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 12:42 am AST (04:42 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 39 km (24 mi) west of Aguadilla, PR, at 1:43 pm AST on 27 July 2017 (17:43 UTC), 19 km deep.

USGS: 32 km WNW of Rincón, Puerto Rico

51 km (31 mi) NW of Mayagüez, PR · 144 km (89 mi) W of Bayamón, PR

1:43 pm AST, Jul 27, 2017 · · 19 km deep · released about 47 lb of TNT

Every earthquake near Aguadilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 32 kmAguada Municipio 37 kmAguadilla Municipio 40 kmAñasco Municipio 46 kmMoca Municipio 48 kmIsabela Municipio 53 kmHormigueros Municipio 57 kmMayagüez Municipio 58 kmSan Sebastián Municipio 60 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
1:43 pm AST on 27 July 2017 ()
Where
39 km (24 mi) west of Aguadilla, PR · earthquakes near Aguadilla
Magnitude
M 2.1 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 32 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3394 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, 39 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 47 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 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 43 km NE of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 21 km NE of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 33 km E of this epicentre
  4. 6.3 58 km E of Punta Cana, Dominican Republic · 36 km W of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 32 km ENE 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 18.4785, -67.5208. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 32 km (20 mi) ESE earthquakes near Rincón Municipio
Aguada Municipio, PR 37 km (23 mi) ESE earthquakes near Aguada Municipio
Aguadilla Municipio, PR 40 km (25 mi) E earthquakes near Aguadilla Municipio
Añasco Municipio, PR 46 km (29 mi) ESE earthquakes near Añasco Municipio
Moca Municipio, PR 48 km (30 mi) ESE earthquakes near Moca Municipio
Isabela Municipio, PR 53 km (33 mi) E earthquakes near Isabela Municipio

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

Aftershocks so far

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

  1. 4.3 21 km NW of Rincón, Puerto Rico
  2. 2.8 21 km NW of Rincón, Puerto Rico
  3. 4.4 52 km WNW of Rincón, Puerto Rico
  4. 3.3 35 km NW of Rincón, Puerto Rico
  5. 2.0 8 km NW of Puerto Real, Puerto Rico
  6. 3.1 56 km NW of San Antonio, Puerto Rico
  7. 3.0 45 km WSW of Stella, Puerto Rico
  8. 1.9 24 km NW of Rincón, Puerto Rico
  9. 2.6 26 km NW of Rincón, Puerto Rico
  10. 2.0 2 km ESE of La Playa, Puerto Rico
  11. 2.2 11 km WNW of Puerto Real, Puerto Rico
  12. 3.1 45 km NW of San Antonio, Puerto Rico
  13. 2.4 7 km W of Mayagüez, Puerto Rico
  14. 3.1 46 km NW of San Antonio, Puerto Rico
  15. 2.8 26 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.