160 km NNE of Vieques, Puerto Rico

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 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 83,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
4. This earthquake M 3.4 about 2 tons of TNT
5. Around the size people start to feel M 3.0 this one released 4.3× 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 19.7621, -65.2443. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.5 138 km N of Charlotte Amalie, U.S. Virgin Islands 23:20 UTC
2. 2.7 115 km NNE of Vieques, Puerto Rico 04:25 UTC
3. 3.4 156 km N of Charlotte Amalie, U.S. Virgin Islands 14:26 UTC
4. 2.8 163 km N of Charlotte Amalie, U.S. Virgin Islands 05:48 UTC
5. 3.2 173 km N of Charlotte Amalie, U.S. Virgin Islands 04:18 UTC
6. 2.9 124 km N of Charlotte Amalie, U.S. Virgin Islands 07:40 UTC
7. 3.3 121 km NNE of Suárez, Puerto Rico 05:47 UTC
8. 3.0 133 km NNW of Charlotte Amalie, U.S. Virgin Islands 03:35 UTC
9. 3.1 134 km N of Charlotte Amalie, U.S. Virgin Islands 06:44 UTC
10. 3.7 124 km NNW of Charlotte Amalie, U.S. Virgin Islands 05:41 UTC
11. 3.8 136 km N of Charlotte Amalie, U.S. Virgin Islands 07:21 UTC
12. 3.0 118 km N of Charlotte Amalie, U.S. Virgin Islands 00:13 UTC
13. 3.2 147 km N of Charlotte Amalie, U.S. Virgin Islands 04:35 UTC
14. 3.4 132 km N of Charlotte Amalie, U.S. Virgin Islands 01:52 UTC
15. 3.4 141 km NNE of Vieques, Puerto Rico 01:04 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:01 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 4.9 on 2018-11-14 — it released about 170 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.