144 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 3.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 50,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
4. This earthquake M 3.6 about 3.4 tons of TNT
5. Around the size people start to feel M 3.0 this one released 7.2× 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 19.6223, -65.2943. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 106 km NNE of Vieques, Puerto Rico 01:59 UTC
2. 3.3 99 km N of Culebra, Puerto Rico 05:59 UTC
3. 3.9 143 km NNE of Vieques, Puerto Rico 01:40 UTC
4. 3.7 147 km N of Charlotte Amalie, U.S. Virgin Islands 18:17 UTC
5. 3.8 113 km NNE of Vieques, Puerto Rico 11:28 UTC
6. 3.4 137 km NNE of Vieques, Puerto Rico 10:16 UTC
7. 3.7 119 km NNW of Charlotte Amalie, U.S. Virgin Islands 09:35 UTC
8. 3.7 135 km NNE of Vieques, Puerto Rico 06:57 UTC
9. 3.8 150 km NNE of Vieques, Puerto Rico 04:00 UTC
10. 3.6 127 km N of Culebra, Puerto Rico 03:57 UTC
11. 3.4 109 km N of Charlotte Amalie, U.S. Virgin Islands 08:08 UTC
12. 3.6 125 km NNE of Vieques, Puerto Rico 18:02 UTC
13. 4.3 144 km NNE of Vieques, Puerto Rico 12:58 UTC
14. 4.0 139 km NNE of Vieques, Puerto Rico 08:39 UTC
15. 4.0 136 km NNW of Charlotte Amalie, U.S. Virgin Islands 21:27 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:06 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 99 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.