69 km N of Cruz Bay, 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 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 610 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 25,000× the energy of this one
2. Magna, Utah 2020 M 5.7 18,000× the energy of this one
3. Around the size people start to feel M 3.0 1.6× the energy of this one
4. This earthquake M 2.9 about 610 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 4.7 on 2018-04-06 — about 560 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. 6.1 91 km N of Charlotte Amalie, U.S. Virgin Islands · 27 km NNW of this epicentre Oct 11, 2008
2. 5.9 68 km N of Cruz Bay, U.S. Virgin Islands · 1 km SSE of this epicentre Jun 25, 1930
3. 5.9 65 km NNE of Cruz Bay, U.S. Virgin Islands · 15 km ESE of this epicentre Jun 26, 1985
4. 5.7 80 km NNE of Cruz Bay, U.S. Virgin Islands · 16 km ENE of this epicentre Aug 2, 1927
5. 5.6 112 km N of Charlotte Amalie, U.S. Virgin Islands · 49 km NNW of this epicentre Oct 16, 2001

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 18.9526, -64.7056. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.8 108 km N of Charlotte Amalie, U.S. Virgin Islands 05:11 UTC
2. 2.5 108 km N of Charlotte Amalie, U.S. Virgin Islands 05:51 UTC
3. 2.8 71 km N of Charlotte Amalie, U.S. Virgin Islands 04:58 UTC
4. 3.4 101 km N of Charlotte Amalie, U.S. Virgin Islands 20:32 UTC
5. 3.5 75 km NE of Cruz Bay, U.S. Virgin Islands 07:41 UTC
6. 3.4 97 km NNE of Cruz Bay, U.S. Virgin Islands 17:31 UTC
7. 3.3 113 km NNE of Cruz Bay, U.S. Virgin Islands 12:36 UTC
8. 2.8 62 km N of Cruz Bay, U.S. Virgin Islands 01:53 UTC
9. 3.2 57 km NE of Cruz Bay, U.S. Virgin Islands 02:25 UTC
10. 3.4 104 km NNE of Cruz Bay, U.S. Virgin Islands 13:55 UTC
11. 3.5 65 km N of Charlotte Amalie, U.S. Virgin Islands 06:00 UTC
12. 3.1 74 km NNW of Charlotte Amalie, U.S. Virgin Islands 19:52 UTC
13. 2.8 63 km NNE of Cruz Bay, U.S. Virgin Islands 06:05 UTC
14. 3.2 68 km NE of Cruz Bay, U.S. Virgin Islands 04:56 UTC
15. 3.4 60 km NE of Cruz Bay, U.S. Virgin Islands 18:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:35 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.