PM PDT · 15470 days ago · 0 km deep · 6 km away
55. 1.65 km WSW of Cobb, CaliforniaSat, May 26, 8:41 PM PDT · 15470 days ago · 1 km deep · 2 km away
56. 1.616 km ENE of Potter Valley, CaliforniaSat, May 26, 9:05 PM PDT · 15470 days ago · 7 km deep · 70 km away
57. 1.92 km WSW of Cobb, CaliforniaSun, May 27, 12:17 AM PDT · 15470 days ago · -1 km deep · 4 km away
58. 1.73 km SW of Cobb, CaliforniaSun, May 27, 1:10 AM PDT · 15470 days ago · 1 km deep · 2 km away
59. 1.57 km W of Potter Valley, CaliforniaSun, May 27, 2:35 AM PDT · 15470 days ago · 8 km deep · 71 km away
60. 1.76 km W of Cobb, CaliforniaSun, May 27, 1:03 PM PDT · 15469 days ago · 3 km deep · 5 km away

The first 60 of 169.

Before

1. 1.77 km W of Cobb, CaliforniaWed, May 9, 11:27 AM PDT · 15488 days ago · 4 km deep · 5 km away
2. 1.60 km NE of Larkfield-Wikiup, CaliforniaTue, May 8, 6:06 PM PDT · 15488 days ago · 3 km deep · 30 km away
3. 2.25 km SW of Cobb, CaliforniaTue, May 8, 2:50 PM PDT · 15488 days ago · 0 km deep · 1 km away
4. 1.67 km W of Cobb, CaliforniaTue, May 8, 12:05 AM PDT · 15489 days ago · 1 km deep · 5 km away
5. 2.17 km W of Cobb, CaliforniaMon, May 7, 12:50 PM PDT · 15489 days ago · 2 km deep · 4 km away
6. 2.75 km WSW of Vacaville, CaliforniaMon, May 7, 11:20 AM PDT · 15490 days ago · 32 km deep · 81 km away
7. 2.47 km WSW of Cobb, CaliforniaMon, May 7, 9:05 AM PDT · 15490 days ago · 0 km deep · 4 km away
8. 1.56 km W of Potter Valley, CaliforniaMon, May 7, 2:27 AM PDT · 15490 days ago · 8 km deep · 71 km away
9. 2.16 km W of Cobb, CaliforniaSun, May 6, 8:13 PM PDT · 15490 days ago · 3 km deep · 5 km away
10. 1.52 km E of Calpella, CaliforniaSun, May 6, 2:58 PM PDT · 15490 days ago · 4 km deep · 61 km away
11. 2.87 km W of Cobb, CaliforniaSun, May 6, 1:55 PM PDT · 15490 days ago · 3 km deep · 5 km away
12. 1.68 km WSW of Cobb, CaliforniaSun, May 6, 1:45 PM PDT · 15490 days ago · 4 km deep · 4 km away
13. 1.68 km WSW of Cobb, CaliforniaSat, May 5, 12:51 PM PDT · 15491 days ago · 3 km deep · 4 km away
14. 1.67 km WSW of Cobb, CaliforniaFri, May 4, 10:38 PM PDT · 15492 days ago · 3 km deep · 3 km away
15. 1.77 km W of Cobb, CaliforniaThu, May 3, 10:13 PM PDT · 15493 days ago · 3 km deep · 4 km away
16. 1.66 km W of Potter Valley, CaliforniaThu, May 3, 9:18 PM PDT · 15493 days ago · 11 km deep · 70 km away
17. 1.66 km W of Cobb, CaliforniaThu, May 3, 9:04 PM PDT · 15493 days ago · 3 km deep · 5 km away
18. 1.87 km W of Cobb, CaliforniaThu, May 3, 10:59 AM PDT · 15494 days ago · 3 km deep · 5 km away
19. 1.86 km WSW of Cobb, CaliforniaThu, May 3, 10:24 AM PDT · 15494 days ago · 3 km deep · 2 km away
20. 1.76 km ESE of Lucerne, CaliforniaThu, May 3, 7:35 AM PDT · 15494 days ago · 3 km deep · 33 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc18162. Read Sun, Oct 4, 2026, 6:38 AM UTC.