132 km N of Suárez, 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
4. This earthquake M 3.1 about 1,300 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.4× 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 19.6175, -65.7340. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 112 km N of San Juan, Puerto Rico 05:27 UTC
2. 3.2 105 km N of San Juan, Puerto Rico 16:35 UTC
3. 3.8 137 km NNE of Vieques, Puerto Rico 15:33 UTC
4. 3.6 105 km N of Suárez, Puerto Rico 11:44 UTC
5. 3.9 123 km N of Suárez, Puerto Rico 20:06 UTC
6. 3.6 123 km N of Suárez, Puerto Rico 19:18 UTC
7. 3.8 129 km NNE of Vieques, Puerto Rico 13:51 UTC
8. 3.6 108 km NNE of San Juan, Puerto Rico 04:03 UTC
9. 3.6 119 km N of San Juan, Puerto Rico 07:01 UTC
10. 3.8 127 km N of Suárez, Puerto Rico 16:37 UTC
11. 3.6 124 km N of Suárez, Puerto Rico 13:33 UTC
12. 3.6 118 km N of Suárez, Puerto Rico 00:51 UTC
13. 3.9 137 km NNE of Vieques, Puerto Rico 09:40 UTC
14. 3.7 111 km N of San Juan, Puerto Rico 01:53 UTC
15. 3.7 97 km N of San Juan, Puerto Rico 21:11 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:38 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 2023-02-28 — it released about 100 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.