QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near Isabela, PR

No earthquake was likely felt in Isabela in the 24 hours to 12:52 pm AST (16:52 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 2.8 earthquake was recorded 13 km (8 mi) northeast of Isabela, PR, at 3:14 am AST on 3 April 2026 (07:14 UTC), 76 km deep.

USGS: 12 km NE of Isabela, Puerto Rico

96 km (59 mi) WNW of San Juan, PR · 27 km (17 mi) NW of Arecibo, PR

3:14 am AST, Apr 3, 2026 · · 76 km deep · released about 430 lb of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 14 kmQuebradillas Municipio 14 kmCamuy Municipio 19 kmHatillo Municipio 23 kmAguadilla Municipio 24 kmMoca Municipio 28 kmSan Sebastián Municipio 29 kmArecibo Municipio 34 kmAguada Municipio 35 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
3:14 am AST on 3 April 2026 ()
Where
13 km (8 mi) northeast of Isabela, PR · earthquakes near Isabela
Magnitude
M 2.8 (md)
Depth
76 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 14 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 222 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, 13 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: Quebradillas, Camuy, Mora, Cacao, Hatillo, Piedra Gorda.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 2025-08-22 — about 200 times the energy of this one.

Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 39 km NNW of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 28 km WNW of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 46 km W of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 33 km WSW of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 30 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 18.5925, -66.9487. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Isabela Municipio, PR 14 km (9 mi) SSW earthquakes near Isabela Municipio
Quebradillas Municipio, PR 14 km (9 mi) S earthquakes near Quebradillas Municipio
Camuy Municipio, PR 19 km (12 mi) SSE earthquakes near Camuy Municipio
Hatillo Municipio, PR 23 km (14 mi) SE earthquakes near Hatillo Municipio
Aguadilla Municipio, PR 24 km (15 mi) WSW earthquakes near Aguadilla Municipio
Moca Municipio, PR 28 km (17 mi) SSW earthquakes near Moca 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. 2.7 9 km WNW of San Antonio, Puerto Rico
  2. 2.7 17 km NW of Aguadilla, Puerto Rico
  3. 2.3 4 km N of Adjuntas, Puerto Rico
  4. 2.6 5 km SSW of Utuado, Puerto Rico
  5. 2.3 9 km SSE of Lares, Puerto Rico
  6. 2.5 21 km NNW of Camuy, Puerto Rico
  7. 2.5 6 km ESE of Maricao, Puerto Rico
  8. 2.1 2 km WSW of Maricao, Puerto Rico
  9. 2.8 13 km N of Hatillo, Puerto Rico
  10. 2.2 3 km N of Las Marias, Puerto Rico
  11. 3.0 35 km NW of San Antonio, Puerto Rico
  12. 2.5 16 km N of Arecibo, Puerto Rico
  13. 3.1 53 km N of San Antonio, Puerto Rico
  14. 2.8 45 km NNW of San Antonio, Puerto Rico
  15. 1.9 10 km WNW of Adjuntas, 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.