QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Earthquake near Trujillo Alto, PR

No earthquake was likely felt in Trujillo Alto in the 24 hours to 9:03 am AST (13:03 UTC). The last one was M 4.1, 83 km (52 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Trujillo Alto

This page: a magnitude 3.3 earthquake was recorded 4 km (3 mi) west-northwest of Trujillo Alto, PR, at 3:00 am AST on 30 November 2025 (07:00 UTC), 99 km deep. 1 person has reported feeling it to USGS.

USGS: 4 km WNW of Trujillo Alto, Puerto Rico

in San Juan, PR

3:00 am AST, Nov 30, 2025 · · 99 km deep · released about 1.2 tons of TNT

Every earthquake near Trujillo Alto Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan Municipio 6 kmTrujillo Alto Municipio 6 kmGuaynabo Municipio 8 kmCarolina Municipio 8 kmLoíza Municipio 13 kmGurabo Municipio 13 kmCataño Municipio 13 kmBayamón Municipio 14 kmAguas Buenas Municipio 16 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
3:00 am AST on 30 November 2025 ()
Where
4 km (3 mi) west-northwest of Trujillo Alto, PR · earthquakes near Trujillo Alto
Magnitude
M 3.3 (md)
Depth
99 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
San Juan Municipio, 6 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 346 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 Trujillo Alto, 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: Eleanor Roosevelt, Guaynabo, Carolina, Cataño, San Juan, Bayamón.

How big was it?

This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× 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 18 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 · 16 km SW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 34 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 18.3755, -66.0437. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Juan Municipio, PR 6 km (4 mi) NNW earthquakes near San Juan Municipio
Trujillo Alto Municipio, PR 6 km (4 mi) SE earthquakes near Trujillo Alto Municipio
Guaynabo Municipio, PR 8 km (5 mi) WSW earthquakes near Guaynabo Municipio
Carolina Municipio, PR 8 km (5 mi) ENE earthquakes near Carolina Municipio
Loíza Municipio, PR 13 km (8 mi) NE earthquakes near Loíza Municipio
Gurabo Municipio, PR 13 km (8 mi) SSE earthquakes near Gurabo Municipio

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

Aftershocks so far

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

  1. 2.1 3 km NNW of Palomas, Puerto Rico
  2. 2.3 5 km W of Campo Rico, Puerto Rico
  3. 2.7 16 km N of Brenas, Puerto Rico
  4. 2.8 8 km NE of Vieques, Puerto Rico
  5. 1.6 1 km SW of G. L. Garcia, Puerto Rico
  6. 1.8 7 km ESE of G. L. Garcia, Puerto Rico
  7. 1.7 1 km WSW of G. L. Garcia, Puerto Rico
  8. 2.0 1 km SSE of Cidra, Puerto Rico
  9. 1.9 3 km WNW of Orocovis, Puerto Rico
  10. 2.0 4 km WNW of Yaurel, Puerto Rico
  11. 3.1 9 km SSE of Daguao, Puerto Rico
  12. 2.8 10 km N of Brenas, Puerto Rico
  13. 2.6 2 km SW of Campo Rico, Puerto Rico
  14. 1.9 4 km SE of Jagual, Puerto Rico
  15. 2.6 5 km NNW of Aguas Buenas, 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.