M1.7 earthquake 4km SSW of Brawley, CA

Magnitude

1.7 (Mc), micro

Magnitude from

Southern California Seismic Network

Local time

Sat, May 20, 1978, 5:39 PM PDT

UTC

1978-05-21 00:39:22 UTC

Depth

10.0 km (6.2 mi), shallow

Epicenter

32.944° N, 115.541° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.8 km horizontally, 31.6 km in depth

Depth from

Operator assigned

Station coverage gap

77°

Stations used

14

• Brawley, CaliforniaPopulation 25,897. Forecast4 kmSSW
• Mexicali, MexicoPopulation 1,032,686. Forecast36 kmNNW

After

1. 2.04km SSW of Brawley, CASat, May 20, 5:41 PM PDT · 17666 days ago · 10 km deep · 1 km away
2. 1.64km SSW of Brawley, CASat, May 20, 5:42 PM PDT · 17666 days ago · 10 km deep · 0 km away
3. 1.54km S of Brawley, CASat, May 20, 6:04 PM PDT · 17666 days ago · 10 km deep · 2 km away
4. 1.54km S of Brawley, CASat, May 20, 6:51 PM PDT · 17666 days ago · 10 km deep · 0 km away
5. 1.814km S of Borrego Springs, CASat, May 20, 9:35 PM PDT · 17666 days ago · 6 km deep · 80 km away
6. 1.89km N of Borrego Springs, CASat, May 20, 9:52 PM PDT · 17666 days ago · 12 km deep · 90 km away
7. 1.99km N of Borrego Springs, CASat, May 20, 9:54 PM PDT · 17666 days ago · 12 km deep · 90 km away
8. 1.810km NNE of Julian, CASun, May 21, 10:13 PM PDT · 17665 days ago · 16 km deep · 98 km away
9. 1.67km WNW of Westmorland, CAMon, May 22, 5:16 AM PDT · 17665 days ago · 7 km deep · 19 km away
10. 1.92km SE of Borrego Springs, CAMon, May 22, 1:29 PM PDT · 17665 days ago · 13 km deep · 83 km away
11. 2.49km SW of Delta, B.C., MXMon, May 22, 8:13 PM PDT · 17664 days ago · 6 km deep · 75 km away
12. 1.84km E of Puebla, B.C., MXMon, May 22, 10:01 PM PDT · 17664 days ago · 10 km deep · 47 km away
13. 3.26km ENE of Puebla, B.C., MXMon, May 22, 10:01 PM PDT · 17664 days ago · 10 km deep · 47 km away
14. 1.83km ESE of Bombay Beach, CAMon, May 22, 10:20 PM PDT · 17664 days ago · 5 km deep · 46 km away
15. 2.26km E of Puebla, B.C., MXMon, May 22, 10:30 PM PDT · 17664 days ago · 10 km deep · 49 km away
16. 1.63km ESE of Bombay Beach, CAMon, May 22, 10:43 PM PDT · 17664 days ago · 4 km deep · 47 km away
17. 2.06km E of Puebla, B.C., MXTue, May 23, 3:00 AM PDT · 17664 days ago · 10 km deep · 49 km away
18. 2.06km E of Puebla, B.C., MXTue, May 23, 3:53 AM PDT · 17664 days ago · 10 km deep · 49 km away
19. 2.06km N of Guadalupe Victoria, B.C., MXTue, May 23, 5:01 AM PDT · 17664 days ago · 6 km deep · 79 km away
20. 1.511km N of Borrego Springs, CATue, May 23, 1:33 PM PDT · 17664 days ago · 14 km deep · 90 km away
21. 1.66km E of Westmorland, CATue, May 23, 1:34 PM PDT · 17664 days ago · 9 km deep · 11 km away
22. 1.76km WNW of Westmorland, CATue, May 23, 2:14 PM PDT · 17664 days ago · 7 km deep · 18 km away
23. 1.711km ENE of Mexicali, B.C., MXWed, May 24, 6:17 PM PDT · 17662 days ago · 6 km deep · 33 km away
24. 1.58km ENE of Imperial, CAThu, May 25, 6:28 AM PDT · 17662 days ago · 6 km deep · 10 km away
25. 1.68km ENE of Imperial, CAThu, May 25, 9:08 AM PDT · 17662 days ago · 6 km deep · 10 km away
26. 2.28km E of Imperial, CAThu, May 25, 9:10 AM PDT · 17662 days ago · 10 km deep · 12 km away
27. 2.28km E of Imperial, CAThu, May 25, 10:28 AM PDT · 17662 days ago · 10 km deep · 12 km away
28. 2.07km ENE of Imperial, CAThu, May 25, 10:29 AM PDT · 17662 days ago · 10 km deep · 10 km away
29. 2.38km E of Imperial, CAThu, May 25, 10:30 AM PDT · 17662 days ago · 10 km deep · 12 km away
30. 2.08km E of Imperial, CAThu, May 25, 12:51 PM PDT · 17662 days ago · 10 km deep · 11 km away
31. 2.68km E of Imperial, CAThu, May 25, 12:53 PM PDT · 17662 days ago · 10 km deep · 11 km away
32. 1.97km E of Imperial, CAThu, May 25, 12:56 PM PDT · 17662 days ago · 6 km deep · 11 km away
33. 1.616km E of Ocotillo Wells, CAThu, May 25, 1:38 PM PDT · 17662 days ago · 10 km deep · 46 km away
34. 1.819km SW of Ocotillo Wells, CAThu, May 25, 3:59 PM PDT · 17661 days ago · 11 km deep · 69 km away
35. 2.07km E of Imperial, CAThu, May 25, 6:32 PM PDT · 17661 days ago · 10 km deep · 11 km away
36. 1.716km N of Ocotillo Wells, CAThu, May 25, 10:20 PM PDT · 17661 days ago · 6 km deep · 69 km away
37. 2.78km E of Imperial, CAFri, May 26, 7:12 AM PDT · 17661 days ago · 10 km deep · 12 km away
38. 2.38km E of Imperial, CAFri, May 26, 12:32 PM PDT · 17661 days ago · 10 km deep · 12 km away
39. 1.67km ENE of Imperial, CAFri, May 26, 1:17 PM PDT · 17661 days ago · 8 km deep · 10 km away
40. 1.87km E of Imperial, CAFri, May 26, 2:18 PM PDT · 17661 days ago · 6 km deep · 11 km away
41. 1.610km NE of Calexico, CAFri, May 26, 5:50 PM PDT · 17660 days ago · 10 km deep · 26 km away
42. 1.68km ENE of Imperial, CAFri, May 26, 7:09 PM PDT · 17660 days ago · 6 km deep · 10 km away
43. 1.922km SSW of Ocotillo Wells, CAFri, May 26, 9:46 PM PDT · 17660 days ago · 15 km deep · 66 km away
44. 2.614km W of Alberto Oviedo Mota, B.C., MXSat, May 27, 3:27 AM PDT · 17660 days ago · 6 km deep · 81 km away
45. 2.526km WSW of Westmorland, CASat, May 27, 5:25 PM PDT · 17659 days ago · 9 km deep · 33 km away
46. 1.53km E of Bombay Beach, CASat, May 27, 10:05 PM PDT · 17659 days ago · 5 km deep · 47 km away
47. 1.810km N of Borrego Springs, CASat, May 27, 10:47 PM PDT · 17659 days ago · 10 km deep · 88 km away
48. 2.215km W of Alberto Oviedo Mota, B.C., MXSun, May 28, 12:06 AM PDT · 17659 days ago · 6 km deep · 82 km away
49. 2.515km WNW of Alberto Oviedo Mota, B.C., MXSun, May 28, 9:34 AM PDT · 17659 days ago · 6 km deep · 79 km away
50. 2.120km WSW of Westmorland, CASun, May 28, 1:46 PM PDT · 17659 days ago · 4 km deep · 26 km away
51. 1.727km WSW of Westmorland, CASun, May 28, 2:20 PM PDT · 17659 days ago · 6 km deep · 33 km away
52. 1.710km NE of Ocotillo Wells, CASun, May 28, 2:32 PM PDT · 17659 days ago · 6 km deep · 57 km away
53. 1.813km NNW of Delta, B.C., MXMon, May 29, 5:32 AM PDT · 17658 days ago · 6 km deep · 61 km away
54. 2.512km W of Alberto Oviedo Mota, B.C., MXMon, May 29, 8:21 AM PDT · 17658 days ago · 6 km deep · 82 km away
55. 1.713km NNW of Borrego Springs, CAMon, May 29, 5:34 PM PDT · 17657 days ago · 10 km deep · 94 km away
56. 1.714km NNE of Borrego Springs, CAMon, May 29, 10:58 PM PDT · 17657 days ago · 10 km deep · 87 km away
57. 1.53km ENE of Ocotillo Wells, CATue, May 30, 1:55 AM PDT · 17657 days ago · 7 km deep · 57 km away
58. 1.514km NE of Borrego Springs, CATue, May 30, 4:44 AM PDT · 17657 days ago · 16 km deep · 79 km away
59. 1.812km NNE of Borrego Springs, CATue, May 30, 7:31 AM PDT · 17657 days ago · 14 km deep · 86 km away
60. 2.26km NNE of Guadalupe Victoria, B.C., MXTue, May 30, 9:52 AM PDT · 17657 days ago · 10 km deep · 81 km away

The first 60 of 193.

Before

1. 2.28km N of Borrego Springs, CASat, May 20, 4:23 PM PDT · 17666 days ago · 14 km deep · 89 km away
2. 2.24km SSW of Brawley, CASat, May 20, 2:48 PM PDT · 17667 days ago · 10 km deep · 1 km away
3. 1.73km SSW of Brawley, CASat, May 20, 2:44 PM PDT · 17667 days ago · 10 km deep · 1 km away
4. 2.43km SSW of Brawley, CASat, May 20, 2:40 PM PDT · 17667 days ago · 10 km deep · 1 km away
5. 2.812km WNW of Alberto Oviedo Mota, B.C., MXSat, May 20, 10:16 AM PDT · 17667 days ago · 10 km deep · 78 km away
6. 2.43km SSW of Brawley, CASat, May 20, 9:16 AM PDT · 17667 days ago · 10 km deep · 1 km away
7. 2.813km W of Alberto Oviedo Mota, B.C., MXFri, May 19, 9:58 PM PDT · 17667 days ago · 10 km deep · 83 km away
8. 2.021km SSW of Progreso, B.C., MXFri, May 19, 8:04 PM PDT · 17667 days ago · 10 km deep · 61 km away
9. 2.127km SSW of Ocotillo Wells, CAFri, May 19, 5:25 AM PDT · 17668 days ago · 6 km deep · 65 km away
10. 2.515km WNW of Imperial, CAThu, May 18, 3:39 PM PDT · 17668 days ago · 10 km deep · 16 km away
11. 1.95km NE of North Shore, CAThu, May 18, 9:16 AM PDT · 17669 days ago · 7 km deep · 77 km away
12. 1.75km NE of North Shore, CAThu, May 18, 9:15 AM PDT · 17669 days ago · 13 km deep · 75 km away
13. 1.74km E of Ocotillo Wells, CAThu, May 18, 6:13 AM PDT · 17669 days ago · 6 km deep · 56 km away
14. 1.813km WSW of Delta, B.C., MXWed, May 17, 6:10 PM PDT · 17669 days ago · 6 km deep · 75 km away
15. 2.31km WNW of Guadalupe Victoria, B.C., MXWed, May 17, 4:48 PM PDT · 17669 days ago · 0 km deep · 83 km away
16. 1.75km WSW of Pine Valley, CATue, May 16, 4:18 PM PDT · 17670 days ago · 6 km deep · 98 km away
17. 1.610km WNW of Calipatria, CATue, May 16, 8:57 AM PDT · 17671 days ago · 9 km deep · 24 km away
18. 1.711km SW of Delta, B.C., MXTue, May 16, 7:56 AM PDT · 17671 days ago · 10 km deep · 76 km away
19. 1.712km WNW of Alberto Oviedo Mota, B.C., MXMon, May 15, 4:43 PM PDT · 17671 days ago · 6 km deep · 80 km away
20. 2.010km W of Alberto Oviedo Mota, B.C., MXMon, May 15, 12:04 PM PDT · 17672 days ago · 6 km deep · 82 km away

From the USGS Earthquake Hazards Program and its partner networks, event ci3339556. Read Fri, Oct 2, 2026, 9:25 AM UTC.