65 km N of Charlotte Amalie, U.S. Virgin Islands

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 42 km (26 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 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 210,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
4. This earthquake M 3.1 about 1,600 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.7× 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 since 2016 was M 5.0 on 2021-02-06 — about 580 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

1. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 28 km NNE of this epicentre Oct 11, 2008
2. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 47 km N of this epicentre Oct 17, 2001
3. 5.9 68 km N of Cruz Bay, U.S. Virgin Islands · 26 km E of this epicentre Jun 25, 1930
4. 5.9 65 km NNE of Cruz Bay, U.S. Virgin Islands · 40 km E of this epicentre Jun 26, 1985
5. 5.7 80 km NNE of Cruz Bay, U.S. Virgin Islands · 41 km ENE of this epicentre Aug 2, 1927

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 18.9352, -64.9552. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 3.4 109 km N of Charlotte Amalie, U.S. Virgin Islands 06:45 UTC
2. 3.2 92 km N of Charlotte Amalie, U.S. Virgin Islands 18:09 UTC
3. 3.4 106 km N of Cruz Bay, U.S. Virgin Islands 04:29 UTC
4. 3.2 57 km N of Charlotte Amalie, U.S. Virgin Islands 20:52 UTC
5. 3.4 106 km NNW of Charlotte Amalie, U.S. Virgin Islands 14:13 UTC
6. 3.2 76 km N of Culebra, Puerto Rico 08:56 UTC
7. 3.1 71 km N of Charlotte Amalie, U.S. Virgin Islands 04:05 UTC
8. 3.4 23 km NW of Charlotte Amalie, U.S. Virgin Islands 02:48 UTC
9. 3.2 83 km N of Charlotte Amalie, U.S. Virgin Islands 05:52 UTC
10. 3.2 104 km NNW of Charlotte Amalie, U.S. Virgin Islands 17:33 UTC
11. 3.2 89 km N of Cruz Bay, U.S. Virgin Islands 21:55 UTC
12. 3.3 81 km N of Charlotte Amalie, U.S. Virgin Islands 02:53 UTC
13. 3.4 105 km N of Charlotte Amalie, U.S. Virgin Islands 21:35 UTC
14. 3.4 89 km N of Cruz Bay, U.S. Virgin Islands 16:15 UTC
15. 2.9 45 km N of Charlotte Amalie, U.S. Virgin Islands 06:43 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:23 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.