QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Cayey, PR

No earthquake was likely felt in Cayey in the 24 hours to 4:27 pm AST (20:27 UTC). The last one was M 3.3, 38 km (24 mi) SW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Cayey

This page: a magnitude 1.6 earthquake was recorded 3 km (2 mi) southeast of Cayey, PR, at 10:33 pm AST on 23 March 2019 (02:33 UTC), 8.0 km deep.

USGS: 3 km SE of Cayey, Puerto Rico

36 km (22 mi) SSW of San Juan, PR · 19 km (12 mi) SW of Caguas, PR

10:33 pm AST, Mar 23, 2019 · · 8.0 km deep · released about 7.8 lb of TNT

Every earthquake near Cayey Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cayey Municipio 2 kmCidra Municipio 10 kmGuayama Municipio 13 kmAibonito Municipio 13 kmCaguas Municipio 17 kmArroyo Municipio 17 kmComerío Municipio 17 kmSalinas Municipio 18 kmAguas Buenas Municipio 19 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
10:33 pm AST on 23 March 2019 ()
Where
3 km (2 mi) southeast of Cayey, PR · earthquakes near Cayey
Magnitude
M 1.6 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Cayey Municipio, 2 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2790 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 8 km (5 mi) from the epicentre. In Cayey, 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: Cayey 3 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 31,000 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 · 19 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 18.0891, -66.1446. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cayey Municipio, PR 2 km (1 mi) NNW earthquakes near Cayey Municipio
Cidra Municipio, PR 10 km (6 mi) N earthquakes near Cidra Municipio
Guayama Municipio, PR 13 km (8 mi) S earthquakes near Guayama Municipio
Aibonito Municipio, PR 13 km (8 mi) WNW earthquakes near Aibonito Municipio
Caguas Municipio, PR 17 km (10 mi) NE earthquakes near Caguas Municipio
Arroyo Municipio, PR 17 km (11 mi) SE earthquakes near Arroyo 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. 4.1 5 km SSE of El Negro, Puerto Rico
  2. 2.1 1 km NNE of El Negro, Puerto Rico
  3. 2.1 5 km S of Palo Seco, Puerto Rico
  4. 1.9 6 km SE of Lamboglia, Puerto Rico
  5. 2.3 8 km SE of Lamboglia, Puerto Rico
  6. 1.9 9 km SE of Lamboglia, Puerto Rico
  7. 2.1 1 km WSW of Los Llanos, Puerto Rico
  8. 2.5 2 km ENE of Pájaros, Puerto Rico
  9. 1.5 5 km NW of Coamo, Puerto Rico
  10. 1.8 0 km SSE of Jobos, Puerto Rico
  11. 1.9 2 km S of Barahona, Puerto Rico
  12. 2.1 5 km NNE of Dorado, Puerto Rico
  13. 1.9 1 km E of Jauca, Puerto Rico
  14. 1.6 5 km SSE of Arroyo, Puerto Rico
  15. 2.5 1 km ESE of Toa Baja, 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.