M1.8 earthquake 46 km WNW of Samoa, California

Magnitude

1.8 (md), micro

Local time

Thu, Jul 20, 1978, 10:49 PM PDT

UTC

1978-07-21 05:49:01 UTC

Depth

20.2 km (12.5 mi), shallow

Epicenter

40.943° N, 124.708° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 9.7 km horizontally, 10.7 km in depth

Magnitude uncertainty

±0.06

Depth from

From location

Station coverage gap

317°, poorly surrounded by stations

Stations used

4

• Manila, CaliforniaPopulation 784. Forecast47 kmWNW
• Eureka, CaliforniaPopulation 27,017. Forecast48 kmWNW
• Chico, CaliforniaPopulation 121,345. Forecast278 kmWNW

After

1. 2.075 km WSW of Ferndale, CaliforniaFri, Jul 21, 4:20 AM PDT · 17596 days ago · 4 km deep · 70 km away
2. 1.633 km SSW of Ferndale, CaliforniaFri, Jul 21, 1:40 PM PDT · 17595 days ago · 25 km deep · 73 km away
3. 1.530 km SW of Ferndale, CaliforniaFri, Jul 21, 7:02 PM PDT · 17595 days ago · 21 km deep · 69 km away
4. 1.8near the coast of Northern CaliforniaSat, Jul 22, 7:25 PM PDT · 17594 days ago · 19 km deep · 69 km away
5. 2.936 km SW of Ferndale, CaliforniaSun, Jul 23, 9:11 AM PDT · 17593 days ago · 21 km deep · 72 km away
6. 3.490 km WSW of Crescent City, CaliforniaSun, Jul 23, 6:57 PM PDT · 17593 days ago · 4 km deep · 79 km away
7. 1.631 km WSW of Ferndale, CaliforniaSun, Jul 23, 11:19 PM PDT · 17593 days ago · 27 km deep · 55 km away
8. 1.69 km S of Ferndale, CaliforniaMon, Jul 24, 5:16 AM PDT · 17593 days ago · 18 km deep · 63 km away
9. 2.410 km S of Ferndale, CaliforniaMon, Jul 24, 11:28 AM PDT · 17592 days ago · 19 km deep · 63 km away
10. 2.794 km W of Big Lagoon, CaliforniaMon, Jul 24, 11:34 AM PDT · 17592 days ago · 4 km deep · 54 km away
11. 3.279 km WSW of Ferndale, CaliforniaMon, Jul 24, 2:51 PM PDT · 17592 days ago · 5 km deep · 73 km away
12. 2.596 km WNW of Indianola, CaliforniaTue, Jul 25, 4:11 AM PDT · 17592 days ago · 5 km deep · 55 km away
13. 2.368 km WSW of Ferndale, CaliforniaTue, Jul 25, 6:00 AM PDT · 17591 days ago · 7 km deep · 67 km away
14. 1.528 km W of Indianola, CaliforniaTue, Jul 25, 8:25 AM PDT · 17591 days ago · 22 km deep · 31 km away
15. 2.69 km S of Ferndale, CaliforniaTue, Jul 25, 11:14 AM PDT · 17591 days ago · 19 km deep · 63 km away
16. 1.821 km SW of Ferndale, CaliforniaTue, Jul 25, 9:27 PM PDT · 17591 days ago · 18 km deep · 59 km away
17. 1.622 km SW of Ferndale, CaliforniaTue, Jul 25, 9:29 PM PDT · 17591 days ago · 17 km deep · 58 km away
18. 1.522 km SW of Ferndale, CaliforniaTue, Jul 25, 9:38 PM PDT · 17591 days ago · 17 km deep · 59 km away
19. 2.411 km NNE of Redcrest, CaliforniaWed, Jul 26, 2:47 PM PDT · 17590 days ago · 24 km deep · 84 km away
20. 2.387 km WSW of Ferndale, CaliforniaWed, Jul 26, 9:37 PM PDT · 17590 days ago · 4 km deep · 76 km away
21. 2.129 km WNW of Ferndale, CaliforniaThu, Jul 27, 10:59 AM PDT · 17589 days ago · 22 km deep · 32 km away
22. 1.89 km S of Ferndale, CaliforniaThu, Jul 27, 4:31 PM PDT · 17589 days ago · 18 km deep · 62 km away
23. 1.814 km SSW of Ferndale, CaliforniaFri, Jul 28, 10:35 AM PDT · 17588 days ago · 26 km deep · 63 km away
24. 2.122 km WSW of Weott, CaliforniaSat, Jul 29, 11:55 AM PDT · 17587 days ago · 2 km deep · 89 km away
25. 1.632 km SW of Ferndale, CaliforniaMon, Jul 31, 6:02 AM PDT · 17585 days ago · 31 km deep · 67 km away
26. 2.35 km W of Scotia, CaliforniaMon, Jul 31, 5:24 PM PDT · 17585 days ago · 21 km deep · 69 km away
27. 2.96 km SW of Redcrest, CaliforniaTue, Aug 1, 4:23 PM PDT · 17584 days ago · 26 km deep · 87 km away
28. 3.317 km ESE of Blue Lake, CaliforniaTue, Aug 1, 10:32 PM PDT · 17584 days ago · 32 km deep · 77 km away
29. 1.834 km SW of Ferndale, CaliforniaWed, Aug 2, 4:40 AM PDT · 17584 days ago · 25 km deep · 68 km away
30. 1.92 km NE of Fieldbrook, CaliforniaWed, Aug 2, 11:39 AM PDT · 17583 days ago · 19 km deep · 58 km away
31. 2.778 km W of Ferndale, CaliforniaWed, Aug 2, 5:43 PM PDT · 17583 days ago · 4 km deep · 51 km away
32. 1.622 km WSW of Weott, CaliforniaWed, Aug 2, 9:25 PM PDT · 17583 days ago · 4 km deep · 88 km away
33. 3.135 km SSW of Ferndale, CaliforniaWed, Aug 2, 11:44 PM PDT · 17583 days ago · 26 km deep · 73 km away
34. 1.939 km SW of Ferndale, CaliforniaThu, Aug 3, 12:06 AM PDT · 17583 days ago · 21 km deep · 70 km away
35. 2.539 km SW of Ferndale, CaliforniaThu, Aug 3, 12:52 AM PDT · 17583 days ago · 23 km deep · 73 km away
36. 1.734 km SSW of Ferndale, CaliforniaThu, Aug 3, 2:59 AM PDT · 17583 days ago · 25 km deep · 73 km away
37. 3.583 km WSW of Ferndale, CaliforniaFri, Aug 4, 4:08 AM PDT · 17582 days ago · 32 km deep · 74 km away
38. 2.2near the coast of Northern CaliforniaSat, Aug 5, 9:42 AM PDT · 17580 days ago · 26 km deep · 60 km away
39. 2.943 km SW of Ferndale, CaliforniaSat, Aug 5, 9:13 PM PDT · 17580 days ago · 19 km deep · 71 km away
40. 1.838 km WSW of Ferndale, CaliforniaSat, Aug 5, 9:43 PM PDT · 17580 days ago · 30 km deep · 54 km away
41. 1.79 km S of Ferndale, CaliforniaSun, Aug 6, 6:17 AM PDT · 17579 days ago · 18 km deep · 63 km away
42. 1.58 km SSW of Scotia, CaliforniaMon, Aug 7, 7:03 AM PDT · 17578 days ago · 25 km deep · 75 km away
43. 2.36 km S of Ferndale, CaliforniaMon, Aug 7, 8:56 AM PDT · 17578 days ago · 8 km deep · 61 km away
44. 1.613 km WNW of Willow Creek, CaliforniaMon, Aug 7, 12:45 PM PDT · 17578 days ago · 22 km deep · 78 km away
45. 2.142 km SW of Ferndale, CaliforniaMon, Aug 7, 6:43 PM PDT · 17578 days ago · 19 km deep · 70 km away
46. 1.831 km SSW of Ferndale, CaliforniaMon, Aug 7, 8:32 PM PDT · 17578 days ago · 19 km deep · 71 km away
47. 1.69 km S of Ferndale, CaliforniaTue, Aug 8, 3:31 AM PDT · 17578 days ago · 18 km deep · 62 km away
48. 1.75 km ENE of Redcrest, CaliforniaTue, Aug 8, 5:35 AM PDT · 17578 days ago · 22 km deep · 90 km away
49. 1.523 km NE of Redcrest, CaliforniaTue, Aug 8, 12:57 PM PDT · 17577 days ago · 23 km deep · 91 km away
50. 1.847 km WNW of Indianola, CaliforniaTue, Aug 8, 8:21 PM PDT · 17577 days ago · 7 km deep · 18 km away
51. 2.726 km SSW of Ferndale, CaliforniaWed, Aug 9, 4:46 AM PDT · 17577 days ago · 19 km deep · 68 km away
52. 1.610 km S of Ferndale, CaliforniaFri, Aug 11, 1:35 AM PDT · 17575 days ago · 18 km deep · 62 km away
53. 1.775 km WSW of Ferndale, CaliforniaFri, Aug 11, 8:28 AM PDT · 17574 days ago · 4 km deep · 68 km away
54. 1.832 km SW of Ferndale, CaliforniaFri, Aug 11, 9:48 AM PDT · 17574 days ago · 28 km deep · 61 km away
55. 1.845 km SW of Ferndale, CaliforniaSat, Aug 12, 3:39 AM PDT · 17574 days ago · 21 km deep · 70 km away
56. 2.823 km SSW of Ferndale, CaliforniaSat, Aug 12, 1:48 PM PDT · 17573 days ago · 30 km deep · 68 km away
57. 2.593 km WSW of Ferndale, CaliforniaSat, Aug 12, 2:03 PM PDT · 17573 days ago · 6 km deep · 81 km away
58. 2.139 km WSW of Ferndale, CaliforniaSun, Aug 13, 9:27 AM PDT · 17572 days ago · 27 km deep · 60 km away
59. 2.922 km SSW of Ferndale, CaliforniaSun, Aug 13, 5:11 PM PDT · 17572 days ago · 29 km deep · 68 km away
60. 1.871 km WSW of Ferndale, CaliforniaSun, Aug 13, 7:14 PM PDT · 17572 days ago · 4 km deep · 68 km away

The first 60 of 173.

Before

1. 1.934 km SSW of Ferndale, CaliforniaThu, Jul 20, 3:10 PM PDT · 17596 days ago · -1 km deep · 75 km away
2. 1.771 km WNW of Samoa, CaliforniaTue, Jul 18, 3:38 AM PDT · 17599 days ago · 3 km deep · 26 km away
3. 1.632 km SW of Ferndale, CaliforniaMon, Jul 17, 7:21 PM PDT · 17599 days ago · 17 km deep · 68 km away
4. 1.818 km SW of Scotia, CaliforniaMon, Jul 17, 3:30 PM PDT · 17599 days ago · 31 km deep · 76 km away
5. 2.99 km WSW of Scotia, CaliforniaMon, Jul 17, 5:04 AM PDT · 17600 days ago · 7 km deep · 68 km away
6. 3.010 km S of Ferndale, CaliforniaMon, Jul 17, 3:41 AM PDT · 17600 days ago · 19 km deep · 63 km away
7. 1.99 km W of Scotia, CaliforniaMon, Jul 17, 3:34 AM PDT · 17600 days ago · 2 km deep · 68 km away
8. 2.99 km WSW of Scotia, CaliforniaMon, Jul 17, 2:53 AM PDT · 17600 days ago · 3 km deep · 68 km away
9. 2.39 km WSW of Scotia, CaliforniaMon, Jul 17, 1:51 AM PDT · 17600 days ago · 3 km deep · 68 km away
10. 1.610 km S of Ferndale, CaliforniaSun, Jul 16, 7:24 PM PDT · 17600 days ago · 18 km deep · 63 km away
11. 1.759 km WSW of Ferndale, CaliforniaSat, Jul 15, 9:31 AM PDT · 17601 days ago · 28 km deep · 69 km away
12. 2.2123 km W of Ferndale, CaliforniaSat, Jul 15, 6:15 AM PDT · 17601 days ago · 4 km deep · 87 km away
13. 1.920 km ENE of Westhaven-Moonstone, CaliforniaSat, Jul 15, 2:54 AM PDT · 17602 days ago · 22 km deep · 72 km away
14. 2.729 km SSW of Ferndale, CaliforniaSat, Jul 15, 1:12 AM PDT · 17602 days ago · 18 km deep · 72 km away
15. 3.128 km SSW of Ferndale, CaliforniaSat, Jul 15, 12:24 AM PDT · 17602 days ago · 18 km deep · 71 km away
16. 1.9near the coast of Northern CaliforniaFri, Jul 14, 5:02 PM PDT · 17602 days ago · 29 km deep · 43 km away
17. 2.022 km SW of Ferndale, CaliforniaFri, Jul 14, 4:26 PM PDT · 17602 days ago · 17 km deep · 58 km away
18. 2.412 km NNE of Redcrest, CAFri, Jul 14, 12:33 AM PDT · 17603 days ago · 22 km deep · 83 km away
19. 2.55 km NW of Big Lagoon, CaliforniaThu, Jul 13, 11:20 AM PDT · 17603 days ago · 28 km deep · 52 km away
20. 1.55 km WNW of Weott, CaliforniaWed, Jul 12, 8:45 AM PDT · 17604 days ago · 4 km deep · 91 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1041149. Read Wed, Sep 23, 2026, 12:27 AM UTC.