QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 5:31 pm AST (21:31 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 2.6 earthquake was recorded 12 km (7 mi) west-northwest of Isabel Segunda, PR, at 1:51 am AST on 17 May 2019 (05:51 UTC), 1.0 km deep.

USGS: 11 km WNW of Isabel Segunda, Puerto Rico

60 km (37 mi) ESE of San Juan, PR · 52 km (32 mi) ESE of Carolina, PR

1:51 am AST, May 17, 2019 · · 1.0 km deep · released about 250 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ceiba Municipio 10 kmVieques Municipio 14 kmNaguabo Municipio 20 kmFajardo Municipio 22 kmLuquillo Municipio 26 kmHumacao Municipio 26 kmCulebra Municipio 29 kmRío Grande Municipio 34 kmLas Piedras Municipio 35 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
1:51 am AST on 17 May 2019 ()
Where
12 km (7 mi) west-northwest of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 2.6 (md)
Depth
1.0 km below the surface
Felt
no reports yet
Nearest
Ceiba Municipio, 10 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2736 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, 12 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 12 km, intensity III · Aguas Claras 13 km, intensity II · Esperanza 13 km, intensity II · Fajardo 18 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 250 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 61,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 43,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.8× the energy of this one
  4. This earthquake M 2.6 about 250 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 4.6 on 2016-12-05 — about 970 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 18.1948, -65.5445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ceiba Municipio, PR 10 km (6 mi) NW earthquakes near Ceiba Municipio
Vieques Municipio, PR 14 km (9 mi) ESE earthquakes near Vieques Municipio
Naguabo Municipio, PR 20 km (13 mi) W earthquakes near Naguabo Municipio
Fajardo Municipio, PR 22 km (14 mi) NNW earthquakes near Fajardo Municipio
Luquillo Municipio, PR 26 km (16 mi) NW earthquakes near Luquillo Municipio
Humacao Municipio, PR 26 km (16 mi) WSW earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 1.7 15 km E of Luis M. Cintron, Puerto Rico
  2. 1.7 7 km NE of Luis M. Cintron, Puerto Rico
  3. 2.2 9 km SSE of Daguao, Puerto Rico
  4. 2.1 36 km SSE of Esperanza, Puerto Rico
  5. 2.3 22 km SE of Esperanza, Puerto Rico
  6. 2.7 10 km S of Emajagua, Puerto Rico
  7. 1.8 2 km WNW of Humacao, Puerto Rico
  8. 2.0 21 km ESE of El Negro, Puerto Rico
  9. 1.8 25 km NNE of Luquillo, Puerto Rico
  10. 2.5 23 km NNE of Luquillo, Puerto Rico
  11. 2.3 13 km S of Esperanza, Puerto Rico
  12. 2.7 28 km NE of Luquillo, Puerto Rico
  13. 1.9 17 km S of Esperanza, Puerto Rico
  14. 2.6 11 km SE of Isabel Segunda, Puerto Rico
  15. 2.7 31 km SE 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.