M4.8 earthquake 9 km WSW of Guaymate, La Romana, Dominican Republic
A magnitude 4.8 earthquake struck 9 km WSW of Guaymate, La Romana, Dominican Republic at 17:49 local time (21:49 UTC) on 27 Sept 2026, at a depth of 111 km, according to USGS and GFZ.
Reported by 2 agencies · revised from M4.7 · 238 reports to USGS “Did You Feel It?”
Data: USGS, GFZ · updated 2026-10-20 23:23 UTC · reviewed
- Magnitude
- 4.8light
moment magnitude (W phase) (mww)
revised from 4.7 - Depth
- 111.2 km
- Status
- Reviewed
- Origin time
- 2026-09-27 21:49:47 UTC
- Local: 27 Sept 2026, 17:49:47 (America/Santo Domingo)
- Epicentre
- 18.548° N, 69.050° W
Circles show this event and others within 32 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 |
|---|---|---|
| GuaymateLa Romana, Dominican Republic · pop. 6,224 | 9 km | IIWeak |
| La RomanaDominican Republic · pop. 208,437 | 17 km | IIWeak |
| Santa Cruz de El SeiboEl Seíbo, Dominican Republic · pop. 23,547 | 24 km | IIWeak |
| San Pedro de MacorísDominican Republic · pop. 217,899 | 29 km | IIWeak |
| Hato Mayor del ReyHato Mayor Province, Dominican Republic · pop. 35,999 | 33 km | IIWeak |
| Santo Domingo EsteSanto Domingo Province, Dominican Republic · pop. 700,000 | 85 km | IIWeak |
| Santo DomingoNacional, Dominican Republic · pop. 2,201,941 | 89 km | IIWeak |
| Santo Domingo OesteSanto Domingo Province, Dominican Republic · pop. 701,269 | 100 km | IIWeak |
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, which has been reviewed by an analyst.
How big was it?
Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.
It released roughly the energy of 239 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 111 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.
M4.8 releases about 32× the energy of M3.8, and its waves are about 10× taller on a seismogram. Energy: 239 t of TNT vs 7.6 t of TNT.
Each square is the energy of one M3.8. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
3 later earthquakes within 32 km; the largest was M3.9 7 days ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M4.8
3 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 27.94 | 3.4 | 115 |
| 341.16 | 3.6 | 117 |
| 378.09 | 3.9 | 117 |
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.
Event id gfz2026szdn. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: GFZ (geofon:gfz2026szdn); USGS (usgs:us6000ty0q). Cite as: SeismoAtlas, “M4.8 earthquake 9 km WSW of Guaymate, La Romana, Dominican Republic”, https://seismoatlas.com/earthquake/gfz2026szdn-m4-8-earthquake-9-km-wsw-of-guaymate-la-romana-dominican-republic, data from USGS, GFZ.
JSON: /api/v1/events/gfz2026szdn. SeismoAtlas is not an official warning service.