QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Guayanilla, PR

No earthquake was likely felt in Guayanilla in the 24 hours to 11:27 am AST (15:27 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 3.0 earthquake was recorded in Guayanilla, PR, at 2:56 am AST on 28 April 2023 (06:56 UTC), 16 km deep. 1 person has reported feeling it to USGS.

USGS: 1 km NE of Guayanilla, Puerto Rico

17 km (11 mi) W of Ponce, PR

2:56 am AST, Apr 28, 2023 · · 16 km deep · released about 800 lb of TNT

Every earthquake near Guayanilla Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayanilla Municipio 3 kmPeñuelas Municipio 6 kmYauco Municipio 10 kmGuánica Municipio 17 kmAdjuntas Municipio 17 kmSabana Grande Municipio 19 kmPonce Municipio 19 kmMaricao Municipio 23 kmLajas Municipio 28 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
2:56 am AST on 28 April 2023 ()
Where
in Guayanilla, PR · earthquakes near Guayanilla
Magnitude
M 3.0 (md)
Depth
16 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guayanilla Municipio, 3 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1293 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 30 km (19 mi) from the epicentre. 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 in town, intensity III · Magas Arriba in town, intensity III · Yauco 7 km, intensity II · Tallaboa 8 km, intensity II · Tallaboa Alta 9 km, intensity II · Adjuntas 16 km, intensity II · Ponce 17 km, intensity II · San Germán 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 420,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 13,000× the energy of this one
  4. This earthquake M 3.0 about 800 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 150,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 18.0265, -66.7818. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayanilla Municipio, PR 3 km (2 mi) SW earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 6 km (4 mi) E earthquakes near Peñuelas Municipio
Yauco Municipio, PR 10 km (6 mi) NW earthquakes near Yauco Municipio
Guánica Municipio, PR 17 km (11 mi) WSW earthquakes near Guánica Municipio
Adjuntas Municipio, PR 17 km (11 mi) N earthquakes near Adjuntas Municipio
Sabana Grande Municipio, PR 19 km (12 mi) WNW earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.5 3 km NNW of Lluveras, Puerto Rico
  2. 2.2 8 km WSW of Guánica, Puerto Rico
  3. 2.7 7 km WSW of Guánica, Puerto Rico
  4. 1.9 1 km ESE of Sabana Grande, Puerto Rico
  5. 2.3 4 km S of Tallaboa, Puerto Rico
  6. 2.4 6 km SSW of Indios, Puerto Rico
  7. 1.5 Puerto Rico region
  8. 2.3 2 km N of Guayanilla, Puerto Rico
  9. 1.7 6 km WSW of Guánica, Puerto Rico
  10. 2.2 7 km SE of Maria Antonia, Puerto Rico
  11. 2.3 6 km SE of Maria Antonia, Puerto Rico
  12. 2.3 8 km SE of Maria Antonia, Puerto Rico
  13. 2.3 8 km SSE of Maria Antonia, Puerto Rico
  14. 2.2 1 km NNE of Guayanilla, Puerto Rico
  15. 1.8 1 km SE 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.