QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Cayuco, PR

No earthquake was likely felt in Cayuco in the 24 hours to 11:30 am AST (15:30 UTC). The last one was M 3.1, 41 km (26 mi) SSW, at 3:58 pm AST on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Cayuco

This page: a magnitude 2.1 earthquake was recorded in Cayuco, PR, at 2:40 pm AST on 24 July 2017 (18:40 UTC), 23 km deep.

USGS: 0 km SSW of Cayuco, Puerto Rico

73 km (45 mi) W of San Juan, PR · 19 km (12 mi) S of Arecibo, PR

2:40 pm AST, Jul 24, 2017 · · 23 km deep · released about 37 lb of TNT

Every earthquake near Cayuco Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Utuado Municipio 4 kmAdjuntas Municipio 12 kmLares Municipio 14 kmArecibo Municipio 18 kmJayuya Municipio 18 kmHatillo Municipio 18 kmFlorida Municipio 21 kmCamuy Municipio 22 kmCiales 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
2:40 pm AST on 24 July 2017 ()
Where
in Cayuco, PR · earthquakes near Cayuco
Magnitude
M 2.1 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Utuado Municipio, 4 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3397 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. 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: Utuado, Quebrada, Adjuntas, Rafael Capo, Lares, Rafael Gonzalez.

How big was it?

This earthquake released about 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 36 km NNE of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 37 km WNW of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 49 km ENE 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 18.2850, -66.7411. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Utuado Municipio, PR 4 km (3 mi) ESE earthquakes near Utuado Municipio
Adjuntas Municipio, PR 12 km (7 mi) S earthquakes near Adjuntas Municipio
Lares Municipio, PR 14 km (8 mi) W earthquakes near Lares Municipio
Arecibo Municipio, PR 18 km (11 mi) NNE earthquakes near Arecibo Municipio
Jayuya Municipio, PR 18 km (11 mi) ESE earthquakes near Jayuya Municipio
Hatillo Municipio, PR 18 km (11 mi) NNW earthquakes near Hatillo Municipio

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

Aftershocks so far

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

  1. 1.7 3 km SSE of Monte Grande, Puerto Rico
  2. 1.8 4 km SSE of Maricao, Puerto Rico
  3. 2.2 0 km N of Magas Arriba, Puerto Rico
  4. 1.8 5 km SW of Mayagüez, Puerto Rico
  5. 2.7 6 km SSW of Corozal, Puerto Rico
  6. 3.1 5 km NE of Orocovis, Puerto Rico
  7. 2.4 2 km W of Aibonito, Puerto Rico
  8. 2.6 0 km WSW of Sabana Eneas, Puerto Rico
  9. 2.1 4 km E of Espino, Puerto Rico
  10. 2.6 14 km N of Quebradillas, Puerto Rico
  11. 3.0 6 km NW of Palomas, Puerto Rico
  12. 2.9 2 km NNE of Franquez, Puerto Rico
  13. 2.1 6 km ESE of Maricao, Puerto Rico
  14. 2.9 5 km N of Carrizales, Puerto Rico
  15. 2.8 7 km N of Tierras Nuevas Poniente, 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.