QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

2 km NE of Bayamón, Puerto Rico

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

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10 km30 km60 km120 km N Cataño Municipio 3 kmSan Juan Municipio 7 kmToa Baja Municipio 7 kmBayamón Municipio 8 kmGuaynabo Municipio 9 kmToa Alta Municipio 13 kmDorado Municipio 15 kmTrujillo Alto Municipio 17 kmAguas Buenas Municipio 18 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
119 km below the surface
Felt
no reports yet
Nearest
Cataño Municipio, 3 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 258 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,200× 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 18.4177, -66.1377. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cataño Municipio, PR 3 km (2 mi) SSE of here earthquakes near Cataño Municipio
San Juan Municipio, PR 7 km (5 mi) W of here earthquakes near San Juan Municipio
Toa Baja Municipio, PR 7 km (5 mi) SE of here earthquakes near Toa Baja Municipio
Bayamón Municipio, PR 8 km (5 mi) NNE of here earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 9 km (5 mi) NNW of here earthquakes near Guaynabo Municipio
Toa Alta Municipio, PR 13 km (8 mi) ENE of here earthquakes near Toa Alta 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. 2.1 7 km WSW of Naranjito, Puerto Rico
  2. 2.0 6 km S of G. L. Garcia, Puerto Rico
  3. 2.0 2 km ENE of Aguas Buenas, Puerto Rico
  4. 3.2 10 km NNE of Brenas, Puerto Rico
  5. 3.4 8 km NNE of Brenas, Puerto Rico
  6. 1.9 1 km SSW of Candelaria Arenas, Puerto Rico
  7. 3.1 3 km ESE of San Juan, Puerto Rico
  8. 2.5 5 km N of Coamo, Puerto Rico
  9. 4.2 2 km SW of Río Lajas, Puerto Rico
  10. 1.5 1 km NE of Vázquez, Puerto Rico
  11. 2.1 1 km SE of Aguas Buenas, Puerto Rico
  12. 2.5 1 km W of Santa Clara, Puerto Rico
  13. 2.5 27 km NNE of Vieques, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2018-12-09 — it released about 80 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.