36 km E of Cruz Bay, U.S. Virgin Islands

2023-09-10 08:50 UTC · 137 km deep · released about 18 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: 2023-09-10 08:50 UTC
Magnitude: M 4.0 (md)
Depth: 137 km below the surface
Felt: 1 report · strongest reported intensity II
Nearest: Culebra Municipio, 91 km W
Status: Reviewed by a seismologist

USGS · last changed by USGS 1044 days ago · we first saw it 1044 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 18 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 9,400× the energy of this one
Mineral, Virginia 2011 M 5.8 420× the energy of this one
Magna, Utah 2020 M 5.7 300× the energy of this one
This earthquake M 4.0 about 18 tons of TNT
Around the size people start to feel M 3.0 this one released 38× 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 18.3890, -64.4510. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Culebra Municipio, PR	91 km (56 mi)	E of here	earthquakes near Culebra Municipio
Vieques Municipio, PR	108 km (67 mi)	ENE of here	earthquakes near Vieques Municipio

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

Aftershocks so far

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

3.6 65 km NE of Cruz Bay, U.S. Virgin Islands 12:05 UTC
3.0 66 km NE of Christiansted, U.S. Virgin Islands 18:44 UTC
3.2 57 km NNE of Cruz Bay, U.S. Virgin Islands 16:47 UTC
3.6 21 km NE of Cruz Bay, U.S. Virgin Islands 03:11 UTC
2.8 44 km NE of Cruz Bay, U.S. Virgin Islands 14:53 UTC
2.9 56 km NE of Cruz Bay, U.S. Virgin Islands 14:42 UTC
3.3 45 km NNE of Cruz Bay, U.S. Virgin Islands 21:49 UTC
3.4 69 km NE of Cruz Bay, U.S. Virgin Islands 04:13 UTC
3.3 34 km NNE of Christiansted, U.S. Virgin Islands 13:29 UTC
3.1 63 km NE of Cruz Bay, U.S. Virgin Islands 10:17 UTC
3.7 45 km E of Cruz Bay, U.S. Virgin Islands 06:00 UTC
3.6 10 km SW of Cruz Bay, U.S. Virgin Islands 08:17 UTC
3.0 74 km ENE of Cruz Bay, U.S. Virgin Islands 07:01 UTC
3.6 41 km NNE of Cruz Bay, U.S. Virgin Islands 02:45 UTC
3.4 64 km NE of Cruz Bay, U.S. Virgin Islands 12:27 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:42 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 5.4 on 2021-01-24 — it released about 110 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.