QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

37 km NW of Charlotte Amalie, U.S. Virgin Islands

Yes. A magnitude 3.4 earthquake was recorded 37 km NW of Charlotte Amalie, U.S. Virgin Islands, 100 km (62 mi) ENE of San Juan, PR, at 8:01 pm AST on 21 May 2022 (00:01 UTC), 77 km deep.

100 km (62 mi) ENE of San Juan, PR

· 77 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 36 kmFajardo Municipio 53 kmVieques Municipio 62 kmCeiba Municipio 64 kmLuquillo Municipio 66 kmRío Grande Municipio 74 kmNaguabo Municipio 77 kmCanóvanas Municipio 84 kmHumacao Municipio 86 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 3.4 (md)
Depth
77 km below the surface
Felt
no reports yet
Nearest
Culebra Municipio, 36 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1562 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× 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 since 2016 was M 4.8 on 2021-03-09 — about 120 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.2 36 km NNE of Cruz Bay, U.S. Virgin Islands · 47 km E 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 18.6115, -65.1430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 36 km (22 mi) SSW earthquakes near Culebra Municipio
Fajardo Municipio, PR 53 km (33 mi) WSW earthquakes near Fajardo Municipio
Vieques Municipio, PR 62 km (39 mi) SSW earthquakes near Vieques Municipio
Ceiba Municipio, PR 64 km (40 mi) SW earthquakes near Ceiba Municipio
Luquillo Municipio, PR 66 km (41 mi) WSW earthquakes near Luquillo Municipio
Río Grande Municipio, PR 74 km (46 mi) WSW earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 3.4 25 km NNE of Cruz Bay, U.S. Virgin Islands
  2. 3.7 55 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.6 66 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.5 29 km NNE of Luquillo, Puerto Rico
  5. 3.4 69 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 3.4 72 km NNW of Charlotte Amalie, U.S. Virgin Islands
  7. 3.7 71 km NNW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.2 70 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 2.9 54 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.1 60 km N of Charlotte Amalie, U.S. Virgin Islands
  11. 3.6 Virgin Islands
  12. 3.4 46 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 3.0 31 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 3.2 56 km NNE of Luquillo, Puerto Rico
  15. 3.8 10 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.

On USGS

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