QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Juncal, PR

No earthquake was likely felt in Juncal in the 24 hours to 5:46 pm AST (21:46 UTC). The last one was M 3.1, 41 km (26 mi) S, at 3:58 pm AST on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Juncal

This page: a magnitude 1.8 earthquake was recorded 5 km (3 mi) southwest of Juncal, PR, at 10:19 am AST on 27 May 2019 (14:19 UTC), 22 km deep.

USGS: 4 km SW of Juncal, Puerto Rico

94 km (59 mi) W of San Juan, PR · 22 km (14 mi) ENE of Mayagüez, PR

10:19 am AST, May 27, 2019 · · 22 km deep · released about 15 lb of TNT

Every earthquake near Juncal Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Sebastián Municipio 6 kmLas Marías Municipio 7 kmLares Municipio 8 kmMaricao Municipio 12 kmMoca Municipio 18 kmAñasco Municipio 19 kmCamuy Municipio 20 kmQuebradillas Municipio 21 kmSan Germán 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
10:19 am AST on 27 May 2019 ()
Where
5 km (3 mi) southwest of Juncal, PR · earthquakes near Juncal
Magnitude
M 1.8 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
San Sebastián Municipio, 6 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2725 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. In Juncal, 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.

Earthquakes near other towns within 30 km: Lares, San Sebastián, Maricao, Quebrada, Cacao, Piedra Gorda.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 33 km WNW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 42 km NW of this epicentre
  3. 6.1 18 km NNW of San Antonio, Puerto Rico · 47 km NNW of this epicentre
  4. 5.8 4 km E of Moca, Puerto Rico · 19 km NW of this epicentre
  5. 5.2 19 km SW of Stella, Puerto Rico · 46 km WSW 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 18.2811, -66.9468. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Sebastián Municipio, PR 6 km (4 mi) NNW earthquakes near San Sebastián Municipio
Las Marías Municipio, PR 7 km (4 mi) SSW earthquakes near Las Marías Municipio
Lares Municipio, PR 8 km (5 mi) E earthquakes near Lares Municipio
Maricao Municipio, PR 12 km (7 mi) S earthquakes near Maricao Municipio
Moca Municipio, PR 18 km (11 mi) NW earthquakes near Moca Municipio
Añasco Municipio, PR 19 km (12 mi) W earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 2.0 17 km N of Arecibo, Puerto Rico
  2. 1.6 11 km NNE of Hatillo, Puerto Rico
  3. 1.8 18 km SW of Stella, Puerto Rico
  4. 1.6 3 km W of Tallaboa, Puerto Rico
  5. 1.5 6 km NNE of Lluveras, Puerto Rico
  6. 1.8 14 km WSW of Puerto Real, Puerto Rico
  7. 2.4 3 km SSW of La Playa, Puerto Rico
  8. 1.8 6 km W of Fuig, Puerto Rico
  9. 2.0 2 km WSW of Tallaboa, Puerto Rico
  10. 2.0 16 km NW of Puerto Real, Puerto Rico
  11. 1.5 5 km NE of Sabana Grande, Puerto Rico
  12. 2.4 3 km WNW of La Parguera, Puerto Rico
  13. 2.0 16 km WNW of Puerto Real, Puerto Rico
  14. 1.9 5 km N of Peñuelas, Puerto Rico
  15. 2.1 8 km S of Indios, 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.