QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Cayuco, PR

No earthquake was likely felt in Cayuco in the 24 hours to 10:44 pm AST (02:44 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 1.9 earthquake was recorded 5 km (3 mi) west of Cayuco, PR, at 9:24 pm AST on 23 April 2019 (01:24 UTC), 9.0 km deep.

USGS: 4 km W of Cayuco, Puerto Rico

77 km (48 mi) W of San Juan, PR · 19 km (11 mi) SSW of Arecibo, PR

9:24 pm AST, Apr 23, 2019 · · 9.0 km deep · released about 21 lb of TNT

Every earthquake near Cayuco Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Utuado Municipio 9 kmLares Municipio 9 kmAdjuntas Municipio 13 kmHatillo Municipio 16 kmCamuy Municipio 19 kmArecibo Municipio 19 kmSan Sebastián Municipio 20 kmMaricao Municipio 21 kmLas Marías Municipio 22 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
9:24 pm AST on 23 April 2019 ()
Where
5 km (3 mi) west of Cayuco, PR · earthquakes near Cayuco
Magnitude
M 1.9 (md)
Depth
9.0 km below the surface
Felt
no reports yet
Nearest
Utuado Municipio, 9 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2759 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 12 km (7 mi) from the epicentre. In Cayuco, 5 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: Lares 10 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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. 6.3 6 km WNW of Aguadilla, Puerto Rico · 48 km WNW of this epicentre
  2. 5.8 12 km N of Garrochales, Puerto Rico · 38 km NE of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 33 km WNW 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 18.2945, -66.7820. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Utuado Municipio, PR 9 km (5 mi) ESE earthquakes near Utuado Municipio
Lares Municipio, PR 9 km (6 mi) WSW earthquakes near Lares Municipio
Adjuntas Municipio, PR 13 km (8 mi) SSE earthquakes near Adjuntas Municipio
Hatillo Municipio, PR 16 km (10 mi) N earthquakes near Hatillo Municipio
Camuy Municipio, PR 19 km (12 mi) NNW earthquakes near Camuy Municipio
Arecibo Municipio, PR 19 km (12 mi) NE earthquakes near Arecibo Municipio

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

Aftershocks so far

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

  1. 1.6 5 km ESE of Boquerón, Puerto Rico
  2. 1.8 10 km SSW of Guánica, Puerto Rico
  3. 2.5 5 km ESE of Piedra Gorda, Puerto Rico
  4. 1.8 4 km W of Capitanejo, Puerto Rico
  5. 2.1 1 km N of Aguilita, Puerto Rico
  6. 2.1 0 km E of Yauco, Puerto Rico
  7. 1.5 3 km W of Palmarejo, Puerto Rico
  8. 1.6 5 km S of Piedra Gorda, Puerto Rico
  9. 1.8 3 km N of Yauco, Puerto Rico
  10. 1.7 2 km E of Hormigueros, Puerto Rico
  11. 1.5 5 km SE of Adjuntas, Puerto Rico
  12. 2.4 8 km N of San Antonio, Puerto Rico
  13. 1.7 8 km W of Mayagüez, Puerto Rico
  14. 2.0 8 km NE of Tierras Nuevas Poniente, Puerto Rico
  15. 1.6 7 km NE of Sabana Grande, 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.