143 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 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 19.6040, -65.2691. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.7 132 km NNE of Vieques, Puerto Rico 05:37 UTC
2. 3.4 122 km N of Charlotte Amalie, U.S. Virgin Islands 08:49 UTC
3. 3.4 102 km NNW of Charlotte Amalie, U.S. Virgin Islands 13:07 UTC
4. 3.6 126 km N of Charlotte Amalie, U.S. Virgin Islands 15:07 UTC
5. 3.4 112 km N of Charlotte Amalie, U.S. Virgin Islands 21:06 UTC
6. 3.3 105 km N of Charlotte Amalie, U.S. Virgin Islands 19:48 UTC
7. 3.4 114 km N of Charlotte Amalie, U.S. Virgin Islands 19:46 UTC
8. 3.3 116 km N of Charlotte Amalie, U.S. Virgin Islands 19:37 UTC
9. 3.5 96 km N of Charlotte Amalie, U.S. Virgin Islands 06:39 UTC
10. 3.8 104 km NNW of Charlotte Amalie, U.S. Virgin Islands 06:09 UTC
11. 3.6 116 km NNW of Charlotte Amalie, U.S. Virgin Islands 16:15 UTC
12. 3.7 107 km N of Charlotte Amalie, U.S. Virgin Islands 23:44 UTC
13. 3.7 122 km N of Culebra, Puerto Rico 07:05 UTC
14. 3.3 146 km N of Charlotte Amalie, U.S. Virgin Islands 17:21 UTC
15. 3.4 133 km NNE of Vieques, Puerto Rico 08:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:01 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 29 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.