QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

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 3.7 earthquake was recorded 15 km (9 mi) south-southwest of Guánica, PR, at 10:38 am AST on 29 April 2024 (14:38 UTC), 12 km deep. 1 person has reported feeling it to USGS.

USGS: 14 km SSW of Guánica, Puerto Rico

38 km (24 mi) WSW of Ponce, PR

10:38 am AST, Apr 29, 2024 · · 12 km deep · released about 5.4 tons of TNT

Every earthquake near Guánica Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 12 kmLajas Municipio 18 kmGuayanilla Municipio 24 kmSabana Grande Municipio 26 kmYauco Municipio 28 kmCabo Rojo Municipio 30 kmPeñuelas Municipio 31 kmSan Germán Municipio 31 kmMaricao Municipio 36 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
10:38 am AST on 29 April 2024 ()
Where
15 km (9 mi) south-southwest of Guánica, PR · earthquakes near Guánica
Magnitude
M 3.7 (md)
Depth
12 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Guánica Municipio, 12 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 850 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 75 km (47 mi) from the epicentre. In Guánica, 15 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: Yauco 23 km, intensity III · Guayanilla 25 km, intensity III · Magas Arriba 27 km, intensity III · San Germán 28 km, intensity III · Pole Ojea 29 km, intensity III · Tallaboa 29 km, intensity III · Tallaboa Alta 35 km, intensity II · Puerto Real 36 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 5.4 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 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× 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 5.4 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 11,000 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 17.8463, -66.9460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 12 km (7 mi) NNE earthquakes near Guánica Municipio
Lajas Municipio, PR 18 km (11 mi) NW earthquakes near Lajas Municipio
Guayanilla Municipio, PR 24 km (15 mi) NE earthquakes near Guayanilla Municipio
Sabana Grande Municipio, PR 26 km (16 mi) N earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 28 km (18 mi) NNE earthquakes near Yauco Municipio
Cabo Rojo Municipio, PR 30 km (19 mi) NW earthquakes near Cabo Rojo Municipio

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

Aftershocks so far

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

  1. 1.9 2 km W of Indios, Puerto Rico
  2. 2.5 4 km SSW of Indios, Puerto Rico
  3. 2.5 4 km S of Indios, Puerto Rico
  4. 2.8 3 km SW of Indios, Puerto Rico
  5. 2.3 2 km W of Indios, Puerto Rico
  6. 2.7 2 km SW of Indios, Puerto Rico
  7. 2.2 9 km SSE of Maria Antonia, Puerto Rico
  8. 2.4 5 km SSW of Indios, Puerto Rico
  9. 2.5 9 km SSE of Maria Antonia, Puerto Rico
  10. 2.8 10 km SSE of Indios, Puerto Rico
  11. 2.2 5 km SE of Maria Antonia, Puerto Rico
  12. 2.6 2 km ENE of Tallaboa, Puerto Rico
  13. 2.3 1 km N of Indios, Puerto Rico
  14. 2.4 8 km SW of Guánica, Puerto Rico
  15. 2.4 1 km S of Lluveras, 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.