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M3.0 earthquake 5 km WSW of Guánica, Puerto Rico

A magnitude 3.0 earthquake struck 5 km WSW of Guánica, Puerto Rico at 16:32 local time (20:32 UTC) on 20 Sept 2026, at a depth of 8 km, according to USGS.

1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-20 20:54 UTC · reviewed

Magnitude
3.0micro
duration magnitude (md)
Depth
8 km
Status
Reviewed
Origin time
2026-09-20 20:32:36 UTC
Local: 20 Sept 2026, 16:32:36 (America/Puerto Rico)
Epicentre
17.957° N, 66.951° 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
GuánicaPuerto Rico · pop. 9,2245 kmIIIWeak
YaucoPuerto Rico · pop. 20,29513 kmIIWeak
MayagüezPuerto Rico · pop. 73,07734 kmINot felt
PoncePuerto Rico · pop. 137,49136 kmINot felt
AreciboPuerto Rico · pop. 87,75462 kmINot felt
San JuanPuerto Rico · pop. 418,140106 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. Likely felt out to about 13 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 Survey3.0 md8 km17.96° N, 66.95° 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 401 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 8 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.0 releases about 27× the energy of M2.0, and its waves are about 8.9× taller on a seismogram. Energy: 401 kg of TNT vs 15 kg of TNT.

Each square is the energy of one M2.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

35 later earthquakes within 30 km; the largest was M2.6 4 days ago. 29 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.102.57
27.972.111
28.512.215
32.552.017
41.211.811
42.192.17
43.221.87
46.802.28
52.522.18
54.692.27
56.392.117
57.722.57
68.481.78
69.732.314
72.312.18
72.392.37
74.732.08
78.981.99
94.722.112
96.822.68
97.722.46
99.762.37
109.742.09
112.472.17
135.962.49
141.142.18
151.032.16
153.551.27
153.562.08
153.571.27
153.882.37
174.841.77
179.092.27
188.592.017
194.782.37
  1. 2.67 km SW of Guánica, Puerto Rico09-24 21:21
  2. 2.55 km SW of Guánica, Puerto Rico09-23 06:15
  3. 2.54 km W of Guánica, Puerto Rico09-20 23:38
  4. 2.45 km WSW of Guánica, Puerto Rico09-24 22:16
  5. 2.44 km SE of Guánica, Puerto Rico09-26 12:30
  6. 2.3Near Guayanilla, Puerto Rico09-23 18:16
  7. 2.34 km W of Guánica, Puerto Rico09-25 00:18
  8. 2.34 km SW of Guánica, Puerto Rico09-23 20:55
  9. 2.35 km SW of Guánica, Puerto Rico09-27 06:25
  10. 2.35 km SW of Guánica, Puerto Rico09-28 23:19
  11. 2.23 km SW of Guánica, Puerto Rico09-22 19:20
  12. 2.24 km SW of Guayanilla, Puerto Rico09-22 01:03
  13. 2.24 km SW of Guánica, Puerto Rico09-23 03:13
  14. 2.2Near Guánica, Puerto Rico09-28 07:37
  15. 2.15 km W of Guánica, Puerto Rico09-22 14:44
  16. 2.13 km ESE of Yauco, Puerto Rico09-23 01:03
  17. 2.15 km ESE of Guayanilla, Puerto Rico09-23 04:55
  18. 2.15 km NNW of Guánica, Puerto Rico09-23 20:51
  19. 2.14 km WSW of Guánica, Puerto Rico09-25 13:01
  20. 2.17 km SSW of Guayanilla, Puerto Rico09-22 00:30
  21. 2.13 km W of Guánica, Puerto Rico09-26 17:40
  22. 2.16 km S of Yauco, Puerto Rico09-24 19:16
  23. 2.14 km WNW of Guánica, Puerto Rico09-27 03:34
  24. 2.05 km S of Yauco, Puerto Rico09-22 05:05
  25. 2.08 km SSW of Guánica, Puerto Rico09-27 06:06

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id pr71533593. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · PR (usgs:pr71533593). Cite as: SeismoAtlas, “M3.0 earthquake 5 km WSW of Guánica, Puerto Rico”, https://seismoatlas.com/earthquake/pr71533593-m3-0-earthquake-5-km-wsw-of-guanica-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71533593. SeismoAtlas is not an official warning service.