134 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 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 19.6366, -67.5285. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.2 98 km N of San Antonio, Puerto Rico 05:39 UTC
2. 3.7 113 km NNE of Punta Cana, Dominican Republic 20:16 UTC
3. 3.7 110 km N of Isabela, Puerto Rico 22:51 UTC
4. 3.4 109 km N of San Antonio, Puerto Rico 01:14 UTC
5. 3.4 110 km N of San Antonio, Puerto Rico 12:17 UTC
6. 3.8 138 km NNW of San Antonio, Puerto Rico 07:04 UTC
7. 3.4 112 km N of San Antonio, Puerto Rico 11:17 UTC
8. 3.6 91 km N of San Antonio, Puerto Rico 09:42 UTC
9. 3.8 92 km NNW of San Antonio, Puerto Rico 19:39 UTC
10. 3.7 94 km N of San Antonio, Puerto Rico 07:15 UTC
11. 3.8 117 km NNW of San Antonio, Puerto Rico 01:43 UTC
12. 3.2 101 km NW of San Antonio, Puerto Rico 18:44 UTC
13. 3.4 159 km NNW of San Antonio, Puerto Rico 18:28 UTC
14. 3.3 90 km NNW of San Antonio, Puerto Rico 11:58 UTC
15. 3.7 117 km NE of Punta Cana, Dominican Republic 05:30 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:02 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 4.6 on 2018-12-25 — it released about 12 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.