QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Earthquake near Santa Isabel, PR

No earthquake was likely felt in Santa Isabel in the 24 hours to 10:39 am AST (14:39 UTC). The last one was M 2.2, 9 km (6 mi) NE, at 5:05 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Santa Isabel

This page: a magnitude 3.3 earthquake was recorded 11 km (7 mi) south of Santa Isabel, PR, at 8:40 am AST on 1 November 2026 (12:40 UTC), 14 km deep.

USGS: 10 km S of Santa Isabel, Puerto Rico

26 km (16 mi) SE of Ponce, PR

8:40 am AST, Nov 1, 2026 · · 14 km deep · released about 1.3 tons of TNT

Every earthquake near Santa Isabel Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Isabel Municipio 10 kmJuana Díaz Municipio 16 kmSalinas Municipio 20 kmPonce Municipio 25 kmCoamo Municipio 27 kmVillalba Municipio 30 kmGuayama Municipio 32 kmAibonito Municipio 33 kmPeñuelas Municipio 37 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
8:40 am AST on 1 November 2026 ()
Where
11 km (7 mi) south of Santa Isabel, PR · earthquakes near Santa Isabel
Magnitude
M 3.3 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 10 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 10 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 49 km (30 mi) from the epicentre. In Santa Isabel, 11 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: Santa Isabel 11 km, intensity III · Río Cañas Abajo 20 km, intensity II · Coamo 24 km, intensity II · Ponce 27 km, intensity II · Tallaboa 35 km, intensity II · Guayama 35 km, intensity II · Tallaboa Alta 36 km, intensity II · Cayey 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,300× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.6× 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 48,000 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 17.8685, -66.4183. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Santa Isabel Municipio, PR 10 km (6 mi) NNE earthquakes near Santa Isabel Municipio
Juana Díaz Municipio, PR 16 km (10 mi) NNW earthquakes near Juana Díaz Municipio
Salinas Municipio, PR 20 km (12 mi) NE earthquakes near Salinas Municipio
Ponce Municipio, PR 25 km (15 mi) NW earthquakes near Ponce Municipio
Coamo Municipio, PR 27 km (17 mi) NNE earthquakes near Coamo Municipio
Villalba Municipio, PR 30 km (18 mi) N earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 2.0 2 km SW of Indios, Puerto Rico
  2. 2.1 0 km NNW of Guayanilla, Puerto Rico
  3. 2.2 1 km WNW of Mariano Colón, Puerto Rico
  4. 2.1 2 km E of Magas Arriba, Puerto Rico
  5. 3.0 8 km SSE of Maria Antonia, Puerto Rico
  6. 1.5 0 km SSW of Barranquitas, Puerto Rico
  7. 2.5 1 km NW of Magas Arriba, Puerto Rico
  8. 2.2 0 km NW of Aguilita, Puerto Rico
  9. 2.2 1 km NW of Indios, Puerto Rico
  10. 3.0 13 km S of Santa Isabel, Puerto Rico
  11. 2.8 3 km WNW of Orocovis, Puerto Rico
  12. 2.1 11 km S of Jauca, Puerto Rico
  13. 1.7 11 km S of Santa Isabel, Puerto Rico
  14. 2.8 8 km SSE of Maria Antonia, Puerto Rico
  15. 1.9 10 km SSE of Maria Antonia, 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.