135 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 67 km (42 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 4.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 35,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
3. Magna, Utah 2020 M 5.7 1,100× the energy of this one
4. This earthquake M 3.7 about 4.8 tons of TNT
5. Around the size people start to feel M 3.0 this one released 10× 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 95 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

1. 6.2 131 km NNE of Cruz Bay, U.S. Virgin Islands · 29 km ESE of this epicentre Sep 6, 1919
2. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 45 km S of this epicentre Oct 11, 2008
3. 6.0 112 km N of Charlotte Amalie, U.S. Virgin Islands · 28 km SW of this epicentre Oct 17, 2001
4. 5.6 112 km N of Charlotte Amalie, U.S. Virgin Islands · 26 km SSW of this epicentre Oct 16, 2001
5. 5.3 97 km N of Cruz Bay, U.S. Virgin Islands · 42 km SSE of this epicentre Dec 19, 2007

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 19.5603, -64.7715. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 126 km NNW of Charlotte Amalie, U.S. Virgin Islands 12:37 UTC
2. 3.4 120 km N of Cruz Bay, U.S. Virgin Islands 19:13 UTC
3. 3.4 117 km N of Charlotte Amalie, U.S. Virgin Islands 22:12 UTC
4. 3.4 102 km N of Charlotte Amalie, U.S. Virgin Islands 02:47 UTC
5. 3.2 89 km N of Cruz Bay, U.S. Virgin Islands 22:40 UTC
6. 3.3 96 km N of Cruz Bay, U.S. Virgin Islands 11:44 UTC
7. 3.4 116 km N of Charlotte Amalie, U.S. Virgin Islands 09:06 UTC
8. 3.7 130 km N of Charlotte Amalie, U.S. Virgin Islands 01:53 UTC
9. 3.4 109 km N of Charlotte Amalie, U.S. Virgin Islands 13:31 UTC
10. 3.4 104 km N of Charlotte Amalie, U.S. Virgin Islands 02:41 UTC
11. 3.7 119 km N of Charlotte Amalie, U.S. Virgin Islands 02:36 UTC
12. 3.5 136 km NNE of Cruz Bay, U.S. Virgin Islands 10:16 UTC
13. 3.5 106 km N of Charlotte Amalie, U.S. Virgin Islands 08:08 UTC
14. 3.7 132 km N of Charlotte Amalie, U.S. Virgin Islands 06:35 UTC
15. 3.1 122 km NNE of Cruz Bay, U.S. Virgin Islands 09:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:39 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.