M1.6 earthquake 6km NNE of Grapevine, CA

Magnitude

1.6 (mh), micro

Local time

Fri, Apr 21, 1978, 5:17 PM PST

UTC

1978-04-22 01:17:41 UTC

Depth

18.2 km (11.3 mi), shallow

Epicenter

34.993° N, 118.917° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.2 km horizontally, 1.9 km in depth

Depth from

From location

Station coverage gap

248°, poorly surrounded by stations

Stations used

7

• Lebec, CaliforniaPopulation 1,468. Forecast17 kmNNW
• Arvin, CaliforniaPopulation 20,876. Forecast25 kmSSW
• Bakersfield, CaliforniaPopulation 373,640. Forecast43 kmSSE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast121 kmNNW

After

1. 1.716km S of Arvin, CASun, Apr 23, 3:29 AM PST · 17692 days ago · 0 km deep · 11 km away
2. 2.17km W of Wofford Heights, CAMon, Apr 24, 1:51 PM PST · 17691 days ago · 11 km deep · 87 km away
3. 2.023km ENE of Arvin, CATue, Apr 25, 4:15 AM PST · 17690 days ago · 4 km deep · 45 km away
4. 1.66km NE of Lake View Terrace, CAWed, Apr 26, 4:44 AM PST · 17689 days ago · 11 km deep · 93 km away
5. 2.38km NE of Santa Clarita, CAThu, Apr 27, 12:54 PM PST · 17688 days ago · 13 km deep · 74 km away
6. 2.29km WSW of Bodfish, CAFri, Apr 28, 10:48 AM PST · 17687 days ago · 6 km deep · 69 km away
7. 1.67km ENE of Santa Clarita, CASat, Apr 29, 8:10 AM PST · 17686 days ago · 14 km deep · 75 km away
8. 1.76km SSE of Bakersfield, CASat, Apr 29, 4:05 PM PST · 17686 days ago · 6 km deep · 36 km away
9. 2.711km W of Delano, CAMon, May 1, 4:53 AM PDT · 17684 days ago · 6 km deep · 96 km away
10. 1.518km SSE of Carpinteria, CATue, May 2, 8:17 AM PDT · 17683 days ago · 6 km deep · 97 km away
11. 1.619km SSE of Carpinteria, CAThu, May 4, 3:23 AM PDT · 17681 days ago · 16 km deep · 99 km away
12. 2.223km SW of Maricopa, CAThu, May 4, 3:31 PM PDT · 17681 days ago · 15 km deep · 61 km away
13. 1.96km NNE of Sunland, CAFri, May 5, 8:47 AM PDT · 17680 days ago · 7 km deep · 96 km away
14. 1.918km NNW of Tehachapi, CASat, May 6, 6:10 PM PDT · 17678 days ago · 4 km deep · 47 km away
15. 2.06km ESE of Wofford Heights, CASun, May 7, 6:31 PM PDT · 17677 days ago · 7 km deep · 91 km away
16. 2.17km ESE of Wofford Heights, CASun, May 7, 6:34 PM PDT · 17677 days ago · 6 km deep · 91 km away
17. 1.710km ESE of Wofford Heights, CASun, May 7, 10:33 PM PDT · 17677 days ago · 6 km deep · 90 km away
18. 1.616km NNW of Grapevine, CAMon, May 8, 2:07 AM PDT · 17677 days ago · 6 km deep · 13 km away
19. 1.88km NW of Fillmore, CAWed, May 10, 12:36 PM PDT · 17675 days ago · 0 km deep · 61 km away
20. 2.12km NNW of Simi Valley, CATue, May 16, 1:33 AM PDT · 17669 days ago · 11 km deep · 80 km away
21. 2.118km NW of Tehachapi, CATue, May 16, 9:33 AM PDT · 17669 days ago · 5 km deep · 42 km away
22. 2.023km ENE of Arvin, CAFri, May 19, 12:49 AM PDT · 17666 days ago · 6 km deep · 44 km away
23. 2.06km SW of Shafter, CASat, May 20, 11:40 PM PDT · 17664 days ago · 6 km deep · 65 km away
24. 1.86km W of California City, CATue, May 23, 11:55 AM PDT · 17662 days ago · 6 km deep · 80 km away
25. 1.710km WNW of Neenach, CAWed, May 24, 4:44 AM PDT · 17661 days ago · 6 km deep · 28 km away
26. 1.512km SW of Lamont, CASat, May 27, 4:05 PM PDT · 17658 days ago · 6 km deep · 24 km away
27. 2.29km NNE of Simi Valley, CASat, May 27, 5:17 PM PDT · 17657 days ago · 15 km deep · 75 km away
28. 2.126km NE of Arvin, CASun, May 28, 2:52 PM PDT · 17657 days ago · 0 km deep · 50 km away
29. 1.917km SSE of Carpinteria, CAThu, Jun 1, 12:24 AM PDT · 17653 days ago · 0 km deep · 96 km away
30. 1.819km SE of Arvin, CAThu, Jun 1, 8:27 PM PDT · 17652 days ago · 11 km deep · 22 km away
31. 2.917km ENE of Taft, CAFri, Jun 2, 7:39 AM PDT · 17652 days ago · 8 km deep · 43 km away
32. 2.217km SE of Bodfish, CAFri, Jun 2, 10:42 AM PDT · 17652 days ago · 14 km deep · 71 km away
33. 2.29km NNE of Lake View Terrace, CASat, Jun 3, 4:14 AM PDT · 17651 days ago · 5 km deep · 91 km away
34. 1.820km SSE of Bodfish, CASat, Jun 3, 9:19 AM PDT · 17651 days ago · 6 km deep · 66 km away
35. 1.810km SW of Agua Dulce, CATue, Jun 6, 3:37 AM PDT · 17648 days ago · 11 km deep · 79 km away
36. 1.88km SE of Santa Clarita, CATue, Jun 6, 6:02 PM PDT · 17647 days ago · 13 km deep · 82 km away
37. 2.417km SW of Arvin, CAWed, Jun 7, 7:47 PM PDT · 17646 days ago · 5 km deep · 15 km away
38. 1.711km SSE of Buttonwillow, CAThu, Jun 8, 2:33 AM PDT · 17646 days ago · 14 km deep · 58 km away
39. 1.516km SSW of Lamont, CAThu, Jun 8, 9:12 AM PDT · 17646 days ago · 7 km deep · 16 km away
40. 1.816km SSW of Lamont, CAThu, Jun 8, 9:12 AM PDT · 17646 days ago · 1 km deep · 16 km away
41. 2.46km W of Buttonwillow, CAFri, Jun 9, 1:57 AM PDT · 17645 days ago · 24 km deep · 72 km away
42. 2.612km W of Grapevine, CASat, Jun 10, 7:01 AM PDT · 17644 days ago · 7 km deep · 15 km away
43. 2.313km S of Bodfish, CASat, Jun 10, 7:10 PM PDT · 17643 days ago · 6 km deep · 65 km away
44. 1.710km E of Santa Clarita, CASun, Jun 11, 2:26 AM PDT · 17643 days ago · 8 km deep · 81 km away
45. 1.56km NW of Vincent, CASun, Jun 11, 4:06 AM PDT · 17643 days ago · 14 km deep · 85 km away
46. 2.18km NE of Santa Clarita, CASun, Jun 11, 7:25 AM PDT · 17643 days ago · 15 km deep · 72 km away
47. 1.618km NE of Tehachapi, CASun, Jun 11, 9:00 PM PDT · 17642 days ago · 6 km deep · 63 km away
48. 2.420km SE of Bodfish, CAMon, Jun 12, 7:49 AM PDT · 17642 days ago · 0 km deep · 72 km away
49. 2.89km SSW of Valencia, CATue, Jun 13, 9:27 PM PDT · 17640 days ago · 3 km deep · 73 km away
50. 1.821km NNW of Tehachapi, CAWed, Jun 14, 6:24 AM PDT · 17640 days ago · 1 km deep · 49 km away
51. 1.616km NE of Tehachapi, CAThu, Jun 15, 7:04 PM PDT · 17638 days ago · 1 km deep · 61 km away
52. 1.817km NE of Tehachapi, CAThu, Jun 15, 8:21 PM PDT · 17638 days ago · 6 km deep · 61 km away
53. 4.221km WNW of Grapevine, CAThu, Jun 15, 9:21 PM PDT · 17638 days ago · 11 km deep · 20 km away
54. 2.922km N of Pine Mountain Club, CAThu, Jun 15, 10:43 PM PDT · 17638 days ago · 0 km deep · 22 km away
55. 1.818km ESE of Arvin, CAThu, Jun 15, 11:29 PM PDT · 17638 days ago · 8 km deep · 32 km away
56. 2.325km NE of Arvin, CAFri, Jun 16, 4:00 AM PDT · 17638 days ago · 0 km deep · 50 km away
57. 1.512km SE of Arvin, CASat, Jun 17, 9:05 PM PDT · 17636 days ago · 6 km deep · 25 km away
58. 2.419km S of Carpinteria, CASun, Jun 18, 8:44 PM PDT · 17635 days ago · 11 km deep · 100 km away
59. 2.116km ENE of Ojai, CATue, Jun 20, 1:34 PM PDT · 17634 days ago · 18 km deep · 54 km away

Before

1. 1.718km NNW of California City, CAThu, Apr 20, 1:27 PM PST · 17695 days ago · 6 km deep · 87 km away
2. 1.719km S of Carpinteria, CAWed, Apr 19, 1:06 AM PST · 17696 days ago · 17 km deep · 100 km away
3. 2.019km S of Carpinteria, CATue, Apr 18, 10:53 PM PST · 17696 days ago · 14 km deep · 99 km away
4. 1.818km S of Carpinteria, CATue, Apr 18, 10:33 PM PST · 17696 days ago · 14 km deep · 99 km away
5. 1.818km NNW of Fillmore, CAMon, Apr 17, 4:50 PM PST · 17697 days ago · 21 km deep · 49 km away
6. 1.725km N of Tehachapi, CASun, Apr 16, 2:17 PM PST · 17699 days ago · 0 km deep · 59 km away
7. 2.519km S of Carpinteria, CASat, Apr 15, 10:39 PM PST · 17699 days ago · 15 km deep · 100 km away
8. 2.518km S of Carpinteria, CASat, Apr 15, 8:54 AM PST · 17700 days ago · 16 km deep · 99 km away
9. 3.111km NE of Simi Valley, CASat, Apr 15, 4:38 AM PST · 17700 days ago · 15 km deep · 74 km away
10. 1.93km SSW of Chatsworth, CAFri, Apr 14, 10:05 PM PST · 17700 days ago · 4 km deep · 89 km away
11. 2.618km NNW of Tehachapi, CAThu, Apr 13, 4:55 AM PST · 17702 days ago · 5 km deep · 45 km away
12. 2.219km S of Carpinteria, CAThu, Apr 13, 1:24 AM PST · 17702 days ago · 10 km deep · 99 km away
13. 1.819km S of Carpinteria, CAWed, Apr 12, 9:10 PM PST · 17702 days ago · 11 km deep · 100 km away
14. 2.419km S of Carpinteria, CAWed, Apr 12, 7:12 PM PST · 17702 days ago · 12 km deep · 100 km away
15. 1.718km S of Carpinteria, CAWed, Apr 12, 4:17 PM PST · 17702 days ago · 11 km deep · 99 km away
16. 1.816km SSW of Neenach, CAWed, Apr 12, 5:54 AM PST · 17703 days ago · 12 km deep · 47 km away
17. 1.712km ESE of Piru, CAWed, Apr 12, 4:31 AM PST · 17703 days ago · 19 km deep · 73 km away
18. 1.722km NW of Tehachapi, CATue, Apr 11, 7:08 PM PST · 17703 days ago · 2 km deep · 45 km away
19. 1.716km N of Castaic, CATue, Apr 11, 5:33 PM PST · 17703 days ago · 14 km deep · 47 km away
20. 2.319km S of Carpinteria, CATue, Apr 11, 3:46 PM PST · 17704 days ago · 13 km deep · 99 km away

From the USGS Earthquake Hazards Program and its partner networks, event ci3339007. Read Wed, Sep 30, 2026, 11:39 AM UTC.