M1.8 earthquake 8km W of El Segundo, CA

Magnitude

1.8 (Mh), micro

Magnitude from

Southern California Seismic Network

Local time

Tue, Apr 21, 1981, 4:44 AM PST

UTC

1981-04-21 12:44:32 UTC

Depth

9.8 km (6.1 mi), shallow

Epicenter

33.911° N, 118.504° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.3 km horizontally, 3.8 km in depth

Depth from

From location

Station coverage gap

192°, poorly surrounded by stations

Stations used

16

• El Segundo, CaliforniaPopulation 17,037. Forecast8 kmW
• Inglewood, CaliforniaPopulation 111,666. Forecast15 kmWSW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast29 kmWSW

After

1. 2.32km NW of Costa Mesa, CATue, Apr 21, 5:36 AM PST · 16599 days ago · 4 km deep · 60 km away
2. 1.93km SW of Lake Los Angeles, CATue, Apr 21, 8:59 AM PST · 16599 days ago · 5 km deep · 97 km away
3. 1.511km NW of Fillmore, CAWed, Apr 22, 1:22 AM PST · 16598 days ago · 1 km deep · 77 km away
4. 1.54km NW of Yorba Linda, CAWed, Apr 22, 10:56 PM PST · 16598 days ago · 14 km deep · 61 km away
5. 2.05km N of Yorba Linda, CAWed, Apr 22, 11:04 PM PST · 16598 days ago · 6 km deep · 63 km away
6. 2.56km NW of Santa Cruz Is. (E end), CAFri, Apr 24, 11:53 AM PST · 16596 days ago · 17 km deep · 99 km away
7. 2.25km NW of Santa Cruz Is. (E end), CAFri, Apr 24, 11:56 AM PST · 16596 days ago · 21 km deep · 99 km away
8. 2.02km NNW of Brea, CASun, Apr 26, 6:45 PM PDT · 16594 days ago · 7 km deep · 55 km away
9. 1.54km N of Huntington Park, CAMon, Apr 27, 1:47 PM PDT · 16593 days ago · 11 km deep · 28 km away
10. 1.731km NNE of Santa Barbara Is., CATue, Apr 28, 12:32 PM PDT · 16592 days ago · 6 km deep · 48 km away
11. 1.55km ESE of Santa Clarita, CAWed, Apr 29, 1:18 AM PDT · 16592 days ago · 15 km deep · 54 km away
12. 2.020km SSE of Carpinteria, CAWed, Apr 29, 11:54 AM PDT · 16591 days ago · 12 km deep · 94 km away
13. 1.720km SSE of Carpinteria, CAWed, Apr 29, 12:15 PM PDT · 16591 days ago · 15 km deep · 95 km away
14. 1.61km SE of MacArthur Park, CAFri, May 1, 4:18 AM PDT · 16589 days ago · 10 km deep · 26 km away
15. 2.028km S of Malibu, CAFri, May 1, 12:14 PM PDT · 16589 days ago · 6 km deep · 37 km away
16. 1.72km SW of Los Angeles, CASat, May 2, 3:40 AM PDT · 16588 days ago · 10 km deep · 26 km away
17. 2.15km N of Sunland, CASun, May 3, 11:44 PM PDT · 16587 days ago · 3 km deep · 47 km away
18. 2.51km WSW of Port Hueneme, CAMon, May 4, 4:10 PM PDT · 16586 days ago · 10 km deep · 70 km away
19. 3.04km NW of Huntington Beach, CATue, May 5, 10:56 PM PDT · 16585 days ago · 7 km deep · 48 km away
20. 1.913km SSE of Malibu Beach, CAThu, May 7, 3:26 AM PDT · 16583 days ago · 13 km deep · 15 km away
21. 2.13km NNW of Maywood, CAFri, May 8, 1:03 PM PDT · 16582 days ago · 14 km deep · 31 km away
22. 2.511km E of Santa Clarita, CAFri, May 8, 9:38 PM PDT · 16582 days ago · 5 km deep · 56 km away
23. 1.522km S of Rancho Palos Verdes, CASun, May 10, 6:31 AM PDT · 16580 days ago · 5 km deep · 43 km away
24. 2.520km S of San Pedro, CAFri, May 15, 9:16 PM PDT · 16575 days ago · 4 km deep · 43 km away
25. 2.23km SSW of Los Angeles, CASat, May 16, 6:56 PM PDT · 16574 days ago · 4 km deep · 26 km away
26. 2.111km W of Corona, CAMon, May 18, 5:48 PM PDT · 16572 days ago · 4 km deep · 75 km away
27. 1.82km S of MacArthur Park, CAWed, May 20, 10:05 AM PDT · 16570 days ago · 7 km deep · 25 km away
28. 1.52km S of Artesia, CAWed, May 20, 11:47 AM PDT · 16570 days ago · 5 km deep · 39 km away
29. 2.07km NE of San Clemente Is. (NW tip), CAThu, May 21, 8:45 PM PDT · 16569 days ago · 14 km deep · 93 km away
30. 1.922km NNE of Ojai, CAFri, May 22, 8:40 PM PDT · 16568 days ago · 2 km deep · 96 km away
31. 1.51km SW of MacArthur Park, CASat, May 23, 1:39 PM PDT · 16567 days ago · 9 km deep · 25 km away
32. 1.51km SSE of MacArthur Park, CASun, May 24, 4:57 AM PDT · 16566 days ago · 8 km deep · 26 km away
33. 2.58km NNW of Fontana, CAMon, May 25, 9:13 AM PDT · 16565 days ago · 5 km deep · 97 km away
34. 2.02km S of Lynwood, CATue, May 26, 3:07 AM PDT · 16564 days ago · 5 km deep · 27 km away
35. 2.01km NNW of West Hills, CAThu, May 28, 11:36 AM PDT · 16562 days ago · 3 km deep · 35 km away
36. 2.11km SW of Paramount, CAFri, May 29, 6:39 AM PDT · 16561 days ago · 8 km deep · 31 km away
37. 1.933km N of Santa Barbara Is., CASun, May 31, 10:55 PM PDT · 16559 days ago · 6 km deep · 52 km away
38. 3.34km NW of Rancho Cucamonga, CATue, Jun 2, 10:29 PM PDT · 16557 days ago · 7 km deep · 86 km away
39. 2.127km WSW of Rancho Palos Verdes, CATue, Jun 2, 11:06 PM PDT · 16557 days ago · 5 km deep · 33 km away
40. 1.824km SW of Dana Point, CAWed, Jun 3, 4:54 AM PDT · 16556 days ago · 5 km deep · 87 km away
41. 2.131km WSW of Rancho Palos Verdes, CAWed, Jun 3, 4:20 PM PDT · 16556 days ago · 5 km deep · 36 km away
42. 2.34km NE of Carson, CAWed, Jun 3, 11:11 PM PDT · 16556 days ago · 18 km deep · 23 km away
43. 1.86km WNW of Mira Loma, CAFri, Jun 5, 8:40 PM PDT · 16554 days ago · 12 km deep · 86 km away
44. 1.81km SSE of Caltech, Pasadena, CASat, Jun 6, 12:14 AM PDT · 16554 days ago · 14 km deep · 43 km away
45. 1.78km NNW of Fontana, CASat, Jun 6, 9:18 PM PDT · 16553 days ago · 5 km deep · 97 km away
46. 1.931km S of Malibu, CASun, Jun 7, 9:23 AM PDT · 16552 days ago · 5 km deep · 37 km away
47. 1.50km E of Compton, CAWed, Jun 10, 7:06 PM PDT · 16549 days ago · 5 km deep · 27 km away
48. 3.811km NE of Simi Valley, CAThu, Jun 11, 11:06 PM PDT · 16548 days ago · 13 km deep · 51 km away
49. 2.35km WSW of Valencia, CAFri, Jun 12, 8:22 PM PDT · 16547 days ago · 4 km deep · 59 km away
50. 1.518km S of Port Hueneme, CAWed, Jun 17, 4:09 AM PDT · 16542 days ago · 1 km deep · 62 km away
51. 1.516km SSE of Port Hueneme, CAWed, Jun 17, 4:20 AM PDT · 16542 days ago · 1 km deep · 60 km away
52. 2.612km SSE of Malibu Beach, CAWed, Jun 17, 10:31 PM PDT · 16542 days ago · 8 km deep · 14 km away
53. 2.010km S of Malibu Beach, CAThu, Jun 18, 1:00 AM PDT · 16542 days ago · 9 km deep · 18 km away

Before

1. 1.512km NW of Fillmore, CATue, Apr 14, 5:23 PM PST · 16606 days ago · 4 km deep · 78 km away
2. 2.36km WSW of Newport Beach, CATue, Apr 14, 4:34 PM PST · 16606 days ago · 1 km deep · 59 km away
3. 1.712km SW of Port Hueneme, CASun, Apr 12, 8:33 PM PST · 16608 days ago · 20 km deep · 74 km away
4. 1.710km W of Palos Verdes Estates, CAWed, Apr 8, 6:10 PM PST · 16612 days ago · 10 km deep · 13 km away
5. 1.97km SW of Pearblossum, CAWed, Apr 8, 4:56 AM PST · 16612 days ago · 8 km deep · 79 km away
6. 2.018km N of Avalon, CASat, Apr 4, 10:50 PM PST · 16616 days ago · -1 km deep · 49 km away
7. 2.12km NE of Thousand Oaks, CASat, Apr 4, 2:05 PM PST · 16616 days ago · 24 km deep · 46 km away
8. 1.54km NE of Thousand Oaks, CASat, Apr 4, 2:05 PM PST · 16616 days ago · 17 km deep · 46 km away
9. 1.72km W of Huntington Beach, CAFri, Apr 3, 11:47 AM PST · 16617 days ago · 5 km deep · 51 km away
10. 2.012km SW of Rancho Palos Verdes, CAThu, Apr 2, 9:00 AM PST · 16618 days ago · 6 km deep · 27 km away
11. 1.68km NE of Santa Clarita, CAWed, Apr 1, 8:06 AM PST · 16619 days ago · 14 km deep · 63 km away
12. 1.77km E of San Pedro, CAWed, Apr 1, 4:52 AM PST · 16619 days ago · 5 km deep · 33 km away
13. 2.316km WNW of Malibu, CATue, Mar 31, 3:36 AM PST · 16620 days ago · 5 km deep · 46 km away
14. 2.17km NNW of Fontana, CAMon, Mar 30, 9:37 AM PST · 16621 days ago · 5 km deep · 97 km away
15. 1.61km NW of Los Alamitos, CASat, Mar 28, 4:55 AM PST · 16623 days ago · 2 km deep · 41 km away
16. 1.92km W of Huntington Beach, CASat, Mar 28, 3:11 AM PST · 16623 days ago · 4 km deep · 51 km away
17. 2.08km SSW of Malibu Beach, CAFri, Mar 27, 4:57 PM PST · 16624 days ago · 15 km deep · 21 km away
18. 2.14km NNW of Vincent, CAMon, Mar 23, 8:06 AM PST · 16628 days ago · 0 km deep · 78 km away

From the USGS Earthquake Hazards Program and its partner networks, event ci514730. Read Thu, Oct 1, 2026, 8:03 PM UTC.