QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

1 km SW of San Antonio, Puerto Rico

· 108 km deep · released about 1,200 lb of TNT

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10 km30 km60 km120 km N Vega Alta Municipio 3 kmDorado Municipio 6 kmVega Baja Municipio 9 kmToa Alta Municipio 11 kmToa Baja Municipio 12 kmCorozal Municipio 16 kmCataño Municipio 17 kmNaranjito Municipio 18 kmMorovis 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
108 km below the surface
Felt
no reports yet
Nearest
Vega Alta Municipio, 3 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3327 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 1,200 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 6.7 280,000× 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 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 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.

Where

Epicentre 18.4426, -66.3103. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vega Alta Municipio, PR 3 km (2 mi) ENE of here earthquakes near Vega Alta Municipio
Dorado Municipio, PR 6 km (4 mi) SW of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 9 km (6 mi) E of here earthquakes near Vega Baja Municipio
Toa Alta Municipio, PR 11 km (7 mi) NW of here earthquakes near Toa Alta Municipio
Toa Baja Municipio, PR 12 km (8 mi) W of here earthquakes near Toa Baja Municipio
Corozal Municipio, PR 16 km (10 mi) N of here earthquakes near Corozal Municipio

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

Aftershocks so far

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

  1. 2.8 Puerto Rico region
  2. 2.7 1 km SSE of Brenas, Puerto Rico
  3. 2.9 15 km NNE of Brenas, Puerto Rico
  4. 2.5 5 km ESE of G. L. Garcia, Puerto Rico
  5. 3.0 1 km SE of Corozal, Puerto Rico
  6. 2.8 15 km N of Brenas, Puerto Rico
  7. 2.8 32 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 2.7 26 km N of Tierras Nuevas Poniente, Puerto Rico
  9. 2.9 24 km N of Brenas, Puerto Rico
  10. 2.7 6 km SSW of Corozal, Puerto Rico
  11. 3.1 5 km NE of Orocovis, Puerto Rico
  12. 2.4 2 km W of Aibonito, Puerto Rico
  13. 3.0 6 km NW of Palomas, Puerto Rico
  14. 2.9 2 km NNE of Franquez, Puerto Rico
  15. 2.7 7 km NW of Sumidero, 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.