QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 7:53 pm AST (23:53 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 1.9 earthquake was recorded 2 km (2 mi) southeast of Aguadilla, PR, at 6:39 pm AST on 11 September 2018 (22:39 UTC), 25 km deep.

USGS: 2 km SE of Aguadilla, Puerto Rico

23 km (14 mi) N of Mayagüez, PR · 113 km (70 mi) W of San Juan, PR

6:39 pm AST, Sep 11, 2018 · · 25 km deep · released about 24 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguada Municipio 6 kmMoca Municipio 7 kmAguadilla Municipio 8 kmAñasco Municipio 14 kmRincón Municipio 14 kmIsabela Municipio 16 kmSan Sebastián Municipio 20 kmQuebradillas Municipio 23 kmLas Marías Municipio 27 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
6:39 pm AST on 11 September 2018 ()
Where
2 km (2 mi) southeast of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 1.9 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Aguada Municipio, 6 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2983 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Aguadilla, 2 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.

Earthquakes near other towns within 30 km: Moca, Caban, Luyando, Aguada, Aceitunas, Rafael Hernandez.

How big was it?

This earthquake released about 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 lb of TNT

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 4.3 on 2017-10-14 — about 3,600 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 33 km N of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 34 km NW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 9 km WNW of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 18 km NNW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 26 km N 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 18.4105, -67.1390. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguada Municipio, PR 6 km (4 mi) SW earthquakes near Aguada Municipio
Moca Municipio, PR 7 km (5 mi) ESE earthquakes near Moca Municipio
Aguadilla Municipio, PR 8 km (5 mi) N earthquakes near Aguadilla Municipio
Añasco Municipio, PR 14 km (9 mi) S earthquakes near Añasco Municipio
Rincón Municipio, PR 14 km (9 mi) SW earthquakes near Rincón Municipio
Isabela Municipio, PR 16 km (10 mi) ENE earthquakes near Isabela Municipio

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

Aftershocks so far

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

  1. 1.9 1 km SE of Lajas, Puerto Rico
  2. 1.5 3 km ENE of San Germán, Puerto Rico
  3. 2.1 2 km E of San Sebastián, Puerto Rico
  4. 2.3 15 km WSW of Puerto Real, Puerto Rico
  5. 2.4 10 km NW of Puerto Real, Puerto Rico
  6. 2.1 5 km NW of Puerto Real, Puerto Rico
  7. 2.3 6 km W of Boquerón, Puerto Rico
  8. 2.2 27 km WNW of Aguadilla, Puerto Rico
  9. 2.5 23 km NNW of Camuy, Puerto Rico
  10. 2.7 23 km N of Hatillo, Puerto Rico
  11. 2.1 5 km SE of Lajas, Puerto Rico
  12. 2.5 7 km E of Mayagüez, Puerto Rico
  13. 1.9 8 km NW of Santo Domingo, Puerto Rico
  14. 1.8 4 km NNE of Yauco, Puerto Rico
  15. 2.6 38 km NNW 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.