QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

Earthquake near Guánica, PR

No earthquake was likely felt in Guánica in the 24 hours to 12:55 pm AST (16:55 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 3.7 earthquake was recorded 16 km (10 mi) south-southeast of Guánica, PR, at 10:01 pm AST on 6 October 2025 (02:01 UTC), 11 km deep. 2 people have reported feeling it to USGS.

USGS: 15 km SSE of Guánica, Puerto Rico

30 km (19 mi) SW of Ponce, PR

10:01 pm AST, Oct 6, 2025 · · 11 km deep · released about 5.2 tons of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 14 kmGuayanilla Municipio 19 kmPeñuelas Municipio 25 kmLajas Municipio 25 kmYauco Municipio 27 kmSabana Grande Municipio 29 kmPonce Municipio 32 kmSan Germán Municipio 36 kmMaricao Municipio 38 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
10:01 pm AST on 6 October 2025 ()
Where
16 km (10 mi) south-southeast of Guánica, PR · earthquakes near Guánica
Magnitude
M 3.7 (md)
Depth
11 km below the surface
Felt
2 reports · strongest reported intensity II
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Guánica Municipio, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 327 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 74 km (46 mi) from the epicentre. In Guánica, 16 km away, the estimate is intensity III (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 21 km, intensity III · Yauco 22 km, intensity III · Magas Arriba 22 km, intensity III · Tallaboa 23 km, intensity III · Tallaboa Alta 29 km, intensity III · Ponce 31 km, intensity III · San Germán 34 km, intensity II · Pole Ojea 38 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 5.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 33,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 12,000 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 17.8390, -66.8556. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 14 km (9 mi) NNW earthquakes near Guánica Municipio
Guayanilla Municipio, PR 19 km (12 mi) NNE earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 25 km (15 mi) NNE earthquakes near Peñuelas Municipio
Lajas Municipio, PR 25 km (15 mi) NW earthquakes near Lajas Municipio
Yauco Municipio, PR 27 km (17 mi) N earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 29 km (18 mi) NNW 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. 3.3 10 km SSE of Maria Antonia, Puerto Rico
  2. 2.5 9 km SSE of Maria Antonia, Puerto Rico
  3. 2.6 7 km WNW of Adjuntas, Puerto Rico
  4. 1.7 6 km SW of Guánica, Puerto Rico
  5. 2.0 7 km SSE of Guánica, Puerto Rico
  6. 2.5 13 km SSE of Maria Antonia, Puerto Rico
  7. 2.5 14 km SSE of Maria Antonia, Puerto Rico
  8. 2.4 13 km SSE of Maria Antonia, Puerto Rico
  9. 2.9 12 km SSE of Maria Antonia, Puerto Rico
  10. 2.5 12 km SSE of Maria Antonia, Puerto Rico
  11. 2.8 12 km SSE of Maria Antonia, Puerto Rico
  12. 1.8 1 km NNW of Magas Arriba, Puerto Rico
  13. 2.3 2 km WSW of Indios, Puerto Rico
  14. 2.5 15 km SSE of Maria Antonia, Puerto Rico
  15. 2.4 14 km SSE 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.