QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Adjuntas, PR

No earthquake was likely felt in Adjuntas in the 24 hours to 5:52 pm AST (21:52 UTC). The last one was M 3.0, 31 km (19 mi) SSW, at 3:45 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Adjuntas

This page: a magnitude 1.8 earthquake was recorded 8 km (5 mi) east-southeast of Adjuntas, PR, at 10:45 pm AST on 27 October 2019 (02:45 UTC), 13 km deep.

USGS: 8 km ESE of Adjuntas, Puerto Rico

14 km (9 mi) NNW of Ponce, PR

10:45 pm AST, Oct 27, 2019 · · 13 km deep · released about 17 lb of TNT

Every earthquake near Adjuntas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Jayuya Municipio 12 kmAdjuntas Municipio 13 kmPeñuelas Municipio 13 kmPonce Municipio 14 kmUtuado Municipio 17 kmVillalba Municipio 19 kmGuayanilla Municipio 20 kmYauco Municipio 22 kmJuana Díaz 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
10:45 pm AST on 27 October 2019 ()
Where
8 km (5 mi) east-southeast of Adjuntas, PR · earthquakes near Adjuntas
Magnitude
M 1.8 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Jayuya Municipio, 12 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2572 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 5 km (3 mi) from the epicentre. In Adjuntas, 8 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: Tallaboa Alta, Peñuelas, Santo Domingo, Jayuya, Ponce, Coto Laurel.

How big was it?

This earthquake released about 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 one earthquake of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 50 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 18.1230, -66.6535. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Jayuya Municipio, PR 12 km (7 mi) NE earthquakes near Jayuya Municipio
Adjuntas Municipio, PR 13 km (8 mi) WNW earthquakes near Adjuntas Municipio
Peñuelas Municipio, PR 13 km (8 mi) SW earthquakes near Peñuelas Municipio
Ponce Municipio, PR 14 km (9 mi) SSE earthquakes near Ponce Municipio
Utuado Municipio, PR 17 km (11 mi) NNW earthquakes near Utuado Municipio
Villalba Municipio, PR 19 km (12 mi) E earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 2.3 9 km SSW of Potala Pastillo, Puerto Rico
  2. 1.9 4 km ENE of Hormigueros, Puerto Rico
  3. 1.8 13 km S of Ponce, Puerto Rico
  4. 1.8 1 km S of Guayanilla, Puerto Rico
  5. 1.9 1 km ENE of Sabana Grande, Puerto Rico
  6. 2.1 0 km NNW of Mariano Colón, Puerto Rico
  7. 2.6 3 km SE of Jayuya, Puerto Rico
  8. 2.0 3 km SSE of Palmarejo, Puerto Rico
  9. 2.3 10 km SW of Central Aguirre, Puerto Rico
  10. 1.8 Puerto Rico region
  11. 1.6 3 km NNE of Ponce, Puerto Rico
  12. 2.3 2 km SSW of Las Ochenta, Puerto Rico
  13. 2.0 1 km WNW of Las Ochenta, Puerto Rico
  14. 2.1 4 km WNW of La Parguera, Puerto Rico
  15. 1.6 7 km S of La Parguera, 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.