QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

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

· 25 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 84 kmFajardo Municipio 95 kmLuquillo Municipio 105 kmCeiba Municipio 108 kmVieques Municipio 110 kmRío Grande Municipio 111 kmLoíza Municipio 119 kmNaguabo Municipio 119 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 3.9 (md)
Depth
25 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Culebra Municipio, 84 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1709 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 19.0183, -64.9883. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 84 km (52 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 95 km (59 mi) NE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 105 km (65 mi) NE of here earthquakes near Luquillo Municipio
Ceiba Municipio, PR 108 km (67 mi) NE of here earthquakes near Ceiba Municipio
Vieques Municipio, PR 110 km (68 mi) NNE of here earthquakes near Vieques Municipio
Río Grande Municipio, PR 111 km (69 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

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

  1. 3.7 79 km N of Culebra, Puerto Rico
  2. 4.1 84 km NNW of Charlotte Amalie, U.S. Virgin Islands
  3. 3.9 Virgin Islands
  4. 3.8 59 km N of Cruz Bay, U.S. Virgin Islands
  5. 3.6 79 km NNE of Cruz Bay, U.S. Virgin Islands
  6. 3.8 79 km NNE of Cruz Bay, U.S. Virgin Islands
  7. 3.3 66 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 4.1 76 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.7 87 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.8 83 km N of Cruz Bay, U.S. Virgin Islands
  11. 4.0 120 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.8 105 km N of Cruz Bay, U.S. Virgin Islands
  13. 3.4 81 km N of Culebra, Puerto Rico
  14. 3.5 30 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.4 59 km NNE of Cruz Bay, 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 43 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.