QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0md

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

Yes. A magnitude 5.0 earthquake was recorded 90 km N of Charlotte Amalie, U.S. Virgin Islands, at 3:05 am AST on 6 February 2021 (07:05 UTC), 78 km deep. 62 people have reported feeling it to USGS.

· 78 km deep · released about 460 tons of TNT

10 km30 km60 km120 km N Culebra Municipio 106 kmFajardo Municipio 118 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 5.0 (md)
Depth
78 km below the surface
Felt
62 reports · strongest reported intensity IV
Nearest
Culebra Municipio, 106 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 324 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 175 km (109 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 460 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 370× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
  3. Magna, Utah 2020 M 5.7 12× the energy of this one
  4. This earthquake M 5.0 about 460 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 970× 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.

For this area

The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. The previous largest was M 4.8 on 2019-02-18.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 131 km NNE of Cruz Bay, U.S. Virgin Islands · 50 km NE of this epicentre
  2. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 2 km WNW of this epicentre
  3. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 25 km NNW of this epicentre
  4. 5.9 68 km N of Cruz Bay, U.S. Virgin Islands · 26 km SSE of this epicentre
  5. 5.9 65 km NNE of Cruz Bay, U.S. Virgin Islands · 39 km SE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 19.1560, -64.8158. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 106 km (66 mi) SSW earthquakes near Culebra Municipio
Fajardo Municipio, PR 118 km (73 mi) SW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 129 km (80 mi) SW earthquakes near Luquillo Municipio
Ceiba Municipio, PR 131 km (82 mi) SW earthquakes near Ceiba Municipio
Vieques Municipio, PR 132 km (82 mi) SSW earthquakes near Vieques Municipio
Río Grande Municipio, PR 135 km (84 mi) SW earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.2 92 km N of Culebra, Puerto Rico
  2. 3.4 116 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.6 88 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 4.0 124 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.5 100 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.6 89 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.8 93 km NNE of Cruz Bay, U.S. Virgin Islands
  8. 3.7 92 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.5 96 km N of Cruz Bay, U.S. Virgin Islands
  10. 3.7 83 km N of Cruz Bay, U.S. Virgin Islands
  11. 3.6 106 km N of Cruz Bay, U.S. Virgin Islands
  12. 3.6 77 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 3.3 66 km NNW of Charlotte Amalie, U.S. Virgin Islands
  14. 3.8 89 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 3.3 63 km N of Charlotte Amalie, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.