136 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 10 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 16,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 730× the energy of this one
3. Magna, Utah 2020 M 5.7 520× the energy of this one
4. This earthquake M 3.9 about 10 tons of TNT
5. Around the size people start to feel M 3.0 this one released 22× 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 19.6598, -65.7618. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.7 134 km N of San Juan, Puerto Rico 12:40 UTC
2. 3.6 Puerto Rico region 12:59 UTC
3. 3.3 134 km N of Suárez, Puerto Rico 11:05 UTC
4. 3.8 125 km N of Su?rez, Puerto Rico 23:02 UTC
5. 3.8 133 km N of Suárez, Puerto Rico 08:11 UTC
6. 3.9 129 km N of Suárez, Puerto Rico 06:34 UTC
7. 3.7 Puerto Rico region 02:22 UTC
8. 3.7 139 km N of Suárez, Puerto Rico 01:08 UTC
9. 3.8 136 km N of Suárez, Puerto Rico 23:59 UTC
10. 3.9 130 km N of Suárez, Puerto Rico 14:14 UTC
11. 3.7 136 km N of Suárez, Puerto Rico 04:23 UTC
12. 3.9 130 km N of Suárez, Puerto Rico 01:45 UTC
13. 2.5 123 km N of Suárez, Puerto Rico 01:19 UTC
14. 3.8 124 km N of Su?rez, Puerto Rico 01:01 UTC
15. 3.8 142 km N of Suárez, Puerto Rico 23:00 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:06 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 4.4 on 2023-02-28 — it released about 6.7 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.