QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

Earthquake near Isabela, PR

No earthquake was likely felt in Isabela in the 24 hours to 3:47 pm AST (19:47 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 3.4 earthquake was recorded 49 km (30 mi) north of Isabela, PR, at 11:39 am AST on 25 June 2024 (15:39 UTC), 12 km deep.

USGS: 48 km N of Isabela, Puerto Rico

11:39 am AST, Jun 25, 2024 · · 12 km deep · released about 2 tons of TNT

Every earthquake near Isabela Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 50 kmAguadilla Municipio 52 kmQuebradillas Municipio 54 kmCamuy Municipio 58 kmHatillo Municipio 61 kmMoca Municipio 62 kmAguada Municipio 64 kmSan Sebastián Municipio 68 kmArecibo Municipio 68 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
11:39 am AST on 25 June 2024 ()
Where
49 km (30 mi) north of Isabela, PR · earthquakes near Isabela
Magnitude
M 3.4 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 50 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 798 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 58 km (36 mi) from the epicentre. In Isabela, 49 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.

Likely felt in: Isabela 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× more

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 6.0 on 2019-09-24 — about 7,400 times the energy of this one.

Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 8 km WSW of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 30 km SSW of this epicentre
  3. 6.4 61 km N of Hatillo, Puerto Rico · 27 km ENE of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 47 km SSW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 36 km SSW 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 18.9370, -67.0448. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Isabela Municipio, PR 50 km (31 mi) S earthquakes near Isabela Municipio
Aguadilla Municipio, PR 52 km (32 mi) SSW earthquakes near Aguadilla Municipio
Quebradillas Municipio, PR 54 km (33 mi) SSE earthquakes near Quebradillas Municipio
Camuy Municipio, PR 58 km (36 mi) SSE earthquakes near Camuy Municipio
Hatillo Municipio, PR 61 km (38 mi) SSE earthquakes near Hatillo Municipio
Moca Municipio, PR 62 km (39 mi) S earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.0 19 km NNW of Camuy, Puerto Rico
  2. 3.6 51 km N of Hatillo, Puerto Rico
  3. 3.3 57 km NNE of Isabela, Puerto Rico
  4. 3.1 55 km NNW of San Antonio, Puerto Rico
  5. 3.0 36 km N of Carrizales, Puerto Rico
  6. 2.8 28 km NW of San Antonio, Puerto Rico
  7. 3.2 55 km NW of San Antonio, Puerto Rico
  8. 3.2 20 km N of Arecibo, Puerto Rico
  9. 3.1 32 km NNW of Isabela, Puerto Rico
  10. 3.7 64 km NNW of San Antonio, Puerto Rico
  11. 3.7 72 km NNW of San Antonio, Puerto Rico
  12. 3.7 85 km NNW of San Antonio, Puerto Rico
  13. 3.4 52 km NNW of San Antonio, Puerto Rico
  14. 3.4 56 km NNW of San Antonio, Puerto Rico
  15. 3.3 48 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.