QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4Md

Earthquake near Puerto Real, PR

No earthquake was likely felt in Puerto Real in the 24 hours to 6:09 pm AST (22:09 UTC). The last one was M 2.1, 10 km (6 mi) SE, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Puerto Real

This page: a magnitude 2.4 earthquake was recorded 12 km (7 mi) northwest of Puerto Real, PR, at 3:46 am AST on 20 January 2017 (07:46 UTC), 20 km deep.

USGS: 11 km NW of Puerto Real, Puerto Rico

15 km (9 mi) WSW of Mayagüez, PR · 131 km (81 mi) WSW of San Juan, PR

3:46 am AST, Jan 20, 2017 · · 20 km deep · released about 120 lb of TNT

Every earthquake near Puerto Real Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 16 kmCabo Rojo Municipio 19 kmAñasco Municipio 21 kmRincón Municipio 21 kmSan Germán Municipio 25 kmAguada Municipio 27 kmLajas Municipio 31 kmLas Marías Municipio 32 kmMoca Municipio 33 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
3:46 am AST on 20 January 2017 ()
Where
12 km (7 mi) northwest of Puerto Real, PR · earthquakes near Puerto Real
Magnitude
M 2.4 (Md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 16 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3582 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 7 km (4 mi) from the epicentre. In Puerto Real, 12 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: Cabo Rojo, Mayagüez, Hormigueros, Boquerón, La Playa, Monte Grande.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 5 earthquakes of M5 or more within 50 km:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 33 km N of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 45 km N of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 35 km NE of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 11 km WNW of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 11 km WNW 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 18.1476, -67.2705. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 16 km (10 mi) E earthquakes near Hormigueros Municipio
Cabo Rojo Municipio, PR 19 km (12 mi) SSE earthquakes near Cabo Rojo Municipio
Añasco Municipio, PR 21 km (13 mi) NE earthquakes near Añasco Municipio
Rincón Municipio, PR 21 km (13 mi) N earthquakes near Rincón Municipio
San Germán Municipio, PR 25 km (16 mi) E earthquakes near San Germán Municipio
Aguada Municipio, PR 27 km (17 mi) NNE earthquakes near Aguada Municipio

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

Aftershocks so far

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

  1. 2.9 4 km W of Maricao, Puerto Rico
  2. 2.5 23 km W of Puerto Real, Puerto Rico
  3. 1.9 11 km W of Rincón, Puerto Rico
  4. 3.0 3 km ESE of Luyando, Puerto Rico
  5. 2.1 9 km WNW of Rincón, Puerto Rico
  6. 2.6 5 km NE of San Germán, Puerto Rico
  7. 2.0 12 km S of La Parguera, Puerto Rico
  8. 2.9 10 km W of Mayagüez, Puerto Rico
  9. 2.4 11 km WNW of Puerto Real, Puerto Rico
  10. 3.2 38 km WSW of Stella, Puerto Rico
  11. 2.7 30 km NW of Rincón, Puerto Rico
  12. 3.0 20 km WSW of Stella, Puerto Rico
  13. 2.2 15 km SSW of La Parguera, Puerto Rico
  14. 2.0 10 km ESE of Maricao, Puerto Rico
  15. 2.2 0 km NNW of Cabo Rojo, 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.