131 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 9.3 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 18,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 810× the energy of this one
3. Magna, Utah 2020 M 5.7 580× the energy of this one
4. This earthquake M 3.9 about 9.3 tons of TNT
5. Around the size people start to feel M 3.0 this one released 19× 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 19.5216, -64.7276. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 4.0 172 km N of Cruz Bay, U.S. Virgin Islands 00:57 UTC
2. 3.9 152 km N of Cruz Bay, U.S. Virgin Islands 03:55 UTC
3. 3.8 104 km N of Cruz Bay, U.S. Virgin Islands 02:18 UTC
4. 3.9 101 km N of Cruz Bay, U.S. Virgin Islands 07:19 UTC
5. 3.7 88 km NNE of Cruz Bay, U.S. Virgin Islands 09:36 UTC
6. 3.3 102 km NNE of Cruz Bay, U.S. Virgin Islands 18:35 UTC
7. 3.9 114 km N of Charlotte Amalie, U.S. Virgin Islands 13:59 UTC
8. 4.0 152 km N of Cruz Bay, U.S. Virgin Islands 23:51 UTC
9. 4.0 154 km NNE of Cruz Bay, U.S. Virgin Islands 06:40 UTC
10. 3.7 154 km NNE of Cruz Bay, U.S. Virgin Islands 06:28 UTC
11. 3.8 134 km NNE of Cruz Bay, U.S. Virgin Islands 09:44 UTC
12. 3.6 165 km NNE of Cruz Bay, U.S. Virgin Islands 08:24 UTC
13. 3.9 163 km NNE of Cruz Bay, U.S. Virgin Islands 08:09 UTC
14. 3.7 115 km N of Charlotte Amalie, U.S. Virgin Islands 09:49 UTC
15. 3.6 153 km NNE of Cruz Bay, U.S. Virgin Islands 20:43 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:26 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 2021-02-06 — it released about 50 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.