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 12:54 am AST (04:54 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 6 km (4 mi) southeast of Isabela, PR, at 10:47 am AST on 26 March 2026 (14:47 UTC), 11 km deep.

USGS: 3 km NW of San Antonio, Puerto Rico

97 km (60 mi) W of San Juan, PR · 26 km (16 mi) W of Arecibo, PR

10:47 am AST, Mar 26, 2026 · · 11 km deep · released about 350 lb of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 4 kmQuebradillas Municipio 5 kmCamuy Municipio 13 kmMoca Municipio 15 kmSan Sebastián Municipio 16 kmAguadilla Municipio 17 kmHatillo Municipio 19 kmAguada Municipio 24 kmLares Municipio 25 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
10:47 am AST on 26 March 2026 ()
Where
6 km (4 mi) southeast of Isabela, PR · earthquakes near Isabela
Magnitude
M 2.7 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 231 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, people at rest would likely notice it out to about 22 km (14 mi) from the epicentre. In Isabela, 6 km away, the estimate is intensity III (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.

Likely felt in: Quebradillas 4 km, intensity III · Isabela 6 km, intensity III · Rafael Hernandez 11 km, intensity II · San Sebastián 15 km, intensity II · Hatillo 16 km, intensity II · Aguadilla 19 km, intensity II · Lares 22 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 350 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 43,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 31,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.7× the energy of this one
  4. This earthquake M 2.7 about 350 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 240 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 34 km NW of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 46 km WNW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 25 km W of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 28 km WNW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 28 km NW 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 18.4718, -66.9788. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Isabela Municipio, PR 4 km (2 mi) WNW earthquakes near Isabela Municipio
Quebradillas Municipio, PR 5 km (3 mi) E earthquakes near Quebradillas Municipio
Camuy Municipio, PR 13 km (8 mi) ESE earthquakes near Camuy Municipio
Moca Municipio, PR 15 km (9 mi) SW earthquakes near Moca Municipio
San Sebastián Municipio, PR 16 km (10 mi) S earthquakes near San Sebastián Municipio
Aguadilla Municipio, PR 17 km (11 mi) W earthquakes near Aguadilla Municipio

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

Aftershocks so far

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

  1. 2.6 23 km NNE of Isabela, Puerto Rico
  2. 2.0 1 km N of Lluveras, Puerto Rico
  3. 2.2 6 km NNE of Sabana Eneas, Puerto Rico
  4. 2.1 5 km NNE of Adjuntas, Puerto Rico
  5. 1.6 8 km NW of Adjuntas, Puerto Rico
  6. 2.7 5 km SE of Lares, Puerto Rico
  7. 3.3 8 km NE of Isabela, Puerto Rico
  8. 3.5 5 km WNW of Mayagüez, Puerto Rico
  9. 2.0 6 km ENE of Adjuntas, Puerto Rico
  10. 2.4 4 km SSE of Utuado, Puerto Rico
  11. 2.1 4 km SSE of Utuado, Puerto Rico
  12. 2.4 5 km N of Adjuntas, Puerto Rico
  13. 2.6 6 km NNE of Sabana Eneas, Puerto Rico
  14. 2.9 10 km SW of Stella, Puerto Rico
  15. 2.6 5 km WSW of Mayagüez, 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.