QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Isabela, PR

No earthquake was likely felt in Isabela in the 24 hours to 6:05 pm AST (22:05 UTC). The last one was M 3.4, 31 km (19 mi) N, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Isabela

This page: a magnitude 2.7 earthquake was recorded 8 km (5 mi) west-northwest of Isabela, PR, at 2:09 am AST on 11 July 2025 (06:09 UTC), 26 km deep.

USGS: 3 km N of San Antonio, Puerto Rico

36 km (23 mi) N of Mayagüez, PR · 110 km (68 mi) W of San Juan, PR

2:09 am AST, Jul 11, 2025 · · 26 km deep · released about 330 lb of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 7 kmIsabela Municipio 10 kmMoca Municipio 17 kmAguada Municipio 19 kmQuebradillas Municipio 19 kmSan Sebastián Municipio 26 kmRincón Municipio 26 kmCamuy Municipio 26 kmAñasco Municipio 27 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
2:09 am AST on 11 July 2025 ()
Where
8 km (5 mi) west-northwest of Isabela, PR · earthquakes near Isabela
Magnitude
M 2.7 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 7 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 489 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. In Isabela, 8 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.

Earthquakes near other towns within 30 km: Rafael Hernandez, Aceitunas, Mora, Caban, Aguadilla, Moca.

How big was it?

This earthquake released about 330 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 46,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 33,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.9× the energy of this one
  4. This earthquake M 2.7 about 330 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 260 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 42 km N of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 22 km NNW of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 32 km WNW of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 15 km SW of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 14 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 18.5262, -67.0995. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 7 km (4 mi) SW earthquakes near Aguadilla Municipio
Isabela Municipio, PR 10 km (6 mi) ESE earthquakes near Isabela Municipio
Moca Municipio, PR 17 km (10 mi) S earthquakes near Moca Municipio
Aguada Municipio, PR 19 km (12 mi) SSW earthquakes near Aguada Municipio
Quebradillas Municipio, PR 19 km (12 mi) ESE earthquakes near Quebradillas Municipio
San Sebastián Municipio, PR 26 km (16 mi) SSE earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 2.8 2 km NE of San Germán, Puerto Rico
  2. 3.0 36 km N of San Antonio, Puerto Rico
  3. 3.3 4 km WSW of Las Marías, Puerto Rico
  4. 2.5 3 km SW of Luyando, Puerto Rico
  5. 3.0 47 km NNW of San Antonio, Puerto Rico
  6. 3.2 40 km N of Isabela, Puerto Rico
  7. 2.8 8 km E of Mayagüez, Puerto Rico
  8. 2.3 3 km NNW of Cabo Rojo, Puerto Rico
  9. 3.7 13 km WNW of Aguadilla, Puerto Rico
  10. 2.5 4 km E of Hormigueros, Puerto Rico
  11. 2.2 4 km E of Hormigueros, Puerto Rico
  12. 2.6 9 km NNW of Puerto Real, Puerto Rico
  13. 3.2 6 km NNW of Rincón, Puerto Rico
  14. 2.9 12 km NW of Puerto Real, Puerto Rico
  15. 2.6 13 km N of Arecibo, 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.