QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Guaynabo, PR

No earthquake was likely felt in Guaynabo in the 24 hours to 4:25 pm AST (20:25 UTC). The last one was M 4.1, 93 km (58 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 Guaynabo

This page: a magnitude 3.1 earthquake was recorded in Guaynabo, PR, at 11:47 am AST on 11 January 2026 (15:47 UTC), 117 km deep.

USGS: 1 km SSE of Guaynabo, Puerto Rico

8 km (5 mi) SSW of San Juan, PR · 7 km (5 mi) ESE of Bayamón, PR

11:47 am AST, Jan 11, 2026 · · 117 km deep · released about 1,300 lb of TNT

Every earthquake near Guaynabo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guaynabo Municipio 1 kmBayamón Municipio 7 kmSan Juan Municipio 9 kmAguas Buenas Municipio 10 kmTrujillo Alto Municipio 11 kmCataño Municipio 12 kmToa Alta Municipio 15 kmGurabo Municipio 15 kmCarolina 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
11:47 am AST on 11 January 2026 ()
Where
in Guaynabo, PR · earthquakes near Guaynabo
Magnitude
M 3.1 (md)
Depth
117 km below the surface
Felt
no reports yet
Nearest
Guaynabo Municipio, 1 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 304 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: Bayamón, Eleanor Roosevelt, Aguas Buenas, Trujillo Alto, Cataño, Bairoa.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 4.6 on 2019-03-12 — about 190 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 · 10 km SSW of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 30 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 18.3450, -66.1052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guaynabo Municipio, PR 1 km (1 mi) W earthquakes near Guaynabo Municipio
Bayamón Municipio, PR 7 km (4 mi) W earthquakes near Bayamón Municipio
San Juan Municipio, PR 9 km (6 mi) NNE earthquakes near San Juan Municipio
Aguas Buenas Municipio, PR 10 km (6 mi) SSW earthquakes near Aguas Buenas Municipio
Trujillo Alto Municipio, PR 11 km (7 mi) E earthquakes near Trujillo Alto Municipio
Cataño Municipio, PR 12 km (7 mi) NNW earthquakes near Cataño 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. 3.2 10 km NNE of Brenas, Puerto Rico
  2. 3.4 8 km NNE of Brenas, Puerto Rico
  3. 1.8 6 km SSE of Arroyo, Puerto Rico
  4. 1.9 1 km SSW of Candelaria Arenas, Puerto Rico
  5. 3.1 3 km ESE of San Juan, Puerto Rico
  6. 2.5 5 km N of Coamo, Puerto Rico
  7. 4.2 2 km SW of Río Lajas, Puerto Rico
  8. 2.7 3 km SE of Jobos, Puerto Rico
  9. 1.5 1 km NE of Vázquez, Puerto Rico
  10. 2.1 1 km SE of Aguas Buenas, Puerto Rico
  11. 1.6 2 km ESE of Jobos, Puerto Rico
  12. 2.1 2 km SE of Jobos, Puerto Rico
  13. 2.5 1 km W of Santa Clara, Puerto Rico
  14. 2.5 4 km ESE of Pájaros, Puerto Rico
  15. 2.8 17 km N of San Juan, 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.