QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Mariano Colón, PR

No earthquake was likely felt in Mariano Colón in the 24 hours to 9:51 pm AST (01:51 UTC). The last one was M 2.2, in Mariano Colón, at 5:05 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Mariano Colón

This page: a magnitude 2.5 earthquake was recorded 2 km (1 mi) east-southeast of Mariano Colón, PR, at 11:32 pm AST on 11 December 2017 (03:32 UTC), 2.0 km deep.

USGS: 2 km ESE of Mariano Colón, Puerto Rico

51 km (31 mi) SSW of San Juan, PR · 33 km (20 mi) E of Ponce, PR

11:32 pm AST, Dec 11, 2017 · · 2.0 km deep · released about 150 lb of TNT

Every earthquake near Mariano Colón Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 7 kmSanta Isabel Municipio 10 kmCoamo Municipio 11 kmAibonito Municipio 14 kmJuana Díaz Municipio 19 kmGuayama Municipio 19 kmCayey Municipio 20 kmBarranquitas Municipio 20 kmVillalba Municipio 21 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
11:32 pm AST on 11 December 2017 ()
Where
2 km (1 mi) east-southeast of Mariano Colón, PR · earthquakes near Mariano Colón
Magnitude
M 2.5 (md)
Depth
2.0 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 7 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3257 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 22 km (14 mi) from the epicentre. In Mariano Colón, 2 km away, the estimate is intensity III (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: Coamo 8 km, intensity III · Santa Isabel 11 km, intensity II · Río Cañas Abajo 16 km, intensity II · Cayey 19 km, intensity II · Guayama 21 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 150 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 99,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 70,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.2× the energy of this one
  4. This earthquake M 2.5 about 150 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 4.6 on 2016-12-05 — about 1,600 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 33 km NE 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 18.0161, -66.3140. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 7 km (5 mi) SE earthquakes near Salinas Municipio
Santa Isabel Municipio, PR 10 km (7 mi) SW earthquakes near Santa Isabel Municipio
Coamo Municipio, PR 11 km (7 mi) NNW earthquakes near Coamo Municipio
Aibonito Municipio, PR 14 km (9 mi) NNE earthquakes near Aibonito Municipio
Juana Díaz Municipio, PR 19 km (12 mi) W earthquakes near Juana Díaz Municipio
Guayama Municipio, PR 19 km (12 mi) ESE earthquakes near Guayama Municipio

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

Aftershocks so far

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

  1. 2.2 7 km SSW of Tallaboa, Puerto Rico
  2. 1.9 11 km S of Tallaboa, Puerto Rico
  3. 1.7 10 km SSW of Tallaboa, Puerto Rico
  4. 2.0 9 km NNE of Tallaboa, Puerto Rico
  5. 2.2 9 km SSW of Tallaboa, Puerto Rico
  6. 1.5 10 km S of Jobos, Puerto Rico
  7. 1.6 8 km S of Tallaboa, Puerto Rico
  8. 1.8 8 km SSW of Tallaboa, Puerto Rico
  9. 2.0 7 km SSW of Tallaboa, Puerto Rico
  10. 2.3 8 km SSW of Tallaboa, Puerto Rico
  11. 2.5 9 km SSW of Tallaboa, Puerto Rico
  12. 1.9 11 km SSW of Tallaboa, Puerto Rico
  13. 2.3 9 km SSW of Tallaboa, Puerto Rico
  14. 2.1 9 km SSW of Tallaboa, Puerto Rico
  15. 2.1 8 km SSW of Tallaboa, 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.