134 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 9.6 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 18,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 790× the energy of this one
3. Magna, Utah 2020 M 5.7 560× the energy of this one
4. This earthquake M 3.9 about 9.6 tons of TNT
5. Around the size people start to feel M 3.0 this one released 20× 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 19.5676, -65.3883. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.7 135 km N of Suárez, Puerto Rico 02:03 UTC
2. 3.8 141 km N of Suárez, Puerto Rico 06:43 UTC
3. 3.7 137 km N of Suárez, Puerto Rico 04:21 UTC
4. 3.8 132 km N of Suárez, Puerto Rico 09:44 UTC
5. 3.8 140 km N of Suárez, Puerto Rico 23:16 UTC
6. 3.2 94 km N of Culebra, Puerto Rico 22:34 UTC
7. 3.4 Puerto Rico region 12:48 UTC
8. 3.9 Puerto Rico region 07:31 UTC
9. 3.9 Puerto Rico region 08:45 UTC
10. 3.8 143 km N of Suárez, Puerto Rico 05:43 UTC
11. 4.0 133 km N of Suárez, Puerto Rico 02:33 UTC
12. 4.0 138 km N of Suárez, Puerto Rico 09:05 UTC
13. 3.7 135 km N of Suárez, Puerto Rico 18:14 UTC
14. 3.4 134 km N of Suárez, Puerto Rico 22:31 UTC
15. 3.7 141 km NNE of Vieques, Puerto Rico 21:00 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:06 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 35 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.