141 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 10 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 17,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 760× the energy of this one
3. Magna, Utah 2020 M 5.7 540× the energy of this one
4. This earthquake M 3.9 about 10 tons of TNT
5. Around the size people start to feel M 3.0 this one released 21× 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 19.5900, -65.2768. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.7 119 km NNW of Charlotte Amalie, U.S. Virgin Islands 09:35 UTC
2. 3.7 135 km NNE of Vieques, Puerto Rico 06:57 UTC
3. 3.8 150 km NNE of Vieques, Puerto Rico 04:00 UTC
4. 3.6 127 km N of Culebra, Puerto Rico 03:57 UTC
5. 3.4 109 km N of Charlotte Amalie, U.S. Virgin Islands 08:08 UTC
6. 3.6 125 km NNE of Vieques, Puerto Rico 18:02 UTC
7. 4.3 144 km NNE of Vieques, Puerto Rico 12:58 UTC
8. 4.0 139 km NNE of Vieques, Puerto Rico 08:39 UTC
9. 4.0 136 km NNW of Charlotte Amalie, U.S. Virgin Islands 21:27 UTC
10. 4.0 170 km NNE of Suárez, Puerto Rico 00:15 UTC
11. 3.4 151 km NNE of Vieques, Puerto Rico 18:02 UTC
12. 3.8 134 km NNE of Vieques, Puerto Rico 00:43 UTC
13. 3.6 165 km N of Suárez, Puerto Rico 19:50 UTC
14. 3.8 162 km N of Suárez, Puerto Rico 15:47 UTC
15. 3.4 105 km N of Culebra, Puerto Rico 04:46 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:49 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 34 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.