128 km NNE of Cruz Bay, U.S. Virgin Islands

2023-10-10 09:48 UTC · 45 km deep · released about 11 tons of TNT

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: 2023-10-10 09:48 UTC
Magnitude: M 3.9 (md)
Depth: 45 km below the surface
Felt: no reports yet
Nearest: Culebra Municipio, 160 km SW
Status: Reviewed by a seismologist

USGS · last changed by USGS 1016 days ago · we first saw it 1016 days ago

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

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

Northridge, California 1994 M 6.7 15,000× the energy of this one
Mineral, Virginia 2011 M 5.8 680× the energy of this one
Magna, Utah 2020 M 5.7 480× the energy of this one
This earthquake M 3.9 about 11 tons of TNT
Around the size people start to feel M 3.0 this one released 23× 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

Map loads when it scrolls into view

Epicentre 19.3806, -64.2715. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Culebra Municipio, PR	160 km (99 mi)	NE of here	earthquakes near Culebra Municipio

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

Aftershocks so far

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

3.4 143 km NNE of Cruz Bay, U.S. Virgin Islands 22:57 UTC
3.8 101 km N of Cruz Bay, U.S. Virgin Islands 04:19 UTC
3.7 103 km N of Cruz Bay, U.S. Virgin Islands 17:04 UTC
3.8 105 km N of Cruz Bay, U.S. Virgin Islands 22:40 UTC
3.7 88 km NNE of Cruz Bay, U.S. Virgin Islands 09:36 UTC
3.3 102 km NNE of Cruz Bay, U.S. Virgin Islands 18:35 UTC
3.5 83 km NNE of Cruz Bay, U.S. Virgin Islands 11:11 UTC
4.0 152 km N of Cruz Bay, U.S. Virgin Islands 23:51 UTC
4.0 154 km NNE of Cruz Bay, U.S. Virgin Islands 06:40 UTC
3.7 154 km NNE of Cruz Bay, U.S. Virgin Islands 06:28 UTC
3.8 134 km NNE of Cruz Bay, U.S. Virgin Islands 09:44 UTC
3.9 163 km NNE of Cruz Bay, U.S. Virgin Islands 08:09 UTC
3.7 168 km NNE of Cruz Bay, U.S. Virgin Islands 21:44 UTC
3.6 153 km NNE of Cruz Bay, U.S. Virgin Islands 20:43 UTC
3.9 149 km N of Cruz Bay, U.S. Virgin Islands 12:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:36 UTC. 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 5.5 on 2022-05-08 — it released about 240 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

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