QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7Md

Earthquake near Adjuntas, PR

No earthquake was likely felt in Adjuntas in the 24 hours to 12:07 pm AST (16:07 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 2.7 earthquake was recorded 6 km (4 mi) east of Adjuntas, PR, at 11:56 pm AST on 27 February 2017 (03:56 UTC), 17 km deep.

USGS: 5 km E of Adjuntas, Puerto Rico

18 km (11 mi) NNW of Ponce, PR

11:56 pm AST, Feb 27, 2017 · · 17 km deep · released about 340 lb of TNT

Every earthquake near Adjuntas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 10 kmJayuya Municipio 10 kmUtuado Municipio 13 kmPeñuelas Municipio 16 kmPonce Municipio 18 kmVillalba Municipio 21 kmYauco Municipio 22 kmGuayanilla Municipio 22 kmCiales 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
11:56 pm AST on 27 February 2017 ()
Where
6 km (4 mi) east of Adjuntas, PR · earthquakes near Adjuntas
Magnitude
M 2.7 (Md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 10 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3543 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, people at rest would likely notice it out to about 19 km (12 mi) from the epicentre. In Adjuntas, 6 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: Adjuntas 6 km, intensity II · Jayuya 11 km, intensity II · Tallaboa Alta 12 km, intensity II · Ponce 17 km, intensity II · Tallaboa 19 km, intensity II · Magas Arriba 19 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 340 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 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 · 46 km NNE 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 18.1569, -66.6680. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Adjuntas Municipio, PR 10 km (6 mi) WNW earthquakes near Adjuntas Municipio
Jayuya Municipio, PR 10 km (7 mi) NE earthquakes near Jayuya Municipio
Utuado Municipio, PR 13 km (8 mi) NNW earthquakes near Utuado Municipio
Peñuelas Municipio, PR 16 km (10 mi) SSW earthquakes near Peñuelas Municipio
Ponce Municipio, PR 18 km (11 mi) SSE earthquakes near Ponce Municipio
Villalba Municipio, PR 21 km (13 mi) E earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 2.0 9 km SW of Guánica, Puerto Rico
  2. 2.1 10 km SW of Guánica, Puerto Rico
  3. 2.0 5 km W of La Parguera, Puerto Rico
  4. 2.3 8 km ESE of Jayuya, Puerto Rico
  5. 1.9 1 km S of Liborio Negron Torres, Puerto Rico
  6. 2.2 2 km NNW of Lluveras, Puerto Rico
  7. 1.9 Puerto Rico region
  8. 1.8 2 km WSW of Villalba, Puerto Rico
  9. 2.4 5 km S of Adjuntas, Puerto Rico
  10. 1.9 8 km NNE of Lluveras, Puerto Rico
  11. 2.7 1 km NW of Monte Grande, Puerto Rico
  12. 2.1 1 km W of Palmarejo, Puerto Rico
  13. 1.7 6 km NNE of San Germán, Puerto Rico
  14. 2.6 12 km N of Garrochales, Puerto Rico
  15. 1.9 5 km ENE 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.