150 km NNE of Cruz Bay, U.S. Virgin Islands

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 123 km (76 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 62 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 2,700× the energy of this one
2. Mineral, Virginia 2011 M 5.8 120× the energy of this one
3. Magna, Utah 2020 M 5.7 86× the energy of this one
4. This earthquake M 4.4 about 62 tons of TNT
5. Around the size people start to feel M 3.0 this one released 130× 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 2019-10-06 — about 6.7 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

1. 6.2 131 km NNE of Cruz Bay, U.S. Virgin Islands · 20 km S of this epicentre Sep 6, 1919
2. 5.0 122 km N of Charlotte Amalie, U.S. Virgin Islands · 49 km WSW of this epicentre Mar 19, 1984
3. 5.0 116 km N of Charlotte Amalie, U.S. Virgin Islands · 50 km SW of this epicentre Apr 5, 1984
4. 5.0 127 km NNE of Cruz Bay, U.S. Virgin Islands · 24 km S of this epicentre Jan 13, 1993

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 19.6656, -64.5113. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 120 km N of Cruz Bay, U.S. Virgin Islands 19:13 UTC
2. 3.4 116 km N of Charlotte Amalie, U.S. Virgin Islands 09:06 UTC
3. 3.7 130 km N of Charlotte Amalie, U.S. Virgin Islands 01:53 UTC
4. 3.7 119 km N of Charlotte Amalie, U.S. Virgin Islands 02:36 UTC
5. 3.5 136 km NNE of Cruz Bay, U.S. Virgin Islands 10:16 UTC
6. 3.7 132 km N of Charlotte Amalie, U.S. Virgin Islands 06:35 UTC
7. 3.1 122 km NNE of Cruz Bay, U.S. Virgin Islands 09:13 UTC
8. 3.7 135 km N of Charlotte Amalie, U.S. Virgin Islands 01:03 UTC
9. 3.8 118 km N of Cruz Bay, U.S. Virgin Islands 12:35 UTC
10. 3.8 141 km NNE of Cruz Bay, U.S. Virgin Islands 08:28 UTC
11. 3.5 152 km NNE of Cruz Bay, U.S. Virgin Islands 18:15 UTC
12. 3.4 153 km NNE of Cruz Bay, U.S. Virgin Islands 20:10 UTC
13. 3.8 140 km N of Cruz Bay, U.S. Virgin Islands 03:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 06:04 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.