132 km NNE of Vieques, Puerto Rico

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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 350,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
4. This earthquake M 3.0 about 950 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.4 on 2017-08-14 — about 130 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

1. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 48 km ESE of this epicentre Oct 17, 2001
2. 5.1 107 km N of Charlotte Amalie, U.S. Virgin Islands · 47 km ESE of this epicentre May 11, 1996
3. 5.1 122 km NNE of Vieques, Puerto Rico · 13 km SSE of this epicentre Sep 6, 2004
4. 5.1 92 km N of Suárez, Puerto Rico · 50 km SW of this epicentre Aug 14, 2009
5. 5.0 122 km N of Charlotte Amalie, U.S. Virgin Islands · 45 km E of this epicentre Mar 19, 1984

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 19.5271, -65.3463. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.9 135 km NNE of Vieques, Puerto Rico 00:50 UTC
2. 3.4 103 km N of Charlotte Amalie, U.S. Virgin Islands 17:31 UTC
3. 3.4 116 km N of Charlotte Amalie, U.S. Virgin Islands 16:20 UTC
4. 3.3 110 km N of Charlotte Amalie, U.S. Virgin Islands 06:23 UTC
5. 3.3 122 km N of Culebra, Puerto Rico 00:03 UTC
6. 3.4 139 km NNE of Vieques, Puerto Rico 20:23 UTC
7. 3.5 144 km NNW of Charlotte Amalie, U.S. Virgin Islands 02:39 UTC
8. 3.4 151 km N of Charlotte Amalie, U.S. Virgin Islands 11:42 UTC
9. 3.4 111 km N of Charlotte Amalie, U.S. Virgin Islands 13:23 UTC
10. 3.5 105 km N of Charlotte Amalie, U.S. Virgin Islands 22:35 UTC
11. 3.2 105 km N of Charlotte Amalie, U.S. Virgin Islands 23:38 UTC
12. 3.3 111 km NNW of Charlotte Amalie, U.S. Virgin Islands 22:25 UTC
13. 3.3 100 km NNW of Charlotte Amalie, U.S. Virgin Islands 06:35 UTC
14. 3.6 110 km N of Charlotte Amalie, U.S. Virgin Islands 21:52 UTC
15. 3.4 107 km NNW of Charlotte Amalie, U.S. Virgin Islands 17:50 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 00:35 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.