139 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
4. This earthquake M 3.1 about 1,300 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.4× 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 19.5729, -65.2901. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.0 104 km N of Culebra, Puerto Rico 04:42 UTC
2. 3.5 124 km N of Charlotte Amalie, U.S. Virgin Islands 23:03 UTC
3. 2.7 110 km N of Charlotte Amalie, U.S. Virgin Islands 15:58 UTC
4. 1.6 91 km NNE of Luquillo, Puerto Rico 00:37 UTC
5. 3.9 118 km NNE of Vieques, Puerto Rico 05:20 UTC
6. 3.4 129 km NNE of Suárez, Puerto Rico 20:06 UTC
7. 2.9 105 km NNE of Vieques, Puerto Rico 19:43 UTC
8. 2.7 94 km NNW of Charlotte Amalie, U.S. Virgin Islands 15:21 UTC
9. 3.6 121 km N of Charlotte Amalie, U.S. Virgin Islands 07:04 UTC
10. 2.4 126 km NNE of Vieques, Puerto Rico 20:17 UTC
11. 3.1 145 km NNW of Charlotte Amalie, U.S. Virgin Islands 01:19 UTC
12. 3.1 102 km N of Charlotte Amalie, U.S. Virgin Islands 06:36 UTC
13. 3.2 120 km NNW of Charlotte Amalie, U.S. Virgin Islands 03:04 UTC
14. 2.7 130 km NNE of Vieques, Puerto Rico 05:08 UTC
15. 3.3 139 km NNW of Charlotte Amalie, U.S. Virgin Islands 02:01 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 19:02 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.