QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

137 km NNE of Vieques, Puerto Rico

· 25 km deep · released about 9 tons of TNT

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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
no reports yet
Nearest
Dorado Municipio, 158 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 870 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 9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 19,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 840× the energy of this one
  3. Magna, Utah 2020 M 5.7 600× the energy of this one
  4. This earthquake M 3.9 about 9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 19× 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 19.5471, -65.2791. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 158 km (98 mi) NE of here earthquakes near Dorado 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. 3.7 128 km N of Culebra, Puerto Rico
  2. 3.8 138 km NNE of Vieques, Puerto Rico
  3. 3.6 144 km NNE of Vieques, Puerto Rico
  4. 3.6 142 km NNE of Vieques, Puerto Rico
  5. 3.8 130 km NNE of Vieques, Puerto Rico
  6. 3.9 141 km NNE of Vieques, Puerto Rico
  7. 3.7 144 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 4.0 138 km NNE of Vieques, Puerto Rico
  9. 3.6 139 km NNW of Charlotte Amalie, U.S. Virgin Islands
  10. 3.7 139 km NNE of Vieques, Puerto Rico
  11. 3.4 147 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 3.7 154 km NNE of Vieques, Puerto Rico
  13. 3.4 148 km NNE of Vieques, Puerto Rico
  14. 3.4 138 km NNE of Vieques, Puerto Rico
  15. 3.7 151 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 4.9 on 2018-11-14 — it released about 38 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.