M3.5 earthquake 29km S of Progreso, B.C., MX

Magnitude

3.5 (ML, local (Richter)), minor

Magnitude from

Southern California Seismic Network

Local time

Mon, Aug 20, 1973, 6:39 AM PDT

UTC

1973-08-20 13:39:20 UTC

Depth

6.0 km (3.7 mi), shallow

Epicenter

32.322° N, 115.584° W

Region

Mexico

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 3.9 km horizontally, 31.6 km in depth

Magnitude uncertainty

±0.06

Depth from

Operator assigned

Station coverage gap

220°, poorly surrounded by stations

Stations used

15

• Santa Isabel, MexicoPopulation 29,311. Forecast34 kmS
• Mexicali, MexicoPopulation 1,032,686. Forecast36 kmSSW

After

1. 2.932km S of Progreso, B.C., MXMon, Aug 20, 7:27 AM PDT · 19400 days ago · 6 km deep · 3 km away
2. 2.724km S of Progreso, B.C., MXMon, Aug 20, 8:43 AM PDT · 19400 days ago · 6 km deep · 5 km away
3. 2.85km NNE of Westmorland, CAThu, Aug 23, 10:20 AM PDT · 19397 days ago · 6 km deep · 85 km away
4. 2.710km N of Westmorland, CAMon, Aug 27, 12:39 AM PDT · 19393 days ago · 6 km deep · 89 km away
5. 2.711km W of Calipatria, CAMon, Aug 27, 6:01 AM PDT · 19393 days ago · 6 km deep · 91 km away
6. 3.04km NW of Brawley, CAThu, Aug 30, 8:59 AM PDT · 19390 days ago · 6 km deep · 76 km away
7. 2.82km WNW of Brawley, CAThu, Aug 30, 10:50 AM PDT · 19390 days ago · 6 km deep · 74 km away
8. 2.22km S of Brawley, CAThu, Aug 30, 11:19 AM PDT · 19390 days ago · 5 km deep · 72 km away
9. 3.14km SSW of Brawley, CAThu, Aug 30, 11:42 AM PDT · 19390 days ago · 6 km deep · 70 km away
10. 3.33km W of Brawley, CAThu, Aug 30, 11:49 AM PDT · 19390 days ago · 6 km deep · 74 km away
11. 3.14km W of Brawley, CAThu, Aug 30, 12:17 PM PDT · 19389 days ago · 6 km deep · 73 km away
12. 1.61km SW of Brawley, CAThu, Aug 30, 12:22 PM PDT · 19389 days ago · 5 km deep · 72 km away
13. 2.93km WNW of Brawley, CAThu, Aug 30, 12:38 PM PDT · 19389 days ago · 6 km deep · 74 km away
14. 3.02km WNW of Brawley, CAThu, Aug 30, 1:13 PM PDT · 19389 days ago · 6 km deep · 74 km away
15. 3.04km NW of Brawley, CAThu, Aug 30, 2:17 PM PDT · 19389 days ago · 6 km deep · 76 km away
16. 1.80km SW of Brawley, CAThu, Aug 30, 3:02 PM PDT · 19389 days ago · 5 km deep · 73 km away
17. 1.51km S of Brawley, CAThu, Aug 30, 4:23 PM PDT · 19389 days ago · 11 km deep · 72 km away
18. 2.511km NNW of Campo, CAThu, Aug 30, 5:38 PM PDT · 19389 days ago · 8 km deep · 97 km away
19. 2.54km S of Brawley, CAThu, Aug 30, 9:18 PM PDT · 19389 days ago · 8 km deep · 69 km away
20. 2.41km SSE of Brawley, CAThu, Aug 30, 9:45 PM PDT · 19389 days ago · 5 km deep · 72 km away
21. 2.63km WNW of Brawley, CAThu, Aug 30, 10:42 PM PDT · 19389 days ago · 6 km deep · 74 km away
22. 2.23km SW of Brawley, CAFri, Aug 31, 6:06 PM PDT · 19388 days ago · 6 km deep · 71 km away
23. 2.36km NNE of Imperial, CAFri, Aug 31, 6:21 PM PDT · 19388 days ago · 6 km deep · 63 km away
24. 2.54km W of Brawley, CAFri, Aug 31, 6:23 PM PDT · 19388 days ago · 6 km deep · 72 km away
25. 2.59km WNW of Holtville, CASun, Sep 2, 10:40 AM PDT · 19387 days ago · 6 km deep · 59 km away
26. 2.25km SSW of Holtville, CASun, Sep 2, 10:43 AM PDT · 19387 days ago · 6 km deep · 53 km away
27. 2.96km W of Holtville, CASun, Sep 2, 10:53 AM PDT · 19387 days ago · 6 km deep · 56 km away
28. 2.58km W of Calipatria, CAThu, Sep 6, 10:55 PM PDT · 19382 days ago · 2 km deep · 89 km away
29. 2.623km WNW of Ocotillo, CASat, Sep 8, 6:38 AM PDT · 19381 days ago · 8 km deep · 81 km away
30. 2.929km S of Progreso, B.C., MXSat, Sep 8, 9:54 AM PDT · 19381 days ago · 6 km deep · 0 km away
31. 4.728km NW of Ocotillo, CAThu, Sep 13, 10:30 AM PDT · 19376 days ago · 9 km deep · 88 km away
32. 2.526km ENE of Pine Valley, CAThu, Sep 13, 10:40 AM PDT · 19376 days ago · 3 km deep · 90 km away
33. 3.028km ENE of Pine Valley, CAThu, Sep 13, 3:48 PM PDT · 19375 days ago · 9 km deep · 90 km away
34. 2.612km SSE of Pine Valley, CAThu, Sep 13, 5:28 PM PDT · 19375 days ago · 7 km deep · 96 km away
35. 3.226km ENE of Pine Valley, CAThu, Sep 13, 10:24 PM PDT · 19375 days ago · 8 km deep · 89 km away
36. 2.824km ENE of Pine Valley, CAThu, Sep 13, 10:56 PM PDT · 19375 days ago · 11 km deep · 90 km away
37. 2.526km ENE of Pine Valley, CAFri, Sep 14, 12:04 AM PDT · 19375 days ago · 10 km deep · 91 km away
38. 3.540km SSW of Progreso, B.C., MXFri, Sep 14, 4:57 PM PDT · 19374 days ago · 6 km deep · 19 km away
39. 3.012km ESE of Puebla, B.C., MXSat, Sep 15, 8:00 PM PDT · 19373 days ago · 6 km deep · 38 km away
40. 3.316km SW of Westmorland, CASat, Sep 15, 11:58 PM PDT · 19373 days ago · 6 km deep · 68 km away
41. 2.28km SW of Westmorland, CASun, Sep 16, 12:14 AM PDT · 19373 days ago · 5 km deep · 75 km away
42. 1.77km WSW of Ocotillo, CASat, Sep 22, 9:46 AM PDT · 19367 days ago · 10 km deep · 64 km away
43. 3.066km E of Maneadero, B.C., MXWed, Sep 26, 12:16 AM PDT · 19363 days ago · 6 km deep · 74 km away
44. 2.810km E of Puebla, B.C., MXThu, Sep 27, 5:54 AM PDT · 19362 days ago · 10 km deep · 42 km away
45. 1.56km E of Westmorland, CASat, Sep 29, 7:20 AM PDT · 19360 days ago · 5 km deep · 78 km away
46. 2.612km N of Campo, CATue, Oct 2, 5:52 PM PDT · 19356 days ago · 6 km deep · 94 km away
47. 1.98km NE of Imperial, CATue, Oct 2, 8:41 PM PDT · 19356 days ago · 4 km deep · 63 km away
48. 1.93km NNW of El Centro, CASun, Oct 7, 1:10 AM PDT · 19352 days ago · 5 km deep · 54 km away
49. 1.71km N of El Centro, CASun, Oct 7, 2:37 AM PDT · 19352 days ago · 5 km deep · 53 km away
50. 2.29km SSW of Holtville, CAFri, Oct 12, 6:15 AM PDT · 19347 days ago · 6 km deep · 49 km away
51. 2.516km N of Delta, B.C., MXFri, Oct 12, 9:52 PM PDT · 19346 days ago · 4 km deep · 41 km away
52. 1.73km S of Brawley, CASat, Oct 13, 12:20 AM PDT · 19346 days ago · 5 km deep · 71 km away
53. 2.832km E of Ensenada, B.C., MXSun, Oct 14, 2:33 AM PDT · 19345 days ago · 6 km deep · 81 km away
54. 4.368km E of Maneadero, B.C., MXTue, Oct 16, 7:53 AM PDT · 19343 days ago · 6 km deep · 65 km away
55. 3.271km E of Maneadero, B.C., MXTue, Oct 16, 8:00 AM PDT · 19343 days ago · 6 km deep · 71 km away
56. 3.060km E of Maneadero, B.C., MXTue, Oct 16, 8:56 AM PDT · 19343 days ago · 6 km deep · 71 km away
57. 3.071km ENE of Maneadero, B.C., MXTue, Oct 16, 11:25 AM PDT · 19343 days ago · 6 km deep · 50 km away
58. 3.010km WSW of Puebla, B.C., MXWed, Oct 17, 4:16 AM PDT · 19342 days ago · 5 km deep · 25 km away

Before

1. 2.52km N of Brawley, CAMon, Aug 20, 3:04 AM PDT · 19400 days ago · 5 km deep · 75 km away
2. 2.68km N of Westmorland, CAFri, Aug 17, 10:41 PM PDT · 19402 days ago · 0 km deep · 87 km away
3. 2.79km NNW of Campo, CAThu, Aug 16, 5:22 PM PDT · 19403 days ago · 11 km deep · 96 km away
4. 1.69km WNW of Calipatria, CAWed, Aug 15, 11:29 AM PDT · 19405 days ago · 5 km deep · 94 km away
5. 2.15km SE of Campo, CATue, Aug 14, 11:38 PM PDT · 19405 days ago · 0 km deep · 84 km away
6. 2.721km ENE of Ensenada, B.C., MXTue, Aug 14, 11:37 PM PDT · 19405 days ago · 6 km deep · 89 km away
7. 1.623km WSW of Westmorland, CAMon, Aug 13, 11:19 PM PDT · 19406 days ago · 9 km deep · 74 km away
8. 2.623km SW of Westmorland, CASun, Aug 12, 6:33 AM PDT · 19408 days ago · 10 km deep · 68 km away
9. 1.67km WSW of Holtville, CASat, Aug 11, 3:33 AM PDT · 19409 days ago · 10 km deep · 52 km away
10. 2.912km N of Campo, CAThu, Aug 9, 5:49 PM PDT · 19410 days ago · 10 km deep · 95 km away
11. 1.913km WNW of Calipatria, CAWed, Aug 8, 8:01 PM PDT · 19411 days ago · 4 km deep · 94 km away
12. 2.859km E of Maneadero, B.C., MXMon, Aug 6, 8:58 AM PDT · 19414 days ago · 6 km deep · 72 km away
13. 1.78km NW of Delta, B.C., MXSat, Aug 4, 7:07 PM PDT · 19415 days ago · 5 km deep · 34 km away
14. 1.618km N of Tecolots, B.C., MXThu, Aug 2, 9:20 AM MST · 19418 days ago · 5 km deep · 73 km away
15. 2.54km WSW of El Centro, CAThu, Jul 26, 6:22 PM PDT · 19424 days ago · 8 km deep · 51 km away
16. 2.712km SSE of Pine Valley, CAThu, Jul 26, 5:23 PM PDT · 19424 days ago · 10 km deep · 96 km away
17. 4.381km SSW of Alberto Oviedo Mota, B.C., MXSat, Jul 21, 11:39 PM PDT · 19429 days ago · 6 km deep · 87 km away
18. 3.042km SSW of Progreso, B.C., MXSat, Jul 21, 6:36 PM PDT · 19429 days ago · 6 km deep · 18 km away

From the USGS Earthquake Hazards Program and its partner networks, event ci3319428. Read Thu, Oct 1, 2026, 6:27 AM UTC.