QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 12:55 am AST (04:55 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 2.5 earthquake was recorded 13 km (8 mi) northwest of Aguadilla, PR, at 7:32 pm AST on 8 August 2018 (23:32 UTC), 10 km deep.

USGS: 12 km NW of Aguadilla, Puerto Rico

36 km (22 mi) NNW of Mayagüez, PR · 123 km (77 mi) W of San Juan, PR

7:32 pm AST, Aug 8, 2018 · · 10 km deep · released about 150 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 10 kmAguada Municipio 16 kmRincón Municipio 20 kmMoca Municipio 22 kmIsabela Municipio 23 kmAñasco Municipio 27 kmQuebradillas Municipio 32 kmSan Sebastián Municipio 34 kmCamuy Municipio 39 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
7:32 pm AST on 8 August 2018 ()
Where
13 km (8 mi) northwest of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 2.5 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 10 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3017 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Aguadilla, 13 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.

Likely felt in: Aguadilla 13 km, intensity II · Aguada 16 km, intensity II · Rafael Hernandez 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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 580 times the energy of this one.

Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 45 km NNE of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 21 km N of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 20 km NW of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 8 km S of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 4 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 18.5163, -67.2271. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 10 km (6 mi) ESE earthquakes near Aguadilla Municipio
Aguada Municipio, PR 16 km (10 mi) SSE earthquakes near Aguada Municipio
Rincón Municipio, PR 20 km (12 mi) S earthquakes near Rincón Municipio
Moca Municipio, PR 22 km (14 mi) SE earthquakes near Moca Municipio
Isabela Municipio, PR 23 km (14 mi) E earthquakes near Isabela Municipio
Añasco Municipio, PR 27 km (17 mi) SSE earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 2.5 4 km E of Isabela, Puerto Rico
  2. 2.7 10 km NNE of Isabela, Puerto Rico
  3. 2.1 3 km WSW of Maricao, Puerto Rico
  4. 2.1 5 km WNW of Maricao, Puerto Rico
  5. 2.6 8 km W of Rincón, Puerto Rico
  6. 2.4 20 km WNW of Puerto Real, Puerto Rico
  7. 2.7 36 km WSW of Stella, Puerto Rico
  8. 2.3 38 km NW of San Antonio, Puerto Rico
  9. 2.7 26 km NNW of Isabela, Puerto Rico
  10. 2.5 50 km NW of San Antonio, Puerto Rico
  11. 2.5 5 km N of Puerto Real, Puerto Rico
  12. 2.0 10 km WNW of Rincón, Puerto Rico
  13. 2.4 39 km NW of San Antonio, Puerto Rico
  14. 2.6 21 km W of Rincón, Puerto Rico
  15. 2.8 43 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.