QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Corozal, PR

No earthquake was likely felt in Corozal in the 24 hours to 6:55 pm AST (22:55 UTC). The last one was M 4.8, 80 km (50 mi) SW, at 9:19 am AST on 18 September 2026, estimated intensity III (weak) in town; 86 felt reports to USGS. Every earthquake near Corozal

This page: a magnitude 2.7 earthquake was recorded 7 km (4 mi) south-southwest of Corozal, PR, at 5:22 am AST on 19 August 2017 (09:22 UTC), 35 km deep.

USGS: 6 km SSW of Corozal, Puerto Rico

32 km (20 mi) WSW of San Juan, PR · 22 km (13 mi) WSW of Bayamón, PR

5:22 am AST, Aug 19, 2017 · · 35 km deep · released about 340 lb of TNT

Every earthquake near Corozal Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Corozal Municipio 3 kmMorovis Municipio 9 kmNaranjito Municipio 10 kmBarranquitas Municipio 11 kmOrocovis Municipio 12 kmToa Alta Municipio 13 kmComerío Municipio 15 kmVega Alta Municipio 16 kmCiales Municipio 18 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
5:22 am AST on 19 August 2017 ()
Where
7 km (4 mi) south-southwest of Corozal, PR · earthquakes near Corozal
Magnitude
M 2.7 (md)
Depth
35 km below the surface
Felt
no reports yet
Nearest
Corozal Municipio, 3 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3285 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Corozal, 7 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: Morovis, H. Rivera Colon, Franquez, Naranjito, Miranda, Barranquitas.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 · 38 km NW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 22 km E of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 24 km N 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 18.2888, -66.3445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Corozal Municipio, PR 3 km (2 mi) NE earthquakes near Corozal Municipio
Morovis Municipio, PR 9 km (5 mi) WNW earthquakes near Morovis Municipio
Naranjito Municipio, PR 10 km (6 mi) E earthquakes near Naranjito Municipio
Barranquitas Municipio, PR 11 km (7 mi) SSE earthquakes near Barranquitas Municipio
Orocovis Municipio, PR 12 km (8 mi) SW earthquakes near Orocovis Municipio
Toa Alta Municipio, PR 13 km (8 mi) NE earthquakes near Toa Alta Municipio

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

Aftershocks so far

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

  1. 2.3 2 km NNW of Potala Pastillo, Puerto Rico
  2. 3.0 4 km SSE of Cayey, Puerto Rico
  3. 1.9 3 km NNW of Potala Pastillo, Puerto Rico
  4. 1.6 1 km E of Capitanejo, Puerto Rico
  5. 2.7 11 km S of Jauca, Puerto Rico
  6. 2.4 1 km SSW of Potala Pastillo, Puerto Rico
  7. 2.2 6 km SSE of Jauca, Puerto Rico
  8. 2.9 7 km S of Jauca, Puerto Rico
  9. 3.1 12 km S of Santa Isabel, Puerto Rico
  10. 3.1 Puerto Rico region
  11. 3.3 12 km NNE of Tierras Nuevas Poniente, Puerto Rico
  12. 2.5 5 km E of Bayamon, Puerto Rico
  13. 3.1 1 km SW of Trujillo Alto, Puerto Rico
  14. 2.4 3 km SW of Santa Isabel, Puerto Rico
  15. 2.5 2 km ESE of Mariano Colón, 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.