M3.1 earthquake 8 km WNW of Barceloneta, Puerto Rico
A magnitude 3.1 earthquake struck 8 km WNW of Barceloneta, Puerto Rico at 17:00 local time (21:00 UTC) on 30 Sept 2026, at a depth of 105 km, according to USGS.
Data: USGS · updated 2026-09-30 21:28 UTC · reviewed
- Magnitude
- 3.1minor
duration magnitude (md) - Depth
- 105.4 km
- Status
- Reviewed
- Origin time
- 2026-09-30 21:00:48 UTC
- Local: 30 Sept 2026, 17:00:48 (America/Puerto Rico)
- Epicentre
- 18.478° N, 66.614° 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
| Place | Distance | Est. shaking |
|---|---|---|
| BarcelonetaPuerto Rico · pop. 22,322 | 8 km | INot felt |
| AreciboPuerto Rico · pop. 87,754 | 11 km | INot felt |
| Vega BajaPuerto Rico · pop. 29,325 | 24 km | INot felt |
| LevittownToa Baja, Puerto Rico · pop. 29,785 | 46 km | INot felt |
| San JuanPuerto Rico · pop. 418,140 | 53 km | INot felt |
| Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000 | 341 km | INot felt |
| Santo DomingoNacional, Dominican Republic · pop. 2,201,941 | 346 km | INot felt |
| Santo Domingo OesteSanto Domingo Province, Dominican Republic · pop. 701,269 | 357 km | INot 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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · PRheadlinePuerto Rico Seismic Network via U.S. Geological Survey | 3.1 md | 105.4 km | 18.48° N, 66.61° W | – | Reviewed |
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How big was it?
Often felt by people at rest close to the epicentre, rarely causes damage.
It released roughly the energy of 773 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 105 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.
M3.1 releases about 36× the energy of M2.1, and its waves are about 11× taller on a seismogram. Energy: 773 kg of TNT vs 21 kg of TNT.
Each square is the energy of one M2.1. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
No later earthquakes have been recorded within 30 km so far. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
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Event id pr71535213. First recorded here 30 Sept 2026, 21:29:01 UTC. Solutions: USGS · PR (usgs:pr71535213). Cite as: SeismoAtlas, “M3.1 earthquake 8 km WNW of Barceloneta, Puerto Rico”, https://seismoatlas.com/earthquake/pr71535213-m3-1-earthquake-8-km-wnw-of-barceloneta-puerto-rico, data from USGS.
JSON: /api/v1/events/pr71535213. SeismoAtlas is not an official warning service.