QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2md

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

· 30 km deep · released about 35 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 4.2 (md)
Depth
30 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Loíza Municipio, 161 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1510 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 35 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 220× the energy of this one
  3. Magna, Utah 2020 M 5.7 150× the energy of this one
  4. This earthquake M 4.2 about 35 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 72× 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 19.4713, -64.8555. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 161 km (100 mi) NE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 167 km (104 mi) NE of here earthquakes near Carolina 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. 3.8 151 km NNE of Cruz Bay, U.S. Virgin Islands
  2. 3.9 114 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.7 75 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.8 105 km N of Cruz Bay, U.S. Virgin Islands
  5. 3.3 86 km N of Cruz Bay, U.S. Virgin Islands
  6. 3.5 85 km N of Cruz Bay, U.S. Virgin Islands
  7. 3.3 113 km N of Cruz Bay, U.S. Virgin Islands
  8. 4.0 110 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.8 88 km N of Cruz Bay, U.S. Virgin Islands
  10. 3.6 150 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 3.6 106 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.7 107 km NNW of Charlotte Amalie, U.S. Virgin Islands
  13. 3.7 114 km N of Cruz Bay, U.S. Virgin Islands
  14. 3.6 90 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 4.0 109 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 13 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.