QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

38 km NNW of Charlotte Amalie, U.S. Virgin Islands

· 10 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 51 kmFajardo Municipio 70 kmVieques Municipio 77 kmCeiba Municipio 81 kmLuquillo Municipio 82 kmRío Grande Municipio 90 kmNaguabo Municipio 93 kmCanóvanas Municipio 101 kmLoíza Municipio 103 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
10 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 51 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1398 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 1,400 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 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.6803, -65.0023. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 51 km (32 mi) NE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 70 km (43 mi) ENE of here earthquakes near Fajardo Municipio
Vieques Municipio, PR 77 km (48 mi) NE of here earthquakes near Vieques Municipio
Ceiba Municipio, PR 81 km (50 mi) NE of here earthquakes near Ceiba Municipio
Luquillo Municipio, PR 82 km (51 mi) ENE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 90 km (56 mi) ENE of here earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.7 Puerto Rico region
  2. 3.1 43 km NNE of Culebra, Puerto Rico
  3. 2.9 49 km NE of Luquillo, Puerto Rico
  4. 3.3 Puerto Rico region
  5. 3.6 Puerto Rico region
  6. 3.4 Puerto Rico region
  7. 3.1 Puerto Rico region
  8. 2.9 59 km N of Cruz Bay, U.S. Virgin Islands
  9. 3.6 Virgin Islands
  10. 3.4 62 km N of Culebra, Puerto Rico
  11. 3.2 62 km N of Culebra, Puerto Rico
  12. 3.2 59 km NNE of Cruz Bay, U.S. Virgin Islands
  13. 3.0 57 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.4 69 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.2 Puerto Rico region

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 2021-03-09 — it released about 330 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.