QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Aguadilla, PR

No earthquake was likely felt in Aguadilla in the 24 hours to 2:03 am AST (06:03 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 2.4 earthquake was recorded 46 km (29 mi) north-northwest of Aguadilla, PR, at 10:17 pm AST on 8 December 2018 (02:17 UTC), 13 km deep.

USGS: 43 km NW of San Antonio, Puerto Rico

10:17 pm AST, Dec 8, 2018 · · 13 km deep · released about 100 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 42 kmIsabela Municipio 50 kmAguada Municipio 50 kmRincón Municipio 52 kmMoca Municipio 55 kmQuebradillas Municipio 58 kmAñasco Municipio 62 kmCamuy Municipio 65 kmSan Sebastián Municipio 66 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
10:17 pm AST on 8 December 2018 ()
Where
46 km (29 mi) north-northwest of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 2.4 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 42 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2895 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 16 km (10 mi) from the epicentre. In Aguadilla, 46 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 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 100,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.1× the energy of this one
  4. This earthquake M 2.4 about 100 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 810 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 27 km ENE of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 20 km ESE of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 21 km S of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 42 km SSE of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 30 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 18.7995, -67.3505. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 42 km (26 mi) SSE earthquakes near Aguadilla Municipio
Isabela Municipio, PR 50 km (31 mi) SE earthquakes near Isabela Municipio
Aguada Municipio, PR 50 km (31 mi) SSE earthquakes near Aguada Municipio
Rincón Municipio, PR 52 km (32 mi) SSE earthquakes near Rincón Municipio
Moca Municipio, PR 55 km (34 mi) SSE earthquakes near Moca Municipio
Quebradillas Municipio, PR 58 km (36 mi) SE earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.6 64 km NW of San Antonio, Puerto Rico
  2. 2.7 63 km NW of San Antonio, Puerto Rico
  3. 2.3 24 km NW of Rincón, Puerto Rico
  4. 3.0 46 km NNW of San Antonio, Puerto Rico
  5. 2.9 68 km NW of Rincón, Puerto Rico
  6. 2.6 41 km NNW of San Antonio, Puerto Rico
  7. 2.4 25 km WNW of Rincón, Puerto Rico
  8. 2.8 20 km WNW of Rincón, Puerto Rico
  9. 2.7 35 km WNW of San Antonio, Puerto Rico
  10. 2.8 87 km NNW of San Antonio, Puerto Rico
  11. 2.1 7 km NNW of Rincón, Puerto Rico
  12. 2.3 22 km NW of Rincón, Puerto Rico
  13. 2.9 49 km NW of Aguadilla, Puerto Rico
  14. 2.8 53 km NNW of San Antonio, Puerto Rico
  15. 2.8 25 km NW of Rincón, 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.