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M2.1 earthquake 24 km S of Guánica, Puerto Rico

A magnitude 2.1 earthquake struck 24 km S of Guánica, Puerto Rico at 17:27 local time (21:27 UTC) on 1 Oct 2026, at a depth of 6 km, according to USGS.

Data: USGS · updated 2026-10-01 21:44 UTC · reviewed

Magnitude
2.1micro
duration magnitude (md)
Depth
6 km
Status
Reviewed
Origin time
2026-10-01 21:27:57 UTC
Local: 1 Oct 2026, 17:27:57 (America/Puerto Rico)
Epicentre
17.752° N, 66.939° W

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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. 9,22424 kmINot felt
YaucoPuerto Rico · pop. 20,29532 kmINot felt
PoncePuerto Rico · pop. 137,49144 kmINot felt
MayagüezPuerto Rico · pop. 73,07754 kmINot felt
AreciboPuerto Rico · pop. 87,75483 kmINot felt
San JuanPuerto Rico · pop. 418,140119 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000318 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941322 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 2 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 Survey2.1 md6 km17.75° N, 66.94° 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 21 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 6 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.1 releases about 32× the energy of M1.1, and its waves are about 10× taller on a seismogram. Energy: 21 kg of TNT vs 674 g of TNT.

Each square is the energy of one M1.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

23 later earthquakes within 30 km; the largest was M2.5 7 days ago. 19 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
18.642.38
19.072.216
27.412.17
27.421.47
39.451.97
42.282.016
52.372.15
53.782.58
55.321.916
55.882.28
58.672.29
78.872.114
80.832.14
92.451.312
130.822.56
172.061.914
174.052.215
180.162.37
194.881.98
223.561.47
226.711.55
230.872.09
242.501.913
  1. 2.55 km WSW of Guánica, Puerto Rico10-04 03:14
  2. 2.5Near Guánica, Puerto Rico10-07 08:16
  3. 2.34 km SW of Guánica, Puerto Rico10-09 09:37
  4. 2.35 km WSW of Guánica, Puerto Rico10-02 16:06
  5. 2.25 km SW of Guánica, Puerto Rico10-04 05:20
  6. 2.28 km SSE of Guánica, Puerto Rico10-09 03:30
  7. 2.24 km SSW of Guánica, Puerto Rico10-04 08:08
  8. 2.2Near Guánica, Puerto Rico10-02 16:32
  9. 2.112 km WSW of Guánica, Puerto Rico10-05 06:17
  10. 2.16 km SW of Guánica, Puerto Rico10-03 00:52
  11. 2.1Near Guánica, Puerto Rico10-05 04:20
  12. 2.15 km WNW of Guánica, Puerto Rico10-04 01:49
  13. 2.08 km ESE of Guánica, Puerto Rico10-03 15:45
  14. 2.0Near Guánica, Puerto Rico10-11 12:20
  15. 1.99 km SE of Lajas, Puerto Rico10-03 12:54
  16. 1.98 km ESE of Guánica, Puerto Rico10-04 04:47
  17. 1.99 km SW of Guánica, Puerto Rico10-09 01:31
  18. 1.9Near Guánica, Puerto Rico10-10 00:20
  19. 1.99 km W of Guánica, Puerto Rico10-11 23:57
  20. 1.56 km NNW of Guánica, Puerto Rico10-11 08:10
  21. 1.45 km WNW of Guánica, Puerto Rico10-03 00:52
  22. 1.44 km NW of Guánica, Puerto Rico10-11 05:01
  23. 1.38 km W of Guánica, Puerto Rico10-05 17:55

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Reports on SeismoAtlas

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Event id pr71535303. First recorded here 1 Oct 2026, 21:46:07 UTC. Solutions: USGS · PR (usgs:pr71535303). Cite as: SeismoAtlas, “M2.1 earthquake 24 km S of Guánica, Puerto Rico”, https://seismoatlas.com/earthquake/pr71535303-m2-1-earthquake-24-km-s-of-guanica-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71535303. SeismoAtlas is not an official warning service.