QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 10:49 am AST (14:49 UTC). The last one was M 3.5, 4 km (3 mi) SE, at 12:03 am AST on 6 November 2026, estimated intensity II (weak) in town. Every earthquake near Aguadilla

This page: a magnitude 3.1 earthquake was recorded 50 km (31 mi) north-northwest of Aguadilla, PR, at 8:17 pm AST on 28 August 2026 (00:17 UTC), 7.8 km deep.

USGS: 47 km NW of San Antonio, Puerto Rico

8:17 pm AST, Aug 28, 2026 · · 7.8 km deep · released about 1,200 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 45 kmAguada Municipio 54 kmIsabela Municipio 54 kmRincón Municipio 55 kmMoca Municipio 59 kmQuebradillas Municipio 62 kmAñasco Municipio 65 kmCamuy Municipio 69 kmSan Sebastián Municipio 70 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
8:17 pm AST on 28 August 2026 ()
Where
50 km (31 mi) north-northwest of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 3.1 (md)
Depth
7.8 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 45 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 75 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 39 km (24 mi) from the epicentre. In Aguadilla, 50 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 6.0 on 2019-09-24 — about 26,000 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 30 km ENE of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 24 km ESE of this epicentre
  3. 6.8 94 km NE of Punta Cana, Dominican Republic · 49 km NW of this epicentre
  4. 6.4 32 km NW of Aguadilla, Puerto Rico · 23 km S of this epicentre
  5. 6.3 6 km WNW of Aguadilla, Puerto Rico · 46 km SSE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 18.8193, -67.3840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 45 km (28 mi) SE earthquakes near Aguadilla Municipio
Aguada Municipio, PR 54 km (33 mi) SSE earthquakes near Aguada Municipio
Isabela Municipio, PR 54 km (34 mi) SE earthquakes near Isabela Municipio
Rincón Municipio, PR 55 km (34 mi) SSE earthquakes near Rincón Municipio
Moca Municipio, PR 59 km (36 mi) SSE earthquakes near Moca Municipio
Quebradillas Municipio, PR 62 km (39 mi) SE earthquakes near Quebradillas Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

29 earthquakes have been recorded within 50 km since this one.

  1. 2.9 47 km NNW of San Antonio, Puerto Rico
  2. 3.5 59 km NW of San Antonio, Puerto Rico
  3. 3.2 70 km NNW of San Antonio, Puerto Rico
  4. 2.4 6 km N of San Antonio, Puerto Rico
  5. 3.0 40 km NW of San Antonio, Puerto Rico
  6. 3.0 32 km NW of San Antonio, Puerto Rico
  7. 3.0 45 km NNW of San Antonio, Puerto Rico
  8. 3.4 31 km N of Isabela, Puerto Rico
  9. 3.2 57 km NW of San Antonio, Puerto Rico
  10. 3.2 77 km ENE of Punta Cana, Dominican Republic
  11. 3.1 57 km NW of San Antonio, Puerto Rico
  12. 2.8 7 km NNE of Isabela, Puerto Rico
  13. 3.0 70 km NW of San Antonio, Puerto Rico
  14. 2.9 37 km NW of San Antonio, Puerto Rico
  15. 3.0 63 km NW of San Antonio, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.