81 km ENE of Cruz Bay, U.S. Virgin Islands

2016-08-30 11:59 UTC · 35 km deep · released about 43 lb 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: 2016-08-30 11:59 UTC
Magnitude: M 2.1 (Md)
Depth: 35 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 3680 days ago · we first saw it 3680 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
Magna, Utah 2020 M 5.7 250,000× the energy of this one
Around the size people start to feel M 3.0 22× the energy of this one
This earthquake M 2.1 about 43 lb of TNT

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 18.6970, -64.1242. Map © OpenStreetMap contributors.

Aftershocks so far

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

2.8 81 km ENE of Cruz Bay, U.S. Virgin Islands 20:23 UTC
3.2 63 km NNE of Cruz Bay, U.S. Virgin Islands 18:51 UTC
2.2 72 km NE of Cruz Bay, U.S. Virgin Islands 11:01 UTC
2.3 60 km ENE of Cruz Bay, U.S. Virgin Islands 07:49 UTC
2.5 69 km NE of Cruz Bay, U.S. Virgin Islands 00:02 UTC
2.6 81 km NE of Cruz Bay, U.S. Virgin Islands 23:21 UTC
2.4 72 km NE of Cruz Bay, U.S. Virgin Islands 08:06 UTC
2.3 68 km ENE of Cruz Bay, U.S. Virgin Islands 13:09 UTC
2.2 75 km NNE of Cruz Bay, U.S. Virgin Islands 10:18 UTC
2.6 90 km ENE of Cruz Bay, U.S. Virgin Islands 02:36 UTC
2.0 64 km ENE of Cruz Bay, U.S. Virgin Islands 22:02 UTC
2.4 72 km NE of Cruz Bay, U.S. Virgin Islands 18:29 UTC
2.3 55 km NNE of Cruz Bay, U.S. Virgin Islands 16:21 UTC
3.0 59 km NE of Cruz Bay, U.S. Virgin Islands 17:28 UTC
2.3 73 km NE of Cruz Bay, U.S. Virgin Islands 04:39 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:23 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.