QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near San Sebastián, PR

No earthquake was likely felt in San Sebastián in the 24 hours to 1:39 am AST (05:39 UTC). The last one was M 3.4, 50 km (31 mi) N, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near San Sebastián

This page: a magnitude 2.5 earthquake was recorded in San Sebastián, PR, at 11:30 am AST on 3 November 2025 (15:30 UTC), 12 km deep.

USGS: 0 km S of San Sebastián, Puerto Rico

98 km (61 mi) W of San Juan, PR · 21 km (13 mi) NE of Mayagüez, PR

11:30 am AST, Nov 3, 2025 · · 12 km deep · released about 180 lb of TNT

Every earthquake near San Sebastián Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Sebastián Municipio 2 kmMoca Municipio 11 kmLas Marías Municipio 11 kmLares Municipio 14 kmAñasco Municipio 15 kmQuebradillas Municipio 17 kmIsabela Municipio 17 kmMaricao Municipio 18 kmCamuy Municipio 19 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
11:30 am AST on 3 November 2025 ()
Where
in San Sebastián, PR · earthquakes near San Sebastián
Magnitude
M 2.5 (md)
Depth
12 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 2 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 374 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 19 km (12 mi) from the epicentre. 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: San Sebastián in town, intensity II · Lares 13 km, intensity II · Quebradillas 17 km, intensity II · Rafael Hernandez 18 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 86,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 61,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.4× the energy of this one
  4. This earthquake M 2.5 about 180 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 6.4 on 2020-01-07 — about 680,000 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 46 km NNW of this epicentre
  2. 6.3 6 km WNW of Aguadilla, Puerto Rico · 27 km WNW of this epicentre
  3. 6.1 15 km WNW of San Antonio, Puerto Rico · 35 km NW of this epicentre
  4. 6.1 18 km NNW of San Antonio, Puerto Rico · 40 km NNW of this epicentre
  5. 5.8 4 km E of Moca, Puerto Rico · 11 km NW 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 18.3293, -66.9917. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Sebastián Municipio, PR 2 km (1 mi) E earthquakes near San Sebastián Municipio
Moca Municipio, PR 11 km (7 mi) WNW earthquakes near Moca Municipio
Las Marías Municipio, PR 11 km (7 mi) S earthquakes near Las Marías Municipio
Lares Municipio, PR 14 km (9 mi) ESE earthquakes near Lares Municipio
Añasco Municipio, PR 15 km (10 mi) WSW earthquakes near Añasco Municipio
Quebradillas Municipio, PR 17 km (10 mi) NNE earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 3.2 12 km NNE of Carrizales, Puerto Rico
  2. 3.3 17 km SW of Stella, Puerto Rico
  3. 2.1 4 km ESE of La Parguera, Puerto Rico
  4. 2.1 2 km SW of Indios, Puerto Rico
  5. 1.7 7 km WSW of Fuig, Puerto Rico
  6. 2.1 2 km SW of Indios, Puerto Rico
  7. 2.5 4 km SW of Guánica, Puerto Rico
  8. 3.0 2 km SE of Yauco, Puerto Rico
  9. 2.4 3 km SSW of Indios, Puerto Rico
  10. 2.5 2 km S of Puerto Real, Puerto Rico
  11. 2.5 2 km NNE of Boquerón, Puerto Rico
  12. 2.3 3 km SSW of Puerto Real, Puerto Rico
  13. 2.3 2 km ESE of Yauco, Puerto Rico
  14. 2.8 1 km SW of Indios, Puerto Rico
  15. 2.5 4 km ESE of La Parguera, 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.