QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 1:58 am AST (05:58 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 3.0 earthquake was recorded 6 km (4 mi) southeast of Isabel Segunda, PR, at 11:42 am AST on 15 July 2026 (15:42 UTC), 19 km deep. 1 person has reported feeling it to USGS.

USGS: 6 km SE of Isabel Segunda, Puerto Rico

77 km (48 mi) ESE of San Juan, PR

11:42 am AST, Jul 15, 2026 · · 19 km deep · released about 990 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 4 kmCulebra Municipio 26 kmCeiba Municipio 28 kmFajardo Municipio 36 kmNaguabo Municipio 37 kmHumacao Municipio 41 kmLuquillo Municipio 43 kmYabucoa Municipio 49 kmLas Piedras Municipio 50 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
11:42 am AST on 15 July 2026 ()
Where
6 km (4 mi) southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 3.0 (md)
Depth
19 km below the surface
Felt
1 report
Nearest
Vieques Municipio, 4 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 100 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 32 km (20 mi) from the epicentre. In Isabel Segunda, 6 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.

Likely felt in: Isabel Segunda 6 km, intensity II · Esperanza 7 km, intensity II · Culebra 24 km, intensity II · Aguas Claras 31 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 480 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 18.1098, -65.4028. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 4 km (2 mi) WNW earthquakes near Vieques Municipio
Culebra Municipio, PR 26 km (16 mi) NNE earthquakes near Culebra Municipio
Ceiba Municipio, PR 28 km (17 mi) NW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 36 km (23 mi) NNW earthquakes near Fajardo Municipio
Naguabo Municipio, PR 37 km (23 mi) WNW earthquakes near Naguabo Municipio
Humacao Municipio, PR 41 km (25 mi) W earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 2.9 22 km SE of Emajagua, Puerto Rico
  2. 2.9 20 km WNW of Charlotte Amalie, U.S. Virgin Islands
  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. 2.2 27 km SE of Emajagua, Puerto Rico
  10. 3.0 26 km SE of Emajagua, Puerto Rico
  11. 3.2 40 km SE of Esperanza, Puerto Rico
  12. 2.9 8 km WNW of Culebra, Puerto Rico
  13. 3.1 12 km SE of Emajagua, Puerto Rico
  14. 3.1 16 km SE of Esperanza, Puerto Rico
  15. 3.2 7 km ENE of Fajardo, 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.