QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

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

· 143 km deep · released about 12 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
143 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 137 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1860 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 12 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 14,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 640× the energy of this one
  3. Magna, Utah 2020 M 5.7 450× the energy of this one
  4. This earthquake M 3.9 about 12 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 25× 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 19.3165, -64.5398. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 137 km (85 mi) NE of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 151 km (94 mi) NE of here earthquakes near Fajardo Municipio
Ceiba Municipio, PR 164 km (102 mi) NE of here earthquakes near Ceiba Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 3.5 85 km N of Cruz Bay, U.S. Virgin Islands
  2. 3.7 72 km NNE of Cruz Bay, U.S. Virgin Islands
  3. 3.9 132 km NE of Cruz Bay, U.S. Virgin Islands
  4. 3.3 113 km N of Cruz Bay, U.S. Virgin Islands
  5. 3.9 126 km NE of Cruz Bay, U.S. Virgin Islands
  6. 3.5 82 km NNE of Cruz Bay, U.S. Virgin Islands
  7. 4.0 110 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.8 88 km N of Cruz Bay, U.S. Virgin Islands
  9. 3.6 106 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.7 114 km N of Cruz Bay, U.S. Virgin Islands
  11. 3.6 90 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.7 76 km N of Cruz Bay, U.S. Virgin Islands
  13. 4.0 109 km N of Cruz Bay, U.S. Virgin Islands
  14. 3.4 109 km NNE of Cruz Bay, U.S. Virgin Islands
  15. 3.5 153 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 5.0 on 2021-02-06 — it released about 39 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.