QuakeIndex

Earthquake · reviewed by a seismologist

M 4.4mb

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

· 18 km deep · released about 60 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 4.4 (mb)
Depth
18 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3814 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 60 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
  3. Magna, Utah 2020 M 5.7 89× the energy of this one
  4. This earthquake M 4.4 about 60 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 130× 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 20.2927, -65.0017. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.7 181 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.8 181 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.8 182 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.7 184 km NNE of Vieques, Puerto Rico
  5. 3.4 175 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.2 173 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.3 180 km NNE of Vieques, Puerto Rico
  8. 3.4 178 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 4.3 203 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 4.7 194 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 2.7 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.

On USGS

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