QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

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

· 56 km deep · released about 12 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 111 kmFajardo Municipio 113 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
56 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 111 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1498 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 12 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 14,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 640× the energy of this one
  3. Magna, Utah 2020 M 5.7 450× the energy of this one
  4. This earthquake M 3.9 about 12 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 25× 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 19.3085, -65.1301. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 111 km (69 mi) N of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 113 km (70 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 121 km (75 mi) NNE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 125 km (78 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 128 km (80 mi) NNE of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 129 km (80 mi) NE of here earthquakes near Loíza 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. 3.7 109 km NNE of Vieques, Puerto Rico
  2. 3.4 75 km N of Culebra, Puerto Rico
  3. 3.4 Virgin Islands
  4. 3.0 67 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.3 Puerto Rico region
  6. 3.4 96 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.1 114 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.7 107 km N of Cruz Bay, U.S. Virgin Islands
  9. 3.5 104 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.6 82 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.7 86 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.7 75 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 3.4 Virgin Islands
  14. 3.9 117 km N of Cruz Bay, U.S. Virgin Islands
  15. 3.7 134 km NNE of Vieques, 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 5.0 on 2021-02-06 — it released about 39 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.