QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

3 km ESE of San Juan, Puerto Rico

· 112 km deep · released about 1,500 lb of TNT

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10 km30 km60 km120 km N San Juan Municipio 3 kmCataño Municipio 8 kmGuaynabo Municipio 12 kmToa Baja Municipio 12 kmCarolina Municipio 13 kmLoíza Municipio 14 kmTrujillo Alto Municipio 15 kmBayamón Municipio 15 kmDorado Municipio 20 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
Magnitude
M 3.1 (md)
Depth
112 km below the surface
Felt
no reports yet
Nearest
San Juan Municipio, 3 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 157 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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.

Where

Epicentre 18.4488, -66.0753. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan Municipio, PR 3 km (2 mi) NNW of here earthquakes near San Juan Municipio
Cataño Municipio, PR 8 km (5 mi) E of here earthquakes near Cataño Municipio
Guaynabo Municipio, PR 12 km (8 mi) NNE of here earthquakes near Guaynabo Municipio
Toa Baja Municipio, PR 12 km (8 mi) E of here earthquakes near Toa Baja Municipio
Carolina Municipio, PR 13 km (8 mi) WNW of here earthquakes near Carolina Municipio
Loíza Municipio, PR 14 km (9 mi) W of here earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 2.8 8 km NNE of Tierras Nuevas Poniente, Puerto Rico
  2. 2.2 5 km WSW of Naranjito, Puerto Rico
  3. 3.1 2 km SW of Hato Candal, Puerto Rico
  4. 2.8 10 km NNE of Tierras Nuevas Poniente, Puerto Rico
  5. 2.3 5 km NNW of Coco, Puerto Rico
  6. 2.3 4 km N of Brenas, Puerto Rico
  7. 2.9 7 km NNE of Brenas, Puerto Rico
  8. 2.7 5 km SW of Guaynabo, Puerto Rico
  9. 3.2 31 km NNE of Vieques, Puerto Rico
  10. 2.1 3 km NE of La Plena, Puerto Rico
  11. 2.9 29 km N of San Juan, Puerto Rico
  12. 2.0 2 km N of Olimpo, Puerto Rico
  13. 1.9 4 km ENE of La Plena, Puerto Rico
  14. 2.8 15 km NNE of Dorado, Puerto Rico
  15. 3.1 0 km WNW of Monserrate, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2026-04-13 — it released about 34 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.