121 km NNW of San Antonio, Puerto Rico

2018-03-27 06:26 UTC · 40 km deep · released about 250 lb of TNT

Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 2018-03-27 06:26 UTC
Magnitude: M 2.6 (md)
Depth: 40 km below the surface
Felt: no reports yet
Nearest: Aguadilla Municipio, 121 km SSE
Status: Reviewed by a seismologist

USGS · last changed by USGS 3019 days ago · we first saw it 3019 days ago

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 250 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 61,000× the energy of this one
Magna, Utah 2020 M 5.7 43,000× the energy of this one
Around the size people start to feel M 3.0 3.8× the energy of this one
This earthquake M 2.6 about 250 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

Map loads when it scrolls into view

Epicentre 19.4646, -67.6421. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Aguadilla Municipio, PR	121 km (75 mi)	NNW of here	earthquakes near Aguadilla Municipio
Isabela Municipio, PR	127 km (79 mi)	NNW of here	earthquakes near Isabela Municipio
Quebradillas Municipio, PR	134 km (83 mi)	NW of here	earthquakes near Quebradillas Municipio
Camuy Municipio, PR	140 km (87 mi)	NW of here	earthquakes near Camuy Municipio
Hatillo Municipio, PR	144 km (90 mi)	NW of here	earthquakes near Hatillo Municipio
Arecibo Municipio, PR	153 km (95 mi)	NW of here	earthquakes near Arecibo Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

3.1 107 km NE of Punta Cana, Dominican Republic 08:25 UTC
3.4 137 km NNE of Punta Cana, Dominican Republic 04:27 UTC
3.0 100 km NE of Punta Cana, Dominican Republic 09:17 UTC
2.5 94 km NW of San Antonio, Puerto Rico 03:32 UTC
3.2 125 km NNW of San Antonio, Puerto Rico 00:45 UTC
3.1 117 km NE of Punta Cana, Dominican Republic 23:58 UTC
3.1 96 km NNW of San Antonio, Puerto Rico 07:31 UTC
2.8 91 km NE of Punta Cana, Dominican Republic 15:53 UTC
3.0 121 km NNW of San Antonio, Puerto Rico 01:25 UTC
2.9 114 km NNE of Punta Cana, Dominican Republic 02:56 UTC
3.0 117 km NNW of San Antonio, Puerto Rico 16:16 UTC
3.2 124 km NNE of Punta Cana, Dominican Republic 10:12 UTC
3.1 Mona Passage 22:08 UTC
2.9 97 km NW of San Antonio, Puerto Rico 04:33 UTC
3.3 124 km NNE of Punta Cana, Dominican Republic 18:17 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:03 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 4.2 on 2017-08-27 — it released about 230 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.