Puerto Rico region

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 1.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 100,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 4,600× the energy of this one
3. Magna, Utah 2020 M 5.7 3,200× the energy of this one
4. This earthquake M 3.4 about 1.7 tons of TNT
5. Around the size people start to feel M 3.0 this one released 3.5× 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 19.6125, -65.3562. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.8 149 km N of Suárez, Puerto Rico 07:50 UTC
2. 3.7 135 km N of Suárez, Puerto Rico 12:59 UTC
3. 3.4 106 km NNE of Suárez, Puerto Rico 13:45 UTC
4. 3.7 149 km N of Suárez, Puerto Rico 01:27 UTC
5. 3.8 135 km N of Suárez, Puerto Rico 23:06 UTC
6. 3.8 135 km N of Suárez, Puerto Rico 05:38 UTC
7. 3.8 124 km N of Suárez, Puerto Rico 01:16 UTC
8. 3.8 123 km N of Suárez, Puerto Rico 01:13 UTC
9. 3.6 Puerto Rico region 00:30 UTC
10. 4.0 112 km N of Suárez, Puerto Rico 00:26 UTC
11. 3.7 135 km N of Suárez, Puerto Rico 02:03 UTC
12. 3.8 141 km N of Suárez, Puerto Rico 06:43 UTC
13. 3.7 137 km N of Suárez, Puerto Rico 04:21 UTC
14. 3.8 132 km N of Suárez, Puerto Rico 09:44 UTC
15. 3.8 140 km N of Suárez, Puerto Rico 23:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:32 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 200 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.