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 12:50 pm AST (16:50 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 5 km (3 mi) south of Adjuntas, PR, at 10:22 pm AST on 6 December 2023 (02:22 UTC), 23 km deep.

USGS: 4 km S of Adjuntas, Puerto Rico

18 km (11 mi) NW of Ponce, PR

10:22 pm AST, Dec 6, 2023 · · 23 km deep · released about 290 lb of TNT

Every earthquake near Adjuntas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 7 kmPeñuelas Municipio 11 kmYauco Municipio 14 kmGuayanilla Municipio 15 kmUtuado Municipio 17 kmJayuya Municipio 18 kmPonce Municipio 19 kmMaricao Municipio 22 kmLares Municipio 23 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
10:22 pm AST on 6 December 2023 ()
Where
5 km (3 mi) south of Adjuntas, PR · earthquakes near Adjuntas
Magnitude
M 2.7 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1028 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 8 km (5 mi) from the epicentre. In Adjuntas, 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: Adjuntas 5 km, intensity II · Tallaboa Alta 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 290 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 51,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 36,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.2× the energy of this one
  4. This earthquake M 2.7 about 290 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 6.4 on 2020-01-07 — about 410,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.8 4 km E of Moca, Puerto Rico · 47 km NW 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 18.1227, -66.7300. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Adjuntas Municipio, PR 7 km (4 mi) NNW earthquakes near Adjuntas Municipio
Peñuelas Municipio, PR 11 km (7 mi) S earthquakes near Peñuelas Municipio
Yauco Municipio, PR 14 km (9 mi) WSW earthquakes near Yauco Municipio
Guayanilla Municipio, PR 15 km (9 mi) SSW earthquakes near Guayanilla Municipio
Utuado Municipio, PR 17 km (10 mi) N earthquakes near Utuado Municipio
Jayuya Municipio, PR 18 km (11 mi) ENE earthquakes near Jayuya 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. 2.4 7 km S of Indios, Puerto Rico
  2. 2.4 7 km SE of Tallaboa, Puerto Rico
  3. 2.4 2 km S of Salinas, Puerto Rico
  4. 2.3 3 km NE of Sabana Grande, Puerto Rico
  5. 2.1 12 km SSE of Maria Antonia, Puerto Rico
  6. 2.0 5 km NE of La Parguera, Puerto Rico
  7. 2.3 2 km ENE of Lluveras, Puerto Rico
  8. 2.3 8 km SW of Guánica, Puerto Rico
  9. 2.4 3 km WSW of Indios, Puerto Rico
  10. 2.3 8 km ESE of La Parguera, Puerto Rico
  11. 1.8 4 km NNW of Yauco, Puerto Rico
  12. 2.2 2 km SE of Yauco, Puerto Rico
  13. 2.4 7 km SW of Guánica, Puerto Rico
  14. 2.3 5 km WSW of Guánica, Puerto Rico
  15. 2.3 11 km SSE of Maria Antonia, 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.