QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

Earthquake near Carolina, PR

No earthquake was likely felt in Carolina in the 24 hours to 4:04 pm AST (20:04 UTC). The last one was M 4.1, 81 km (50 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Carolina

This page: a magnitude 3.6 earthquake was recorded in Carolina, PR, at 3:26 am AST on 5 June 2025 (07:26 UTC), 126 km deep.

USGS: 1 km ESE of Carolina, Puerto Rico

6 km (4 mi) SE of Carolina, PR

3:26 am AST, Jun 5, 2025 · · 126 km deep · released about 4.2 tons of TNT

Every earthquake near Carolina Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Carolina Municipio 4 kmCanóvanas Municipio 8 kmTrujillo Alto Municipio 8 kmLoíza Municipio 8 kmGurabo Municipio 12 kmSan Juan Municipio 14 kmRío Grande Municipio 15 kmJuncos Municipio 17 kmGuaynabo Municipio 18 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
3:26 am AST on 5 June 2025 ()
Where
in Carolina, PR · earthquakes near Carolina
Magnitude
M 3.6 (md)
Depth
126 km below the surface
Felt
no reports yet
Measured shaking
intensity II (ShakeMap)
Nearest
Carolina Municipio, 4 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 448 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. 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: Santa Barbara, Canovanas, Campo Rico, San Isidro, Trujillo Alto, Loíza.

How big was it?

This earthquake released about 4.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 40,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,300× the energy of this one
  4. This earthquake M 3.6 about 4.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 8.8× 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 4.1 on 2019-05-02 — about 5.1 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 24 km WSW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 44 km WNW 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 18.3751, -65.9426. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Carolina Municipio, PR 4 km (2 mi) NW earthquakes near Carolina Municipio
Canóvanas Municipio, PR 8 km (5 mi) SE earthquakes near Canóvanas Municipio
Trujillo Alto Municipio, PR 8 km (5 mi) SW earthquakes near Trujillo Alto Municipio
Loíza Municipio, PR 8 km (5 mi) N earthquakes near Loíza Municipio
Gurabo Municipio, PR 12 km (8 mi) SSW earthquakes near Gurabo Municipio
San Juan Municipio, PR 14 km (9 mi) WNW earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 2.9 2 km S of Cayey, Puerto Rico
  2. 1.9 2 km SE of Cidra, Puerto Rico
  3. 3.0 3 km SW of Vega Alta, Puerto Rico
  4. 2.5 6 km WNW of Aguas Buenas, Puerto Rico
  5. 2.7 3 km SSE of San Lorenzo, Puerto Rico
  6. 3.5 12 km NNE of Fajardo, Puerto Rico
  7. 2.2 3 km SSE of G. L. Garcia, Puerto Rico
  8. 2.8 2 km ENE of Parcelas Nuevas, Puerto Rico
  9. 2.6 21 km NNE of Dorado, Puerto Rico
  10. 3.6 20 km N of Dorado, Puerto Rico
  11. 1.8 5 km W of Rosa Sanchez, Puerto Rico
  12. 1.8 4 km E of Pastos, Puerto Rico
  13. 2.0 4 km SW of Jagual, Puerto Rico
  14. 2.1 4 km N of Orocovis, Puerto Rico
  15. 1.9 6 km ENE of Orocovis, 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.