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 12:51 pm AST (16:51 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 3 km (2 mi) north of Corozal, PR, at 8:30 pm AST on 17 May 2018 (00:30 UTC), 54 km deep.

USGS: 3 km N of Corozal, Puerto Rico

26 km (16 mi) W of San Juan, PR · 16 km (10 mi) W of Bayamón, PR

8:30 pm AST, May 17, 2018 · · 54 km deep · released about 350 lb of TNT

Every earthquake near Corozal Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Toa Alta Municipio 7 kmCorozal Municipio 7 kmVega Alta Municipio 8 kmNaranjito Municipio 11 kmMorovis Municipio 13 kmDorado Municipio 13 kmVega Baja Municipio 13 kmBayamón Municipio 15 kmToa Baja Municipio 16 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
8:30 pm AST on 17 May 2018 ()
Where
3 km (2 mi) north of Corozal, PR · earthquakes near Corozal
Magnitude
M 2.7 (md)
Depth
54 km below the surface
Felt
no reports yet
Nearest
Toa Alta Municipio, 7 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3100 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, 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.

Earthquakes near other towns within 30 km: H. Rivera Colon, Vega Alta, Río Lajas, Galateo, San José, Toa Alta.

How big was it?

This earthquake released about 350 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 43,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 31,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.7× the energy of this one
  4. This earthquake M 2.7 about 350 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 · 34 km NW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 22 km ESE of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 15 km NNW 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 18.3686, -66.3118. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Toa Alta Municipio, PR 7 km (4 mi) E earthquakes near Toa Alta Municipio
Corozal Municipio, PR 7 km (5 mi) SSW earthquakes near Corozal Municipio
Vega Alta Municipio, PR 8 km (5 mi) NNW earthquakes near Vega Alta Municipio
Naranjito Municipio, PR 11 km (7 mi) SE earthquakes near Naranjito Municipio
Morovis Municipio, PR 13 km (8 mi) WSW earthquakes near Morovis Municipio
Dorado Municipio, PR 13 km (8 mi) NNE earthquakes near Dorado Municipio

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

Aftershocks so far

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

  1. 2.8 2 km N of Arecibo, Puerto Rico
  2. 1.7 1 km S of Adjuntas, Puerto Rico
  3. 2.5 4 km NNE of Guaynabo, Puerto Rico
  4. 1.5 0 km NNW of Buena Vista, Puerto Rico
  5. 1.9 5 km ENE of G. L. Garcia, Puerto Rico
  6. 1.9 0 km SE of Adjuntas, Puerto Rico
  7. 1.9 1 km NE of Adjuntas, Puerto Rico
  8. 2.3 8 km NNE of Jayuya, Puerto Rico
  9. 2.0 6 km NE of Comerío, Puerto Rico
  10. 2.3 2 km SSW of Bayamón, Puerto Rico
  11. 2.5 12 km NNE of Brenas, Puerto Rico
  12. 1.7 3 km ESE of G. L. Garcia, Puerto Rico
  13. 1.9 9 km NNW of Garrochales, Puerto Rico
  14. 2.8 2 km NW of Dorado, Puerto Rico
  15. 2.8 4 km N of Barceloneta, 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.