QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Las Marias, PR

No earthquake was likely felt in Las Marias in the 24 hours to 4:24 pm AST (20:24 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 2.6 earthquake was recorded 3 km (2 mi) northwest of Las Marias, PR, at 1:05 am AST on 31 March 2025 (05:05 UTC), 18 km deep.

USGS: 2 km NW of Las Marias, Puerto Rico

12 km (8 mi) NNW of Mayagüez, PR · 117 km (73 mi) W of San Juan, PR

1:05 am AST, Mar 31, 2025 · · 18 km deep · released about 240 lb of TNT

Every earthquake near Las Marias Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 5 kmAguada Municipio 8 kmRincón Municipio 9 kmMoca Municipio 12 kmAguadilla Municipio 19 kmHormigueros Municipio 20 kmSan Sebastián Municipio 21 kmLas Marías Municipio 22 kmIsabela Municipio 25 km
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
1:05 am AST on 31 March 2025 ()
Where
3 km (2 mi) northwest of Las Marias, PR · earthquakes near Las Marias
Magnitude
M 2.6 (md)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 5 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 591 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 16 km (10 mi) from the epicentre. In Las Marias, 3 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.

Likely felt in: Aguada 8 km, intensity II · Rincón 9 km, intensity II · Mayagüez 12 km, intensity II · Aguadilla 13 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 240 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.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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

The largest earthquake within 50 km since 2016 was M 5.3 on 2020-07-03 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 44 km N of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 41 km NNW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 16 km NNW of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 28 km NNW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 37 km N of this epicentre

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

Epicentre 18.3085, -67.1673. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 5 km (3 mi) ESE earthquakes near Añasco Municipio
Aguada Municipio, PR 8 km (5 mi) NNW earthquakes near Aguada Municipio
Rincón Municipio, PR 9 km (6 mi) WNW earthquakes near Rincón Municipio
Moca Municipio, PR 12 km (7 mi) NE earthquakes near Moca Municipio
Aguadilla Municipio, PR 19 km (12 mi) N earthquakes near Aguadilla Municipio
Hormigueros Municipio, PR 20 km (12 mi) SSE earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 3.0 27 km WSW of Stella, Puerto Rico
  2. 2.3 5 km SW of Palmarejo, Puerto Rico
  3. 1.8 5 km ESE of La Parguera, Puerto Rico
  4. 2.9 27 km SW of Stella, Puerto Rico
  5. 2.2 1 km W of Mayagüez, Puerto Rico
  6. 2.4 1 km WNW of Guánica, Puerto Rico
  7. 2.7 2 km SSW of Guánica, Puerto Rico
  8. 2.0 1 km W of Lluveras, Puerto Rico
  9. 2.1 2 km W of Fuig, Puerto Rico
  10. 3.3 21 km WNW of Rincón, Puerto Rico
  11. 2.3 1 km NNE of Maria Antonia, Puerto Rico
  12. 2.8 20 km W of Pole Ojea, Puerto Rico
  13. 3.0 24 km N of Isabela, Puerto Rico
  14. 2.0 4 km ESE of La Parguera, Puerto Rico
  15. 2.1 3 km N of La Parguera, Puerto Rico

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.