QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Mayagüez, PR

No earthquake was likely felt in Mayagüez in the 24 hours to 8:37 pm AST (00:37 UTC). The last one was M 2.9, 25 km (15 mi) SSE, at 3:17 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Mayagüez

This page: a magnitude 2.7 earthquake was recorded in Mayagüez, PR, at 2:37 am AST on 27 April 2017 (06:37 UTC), 29 km deep.

USGS: 1 km ENE of Mayagüez, Puerto Rico

in Mayagüez, PR · 114 km (71 mi) W of San Juan, PR

2:37 am AST, Apr 27, 2017 · · 29 km deep · released about 380 lb of TNT

Every earthquake near Mayagüez Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 8 kmAñasco Municipio 9 kmSan Germán Municipio 15 kmLas Marías Municipio 16 kmRincón Municipio 20 kmMoca Municipio 20 kmAguada Municipio 20 kmMaricao Municipio 21 kmSan Sebastián Municipio 22 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
2:37 am AST on 27 April 2017 ()
Where
in Mayagüez, PR · earthquakes near Mayagüez
Magnitude
M 2.7 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 8 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3485 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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: Hormigueros, Espino, Añasco, Las Marias, La Playa, Monte Grande.

How big was it?

This earthquake released about 380 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 40,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 29,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 380 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 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 28 km NNW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 40 km NNW of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 48 km N of this epicentre
  4. 5.8 4 km E of Moca, Puerto Rico · 22 km NNE of this epicentre
  5. 5.2 19 km SW of Stella, Puerto Rico · 26 km W 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 18.2070, -67.1275. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 8 km (5 mi) S earthquakes near Hormigueros Municipio
Añasco Municipio, PR 9 km (6 mi) N earthquakes near Añasco Municipio
San Germán Municipio, PR 15 km (9 mi) SE earthquakes near San Germán Municipio
Las Marías Municipio, PR 16 km (10 mi) E earthquakes near Las Marías Municipio
Rincón Municipio, PR 20 km (12 mi) NW earthquakes near Rincón Municipio
Moca Municipio, PR 20 km (12 mi) NNE earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.3 12 km N of Isabela, Puerto Rico
  2. 2.1 8 km WSW of Guánica, Puerto Rico
  3. 2.1 1 km SSE of Stella, Puerto Rico
  4. 1.9 Mona Passage
  5. 2.5 9 km SW of Guánica, Puerto Rico
  6. 2.0 16 km NW of Puerto Real, Puerto Rico
  7. 1.9 16 km SW of Stella, Puerto Rico
  8. 2.4 13 km SSW of Guánica, Puerto Rico
  9. 2.9 38 km WSW of Stella, Puerto Rico
  10. 2.3 7 km NNW of Puerto Real, Puerto Rico
  11. 1.6 2 km SW of Palmarejo, Puerto Rico
  12. 2.1 Puerto Rico region
  13. 1.6 19 km S of Pole Ojea, Puerto Rico
  14. 2.9 24 km WNW of Rincón, Puerto Rico
  15. 2.9 13 km WNW of Puerto Real, 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.