QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1ml

84 km NE of Cruz Bay, U.S. Virgin Islands

· 17 km deep · released about 21 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 4.1 (ml)
Depth
17 km below the surface
Felt
17 reports · strongest reported intensity IV
Nearest
Culebra Municipio, 126 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2515 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 17 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 18.9236, -64.2951. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 126 km (78 mi) ENE of here earthquakes near Culebra Municipio
Vieques Municipio, PR 149 km (93 mi) NE of here earthquakes near Vieques Municipio

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

Aftershocks so far

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

  1. 3.4 101 km NE of Cruz Bay, U.S. Virgin Islands
  2. 3.5 55 km NNE of Cruz Bay, U.S. Virgin Islands
  3. 3.2 64 km NE of Cruz Bay, U.S. Virgin Islands
  4. 3.7 85 km NNE of Cruz Bay, U.S. Virgin Islands
  5. 3.2 67 km NE of Cruz Bay, U.S. Virgin Islands
  6. 3.8 93 km NNE of Cruz Bay, U.S. Virgin Islands
  7. 3.1 87 km NNE of Cruz Bay, U.S. Virgin Islands
  8. 3.5 76 km ENE of Cruz Bay, U.S. Virgin Islands
  9. 3.3 62 km ENE of Cruz Bay, U.S. Virgin Islands
  10. 2.6 83 km NNE of Cruz Bay, U.S. Virgin Islands
  11. 3.2 67 km NE of Cruz Bay, U.S. Virgin Islands
  12. 3.5 54 km NE of Cruz Bay, U.S. Virgin Islands
  13. 4.4 73 km NE of Cruz Bay, U.S. Virgin Islands
  14. 3.5 Virgin Islands
  15. 3.7 112 km NNE 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 4.7 on 2018-04-06 — it released about 7.9 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.