QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Virgin Islands

Yes. A magnitude 3.3 earthquake was recorded in the Virgin Islands, at 11:21 pm AST on 10 August 2022 (03:21 UTC), 12 km deep. 1 person has reported feeling it to USGS.

· 12 km deep · released about 1.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Culebra Municipio 41 kmVieques Municipio 47 kmCeiba Municipio 69 kmFajardo Municipio 70 kmNaguabo Municipio 80 kmLuquillo Municipio 81 kmHumacao Municipio 85 kmRío Grande Municipio 90 kmYabucoa Municipio 93 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 3.3 (md)
Depth
12 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Culebra Municipio, 41 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1553 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, people at rest would likely notice it out to about 48 km (30 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.

Likely felt in: Culebra 39 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 150,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,700× the energy of this one
  4. This earthquake M 3.3 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.4× 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 in our catalogue was M 4.8 on 2021-10-08 — about 210 times the energy of this one.

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 18.1240, -64.9865. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Culebra Municipio, PR 41 km (25 mi) WNW earthquakes near Culebra Municipio
Vieques Municipio, PR 47 km (29 mi) W earthquakes near Vieques Municipio
Ceiba Municipio, PR 69 km (43 mi) WNW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 70 km (43 mi) WNW earthquakes near Fajardo Municipio
Naguabo Municipio, PR 80 km (50 mi) W earthquakes near Naguabo Municipio
Luquillo Municipio, PR 81 km (50 mi) WNW earthquakes near Luquillo Municipio

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

Aftershocks so far

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

  1. 3.1 15 km SE of Esperanza, Puerto Rico
  2. 3.2 22 km SSE of Esperanza, Puerto Rico
  3. 4.0 12 km S of Cruz Bay, U.S. Virgin Islands
  4. 2.6 10 km ESE of Esperanza, Puerto Rico
  5. 3.3 28 km S of Charlotte Amalie, U.S. Virgin Islands
  6. 3.9 18 km SE of Culebra, Puerto Rico
  7. 2.7 37 km SSW of Charlotte Amalie, U.S. Virgin Islands
  8. 3.2 2 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.1 23 km N of Cruz Bay, U.S. Virgin Islands
  10. 2.9 33 km NW of Saint Croix, U.S. Virgin Islands
  11. 2.6 25 km NNW of Charlotte Amalie, U.S. Virgin Islands
  12. 3.0 33 km SSW of Charlotte Amalie, U.S. Virgin Islands
  13. 2.7 9 km S of Culebra, Puerto Rico
  14. 3.2 Virgin Islands
  15. 2.9 11 km WNW 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.

On USGS

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