QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7Md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 10:25 am AST (14:25 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 2.7 earthquake was recorded 6 km (4 mi) east of Isabel Segunda, PR, at 4:57 am AST on 3 April 2017 (08:57 UTC), 8.0 km deep.

USGS: 6 km E of Isabel Segunda, Puerto Rico

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

4:57 am AST, Apr 3, 2017 · · 8.0 km deep · released about 340 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 5 kmCulebra Municipio 22 kmCeiba Municipio 28 kmFajardo Municipio 34 kmNaguabo Municipio 38 kmHumacao Municipio 42 kmLuquillo Municipio 42 kmRío Grande Municipio 51 kmYabucoa Municipio 51 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
4:57 am AST on 3 April 2017 ()
Where
6 km (4 mi) east of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 2.7 (Md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 5 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3509 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 24 km (15 mi) from the epicentre. In Isabel Segunda, 6 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: Isabel Segunda 6 km, intensity III · Esperanza 10 km, intensity III · Culebra 20 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 4.3 on 2016-09-02 — about 250 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 18.1434, -65.3862. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 5 km (3 mi) WSW earthquakes near Vieques Municipio
Culebra Municipio, PR 22 km (14 mi) NNE earthquakes near Culebra Municipio
Ceiba Municipio, PR 28 km (17 mi) WNW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 34 km (21 mi) NW earthquakes near Fajardo Municipio
Naguabo Municipio, PR 38 km (23 mi) WNW earthquakes near Naguabo Municipio
Humacao Municipio, PR 42 km (26 mi) W earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 1.9 13 km SSW of Charlotte Amalie, U.S. Virgin Islands
  2. 1.9 10 km ESE of Punta Santiago, Puerto Rico
  3. 1.8 32 km S of Charlotte Amalie, U.S. Virgin Islands
  4. 2.6 36 km S of Charlotte Amalie, U.S. Virgin Islands
  5. 1.9 23 km SSW of Charlotte Amalie, U.S. Virgin Islands
  6. 2.1 28 km SE of El Negro, Puerto Rico
  7. 2.3 27 km ESE of El Negro, Puerto Rico
  8. 2.7 28 km SE of El Negro, Puerto Rico
  9. 2.4 26 km ESE of El Negro, Puerto Rico
  10. 2.4 26 km SE of El Negro, Puerto Rico
  11. 2.0 27 km SE of El Negro, Puerto Rico
  12. 2.0 30 km SE of El Negro, Puerto Rico
  13. 1.9 19 km SW of Esperanza, Puerto Rico
  14. 2.3 Puerto Rico region
  15. 2.1 11 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.