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 11:29 am AST (15:29 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 17 km (10 mi) east-southeast of Las Marias, PR, at 8:36 am AST on 1 August 2023 (12:36 UTC), 26 km deep.

USGS: 2 km SSW of Las Marías, Puerto Rico

15 km (9 mi) ENE of Mayagüez, PR · 101 km (63 mi) W of San Juan, PR

8:36 am AST, Aug 1, 2023 · · 26 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 Las Marías Municipio 3 kmMaricao Municipio 9 kmSan Sebastián Municipio 12 kmSan Germán Municipio 14 kmAñasco Municipio 15 kmLares Municipio 15 kmHormigueros Municipio 16 kmSabana Grande Municipio 17 kmMoca Municipio 18 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
8:36 am AST on 1 August 2023 ()
Where
17 km (10 mi) east-southeast of Las Marias, PR · earthquakes near Las Marias
Magnitude
M 2.6 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 3 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1198 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 it was probably too small to be felt, even directly above it. In Las Marias, 17 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, San Sebastián, Juncal, Espino, Mayagüez, Lares.

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 6.4 on 2020-01-07 — about 500,000 times the energy of this one.

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

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 32 km NW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 43 km NNW of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 49 km NNW of this epicentre
  4. 5.8 4 km E of Moca, Puerto Rico · 20 km NNW of this epicentre
  5. 5.2 19 km SW of Stella, Puerto Rico · 39 km W 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 18.2280, -67.0048. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Las Marías Municipio, PR 3 km (2 mi) E earthquakes near Las Marías Municipio
Maricao Municipio, PR 9 km (6 mi) SE earthquakes near Maricao Municipio
San Sebastián Municipio, PR 12 km (7 mi) NNE earthquakes near San Sebastián Municipio
San Germán Municipio, PR 14 km (9 mi) SSW earthquakes near San Germán Municipio
Añasco Municipio, PR 15 km (9 mi) WNW earthquakes near Añasco Municipio
Lares Municipio, PR 15 km (9 mi) ENE earthquakes near Lares Municipio

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

Aftershocks so far

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

  1. 2.3 6 km SE of Maria Antonia, Puerto Rico
  2. 3.4 6 km SW of Guánica, Puerto Rico
  3. 2.4 4 km SW of Indios, Puerto Rico
  4. 2.5 7 km SE of Maria Antonia, Puerto Rico
  5. 2.1 Puerto Rico region
  6. 2.4 8 km SW of La Parguera, Puerto Rico
  7. 2.6 7 km SW of La Parguera, Puerto Rico
  8. 2.4 Puerto Rico region
  9. 2.2 13 km SSE of Gu?nica, Puerto Rico
  10. 3.0 7 km SSW of Indios, Puerto Rico
  11. 2.5 5 km NNW of Sabana Grande, Puerto Rico
  12. 2.1 Puerto Rico region
  13. 2.5 2 km WSW of La Parguera, Puerto Rico
  14. 2.7 16 km NW of Aguadilla, Puerto Rico
  15. 2.5 3 km N of Guayanilla, 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.