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M3.5 earthquake 139 km NNE of Luquillo, Puerto Rico

A magnitude 3.5 earthquake struck 139 km NNE of Luquillo, Puerto Rico at 06:59 local time (10:59 UTC) on 13 Sept 2026, at a depth of 16 km, according to USGS.

Data: USGS · updated 2026-09-13 11:31 UTC · reviewed

Magnitude
3.5minor
duration magnitude (md)
Depth
16 km
Status
Reviewed
Origin time
2026-09-13 10:59:51 UTC
Local: 13 Sept 2026, 06:59:51 (America/Puerto Rico)
Epicentre
19.557° N, 65.304° 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
LuquilloPuerto Rico · pop. 8,326139 kmINot felt
LoízaPuerto Rico · pop. 4,311139 kmINot felt
Charlotte AmalieSaint Thomas Island, U.S. Virgin Islands · pop. 20,000141 kmINot felt
FajardoPuerto Rico · pop. 32,124141 kmINot felt
San JuanPuerto Rico · pop. 418,140148 kmINot felt
CarolinaPuerto Rico · pop. 170,404148 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 22 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 Survey3.5 md16 km19.56° N, 65.30° W–Reviewed

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 3 t 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 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.5 releases about 35× the energy of M2.5, and its waves are about 11× taller on a seismogram. Energy: 3 t of TNT vs 85 kg of TNT.

Each square is the energy of one M2.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

3 later earthquakes within 30 km; the largest was M3.4 11 days ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.113.280
83.213.418
224.313.312
  1. 3.4118 km N of Charlotte Amalie, Saint Thomas Island, U.S. Virgin Islands09-16 22:12
  2. 3.3135 km NNE of Loíza, Puerto Rico09-22 19:18
  3. 3.2124 km N of Culebra, Puerto Rico09-13 14:06

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 pr2026256003. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · PR (usgs:pr2026256003). Cite as: SeismoAtlas, “M3.5 earthquake 139 km NNE of Luquillo, Puerto Rico”, https://seismoatlas.com/earthquake/pr2026256003-m3-5-earthquake-139-km-nne-of-luquillo-puerto-rico, data from USGS.

JSON: /api/v1/events/pr2026256003. SeismoAtlas is not an official warning service.