Puerto Rico region

Yes. A magnitude 3.1 earthquake was recorded in the Puerto Rico region, at 9:37 am AST on 5 October 2018 (13:37 UTC), 46 km deep.

2018-10-05 13:37 UTC · 46 km deep · released about 1,500 lb of TNT

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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: 2018-10-05 13:37 UTC
Magnitude: M 3.1 (md)
Depth: 46 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2889 days ago · we first saw it 2889 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 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

Northridge, California 1994 M 6.7 220,000× the energy of this one
Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
Magna, Utah 2020 M 5.7 6,900× the energy of this one
This earthquake M 3.1 about 1,500 lb of TNT
Around the size people start to feel M 3.0 this one released 1.6× 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 4.5 on 2018-03-06 — about 110 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

Map loads when it scrolls into view

Aftershocks so far

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

3.2 Puerto Rico region 23:56 UTC
3.1 116 km NNE of Vieques, Puerto Rico 20:23 UTC
3.2 Puerto Rico region 04:14 UTC
3.4 123 km NNE of Suárez, Puerto Rico 03:27 UTC
2.9 144 km NNE of Suárez, Puerto Rico 03:16 UTC
3.3 139 km NNE of Suárez, Puerto Rico 01:22 UTC
2.9 131 km NNE of Vieques, Puerto Rico 02:49 UTC
2.3 102 km NNE of Vieques, Puerto Rico 14:33 UTC
3.4 160 km NNE of Vieques, Puerto Rico 08:17 UTC
3.2 109 km N of Charlotte Amalie, U.S. Virgin Islands 02:10 UTC
3.0 113 km N of Charlotte Amalie, U.S. Virgin Islands 03:45 UTC
2.8 129 km NNE of Vieques, Puerto Rico 09:22 UTC
3.1 Puerto Rico region 05:06 UTC
2.8 113 km NNE of Vieques, Puerto Rico 04:10 UTC
3.2 140 km NNW of Charlotte Amalie, U.S. Virgin Islands 22:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:37 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.