QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4Md

2 km S of La Alianza, Puerto Rico

· 133 km deep · released about 1.9 tons of TNT

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10 km30 km60 km120 km N Florida Municipio 4 kmArecibo Municipio 11 kmBarceloneta Municipio 12 kmCiales Municipio 12 kmManatí Municipio 14 kmUtuado Municipio 15 kmJayuya Municipio 18 kmMorovis Municipio 20 kmHatillo Municipio 22 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 3.4 (Md)
Depth
133 km below the surface
Felt
no reports yet
Nearest
Florida Municipio, 4 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3510 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 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 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 18.3705, -66.6003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Florida Municipio, PR 4 km (2 mi) W of here earthquakes near Florida Municipio
Arecibo Municipio, PR 11 km (7 mi) SE of here earthquakes near Arecibo Municipio
Barceloneta Municipio, PR 12 km (7 mi) SSW of here earthquakes near Barceloneta Municipio
Ciales Municipio, PR 12 km (8 mi) NW of here earthquakes near Ciales Municipio
Manatí Municipio, PR 14 km (9 mi) SW of here earthquakes near Manatí Municipio
Utuado Municipio, PR 15 km (10 mi) NE of here earthquakes near Utuado Municipio

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

Aftershocks so far

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

  1. 2.0 2 km SSE of Magas Arriba, Puerto Rico
  2. 2.4 10 km N of Quebradillas, Puerto Rico
  3. 2.5 3 km W of Guaynabo, Puerto Rico
  4. 2.1 0 km N of Pastos, Puerto Rico
  5. 2.4 0 km WNW of Mariano Colón, Puerto Rico
  6. 1.8 2 km E of Sabana Grande, Puerto Rico
  7. 3.1 1 km WSW of Sabana, Puerto Rico
  8. 2.6 21 km NNE of Arecibo, Puerto Rico
  9. 2.7 4 km N of Hatillo, Puerto Rico
  10. 2.1 3 km SE of Maricao, Puerto Rico
  11. 3.1 19 km N of Camuy, Puerto Rico
  12. 2.7 18 km NNE of Carrizales, Puerto Rico
  13. 2.7 14 km N of Arecibo, Puerto Rico
  14. 2.8 2 km NE of Animas, Puerto Rico
  15. 2.1 2 km NE of Guayabal, 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.