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

A magnitude 2.9 earthquake struck 5 km SE of Guayanilla, Puerto Rico at 06:58 local time (10:58 UTC) on 4 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-04 13:29 UTC · reviewed

Magnitude
2.9micro
duration magnitude (md)
Depth
10.3 km
Status
Reviewed
Origin time
2026-09-04 10:58:08 UTC
Local: 4 Sept 2026, 06:58:08 (America/Puerto Rico)
Epicentre
17.989° N, 66.755° 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
PeñuelasPuerto Rico · pop. 6,8479 kmIIIWeak
YaucoPuerto Rico · pop. 20,29511 kmIIWeak
PoncePuerto Rico · pop. 137,49115 kmIIWeak
MayagüezPuerto Rico · pop. 73,07747 kmINot felt
AreciboPuerto Rico · pop. 87,75454 kmINot felt
San JuanPuerto Rico · pop. 418,14087 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000332 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 11 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 md10.3 km17.99° N, 66.76° W–Reviewed

How big was it?

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

It released roughly the energy of 388 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 10 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 36× the energy of M1.9, and its waves are about 11× taller on a seismogram. Energy: 388 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

73 later earthquakes within 30 km; the largest was M4.8 10 days ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
15.302.720
16.282.610
190.912.614
234.412.511
259.392.913
308.973.012
329.092.56
331.732.620
338.364.87
338.412.58
338.622.910
339.172.68
339.262.59
341.982.68
342.002.78
342.383.46
343.422.88
343.442.56
344.442.76
344.513.07
346.722.58
347.292.57
347.502.67
352.232.59
352.262.513
352.592.57
353.853.07
354.153.18
354.553.18
356.063.014
365.552.88
371.812.69
373.262.57
380.923.014
393.573.08
396.682.57
421.542.111
422.082.215
424.531.415
426.122.017
426.152.115
434.791.811
435.772.17
436.801.87
440.382.28
446.092.18
448.262.27
449.962.117
451.292.57
462.061.78
463.312.314
465.882.18
465.962.37
468.312.08
472.551.99
488.302.112
490.392.68
490.572.118
491.302.46
493.332.37
503.312.09
506.052.17
529.542.49
534.712.18
544.602.16
547.131.27
547.132.08
547.141.27
547.452.37
557.051.814
568.411.77
572.662.27
582.162.017
  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 SW of Guánica, Puerto Rico09-18 13:35
  12. 2.99 km W of Guánica, Puerto Rico09-15 06:21
  13. 2.84 km WSW of Guánica, Puerto Rico09-18 18:23
  14. 2.8Near Guánica, Puerto Rico09-19 16:31
  15. 2.75 km W of Guánica, Puerto Rico09-18 19:24
  16. 2.76 km WSW of Guánica, Puerto Rico09-18 16:57
  17. 2.74 km ENE of Sabana Grande, Puerto Rico09-05 02:16
  18. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  19. 2.66 km WSW of Villalba, Puerto Rico09-18 06:41
  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 pr71530873. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · PR (usgs:pr71530873). Cite as: SeismoAtlas, “M2.9 earthquake 5 km SE of Guayanilla, Puerto Rico”, https://seismoatlas.com/earthquake/pr71530873-m2-9-earthquake-5-km-se-of-guayanilla-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71530873. SeismoAtlas is not an official warning service.