QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 9:35 am AST (13:35 UTC). The last one was M 2.9, 26 km (16 mi) SSE, at 12:08 pm AST on 29 October 2026, estimated intensity II (weak) in town. Every earthquake near Isabel Segunda

This page: a magnitude 2.5 earthquake was recorded 14 km (9 mi) north of Isabel Segunda, PR, at 9:47 am AST on 20 July 2026 (13:47 UTC), 20 km deep.

USGS: 14 km N of Isabel Segunda, Puerto Rico

65 km (40 mi) ESE of San Juan, PR · 56 km (35 mi) ESE of Carolina, PR

9:47 am AST, Jul 20, 2026 · · 20 km deep · released about 180 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ceiba Municipio 16 kmVieques Municipio 17 kmCulebra Municipio 18 kmFajardo Municipio 18 kmLuquillo Municipio 28 kmNaguabo Municipio 29 kmRío Grande Municipio 37 kmHumacao Municipio 37 kmLas Piedras Municipio 44 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
9:47 am AST on 20 July 2026 ()
Where
14 km (9 mi) north of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 2.5 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Ceiba Municipio, 16 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 114 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 11 km (7 mi) from the epicentre. In Isabel Segunda, 14 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: Culebra, Luis M. Cintron, Esperanza, Aguas Claras, Fajardo, Daguao.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 86,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 61,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.4× the energy of this one
  4. This earthquake M 2.5 about 180 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 4.8 on 2021-10-08 — about 2,700 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 18.2757, -65.4670. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ceiba Municipio, PR 16 km (10 mi) W earthquakes near Ceiba Municipio
Vieques Municipio, PR 17 km (11 mi) SSE earthquakes near Vieques Municipio
Culebra Municipio, PR 18 km (11 mi) ENE earthquakes near Culebra Municipio
Fajardo Municipio, PR 18 km (11 mi) NW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 28 km (17 mi) WNW earthquakes near Luquillo Municipio
Naguabo Municipio, PR 29 km (18 mi) WSW earthquakes near Naguabo Municipio

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

Aftershocks so far

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

  1. 2.9 20 km WNW of Charlotte Amalie, U.S. Virgin Islands
  2. 3.1 33 km NNW of Culebra, Puerto Rico
  3. 2.2 7 km ESE of Emajagua, Puerto Rico
  4. 2.9 22 km SE of Esperanza, Puerto Rico
  5. 2.5 10 km ESE of Esperanza, Puerto Rico
  6. 2.4 16 km SE of Esperanza, Puerto Rico
  7. 4.1 21 km SE of Esperanza, Puerto Rico
  8. 3.3 24 km ESE of Isabel Segunda, Puerto Rico
  9. 2.9 8 km WNW of Culebra, Puerto Rico
  10. 3.1 16 km SE of Esperanza, Puerto Rico
  11. 3.2 7 km ENE of Fajardo, Puerto Rico
  12. 3.1 2 km SW of Hato Candal, Puerto Rico
  13. 3.1 14 km SSE of Esperanza, Puerto Rico
  14. 2.9 17 km S of Esperanza, Puerto Rico
  15. 2.9 16 km SSE of Esperanza, 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.