QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

36 km SSW of Saint Croix, U.S. Virgin Islands

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 100 kmCulebra Municipio 112 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
50 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 100 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 297 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 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× 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 17.4163, -64.8472. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vieques Municipio, PR 100 km (62 mi) SE of here earthquakes near Vieques Municipio
Culebra Municipio, PR 112 km (70 mi) SSE of here earthquakes near Culebra Municipio
Ceiba Municipio, PR 124 km (77 mi) SE of here earthquakes near Ceiba Municipio
Humacao Municipio, PR 128 km (79 mi) SE of here earthquakes near Humacao Municipio
Maunabo Municipio, PR 129 km (80 mi) ESE of here earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 129 km (80 mi) ESE of here earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 3.2 54 km WSW of Saint Croix, U.S. Virgin Islands
  2. 3.1 30 km SSE of Saint Croix, U.S. Virgin Islands
  3. 3.1 18 km NW of Saint Croix, U.S. Virgin Islands
  4. 3.1 7 km S of Saint Croix, U.S. Virgin Islands
  5. 3.4 38 km SSW of Saint Croix, U.S. Virgin Islands

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.