133 km NNW of San Antonio, 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 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 310,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 14,000× the energy of this one
3. Magna, Utah 2020 M 5.7 9,800× the energy of this one
4. This earthquake M 3.0 about 1,100 lb of TNT

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 19.5985, -67.6060. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.1 117 km NE of Punta Cana, Dominican Republic 20:16 UTC
2. 2.6 92 km NNE of Punta Cana, Dominican Republic 04:42 UTC
3. 3.0 106 km NE of Punta Cana, Dominican Republic 06:35 UTC
4. 2.7 108 km NNW of San Antonio, Puerto Rico 09:40 UTC
5. 2.5 89 km NNW of San Antonio, Puerto Rico 09:35 UTC
6. 3.2 119 km NNW of San Antonio, Puerto Rico 20:33 UTC
7. 3.1 100 km NNW of San Antonio, Puerto Rico 13:33 UTC
8. 3.0 99 km NE of Punta Cana, Dominican Republic 09:55 UTC
9. 3.4 108 km NNE of Punta Cana, Dominican Republic 08:26 UTC
10. 3.3 99 km N of San Antonio, Puerto Rico 17:31 UTC
11. 3.3 98 km NNW of San Antonio, Puerto Rico 00:20 UTC
12. 3.3 99 km NNW of San Antonio, Puerto Rico 01:47 UTC
13. 2.9 93 km N of San Antonio, Puerto Rico 23:03 UTC
14. 2.9 95 km NNW of San Antonio, Puerto Rico 16:25 UTC
15. 3.3 91 km NNW of San Antonio, Puerto Rico 16:10 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:33 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 4.0 on 2016-02-13 — it released about 28 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.