152 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.

How big was it?

This earthquake released about 12 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 14,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 640× the energy of this one
3. Magna, Utah 2020 M 5.7 450× the energy of this one
4. This earthquake M 3.9 about 12 tons of TNT
5. Around the size people start to feel M 3.0 this one released 25× 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.

Where

Epicentre 19.7045, -64.6471. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.7 138 km N of Cruz Bay, U.S. Virgin Islands 06:24 UTC
2. 4.0 154 km N of Cruz Bay, U.S. Virgin Islands 06:20 UTC
3. 4.2 150 km NNE of Cruz Bay, U.S. Virgin Islands 05:07 UTC
4. 3.3 108 km NNE of Cruz Bay, U.S. Virgin Islands 01:53 UTC
5. 3.8 132 km N of Cruz Bay, U.S. Virgin Islands 10:28 UTC
6. 3.7 120 km N of Cruz Bay, U.S. Virgin Islands 23:27 UTC
7. 3.8 148 km NNE of Cruz Bay, U.S. Virgin Islands 17:34 UTC
8. 4.0 150 km NNE of Cruz Bay, U.S. Virgin Islands 20:10 UTC
9. 3.9 156 km N of Cruz Bay, U.S. Virgin Islands 19:05 UTC
10. 3.9 158 km NNE of Cruz Bay, U.S. Virgin Islands 02:04 UTC
11. 3.7 139 km N of Charlotte Amalie, U.S. Virgin Islands 02:41 UTC
12. 3.9 135 km NNE of Cruz Bay, U.S. Virgin Islands 15:51 UTC
13. 3.8 164 km N of Cruz Bay, U.S. Virgin Islands 20:28 UTC
14. 3.7 107 km N of Cruz Bay, U.S. Virgin Islands 12:25 UTC
15. 3.4 121 km N of Charlotte Amalie, U.S. Virgin Islands 01:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:26 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2019-10-06 — it released about 35 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.