QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

Earthquake near San Antonio, PR

No earthquake was likely felt in San Antonio in the 24 hours to 10:07 am AST (14:07 UTC). The last one was M 4.8, 88 km (55 mi) SW, at 9:19 am AST on 18 September 2026, estimated intensity III (weak) in town; 86 felt reports to USGS. Every earthquake near San Antonio

This page: a magnitude 2.8 earthquake was recorded 5 km (3 mi) north of San Antonio, PR, at 11:50 am AST on 4 June 2025 (15:50 UTC), 75 km deep.

USGS: 4 km N of San Antonio, Puerto Rico

27 km (17 mi) WNW of San Juan, PR · 19 km (12 mi) NW of Bayamón, PR

11:50 am AST, Jun 4, 2025 · · 75 km deep · released about 450 lb of TNT

Every earthquake near San Antonio Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 5 kmVega Alta Municipio 7 kmVega Baja Municipio 11 kmToa Baja Municipio 12 kmToa Alta Municipio 15 kmCataño Municipio 17 kmManatí Municipio 21 kmCorozal Municipio 21 kmBayamón Municipio 21 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
11:50 am AST on 4 June 2025 ()
Where
5 km (3 mi) north of San Antonio, PR · earthquakes near San Antonio
Magnitude
M 2.8 (md)
Depth
75 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 5 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 525 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 San Antonio, 5 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: Brenas, Dorado, Sabana, Toa Baja, Ceiba, Monserrate.

How big was it?

This earthquake released about 450 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 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 4.4 on 2018-12-09 — about 270 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 29 km WNW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 31 km SE of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 4 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 18.4915, -66.3030. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Dorado Municipio, PR 5 km (3 mi) ESE earthquakes near Dorado Municipio
Vega Alta Municipio, PR 7 km (4 mi) SSW earthquakes near Vega Alta Municipio
Vega Baja Municipio, PR 11 km (7 mi) WSW earthquakes near Vega Baja Municipio
Toa Baja Municipio, PR 12 km (8 mi) ESE earthquakes near Toa Baja Municipio
Toa Alta Municipio, PR 15 km (10 mi) SSE earthquakes near Toa Alta Municipio
Cataño Municipio, PR 17 km (11 mi) ESE earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 2.3 4 km WNW of Orocovis, Puerto Rico
  2. 2.5 6 km WNW of Aguas Buenas, Puerto Rico
  3. 2.1 4 km WNW of Orocovis, Puerto Rico
  4. 2.6 13 km N of Arecibo, Puerto Rico
  5. 3.0 1 km SE of Coto Norte, Puerto Rico
  6. 2.2 3 km SSE of G. L. Garcia, Puerto Rico
  7. 2.4 6 km N of Villalba, 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. 2.0 6 km ENE of Utuado, Puerto Rico
  12. 1.8 4 km E of Pastos, Puerto Rico
  13. 3.1 46 km N of San Juan, Puerto Rico
  14. 3.2 6 km NNW of Arecibo, Puerto Rico
  15. 3.2 13 km NNW of Brenas, 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.