QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Las Marias, PR

No earthquake was likely felt in Las Marias in the 24 hours to 5:44 pm AST (21:44 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 3.0 earthquake was recorded 14 km (9 mi) east-southeast of Las Marias, PR, at 4:19 am AST on 7 July 2017 (08:19 UTC), 24 km deep. 5 people have reported feeling it to USGS.

USGS: 5 km SW of Las Marías, Puerto Rico

12 km (7 mi) ENE of Mayagüez, PR · 104 km (65 mi) W of San Juan, PR

4:19 am AST, Jul 7, 2017 · · 24 km deep · released about 950 lb of TNT

Every earthquake near Las Marias Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Marías Municipio 6 kmMaricao Municipio 12 kmAñasco Municipio 13 kmSan Germán Municipio 13 kmSan Sebastián Municipio 13 kmHormigueros Municipio 14 kmMoca Municipio 18 kmLares Municipio 18 kmSabana Grande 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
4:19 am AST on 7 July 2017 ()
Where
14 km (9 mi) east-southeast of Las Marias, PR · earthquakes near Las Marias
Magnitude
M 3.0 (md)
Depth
24 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Las Marías Municipio, 6 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3327 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 28 km (17 mi) from the epicentre. In Las Marias, 14 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: Mayagüez 12 km, intensity II · San Sebastián 13 km, intensity II · San Germán 16 km, intensity II · Lares 18 km, intensity II · Puerto Real 23 km, intensity II · Aguada 24 km, intensity II · Aguadilla 26 km, intensity II · Rincón 26 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 31 km NW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 42 km NNW of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 48 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 · 36 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 18.2260, -67.0315. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Las Marías Municipio, PR 6 km (4 mi) E earthquakes near Las Marías Municipio
Maricao Municipio, PR 12 km (7 mi) ESE earthquakes near Maricao Municipio
Añasco Municipio, PR 13 km (8 mi) WNW earthquakes near Añasco 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
Hormigueros Municipio, PR 14 km (8 mi) SW earthquakes near Hormigueros Municipio

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

Aftershocks so far

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

  1. 3.2 2 km S of La Playa, Puerto Rico
  2. 2.4 15 km S of Guánica, Puerto Rico
  3. 1.8 3 km SSE of Mayagüez, Puerto Rico
  4. 2.3 1 km SSE of Guayanilla, Puerto Rico
  5. 2.4 3 km NE of Mayagüez, Puerto Rico
  6. 1.8 6 km NNW of Sabana Grande, Puerto Rico
  7. 2.2 2 km NW of Tallaboa, Puerto Rico
  8. 2.7 6 km N of Santo Domingo, Puerto Rico
  9. 1.6 6 km SSW of Palmarejo, Puerto Rico
  10. 1.9 9 km ESE of Maricao, Puerto Rico
  11. 1.9 2 km SE of Lajas, Puerto Rico
  12. 2.0 3 km NW of Sabana Grande, Puerto Rico
  13. 1.7 7 km N of Yauco, Puerto Rico
  14. 1.6 6 km NNE of Lluveras, Puerto Rico
  15. 1.6 6 km SSW of Maricao, 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.