QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

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 1.7 earthquake was recorded 12 km (7 mi) south of Santa Isabel, PR, at 7:13 am AST on 4 November 2026 (11:13 UTC), 8.6 km deep.

USGS: 11 km S of Santa Isabel, Puerto Rico

70 km (43 mi) SSW of San Juan, PR · 29 km (18 mi) ESE of Ponce, PR

7:13 am AST, Nov 4, 2026 · · 8.6 km deep · released about 11 lb 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 18 kmSalinas Municipio 19 kmPonce Municipio 27 kmCoamo Municipio 27 kmGuayama Municipio 30 kmVillalba Municipio 31 kmAibonito Municipio 33 kmCayey 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
7:13 am AST on 4 November 2026 ()
Where
12 km (7 mi) south of Santa Isabel, PR · earthquakes near Santa Isabel
Magnitude
M 1.7 (md)
Depth
8.6 km below the surface
Felt
no reports yet
Nearest
Santa Isabel Municipio, 10 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 7 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 9 km (6 mi) from the epicentre. In Santa Isabel, 12 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.

Earthquakes near other towns within 30 km: Jauca, Playita Cortada, El Ojo, Las Ochenta, Parcelas Peñuelas, Salinas.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 11,000,000 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 17.8617, -66.3958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Santa Isabel Municipio, PR 10 km (6 mi) N earthquakes near Santa Isabel Municipio
Juana Díaz Municipio, PR 18 km (11 mi) NNW earthquakes near Juana Díaz Municipio
Salinas Municipio, PR 19 km (12 mi) NE earthquakes near Salinas Municipio
Ponce Municipio, PR 27 km (17 mi) NW earthquakes near Ponce Municipio
Coamo Municipio, PR 27 km (17 mi) N earthquakes near Coamo Municipio
Guayama Municipio, PR 30 km (19 mi) ENE earthquakes near Guayama Municipio

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

Aftershocks so far

12 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

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.