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M2.9 earthquake near Guayanilla, Puerto Rico

A magnitude 2.9 earthquake struck near Guayanilla, Puerto Rico at 20:42 local time (00:42 UTC) on 30 Aug 2026, at a depth of 17 km, according to USGS.

Data: USGS · updated 2026-08-31 01:57 UTC · reviewed

Magnitude
2.9micro
duration magnitude (md)
Depth
16.7 km
Status
Reviewed
Origin time
2026-08-31 00:42:28 UTC
Local: 30 Aug 2026, 20:42:28 (America/Puerto Rico)
Epicentre
18.013° N, 66.809° 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. 5,2132 kmIIWeak
YaucoPuerto Rico · pop. 20,2955 kmIIWeak
PoncePuerto Rico · pop. 137,49120 kmIIWeak
MayagüezPuerto Rico · pop. 73,07741 kmINot felt
AreciboPuerto Rico · pop. 87,75452 kmINot felt
San JuanPuerto Rico · pop. 418,14090 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.

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 md16.7 km18.01° N, 66.81° 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 315 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 17 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 30× the energy of M1.9, and its waves are about 9.5× taller on a seismogram. Energy: 315 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

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

Aftershocks

Mainshock M2.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
28.182.512
52.012.913
106.262.910
121.562.720
122.542.610
297.172.614
331.902.58
340.672.511
365.662.913
415.233.012
435.352.56
437.992.620
444.624.87
444.672.58
444.882.910
445.432.68
445.522.59
448.242.68
448.262.78
448.643.46
449.682.88
449.702.56
450.712.76
450.773.07
452.982.58
453.552.57
453.762.67
458.492.59
458.522.513
458.852.57
460.113.07
460.413.18
460.813.18
462.323.014
471.812.88
478.072.69
479.522.57
487.183.014
499.843.08
502.942.57
527.812.111
528.342.215
530.791.415
532.382.017
532.412.115
541.051.811
542.032.17
543.061.87
546.642.28
552.362.18
554.522.27
556.222.117
557.552.57
568.321.78
569.572.314
572.142.18
572.222.37
574.572.08
578.821.99
594.562.112
596.652.68
596.842.118
597.562.46
599.592.37
609.572.09
612.312.17
635.802.49
640.972.18
650.862.16
653.391.27
653.392.08
653.401.27
653.722.37
663.311.814
674.671.77
678.922.27
688.422.017
694.622.37
698.182.313
699.581.98
  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. 2.95 km SW of Guayanilla, Puerto Rico09-02 04:42
  14. 2.99 km W of Guánica, Puerto Rico09-15 06:21
  15. 2.84 km WSW of Guánica, Puerto Rico09-18 18:23
  16. 2.8Near Guánica, Puerto Rico09-19 16:31
  17. 2.75 km W of Guánica, Puerto Rico09-18 19:24
  18. 2.76 km WSW of Guánica, Puerto Rico09-18 16:57
  19. 2.74 km ENE of Sabana Grande, Puerto Rico09-05 02:16
  20. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  21. 2.66 km WSW of Villalba, Puerto Rico09-18 06:41
  22. 2.63 km SW of Guánica, Puerto Rico09-18 14:08
  23. 2.65 km SW of Guánica, Puerto Rico09-19 22:46
  24. 2.65 km SSW of Guayanilla, Puerto Rico09-12 09:52
  25. 2.65 km WSW of Guánica, Puerto Rico09-18 22:28

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 pr71530403. First recorded here 28 Sept 2026, 17:32:14 UTC. Solutions: USGS · PR (usgs:pr71530403). Cite as: SeismoAtlas, “M2.9 earthquake near Guayanilla, Puerto Rico”, https://seismoatlas.com/earthquake/pr71530403-m2-9-earthquake-near-guayanilla-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71530403. SeismoAtlas is not an official warning service.