QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

112 km N of Cruz Bay, U.S. Virgin Islands

· 71 km deep · released about 16 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 4.0 (md)
Depth
71 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 132 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1107 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 16 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 10,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 470× the energy of this one
  3. Magna, Utah 2020 M 5.7 330× the energy of this one
  4. This earthquake M 4.0 about 16 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 34× 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 19.3411, -64.6641. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 132 km (82 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 144 km (89 mi) NE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 154 km (96 mi) NE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 160 km (100 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

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

  1. 3.8 101 km NNE of Cruz Bay, U.S. Virgin Islands
  2. 3.4 92 km N of Cruz Bay, U.S. Virgin Islands
  3. 4.0 155 km NNE of Cruz Bay, U.S. Virgin Islands
  4. 3.9 159 km NNE of Cruz Bay, U.S. Virgin Islands
  5. 3.6 114 km NNE of Cruz Bay, U.S. Virgin Islands
  6. 3.9 128 km NNE of Cruz Bay, U.S. Virgin Islands
  7. 3.9 138 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.6 92 km NNE of Cruz Bay, U.S. Virgin Islands
  9. 3.8 138 km N of Cruz Bay, U.S. Virgin Islands
  10. 3.9 131 km N of Cruz Bay, U.S. Virgin Islands
  11. 3.8 135 km N of Cruz Bay, U.S. Virgin Islands
  12. 3.9 153 km N of Cruz Bay, U.S. Virgin Islands
  13. 3.6 140 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.7 103 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 3.9 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 29 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.