QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Coco, PR

No earthquake was likely felt in Coco in the 24 hours to 11:23 am AST (15:23 UTC). The last one was M 2.2, 10 km (6 mi) WNW, at 5:05 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Coco

This page: a magnitude 2.4 earthquake was recorded 3 km (2 mi) south of Coco, PR, at 7:57 pm AST on 10 August 2017 (23:57 UTC), 10 km deep.

USGS: 3 km S of Coco, Puerto Rico

52 km (32 mi) SSW of San Juan, PR · 37 km (23 mi) SW of Caguas, PR

7:57 pm AST, Aug 10, 2017 · · 10 km deep · released about 100 lb of TNT

Every earthquake near Coco Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Salinas Municipio 1 kmGuayama Municipio 13 kmSanta Isabel Municipio 14 kmAibonito Municipio 17 kmCoamo Municipio 17 kmCayey Municipio 18 kmArroyo Municipio 23 kmJuana Díaz Municipio 24 kmCidra Municipio 24 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
7:57 pm AST on 10 August 2017 ()
Where
3 km (2 mi) south of Coco, PR · earthquakes near Coco
Magnitude
M 2.4 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Salinas Municipio, 1 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3379 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 18 km (11 mi) from the epicentre. In Coco, 3 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: Santa Isabel 15 km, intensity II · Coamo 15 km, intensity II · Guayama 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 100 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 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 100,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.1× the energy of this one
  4. This earthquake M 2.4 about 100 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 2,300 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 · 34 km NNE 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 17.9766, -66.2615. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Salinas Municipio, PR 1 km (0 mi) S earthquakes near Salinas Municipio
Guayama Municipio, PR 13 km (8 mi) E earthquakes near Guayama Municipio
Santa Isabel Municipio, PR 14 km (8 mi) W earthquakes near Santa Isabel Municipio
Aibonito Municipio, PR 17 km (11 mi) N earthquakes near Aibonito Municipio
Coamo Municipio, PR 17 km (11 mi) NW earthquakes near Coamo Municipio
Cayey Municipio, PR 18 km (11 mi) NE earthquakes near Cayey Municipio

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

Aftershocks so far

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

  1. 2.4 5 km SW of Orocovis, Puerto Rico
  2. 2.2 19 km SSE of Tallaboa, Puerto Rico
  3. 2.3 2 km NNW of Potala Pastillo, Puerto Rico
  4. 2.7 2 km NW of Candelero Arriba, Puerto Rico
  5. 3.0 4 km SSE of Cayey, Puerto Rico
  6. 1.9 3 km NNW of Potala Pastillo, Puerto Rico
  7. 1.6 1 km E of Capitanejo, Puerto Rico
  8. 2.7 11 km S of Jauca, Puerto Rico
  9. 2.4 1 km SSW of Potala Pastillo, Puerto Rico
  10. 2.2 6 km SSE of Jauca, Puerto Rico
  11. 2.9 7 km S of Jauca, Puerto Rico
  12. 3.1 12 km S of Santa Isabel, Puerto Rico
  13. 3.1 Puerto Rico region
  14. 2.5 5 km E of Bayamon, Puerto Rico
  15. 3.1 1 km SW of Trujillo Alto, 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.