88 km N of Culebra, 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, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. 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 830 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 6.7 410,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 18,000× the energy of this one
3. Magna, Utah 2020 M 5.7 13,000× the energy of this one
4. This earthquake M 3.0 about 830 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 5.0 on 2021-02-06 — about 1,100 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

1. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 40 km E of this epicentre Oct 11, 2008
2. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 41 km NE of this epicentre Oct 17, 2001
3. 5.6 112 km N of Charlotte Amalie, U.S. Virgin Islands · 45 km NE of this epicentre Oct 16, 2001
4. 5.1 107 km N of Charlotte Amalie, U.S. Virgin Islands · 36 km NE of this epicentre May 11, 1996
5. 5.1 122 km NNE of Vieques, Puerto Rico · 37 km NNW of this epicentre Sep 6, 2004

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 19.0942, -65.2110. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 3.3 92 km N of Charlotte Amalie, U.S. Virgin Islands 01:20 UTC
2. 3.4 89 km N of Charlotte Amalie, U.S. Virgin Islands 00:12 UTC
3. 3.4 83 km N of Cruz Bay, U.S. Virgin Islands 20:13 UTC
4. 3.7 123 km NNE of Vieques, Puerto Rico 07:06 UTC
5. 3.7 126 km N of Charlotte Amalie, U.S. Virgin Islands 06:53 UTC
6. 3.6 133 km N of Culebra, Puerto Rico 04:40 UTC
7. 3.7 128 km N of Culebra, Puerto Rico 00:34 UTC
8. 3.8 130 km NNE of Vieques, Puerto Rico 23:04 UTC
9. 3.1 68 km NNE of Vieques, Puerto Rico 09:00 UTC
10. 3.8 130 km NNE of Vieques, Puerto Rico 00:06 UTC
11. 3.4 84 km N of Charlotte Amalie, U.S. Virgin Islands 23:41 UTC
12. 3.7 87 km NNE of Vieques, Puerto Rico 12:02 UTC
13. 3.7 86 km NNE of Vieques, Puerto Rico 11:09 UTC
14. 3.1 52 km NNW of Charlotte Amalie, U.S. Virgin Islands 03:39 UTC
15. 3.6 75 km N of Cruz Bay, U.S. Virgin Islands 02:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:15 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.