125 km NNE of San Juan, 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 7.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 23,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
3. Magna, Utah 2020 M 5.7 730× the energy of this one
4. This earthquake M 3.8 about 7.3 tons of TNT
5. Around the size people start to feel M 3.0 this one released 15× 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 19.5706, -65.8431. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 146 km NNE of Vieques, Puerto Rico 16:09 UTC
2. 3.9 134 km NNE of Vieques, Puerto Rico 12:19 UTC
3. 3.9 Puerto Rico region 01:09 UTC
4. 3.3 131 km NNE of Vieques, Puerto Rico 16:34 UTC
5. 3.5 132 km NNE of Vieques, Puerto Rico 12:27 UTC
6. 3.6 Puerto Rico region 11:17 UTC
7. 3.4 Puerto Rico region 23:18 UTC
8. 3.7 114 km N of Suárez, Puerto Rico 05:38 UTC
9. 3.6 78 km NNE of San Juan, Puerto Rico 22:36 UTC
10. 3.6 135 km N of Suárez, Puerto Rico 23:09 UTC
11. 3.2 94 km NNE of San Juan, Puerto Rico 23:01 UTC
12. 3.4 124 km N of Brenas, Puerto Rico 20:16 UTC
13. 3.9 107 km NNE of San Juan, Puerto Rico 08:22 UTC
14. 3.9 88 km N of Suárez, Puerto Rico 06:39 UTC
15. 3.9 123 km N of Suárez, Puerto Rico 06:37 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:24 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 4.4 on 2016-10-23 — it released about 8.2 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.