QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Guánica, PR

No earthquake was likely felt in Guánica in the 24 hours to 10:48 am AST (14:48 UTC). The last one was M 2.1, 13 km (8 mi) ENE, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Guánica

This page: a magnitude 2.5 earthquake was recorded 4 km (3 mi) south-southeast of Guánica, PR, at 1:23 pm AST on 25 July 2021 (17:23 UTC), 13 km deep.

USGS: 4 km SSE of Guánica, Puerto Rico

29 km (18 mi) WSW of Ponce, PR

1:23 pm AST, Jul 25, 2021 · · 13 km deep · released about 150 lb of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 4 kmGuayanilla Municipio 12 kmLajas Municipio 16 kmYauco Municipio 17 kmSabana Grande Municipio 17 kmPeñuelas Municipio 20 kmSan Germán Municipio 24 kmMaricao Municipio 27 kmAdjuntas Municipio 30 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
1:23 pm AST on 25 July 2021 ()
Where
4 km (3 mi) south-southeast of Guánica, PR · earthquakes near Guánica
Magnitude
M 2.5 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1935 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 18 km (11 mi) from the epicentre. In Guánica, 4 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: Yauco 12 km, intensity II · Guayanilla 14 km, intensity II · Magas Arriba 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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 810,000 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 17.9385, -66.8910. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 4 km (2 mi) WNW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 12 km (8 mi) NE earthquakes near Guayanilla Municipio
Lajas Municipio, PR 16 km (10 mi) WNW earthquakes near Lajas Municipio
Yauco Municipio, PR 17 km (10 mi) NNE earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 17 km (11 mi) NNW earthquakes near Sabana Grande Municipio
Peñuelas Municipio, PR 20 km (12 mi) ENE earthquakes near Peñuelas Municipio

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

Aftershocks so far

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

  1. 3.0 5 km WSW of La Parguera, Puerto Rico
  2. 3.1 6 km W of La Parguera, Puerto Rico
  3. 1.7 2 km W of Guayanilla, Puerto Rico
  4. 2.6 2 km ESE of Maria Antonia, Puerto Rico
  5. 2.8 5 km WSW of La Parguera, Puerto Rico
  6. 3.4 8 km WSW of La Parguera, Puerto Rico
  7. 3.4 7 km WSW of La Parguera, Puerto Rico
  8. 1.5 5 km SW of Palmarejo, Puerto Rico
  9. 2.1 6 km WSW of La Parguera, Puerto Rico
  10. 2.5 4 km WSW of La Parguera, Puerto Rico
  11. 2.6 6 km SSE of Maria Antonia, Puerto Rico
  12. 2.5 10 km SSE of Guánica, Puerto Rico
  13. 2.6 5 km WSW of Guánica, Puerto Rico
  14. 3.1 5 km WSW of Fuig, Puerto Rico
  15. 2.9 4 km ESE 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.