M1.5 earthquake 5km SE of Ontario, CA

Magnitude

1.5 (mc), micro

Local time

Fri, Oct 16, 1981, 9:11 AM PDT

UTC

1981-10-16 16:11:39 UTC

Depth

5.4 km (3.4 mi), shallow

Epicenter

34.019° N, 117.591° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 1.2 km in depth

Depth from

From location

Station coverage gap

71°

Stations used

31

• Eastvale, CaliforniaPopulation 59,039. Forecast7 kmNNW
• Ontario, CaliforniaPopulation 171,214. Forecast7 kmSE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast60 kmE

After

1. 1.511km W of Anza, CAFri, Oct 16, 7:40 PM PDT · 16412 days ago · 2 km deep · 91 km away
2. 1.64km NNE of Cabazon, CASat, Oct 17, 12:10 AM PDT · 16412 days ago · 16 km deep · 76 km away
3. 1.53km S of San Bernardino, CASat, Oct 17, 7:25 AM PDT · 16411 days ago · 3 km deep · 29 km away
4. 2.33km S of San Bernardino, CASat, Oct 17, 7:29 AM PDT · 16411 days ago · 3 km deep · 29 km away
5. 1.73km SSW of San Bernardino, CASat, Oct 17, 6:12 PM PDT · 16411 days ago · 3 km deep · 29 km away
6. 1.611km SW of Anza, CASat, Oct 17, 6:16 PM PDT · 16411 days ago · 3 km deep · 96 km away
7. 2.29km ENE of Aguanga, CASun, Oct 18, 6:58 PM PDT · 16410 days ago · 2 km deep · 96 km away
8. 1.69km SW of Idyllwild, CAMon, Oct 19, 4:23 AM PDT · 16409 days ago · 13 km deep · 82 km away
9. 2.317km NW of Yucca Valley, CAMon, Oct 19, 9:04 AM PDT · 16409 days ago · 8 km deep · 97 km away
10. 2.513km N of Claremont, CAMon, Oct 19, 8:17 PM PDT · 16409 days ago · 6 km deep · 25 km away
11. 1.99km ENE of Aguanga, CATue, Oct 20, 7:58 AM PDT · 16408 days ago · 4 km deep · 96 km away
12. 3.310km NE of Aguanga, CATue, Oct 20, 10:37 PM PDT · 16408 days ago · 6 km deep · 95 km away
13. 1.89km SE of Valle Vista, CAWed, Oct 21, 9:44 AM PDT · 16407 days ago · 16 km deep · 80 km away
14. 1.79km SE of Big Bear City, CAWed, Oct 21, 9:21 PM PDT · 16407 days ago · 8 km deep · 76 km away
15. 1.64km WNW of Lake Arrowhead, CAThu, Oct 22, 10:52 AM PDT · 16406 days ago · 3 km deep · 43 km away
16. 1.811km WSW of El Segundo, CAThu, Oct 22, 8:36 PM PDT · 16406 days ago · 14 km deep · 88 km away
17. 2.56km SSW of Redlands, CAThu, Oct 22, 8:50 PM PDT · 16406 days ago · 12 km deep · 36 km away
18. 1.70km WNW of Muscoy, CAThu, Oct 22, 10:46 PM PDT · 16406 days ago · 2 km deep · 27 km away
19. 2.410km SE of San Pedro, CAThu, Oct 22, 11:32 PM PDT · 16406 days ago · 14 km deep · 69 km away
20. 1.54km ENE of Wrightwood, CAFri, Oct 23, 8:18 AM PDT · 16405 days ago · 8 km deep · 40 km away
21. 1.78km NNE of Cabazon, CAFri, Oct 23, 3:40 PM PDT · 16405 days ago · 16 km deep · 78 km away
22. 2.79km S of Littlerock, CASat, Oct 24, 12:10 PM PDT · 16404 days ago · 5 km deep · 60 km away
23. 1.62km SW of Marina del Rey, CASat, Oct 24, 4:43 PM PDT · 16404 days ago · 11 km deep · 81 km away
24. 1.57km SSW of Lytle Creek, CASat, Oct 24, 11:22 PM PDT · 16404 days ago · 5 km deep · 21 km away
25. 1.80km SW of La Palma, CASat, Oct 24, 11:52 PM PDT · 16404 days ago · 2 km deep · 47 km away
26. 2.14km N of Granada Hills, CASun, Oct 25, 1:15 AM PDT · 16404 days ago · 3 km deep · 89 km away
27. 2.211km NNE of Aguanga, CASun, Oct 25, 2:47 PM PST · 16403 days ago · 5 km deep · 91 km away
28. 1.61km SW of Cerritos, CAMon, Oct 26, 2:18 PM PST · 16402 days ago · 5 km deep · 49 km away
29. 1.72km ESE of Loma Linda, CAWed, Oct 28, 2:45 AM PST · 16400 days ago · 17 km deep · 32 km away
30. 1.618km NNE of Big Bear City, CAWed, Oct 28, 4:24 AM PST · 16400 days ago · 3 km deep · 86 km away
31. 3.06km N of Granada Hills, CAWed, Oct 28, 6:17 AM PST · 16400 days ago · 4 km deep · 91 km away
32. 1.88km NNW of Granada Hills, CAWed, Oct 28, 6:41 AM PST · 16400 days ago · 3 km deep · 93 km away
33. 1.77km NNW of Granada Hills, CAWed, Oct 28, 12:04 PM PST · 16400 days ago · 9 km deep · 92 km away
34. 1.62km SW of Westwood, CAWed, Oct 28, 8:39 PM PST · 16400 days ago · 13 km deep · 79 km away
35. 1.610km ENE of Aguanga, CAThu, Oct 29, 2:47 AM PST · 16399 days ago · 4 km deep · 96 km away
36. 1.714km WSW of Hermosa Beach, CAFri, Oct 30, 10:27 AM PST · 16398 days ago · 6 km deep · 91 km away
37. 2.24km SE of Rancho Cucamonga, CASat, Oct 31, 12:01 AM PST · 16398 days ago · 12 km deep · 10 km away
38. 2.69km ENE of Aguanga, CASat, Oct 31, 11:51 AM PST · 16397 days ago · 4 km deep · 96 km away
39. 1.99km ENE of Aguanga, CASat, Oct 31, 2:22 PM PST · 16397 days ago · 4 km deep · 96 km away
40. 1.75km N of Big Bear City, CAMon, Nov 2, 10:06 AM PST · 16395 days ago · 0 km deep · 75 km away
41. 1.88km NNE of San Jacinto, CATue, Nov 3, 5:09 AM PST · 16394 days ago · 12 km deep · 65 km away
42. 1.510km WSW of Anza, CATue, Nov 3, 6:10 AM PST · 16394 days ago · 4 km deep · 94 km away
43. 2.414km S of Las Flores, CAWed, Nov 4, 3:54 AM PST · 16393 days ago · 5 km deep · 97 km away
44. 2.13km NW of Newport Beach, CAThu, Nov 5, 9:10 AM PST · 16392 days ago · 13 km deep · 53 km away
45. 1.68km NNW of Big Bear City, CAFri, Nov 6, 7:49 AM PST · 16391 days ago · 9 km deep · 74 km away
46. 1.511km WNW of Camp Pendleton South, CAFri, Nov 6, 12:37 PM PST · 16391 days ago · 5 km deep · 85 km away
47. 1.612km WNW of Camp Pendleton South, CAFri, Nov 6, 12:37 PM PST · 16391 days ago · 5 km deep · 85 km away
48. 1.612km WNW of Camp Pendleton South, CAFri, Nov 6, 12:53 PM PST · 16391 days ago · 5 km deep · 85 km away
49. 1.712km W of Camp Pendleton South, CAFri, Nov 6, 12:54 PM PST · 16391 days ago · 5 km deep · 86 km away
50. 1.813km WNW of Camp Pendleton South, CAFri, Nov 6, 11:45 PM PST · 16391 days ago · 5 km deep · 85 km away
51. 1.512km WNW of Camp Pendleton South, CASat, Nov 7, 3:40 AM PST · 16390 days ago · 8 km deep · 85 km away
52. 2.814km WNW of Camp Pendleton South, CASat, Nov 7, 3:42 AM PST · 16390 days ago · 6 km deep · 85 km away
53. 1.813km WNW of Camp Pendleton South, CASat, Nov 7, 4:19 AM PST · 16390 days ago · 5 km deep · 85 km away
54. 1.613km WNW of Camp Pendleton South, CASat, Nov 7, 5:27 AM PST · 16390 days ago · 5 km deep · 85 km away
55. 1.512km WNW of Camp Pendleton South, CASat, Nov 7, 2:34 PM PST · 16390 days ago · 14 km deep · 84 km away
56. 1.712km N of Banning, CASat, Nov 7, 6:40 PM PST · 16390 days ago · 15 km deep · 68 km away
57. 1.813km WNW of Camp Pendleton South, CASun, Nov 8, 6:50 AM PST · 16389 days ago · 7 km deep · 86 km away
58. 1.613km WNW of Camp Pendleton South, CASun, Nov 8, 3:32 PM PST · 16389 days ago · 10 km deep · 86 km away
59. 2.614km WNW of Camp Pendleton South, CASun, Nov 8, 4:47 PM PST · 16389 days ago · 6 km deep · 86 km away
60. 2.04km WSW of Hermosa Beach, CAMon, Nov 9, 9:08 PM PST · 16388 days ago · 10 km deep · 81 km away

The first 60 of 102.

Before

1. 1.512km W of Anza, CAThu, Oct 15, 6:15 PM PDT · 16413 days ago · 4 km deep · 91 km away
2. 2.110km SSW of Rancho Palos Verdes, CAThu, Oct 15, 3:37 PM PDT · 16413 days ago · 5 km deep · 87 km away
3. 1.610km NE of Aguanga, CAThu, Oct 15, 11:28 AM PDT · 16413 days ago · 1 km deep · 94 km away
4. 1.512km W of Anza, CAThu, Oct 15, 8:02 AM PDT · 16413 days ago · 2 km deep · 91 km away
5. 2.412km WSW of Anza, CAThu, Oct 15, 7:41 AM PDT · 16413 days ago · 4 km deep · 91 km away
6. 1.59km ENE of Villa Park, CAWed, Oct 14, 6:09 PM PDT · 16414 days ago · 8 km deep · 23 km away
7. 1.94km SSE of Loma Linda, CAWed, Oct 14, 10:26 AM PDT · 16414 days ago · 13 km deep · 32 km away
8. 2.07km SE of Santa Clarita, CAWed, Oct 14, 3:56 AM PDT · 16414 days ago · 11 km deep · 89 km away
9. 1.86km SSW of Banning, CAMon, Oct 12, 10:04 AM PDT · 16416 days ago · 11 km deep · 66 km away
10. 1.832km SSW of Dana Point, CAMon, Oct 12, 3:30 AM PDT · 16416 days ago · 6 km deep · 93 km away
11. 1.911km WSW of Anza, CASun, Oct 11, 4:43 AM PDT · 16417 days ago · 4 km deep · 95 km away
12. 1.75km NNE of Cabazon, CASun, Oct 11, 12:41 AM PDT · 16418 days ago · 17 km deep · 77 km away
13. 2.019km NE of Lucerne Valley, CASat, Oct 10, 8:56 AM PDT · 16418 days ago · -2 km deep · 92 km away
14. 1.63km E of Inglewood, CASat, Oct 10, 2:50 AM PDT · 16418 days ago · 5 km deep · 67 km away
15. 1.64km ESE of Inglewood, CASat, Oct 10, 2:10 AM PDT · 16419 days ago · 5 km deep · 66 km away
16. 1.64km ESE of Inglewood, CASat, Oct 10, 2:09 AM PDT · 16419 days ago · 5 km deep · 67 km away
17. 1.63km ESE of Inglewood, CASat, Oct 10, 2:05 AM PDT · 16419 days ago · 1 km deep · 67 km away
18. 1.92km E of Inglewood, CASat, Oct 10, 1:57 AM PDT · 16419 days ago · 10 km deep · 68 km away
19. 2.35km E of Calimesa, CAThu, Oct 8, 1:24 PM PDT · 16420 days ago · 13 km deep · 55 km away
20. 2.46km WSW of Lucerne Valley, CAThu, Oct 8, 11:11 AM PDT · 16420 days ago · 1 km deep · 69 km away

From the USGS Earthquake Hazards Program and its partner networks, event ci525613. Read Tue, Sep 22, 2026, 8:45 PM UTC.