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M2.7 earthquake 4 km ENE of Sabana Grande, Puerto Rico

A magnitude 2.7 earthquake struck 4 km ENE of Sabana Grande, Puerto Rico at 22:16 local time (02:16 UTC) on 4 Sept 2026, at a depth of 20 km, according to USGS.

Data: USGS · updated 2026-09-05 03:00 UTC · reviewed

Magnitude
2.7micro
duration magnitude (md)
Depth
20.3 km
Status
Reviewed
Origin time
2026-09-05 02:16:18 UTC
Local: 4 Sept 2026, 22:16:18 (America/Puerto Rico)
Epicentre
18.093° N, 66.928° 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
Sabana GrandePuerto Rico · pop. 8,9614 kmIIWeak
YaucoPuerto Rico · pop. 20,29511 kmIIWeak
MayagüezPuerto Rico · pop. 73,07725 kmINot felt
PoncePuerto Rico · pop. 137,49134 kmINot felt
AreciboPuerto Rico · pop. 87,75447 kmINot felt
San JuanPuerto Rico · pop. 418,14096 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000312 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941316 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.

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 Survey2.7 md20.3 km18.09° N, 66.93° W–Reviewed

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How big was it?

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

It released roughly the energy of 153 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 20 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.7 releases about 29× the energy of M1.7, and its waves are about 9.3× taller on a seismogram. Energy: 153 kg of TNT vs 5 kg of TNT.

Each square is the energy of one M1.7. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

67 later earthquakes within 30 km; the largest was M4.8 10 days ago. 5 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.982.610
53.863.2122
175.602.614
210.342.58
244.092.913
293.673.012
313.792.56
323.054.87
323.112.58
323.322.910
323.872.68
323.952.59
326.682.68
326.692.78
327.073.46
328.122.88
328.132.56
329.142.76
329.203.07
331.422.58
331.992.57
332.202.67
336.932.59
336.962.513
337.292.57
338.553.07
338.843.18
339.253.18
350.252.88
356.512.69
357.962.57
378.273.08
381.372.57
406.242.111
406.782.215
410.822.017
419.481.811
420.462.17
421.491.87
425.082.28
430.792.18
432.962.27
434.662.117
435.992.57
446.751.78
448.002.314
450.582.18
450.662.37
453.002.08
457.251.99
473.002.112
475.092.68
476.002.46
478.032.37
488.012.09
490.752.17
514.232.49
519.412.18
529.302.16
531.821.27
531.832.08
531.841.27
532.152.37
553.111.77
557.362.27
566.862.017
573.052.37
  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. 3.28 km WNW of Maricao, Puerto Rico09-07 08:08
  4. 3.15 km SW of Guánica, Puerto Rico09-19 05:06
  5. 3.15 km W of Guánica, Puerto Rico09-19 05:31
  6. 3.03 km SW of Guayanilla, Puerto Rico09-17 07:56
  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. 3.05 km WSW of Guánica, Puerto Rico09-20 20:32
  10. 2.95 km SW of Guánica, Puerto Rico09-18 13:35
  11. 2.99 km W of Guánica, Puerto Rico09-15 06:21
  12. 2.84 km WSW of Guánica, Puerto Rico09-18 18:23
  13. 2.8Near Guánica, Puerto Rico09-19 16:31
  14. 2.75 km W of Guánica, Puerto Rico09-18 19:24
  15. 2.76 km WSW of Guánica, Puerto Rico09-18 16:57
  16. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  17. 2.63 km SW of Guánica, Puerto Rico09-18 14:08
  18. 2.65 km SW of Guánica, Puerto Rico09-19 22:46
  19. 2.65 km SSW of Guayanilla, Puerto Rico09-12 09:52
  20. 2.65 km WSW of Guánica, Puerto Rico09-18 22:28
  21. 2.66 km SW of Guánica, Puerto Rico09-05 03:14
  22. 2.64 km W of Guánica, Puerto Rico09-18 16:57
  23. 2.5Near Guánica, Puerto Rico09-18 21:41
  24. 2.5Near Guánica, Puerto Rico09-18 14:13
  25. 2.55 km SSW of Guánica, Puerto Rico09-18 18:24

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 pr71530908. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · PR (usgs:pr71530908). Cite as: SeismoAtlas, “M2.7 earthquake 4 km ENE of Sabana Grande, Puerto Rico”, https://seismoatlas.com/earthquake/pr71530908-m2-7-earthquake-4-km-ene-of-sabana-grande-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71530908. SeismoAtlas is not an official warning service.