QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

9 km WSW of Culebra, Puerto Rico

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

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10 km30 km60 km120 km N Culebra Municipio 10 kmVieques Municipio 16 kmCeiba Municipio 26 kmFajardo Municipio 26 kmLuquillo Municipio 37 kmNaguabo Municipio 38 kmHumacao Municipio 46 kmRío Grande Municipio 46 kmLas Piedras Municipio 53 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
19 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 10 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1585 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 18.2637, -65.3768. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 10 km (6 mi) SW of here earthquakes near Culebra Municipio
Vieques Municipio, PR 16 km (10 mi) NNE of here earthquakes near Vieques Municipio
Ceiba Municipio, PR 26 km (16 mi) E of here earthquakes near Ceiba Municipio
Fajardo Municipio, PR 26 km (16 mi) ESE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 37 km (23 mi) ESE of here earthquakes near Luquillo Municipio
Naguabo Municipio, PR 38 km (24 mi) E of here earthquakes near Naguabo Municipio

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

Aftershocks so far

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

  1. 2.5 12 km SE of Esperanza, Puerto Rico
  2. 2.8 Puerto Rico region
  3. 2.9 Puerto Rico region
  4. 2.8 27 km NNE of Luquillo, Puerto Rico
  5. 2.4 5 km ESE of Punta Santiago, Puerto Rico
  6. 3.2 24 km SW of Esperanza, Puerto Rico
  7. 2.5 6 km S of Esperanza, Puerto Rico
  8. 3.4 25 km NNE of Playa Fortuna, Puerto Rico
  9. 2.3 16 km S of Esperanza, Puerto Rico
  10. 2.9 13 km S of Esperanza, Puerto Rico
  11. 2.9 31 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 2.4 15 km S of Esperanza, Puerto Rico
  13. 2.3 6 km S of Esperanza, Puerto Rico
  14. 2.6 2 km NW of Punta Santiago, Puerto Rico
  15. 3.3 41 km N of Culebra, 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 4.8 on 2021-10-08 — it released about 320 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.