QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Isabela, PR

No earthquake was likely felt in Isabela in the 24 hours to 12:09 pm AST (16:09 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 2.3 earthquake was recorded 4 km (2 mi) east-northeast of Isabela, PR, at 11:55 am AST on 2 April 2019 (15:55 UTC), 59 km deep.

USGS: 3 km ENE of Isabela, Puerto Rico

99 km (61 mi) W of San Juan, PR · 28 km (17 mi) WNW of Arecibo, PR

11:55 am AST, Apr 2, 2019 · · 59 km deep · released about 98 lb of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 5 kmQuebradillas Municipio 9 kmCamuy Municipio 16 kmAguadilla Municipio 17 kmMoca Municipio 18 kmSan Sebastián Municipio 21 kmHatillo Municipio 22 kmAguada Municipio 26 kmAñasco Municipio 30 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
11:55 am AST on 2 April 2019 ()
Where
4 km (2 mi) east-northeast of Isabela, PR · earthquakes near Isabela
Magnitude
M 2.3 (md)
Depth
59 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 5 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2780 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 Isabela, 4 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: Mora, Quebradillas, Rafael Hernandez, Cacao, Aceitunas, Piedra Gorda.

How big was it?

This earthquake released about 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 870 times the energy of this one.

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

  1. 7.7 45 km N of San Antonio, Puerto Rico · 45 km NNW of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 29 km NW of this epicentre
  3. 6.4 32 km NW of Aguadilla, Puerto Rico · 43 km WNW of this epicentre
  4. 6.3 6 km WNW of Aguadilla, Puerto Rico · 25 km WSW of this epicentre
  5. 6.1 15 km WNW of San Antonio, Puerto Rico · 25 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 18.5205, -66.9930. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Isabela Municipio, PR 5 km (3 mi) SSW earthquakes near Isabela Municipio
Quebradillas Municipio, PR 9 km (6 mi) SE earthquakes near Quebradillas Municipio
Camuy Municipio, PR 16 km (10 mi) ESE earthquakes near Camuy Municipio
Aguadilla Municipio, PR 17 km (10 mi) WSW earthquakes near Aguadilla Municipio
Moca Municipio, PR 18 km (11 mi) SSW earthquakes near Moca Municipio
San Sebastián Municipio, PR 21 km (13 mi) S earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 2.6 42 km NW of San Antonio, Puerto Rico
  2. 2.2 20 km WNW of Rincón, Puerto Rico
  3. 2.7 28 km NW of Rincón, Puerto Rico
  4. 1.7 9 km NNW of San Antonio, Puerto Rico
  5. 2.9 48 km N of Hatillo, Puerto Rico
  6. 2.5 22 km NW of Rincón, Puerto Rico
  7. 1.6 4 km SW of Maricao, Puerto Rico
  8. 1.8 2 km WNW of Sabana Grande, Puerto Rico
  9. 2.3 39 km N of Hatillo, Puerto Rico
  10. 1.5 1 km NNW of Animas, Puerto Rico
  11. 1.9 2 km N of Animas, Puerto Rico
  12. 1.5 1 km WSW of Sabana Grande, Puerto Rico
  13. 2.6 44 km NNW of San Antonio, Puerto Rico
  14. 2.1 6 km NNE of Sabana Eneas, Puerto Rico
  15. 2.7 41 km NNW 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.