QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

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

· 34 km deep · released about 15 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
34 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 135 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2591 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 15 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 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 19.3730, -64.6591. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 135 km (84 mi) NNE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 147 km (91 mi) NE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 157 km (98 mi) NE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 163 km (101 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

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

  1. 2.7 106 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.0 119 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.0 99 km NNE of Cruz Bay, U.S. Virgin Islands
  4. 2.8 73 km N of Cruz Bay, U.S. Virgin Islands
  5. 2.8 85 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 4.0 94 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 2.6 96 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.4 86 km NNE of Cruz Bay, U.S. Virgin Islands
  9. 3.3 156 km N of Cruz Bay, U.S. Virgin Islands
  10. 3.3 90 km N of Cruz Bay, U.S. Virgin Islands
  11. 2.7 91 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.0 79 km N of Cruz Bay, U.S. Virgin Islands
  13. 2.9 100 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.6 92 km N of Cruz Bay, U.S. Virgin Islands
  15. 3.4 70 km N of Cruz Bay, U.S. 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 4.8 on 2019-02-18 — it released about 16 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.