QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1Md

1 km SSE of Pájaros, Puerto Rico

· 112 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 4 kmBayamón Municipio 4 kmNaranjito Municipio 9 kmGuaynabo Municipio 10 kmToa Baja Municipio 11 kmCataño Municipio 12 kmCorozal Municipio 14 kmAguas Buenas Municipio 14 kmDorado Municipio 14 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
Toa Alta Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3533 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 1,300 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 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× 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 1.4× 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 18.3560, -66.2088. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 4 km (2 mi) ESE of here earthquakes near Toa Alta Municipio
Bayamón Municipio, PR 4 km (3 mi) W of here earthquakes near Bayamón Municipio
Naranjito Municipio, PR 9 km (5 mi) NNE of here earthquakes near Naranjito Municipio
Guaynabo Municipio, PR 10 km (6 mi) W of here earthquakes near Guaynabo Municipio
Toa Baja Municipio, PR 11 km (7 mi) S of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 12 km (7 mi) SSW of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 1.7 3 km WNW of Candelero Arriba, Puerto Rico
  2. 2.8 4 km NE of San Juan, Puerto Rico
  3. 2.9 6 km SW of Guaynabo, Puerto Rico
  4. 2.3 8 km ESE of Jayuya, Puerto Rico
  5. 2.6 1 km N of Candelaria Arenas, Puerto Rico
  6. 1.8 2 km WSW of Villalba, Puerto Rico
  7. 2.6 12 km N of Garrochales, Puerto Rico
  8. 2.9 32 km NNW of Brenas, Puerto Rico
  9. 2.6 14 km N of San Juan, Puerto Rico
  10. 2.3 4 km WNW of Villalba, Puerto Rico
  11. 1.8 3 km S of Cayey, Puerto Rico
  12. 2.5 3 km SE of Salinas, Puerto Rico
  13. 2.7 1 km S of Las Ochenta, Puerto Rico
  14. 2.9 35 km N of San Juan, Puerto Rico
  15. 2.0 3 km NW of Villalba, 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.