QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

71 km N of Charlotte Amalie, U.S. Virgin Islands

· 20 km deep · released about 1,600 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 79 kmFajardo Municipio 89 kmLuquillo Municipio 100 kmCeiba Municipio 103 kmVieques Municipio 105 kmRío Grande Municipio 106 kmLoíza Municipio 114 kmNaguabo Municipio 114 kmCanóvanas Municipio 116 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
20 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 79 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1277 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 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 210,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
  4. This earthquake M 3.1 about 1,600 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× 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 18.9860, -65.0245. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 79 km (49 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 89 km (55 mi) NE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 100 km (62 mi) NE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 103 km (64 mi) NE of here earthquakes near Ceiba Municipio
Vieques Municipio, PR 105 km (65 mi) NNE of here earthquakes near Vieques Municipio
Río Grande Municipio, PR 106 km (66 mi) NE 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

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

  1. 3.3 73 km N of Culebra, Puerto Rico
  2. 3.5 72 km NNE of Luquillo, Puerto Rico
  3. 2.8 84 km NNE of Luquillo, Puerto Rico
  4. 3.5 76 km NNE of Luquillo, Puerto Rico
  5. 3.4 84 km NNE of Luquillo, Puerto Rico
  6. 3.6 Puerto Rico region
  7. 2.8 85 km N of Culebra, Puerto Rico
  8. 3.4 81 km NNE of Luquillo, Puerto Rico
  9. 3.3 47 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.1 41 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.8 97 km N of Cruz Bay, U.S. Virgin Islands
  12. 3.8 38 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 3.4 81 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.5 84 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 3.8 49 km N of Charlotte Amalie, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2021-02-06 — it released about 580 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.