M3.4 earthquake 37 km WSW of Rincón, Puerto Rico
A magnitude 3.4 earthquake struck 37 km WSW of Rincón, Puerto Rico at 19:11 local time (23:11 UTC) on 29 Aug 2026, at a depth of 112 km, according to USGS.
Data: USGS · updated 2026-09-15 03:29 UTC · reviewed
- Magnitude
- 3.4minor
duration magnitude (md) - Depth
- 112.1 km
- Status
- Reviewed
- Origin time
- 2026-08-29 23:11:08 UTC
- Local: 29 Aug 2026, 19:11:08 (America/Puerto Rico)
- Epicentre
- 18.247° N, 67.587° 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
| Place | Distance | Est. shaking |
|---|---|---|
| RincónPuerto Rico · pop. 1,499 | 37 km | INot felt |
| AguadaPuerto Rico · pop. 4,040 | 44 km | INot felt |
| MayagüezPuerto Rico · pop. 73,077 | 48 km | INot felt |
| YaucoPuerto Rico · pop. 20,295 | 82 km | INot felt |
| Punta CanaLa Altagracia Province, Dominican Republic · pop. 100,023 | 93 km | INot felt |
| AreciboPuerto Rico · pop. 87,754 | 95 km | INot felt |
| San JuanPuerto Rico · pop. 418,140 | 158 km | INot felt |
| Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000 | 240 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 | 3.4 md | 112.1 km | 18.25° N, 67.59° 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 1.6 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 112 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.
M3.4 releases about 27× the energy of M2.4, and its waves are about 8.9× taller on a seismogram. Energy: 1.6 t of TNT vs 60 kg of TNT.
Each square is the energy of one M2.4. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
4 later earthquakes within 30 km; the largest was M3.4 10 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M3.4
4 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 45.44 | 3.0 | 8 |
| 162.25 | 2.7 | 15 |
| 410.98 | 2.9 | 8 |
| 460.89 | 3.4 | 116 |
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 pr71530283. First recorded here 28 Sept 2026, 17:32:14 UTC. Solutions: USGS · PR (usgs:pr71530283). Cite as: SeismoAtlas, “M3.4 earthquake 37 km WSW of Rincón, Puerto Rico”, https://seismoatlas.com/earthquake/pr71530283-m3-4-earthquake-37-km-wsw-of-rincon-puerto-rico, data from USGS.
JSON: /api/v1/events/pr71530283. SeismoAtlas is not an official warning service.