QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

Earthquake near Guánica, PR

Yes: an earthquake was likely felt in Guánica in the last 24 hours. M 2.1, 7 km (4 mi) ENE of Guánica, at 4:14 pm AST on 11 November 2026 (20:14 UTC); the estimated shaking in Guánica was intensity II (weak). Every earthquake near Guánica

This page: a magnitude 4.0 earthquake was recorded 6 km (4 mi) south of Guánica, PR, at 3:52 pm AST on 7 October 2023 (19:52 UTC), 8.0 km deep. 13 people have reported feeling it to USGS.

USGS: Puerto Rico region

32 km (20 mi) WSW of Ponce, PR

3:52 pm AST, Oct 7, 2023 · · 8.0 km deep · released about 16 tons of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 4 kmLajas Municipio 15 kmGuayanilla Municipio 16 kmSabana Grande Municipio 19 kmYauco Municipio 20 kmPeñuelas Municipio 23 kmSan Germán Municipio 25 kmMaricao Municipio 29 kmCabo Rojo 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
3:52 pm AST on 7 October 2023 ()
Where
6 km (4 mi) south of Guánica, PR · earthquakes near Guánica
Magnitude
M 4.0 (md)
Depth
8.0 km below the surface
Felt
13 reports · strongest reported intensity VI
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Guánica Municipio, 4 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1063 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 97 km (60 mi) from the epicentre. In Guánica, 6 km away, the estimate is intensity IV (light). 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 15 km, intensity III · Guayanilla 17 km, intensity III · Magas Arriba 19 km, intensity III · Tallaboa 22 km, intensity III · San Germán 23 km, intensity III · Tallaboa Alta 27 km, intensity III · Pole Ojea 30 km, intensity III · Ponce 32 km, intensity III. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 16 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 480× the energy of this one
  3. Magna, Utah 2020 M 5.7 340× the energy of this one
  4. This earthquake M 4.0 about 16 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 33× 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 in our catalogue was M 6.4 on 2020-01-07 — about 3,800 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 17.9158, -66.9118. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 4 km (2 mi) NNW earthquakes near Guánica Municipio
Lajas Municipio, PR 15 km (9 mi) WNW earthquakes near Lajas Municipio
Guayanilla Municipio, PR 16 km (10 mi) NE earthquakes near Guayanilla Municipio
Sabana Grande Municipio, PR 19 km (12 mi) NNW earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 20 km (12 mi) NNE earthquakes near Yauco Municipio
Peñuelas Municipio, PR 23 km (14 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. 1.9 11 km S of Guánica, Puerto Rico
  2. 2.3 6 km SW of Guánica, Puerto Rico
  3. 2.2 Puerto Rico region
  4. 2.5 6 km WSW of Guánica, Puerto Rico
  5. 2.7 4 km WSW of Fuig, Puerto Rico
  6. 2.6 7 km SE of Maria Antonia, Puerto Rico
  7. 2.0 4 km WSW of Fuig, Puerto Rico
  8. 1.7 5 km WSW of Guánica, Puerto Rico
  9. 2.6 6 km SW of Guánica, Puerto Rico
  10. 2.0 Puerto Rico region
  11. 2.0 1 km ENE of Guayanilla, Puerto Rico
  12. 3.0 6 km SW of Guánica, Puerto Rico
  13. 3.1 9 km SSE of Maria Antonia, Puerto Rico
  14. 2.6 6 km SW of Gu?nica, Puerto Rico
  15. 2.9 5 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.