QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Guayanilla, PR

No earthquake was likely felt in Guayanilla in the 24 hours to 7:45 am AST (11:45 UTC). The last one was M 2.1, in Guayanilla, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Guayanilla

This page: a magnitude 2.7 earthquake was recorded 2 km (1 mi) south-southwest of Guayanilla, PR, at 6:53 am AST on 3 August 2023 (10:53 UTC), 16 km deep.

USGS: Puerto Rico region

19 km (12 mi) W of Ponce, PR

6:53 am AST, Aug 3, 2023 · · 16 km deep · released about 380 lb of TNT

Every earthquake near Guayanilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayanilla Municipio 1 kmPeñuelas Municipio 8 kmYauco Municipio 11 kmGuánica Municipio 14 kmSabana Grande Municipio 18 kmPonce Municipio 21 kmAdjuntas Municipio 21 kmMaricao Municipio 24 kmLajas Municipio 25 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
6:53 am AST on 3 August 2023 ()
Where
2 km (1 mi) south-southwest of Guayanilla, PR · earthquakes near Guayanilla
Magnitude
M 2.7 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Guayanilla Municipio, 1 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1196 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 20 km (12 mi) from the epicentre. In Guayanilla, 2 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: Guayanilla 2 km, intensity II · Magas Arriba 4 km, intensity II · Yauco 7 km, intensity II · Tallaboa 9 km, intensity II · Tallaboa Alta 12 km, intensity II · Ponce 19 km, intensity II · Adjuntas 20 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 380 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 40,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 29,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 380 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 in our catalogue was M 6.4 on 2020-01-07 — about 320,000 times the energy of this one.

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 17.9993, -66.8007. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayanilla Municipio, PR 1 km (0 mi) NNE earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 8 km (5 mi) ENE earthquakes near Peñuelas Municipio
Yauco Municipio, PR 11 km (7 mi) NNW earthquakes near Yauco Municipio
Guánica Municipio, PR 14 km (9 mi) WSW earthquakes near Guánica Municipio
Sabana Grande Municipio, PR 18 km (11 mi) WNW earthquakes near Sabana Grande Municipio
Ponce Municipio, PR 21 km (13 mi) E earthquakes near Ponce Municipio

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

Aftershocks so far

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

  1. 1.7 Puerto Rico region
  2. 2.3 4 km W of Fuig, Puerto Rico
  3. 2.6 5 km W of Boquerón, Puerto Rico
  4. 2.2 Puerto Rico region
  5. 2.3 7 km SW of Guánica, Puerto Rico
  6. 2.2 2 km WSW of Indios, Puerto Rico
  7. 2.0 4 km SSW of Indios, Puerto Rico
  8. 2.2 5 km SSE of Maria Antonia, Puerto Rico
  9. 2.5 Puerto Rico region
  10. 2.4 3 km WNW of Santo Domingo, Puerto Rico
  11. 2.2 5 km WSW of Fuig, Puerto Rico
  12. 2.5 8 km S of Guánica, Puerto Rico
  13. 2.2 8 km WSW of Adjuntas, Puerto Rico
  14. 2.5 5 km WSW of La Parguera, Puerto Rico
  15. 2.5 6 km WSW of Guánica, 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.