QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

Earthquake near Lluveras, PR

No earthquake was likely felt in Lluveras in the 24 hours to 10:21 am AST (14:21 UTC). The last one was M 2.1, 12 km (7 mi) E, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Lluveras

This page: a magnitude 3.2 earthquake was recorded in Lluveras, PR, at 3:36 pm AST on 28 July 2021 (19:36 UTC), 15 km deep.

USGS: 1 km ENE of Lluveras, Puerto Rico

28 km (18 mi) W of Ponce, PR

3:36 pm AST, Jul 28, 2021 · · 15 km deep · released about 1,800 lb of TNT

Every earthquake near Lluveras Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yauco Municipio 6 kmSabana Grande Municipio 8 kmGuayanilla Municipio 10 kmGuánica Municipio 11 kmMaricao Municipio 15 kmPeñuelas Municipio 17 kmSan Germán Municipio 17 kmLajas Municipio 18 kmAdjuntas Municipio 21 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
3:36 pm AST on 28 July 2021 ()
Where
in Lluveras, PR · earthquakes near Lluveras
Magnitude
M 3.2 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Yauco Municipio, 6 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1865 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 43 km (27 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: Yauco 4 km, intensity III · Guayanilla 10 km, intensity III · Magas Arriba 13 km, intensity III · San Germán 17 km, intensity II · Tallaboa 19 km, intensity II · Tallaboa Alta 20 km, intensity II · Adjuntas 22 km, intensity II · Lares 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 1,800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 8,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,800× the energy of this one
  4. This earthquake M 3.2 about 1,800 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.9× more

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 65,000 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 · 44 km NNW 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 18.0423, -66.8876. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Yauco Municipio, PR 6 km (4 mi) NNE earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 8 km (5 mi) NW earthquakes near Sabana Grande Municipio
Guayanilla Municipio, PR 10 km (6 mi) ESE earthquakes near Guayanilla Municipio
Guánica Municipio, PR 11 km (7 mi) SSW earthquakes near Guánica Municipio
Maricao Municipio, PR 15 km (10 mi) NNW earthquakes near Maricao Municipio
Peñuelas Municipio, PR 17 km (11 mi) E earthquakes near Peñuelas 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. 3.0 9 km SSE of Maria Antonia, Puerto Rico
  2. 2.7 0 km N of Guánica, Puerto Rico
  3. 3.0 4 km SSE of La Parguera, Puerto Rico
  4. 2.9 3 km W of Fuig, Puerto Rico
  5. 3.1 15 km NW of Puerto Real, Puerto Rico
  6. 2.3 14 km S of Guánica, Puerto Rico
  7. 2.4 4 km WSW of Fuig, Puerto Rico
  8. 2.6 Puerto Rico region
  9. 2.9 12 km SSE of Maria Antonia, Puerto Rico
  10. 2.4 6 km SSE of Maria Antonia, Puerto Rico
  11. 2.8 5 km SW of La Parguera, Puerto Rico
  12. 3.1 4 km SW of La Parguera, Puerto Rico
  13. 2.7 5 km WSW of La Parguera, Puerto Rico
  14. 3.2 4 km WSW of La Parguera, Puerto Rico
  15. 2.3 5 km WSW 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.