QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 11:32 am AST (15:32 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 2.1 earthquake was recorded 41 km (25 mi) north-northwest of Aguadilla, PR, at 7:25 am AST on 28 April 2018 (11:25 UTC), 12 km deep.

USGS: 38 km NW of San Antonio, Puerto Rico

7:25 am AST, Apr 28, 2018 · · 12 km deep · released about 49 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 37 kmAguada Municipio 44 kmRincón Municipio 46 kmIsabela Municipio 46 kmMoca Municipio 50 kmQuebradillas Municipio 55 kmAñasco Municipio 56 kmSan Sebastián Municipio 61 kmCamuy Municipio 62 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
7:25 am AST on 28 April 2018 ()
Where
41 km (25 mi) north-northwest of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 2.1 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 37 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3119 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 13 km (8 mi) from the epicentre. In Aguadilla, 41 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 4.4 on 2017-10-01 — about 2,500 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 · 31 km NE of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 18 km ESE of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 14 km S of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 37 km SSE of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 25 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 18.7401, -67.3581. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 37 km (23 mi) SE earthquakes near Aguadilla Municipio
Aguada Municipio, PR 44 km (28 mi) SSE earthquakes near Aguada Municipio
Rincón Municipio, PR 46 km (29 mi) SSE earthquakes near Rincón Municipio
Isabela Municipio, PR 46 km (29 mi) SE earthquakes near Isabela Municipio
Moca Municipio, PR 50 km (31 mi) SE earthquakes near Moca Municipio
Quebradillas Municipio, PR 55 km (34 mi) SE earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.9 9 km NW of Caban, Puerto Rico
  2. 2.3 6 km WNW of Rincón, Puerto Rico
  3. 2.8 Mona Passage
  4. 2.8 54 km NW of San Antonio, Puerto Rico
  5. 2.3 5 km NNW of Rincón, Puerto Rico
  6. 2.6 Mona Passage
  7. 3.0 2 km WSW of Stella, Puerto Rico
  8. 2.5 4 km NW of Rincón, Puerto Rico
  9. 3.0 63 km NNW of San Antonio, Puerto Rico
  10. 2.0 29 km NW of Rincón, Puerto Rico
  11. 2.7 74 km NW of San Antonio, Puerto Rico
  12. 2.0 Mona Passage
  13. 2.8 22 km W of Rincón, Puerto Rico
  14. 2.9 58 km NNW of San Antonio, Puerto Rico
  15. 3.4 69 km ENE of Punta Cana, Dominican Republic

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.