QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Hormigueros, PR

No earthquake was likely felt in Hormigueros in the 24 hours to 4:30 pm AST (20:30 UTC). The last one was M 2.1, 15 km (9 mi) S, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Hormigueros

This page: a magnitude 2.5 earthquake was recorded 6 km (4 mi) west of Hormigueros, PR, at 6:24 pm AST on 21 June 2017 (22:24 UTC), 17 km deep.

USGS: 6 km W of Hormigueros, Puerto Rico

8 km (5 mi) SW of Mayagüez, PR · 122 km (76 mi) WSW of San Juan, PR

6:24 pm AST, Jun 21, 2017 · · 17 km deep · released about 160 lb of TNT

Every earthquake near Hormigueros Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 8 kmSan Germán Municipio 16 kmCabo Rojo Municipio 17 kmAñasco Municipio 17 kmRincón Municipio 22 kmLas Marías Municipio 24 kmLajas Municipio 24 kmAguada Municipio 25 kmSabana Grande Municipio 26 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
6:24 pm AST on 21 June 2017 ()
Where
6 km (4 mi) west of Hormigueros, PR · earthquakes near Hormigueros
Magnitude
M 2.5 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 8 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3429 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 14 km (9 mi) from the epicentre. In Hormigueros, 6 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 8 km, intensity II · Puerto Real 8 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 160 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 95,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 68,000× the energy of this one
  3. Around the size people start to feel M 3.0 6× the energy of this one
  4. This earthquake M 2.5 about 160 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 · 31 km NNE of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 20 km WNW of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 20 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 18.1465, -67.1871. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 8 km (5 mi) E earthquakes near Hormigueros Municipio
San Germán Municipio, PR 16 km (10 mi) ESE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 17 km (10 mi) S earthquakes near Cabo Rojo Municipio
Añasco Municipio, PR 17 km (10 mi) NNE earthquakes near Añasco Municipio
Rincón Municipio, PR 22 km (14 mi) NNW earthquakes near Rincón Municipio
Las Marías Municipio, PR 24 km (15 mi) ENE earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 2.2 3 km SSE of Boquerón, Puerto Rico
  2. 2.7 2 km ESE of Magas Arriba, Puerto Rico
  3. 2.3 4 km WSW of Tallaboa, Puerto Rico
  4. 2.1 0 km SSW of Cayuco, Puerto Rico
  5. 1.9 14 km SSW of Guánica, Puerto Rico
  6. 1.9 3 km SE of La Parguera, Puerto Rico
  7. 2.2 17 km S of Guánica, Puerto Rico
  8. 2.6 10 km NW of Puerto Real, Puerto Rico
  9. 2.3 2 km NE of Hormigueros, Puerto Rico
  10. 1.6 4 km ESE of La Parguera, Puerto Rico
  11. 1.7 1 km SW of Cabo Rojo, Puerto Rico
  12. 2.3 10 km S of Lares, Puerto Rico
  13. 2.7 27 km WNW of Rincón, Puerto Rico
  14. 1.8 5 km NNE of San Germán, Puerto Rico
  15. 2.5 10 km WSW of Adjuntas, 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.