QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4Md

138 km NNE of Vieques, Puerto Rico

· 33 km deep · released about 1.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 3.4 (Md)
Depth
33 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3631 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 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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 19.5622, -65.2957. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.6 120 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 2.6 134 km NNE of Vieques, Puerto Rico
  3. 2.5 128 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 2.7 Puerto Rico region
  5. 3.0 123 km NNE of Vieques, Puerto Rico
  6. 2.2 90 km NNE of Luquillo, Puerto Rico
  7. 2.8 104 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 2.6 160 km NNE of Vieques, Puerto Rico
  9. 2.4 126 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 2.3 113 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.1 139 km NNE of Vieques, Puerto Rico
  12. 3.0 141 km NNE of Vieques, Puerto Rico
  13. 3.2 91 km N of Culebra, Puerto Rico
  14. 3.1 96 km N of Culebra, Puerto Rico
  15. 2.7 96 km N of Culebra, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.