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M2.9 earthquake 5 km SW of Guayanilla, Puerto Rico

A magnitude 2.9 earthquake struck 5 km SW of Guayanilla, Puerto Rico at 00:42 local time (04:42 UTC) on 2 Sept 2026, at a depth of 13 km, according to USGS.

Data: USGS · updated 2026-09-02 05:37 UTC · reviewed

Magnitude
2.9micro
duration magnitude (md)
Depth
12.6 km
Status
Reviewed
Origin time
2026-09-02 04:42:46 UTC
Local: 2 Sept 2026, 00:42:46 (America/Puerto Rico)
Epicentre
17.986° N, 66.818° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
GuayanillaPuerto Rico · pop. 5,2135 kmIIIWeak
YaucoPuerto Rico · pop. 20,2956 kmIIIWeak
PoncePuerto Rico · pop. 137,49121 kmIIWeak
MayagüezPuerto Rico · pop. 73,07742 kmINot felt
AreciboPuerto Rico · pop. 87,75455 kmINot felt
San JuanPuerto Rico · pop. 418,14092 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000325 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941329 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 6 km.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · PR, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · PRheadlinePuerto Rico Seismic Network via U.S. Geological Survey2.9 md12.6 km17.99° N, 66.82° W–Reviewed

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 326 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 13 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.9 releases about 31× the energy of M1.9, and its waves are about 9.8× taller on a seismogram. Energy: 326 kg of TNT vs 11 kg of TNT.

Each square is the energy of one M1.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

74 later earthquakes within 30 km; the largest was M4.8 10 days ago. 2 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

74 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
54.262.910
69.562.720
70.542.610
245.162.614
279.902.58
288.672.511
313.652.913
363.233.012
383.352.56
392.614.87
392.672.58
392.882.910
393.432.68
393.512.59
396.242.68
396.252.78
396.633.46
397.682.88
397.692.56
398.702.76
398.763.07
400.972.58
401.552.57
401.762.67
406.492.59
406.512.513
406.852.57
408.113.07
408.403.18
408.813.18
410.323.014
419.812.88
426.072.69
427.522.57
435.173.014
447.833.08
450.932.57
475.802.111
476.342.215
478.791.415
480.382.017
480.412.115
489.041.811
490.022.17
491.051.87
494.642.28
500.352.18
502.522.27
504.222.117
505.552.57
516.311.78
517.562.314
520.142.18
520.222.37
522.562.08
526.811.99
542.552.112
544.652.68
544.832.118
545.562.46
547.592.37
557.572.09
560.302.17
583.792.49
588.972.18
598.862.16
601.381.27
601.392.08
601.401.27
601.712.37
611.311.814
622.671.77
626.922.27
636.422.017
  1. 4.85 km SW of Guánica, Puerto Rico09-18 13:19
  2. 3.45 km W of Guánica, Puerto Rico09-18 17:20
  3. 3.15 km SW of Guánica, Puerto Rico09-19 05:06
  4. 3.15 km W of Guánica, Puerto Rico09-19 05:31
  5. 3.03 km SW of Guayanilla, Puerto Rico09-17 07:56
  6. 3.07 km SSE of Ponce, Puerto Rico09-20 07:53
  7. 3.05 km WSW of Guánica, Puerto Rico09-18 19:28
  8. 3.04 km SW of Guánica, Puerto Rico09-19 04:49
  9. 3.07 km SSE of Ponce, Puerto Rico09-19 07:01
  10. 3.05 km WSW of Guánica, Puerto Rico09-20 20:32
  11. 2.95 km SE of Guayanilla, Puerto Rico09-04 10:58
  12. 2.95 km SW of Guánica, Puerto Rico09-18 13:35
  13. 2.99 km W of Guánica, Puerto Rico09-15 06:21
  14. 2.84 km WSW of Guánica, Puerto Rico09-18 18:23
  15. 2.8Near Guánica, Puerto Rico09-19 16:31
  16. 2.75 km W of Guánica, Puerto Rico09-18 19:24
  17. 2.76 km WSW of Guánica, Puerto Rico09-18 16:57
  18. 2.74 km ENE of Sabana Grande, Puerto Rico09-05 02:16
  19. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  20. 2.63 km SW of Guánica, Puerto Rico09-18 14:08
  21. 2.65 km SW of Guánica, Puerto Rico09-19 22:46
  22. 2.65 km SSW of Guayanilla, Puerto Rico09-12 09:52
  23. 2.65 km WSW of Guánica, Puerto Rico09-18 22:28
  24. 2.66 km SW of Guánica, Puerto Rico09-05 03:14
  25. 2.64 km W of Guánica, Puerto Rico09-18 16:57

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id pr71530593. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · PR (usgs:pr71530593). Cite as: SeismoAtlas, “M2.9 earthquake 5 km SW of Guayanilla, Puerto Rico”, https://seismoatlas.com/earthquake/pr71530593-m2-9-earthquake-5-km-sw-of-guayanilla-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71530593. SeismoAtlas is not an official warning service.