QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

8 km N of Arecibo, Puerto Rico

· 88 km deep · released about 1.8 tons of TNT

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10 km30 km60 km120 km N Arecibo Municipio 13 kmHatillo Municipio 15 kmBarceloneta Municipio 19 kmCamuy Municipio 19 kmQuebradillas Municipio 24 kmFlorida Municipio 26 kmManatí Municipio 26 kmUtuado Municipio 31 kmIsabela Municipio 32 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
88 km below the surface
Felt
no reports yet
Nearest
Arecibo Municipio, 13 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 862 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 1.8 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 92,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,900× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.8× 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 18.5487, -66.7155. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Arecibo Municipio, PR 13 km (8 mi) NNW of here earthquakes near Arecibo Municipio
Hatillo Municipio, PR 15 km (9 mi) NE of here earthquakes near Hatillo Municipio
Barceloneta Municipio, PR 19 km (12 mi) WNW of here earthquakes near Barceloneta Municipio
Camuy Municipio, PR 19 km (12 mi) NE of here earthquakes near Camuy Municipio
Quebradillas Municipio, PR 24 km (15 mi) ENE of here earthquakes near Quebradillas Municipio
Florida Municipio, PR 26 km (16 mi) NW of here earthquakes near Florida Municipio

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

Aftershocks so far

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

  1. 2.0 7 km E of Maricao, Puerto Rico
  2. 2.6 3 km WNW of Orocovis, Puerto Rico
  3. 3.0 11 km NNE of Carrizales, Puerto Rico
  4. 2.0 3 km WNW of Orocovis, Puerto Rico
  5. 2.5 15 km N of Arecibo, Puerto Rico
  6. 3.9 2 km SSW of Utuado, Puerto Rico
  7. 3.0 14 km N of Hatillo, Puerto Rico
  8. 2.7 4 km NW of Orocovis, Puerto Rico
  9. 2.4 10 km N of Arecibo, Puerto Rico
  10. 2.7 16 km NNE of Isabela, Puerto Rico
  11. 2.1 7 km WSW of Adjuntas, Puerto Rico
  12. 3.0 7 km NNE of Tierras Nuevas Poniente, Puerto Rico
  13. 3.4 32 km N of San Antonio, Puerto Rico
  14. 2.7 17 km N of Arecibo, Puerto Rico
  15. 2.6 13 km NNE of Arecibo, 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 33 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.