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M2.1 earthquake 6 km SW of Guánica, Puerto Rico

A magnitude 2.1 earthquake struck 6 km SW of Guánica, Puerto Rico at 20:52 local time (00:52 UTC) on 2 Oct 2026, at a depth of 7 km, according to USGS.

Data: USGS · updated 2026-10-03 01:14 UTC · reviewed

Magnitude
2.1micro
duration magnitude (md)
Depth
7.3 km
Status
Reviewed
Origin time
2026-10-03 00:52:37 UTC
Local: 2 Oct 2026, 20:52:37 (America/Puerto Rico)
Epicentre
17.939° N, 66.958° 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. 9,2246 kmIIWeak
YaucoPuerto Rico · pop. 20,29515 kmINot felt
MayagüezPuerto Rico · pop. 73,07735 kmINot felt
PoncePuerto Rico · pop. 137,49137 kmINot felt
AreciboPuerto Rico · pop. 87,75464 kmINot felt
San JuanPuerto Rico · pop. 418,140107 kmINot felt
Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000312 kmINot felt
Santo DomingoNacional, Dominican Republic · pop. 2,201,941315 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 Survey2.1 md7.3 km17.94° N, 66.96° 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 7 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

24 later earthquakes within 30 km; the largest was M2.5 7 days ago. 22 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.011.47
12.041.97
14.872.016
24.962.15
26.372.58
27.911.916
28.472.28
31.262.29
37.742.114
51.462.114
53.422.14
65.041.312
66.481.88
103.402.56
119.182.116
144.651.914
146.642.215
152.552.314
152.752.37
167.471.98
196.141.47
199.301.55
203.462.09
215.081.913
  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. 2.311 km SW of Lajas, Puerto Rico10-09 09:25
  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. 2.1Near Guayanilla, Puerto Rico10-04 14:36
  9. 2.112 km WSW of Guánica, Puerto Rico10-05 06:17
  10. 2.1Near Guánica, Puerto Rico10-05 04:20
  11. 2.15 km WNW of Guánica, Puerto Rico10-04 01:49
  12. 2.15 km WNW of Yauco, Puerto Rico10-08 00:03
  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. 1.86 km SE of Sabana Grande, Puerto Rico10-05 19:21
  21. 1.56 km NNW of Guánica, Puerto Rico10-11 08:10
  22. 1.45 km WNW of Guánica, Puerto Rico10-03 00:52
  23. 1.44 km NW of Guánica, Puerto Rico10-11 05:01
  24. 1.38 km W of Guánica, Puerto Rico10-05 17:55

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Event id pr71535433. First recorded here 3 Oct 2026, 01:15:47 UTC. Solutions: USGS · PR (usgs:pr71535433). Cite as: SeismoAtlas, “M2.1 earthquake 6 km SW of Guánica, Puerto Rico”, https://seismoatlas.com/earthquake/pr71535433-m2-1-earthquake-6-km-sw-of-guanica-puerto-rico, data from USGS.

JSON: /api/v1/events/pr71535433. SeismoAtlas is not an official warning service.