QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1md

84 km NNW of Charlotte Amalie, U.S. Virgin Islands

· 25 km deep · released about 21 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 83 kmFajardo Municipio 86 kmLuquillo Municipio 95 kmRío Grande Municipio 100 kmCeiba Municipio 101 kmLoíza Municipio 105 kmVieques Municipio 107 kmCanóvanas Municipio 110 kmCarolina Municipio 111 km
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 (md)
Depth
25 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Culebra Municipio, 83 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has 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 8,200× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 370× the energy of this one
  3. Magna, Utah 2020 M 5.7 260× 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 43× 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 19.0621, -65.1848. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Culebra Municipio, PR 83 km (51 mi) N of here earthquakes near Culebra Municipio
Fajardo Municipio, PR 86 km (54 mi) NNE of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 95 km (59 mi) NE of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 100 km (62 mi) NE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 101 km (63 mi) NNE of here earthquakes near Ceiba Municipio
Loíza Municipio, PR 105 km (65 mi) NE of here earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 2.6 66 km N of Culebra, Puerto Rico
  2. 3.7 100 km N of Cruz Bay, U.S. Virgin Islands
  3. 3.7 90 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.7 76 km N of Culebra, Puerto Rico
  5. 3.5 78 km N of Culebra, Puerto Rico
  6. 3.5 71 km N of Culebra, Puerto Rico
  7. 3.3 72 km N of Culebra, Puerto Rico
  8. 3.4 70 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.4 67 km N of Culebra, Puerto Rico
  10. 3.3 71 km N of Culebra, Puerto Rico
  11. 3.7 73 km N of Culebra, Puerto Rico
  12. 3.4 74 km NNW of Charlotte Amalie, U.S. Virgin Islands
  13. 3.7 73 km N of Culebra, Puerto Rico
  14. 3.3 73 km N of Culebra, Puerto Rico
  15. 4.5 73 km N of Culebra, Puerto Rico

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 22 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.