Earthquake near Las Marias, PR

No earthquake was likely felt in Las Marias in the 24 hours to 8:40 pm AST (00:40 UTC). The last one was M 3.5, 12 km (8 mi) NNE, at 12:03 am AST on 6 November 2026, estimated intensity II (weak) in town. Every earthquake near Las Marias

This page: a magnitude 2.1 earthquake was recorded 16 km (10 mi) east-southeast of Las Marias, PR, at 1:32 am AST on 10 September 2017 (05:32 UTC), 26 km deep.

USGS: 4 km SW of Las Marías, Puerto Rico

14 km (8 mi) E of Mayagüez, PR · 102 km (64 mi) WSW of San Juan, PR

1:32 am AST, Sep 10, 2017 · 2017-09-10 05:32 UTC · 26 km deep · released about 49 lb of TNT

Every earthquake near Las Marias Felt it? Tell USGS Check my area

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: 1:32 am AST on 10 September 2017 (2017-09-10 05:32 UTC)
Where: 16 km (10 mi) east-southeast of Las Marias, PR · earthquakes near Las Marias
Magnitude: M 2.1 (md)
Depth: 26 km below the surface
Felt: no reports yet
Nearest: Las Marías Municipio, 4 km E
Status: Reviewed by a seismologist

USGS · last changed by USGS 3350 days ago · we first saw it 3350 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Las Marias, 16 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Maricao, Espino, San Sebastián, Mayagüez, Juncal, Añasco.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
Magna, Utah 2020 M 5.7 220,000× the energy of this one
Around the size people start to feel M 3.0 19× the energy of this one
This earthquake M 2.1 about 49 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

6.3 6 km WNW of Aguadilla, Puerto Rico · 32 km NW of this epicentre Oct 25, 1918
6.1 15 km WNW of San Antonio, Puerto Rico · 43 km NNW of this epicentre Oct 11, 1918
6.1 18 km NNW of San Antonio, Puerto Rico · 49 km NNW of this epicentre Nov 12, 1918
5.8 4 km E of Moca, Puerto Rico · 21 km NNW of this epicentre May 16, 2010
5.2 19 km SW of Stella, Puerto Rico · 38 km W of this epicentre Dec 17, 2011

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Map loads when it scrolls into view

Nearby places

Place	Distance	Direction from the epicentre
Las Marías Municipio, PR	4 km (3 mi)	E	earthquakes near Las Marías Municipio
Maricao Municipio, PR	10 km (6 mi)	ESE	earthquakes near Maricao Municipio
San Germán Municipio, PR	13 km (8 mi)	S	earthquakes near San Germán Municipio
San Sebastián Municipio, PR	13 km (8 mi)	NNE	earthquakes near San Sebastián Municipio
Añasco Municipio, PR	14 km (9 mi)	WNW	earthquakes near Añasco Municipio
Hormigueros Municipio, PR	14 km (9 mi)	SW	earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

2.1 4 km ESE of Las Marías, Puerto Rico 21:05 UTC
1.8 2 km SSW of Palmarejo, Puerto Rico 16:55 UTC
1.9 8 km SSE of Pole Ojea, Puerto Rico 15:26 UTC
2.1 9 km S of Pole Ojea, Puerto Rico 14:51 UTC
2.3 22 km W of Puerto Real, Puerto Rico 15:25 UTC
3.1 4 km NNE of Hatillo, Puerto Rico 09:28 UTC
2.7 6 km SE of Espino, Puerto Rico 10:19 UTC
2.0 1 km WNW of Lluveras, Puerto Rico 06:10 UTC
2.1 5 km WSW of Rincón, Puerto Rico 04:37 UTC
2.2 7 km WSW of La Playa, Puerto Rico 21:02 UTC
2.7 12 km NW of San Antonio, Puerto Rico 05:46 UTC
3.0 16 km WSW of Stella, Puerto Rico 22:22 UTC
2.9 2 km NNW of Boquerón, Puerto Rico 12:45 UTC
2.1 0 km NNW of Hormigueros, Puerto Rico 02:40 UTC
1.6 7 km W of La Parguera, Puerto Rico 21:31 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 00:40 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.