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 3:25 pm AST (19:25 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 7 km (4 mi) west of Isabel Segunda, PR, at 7:12 pm AST on 11 December 2019 (23:12 UTC), 8.0 km deep.

USGS: 7 km W of Isabel Segunda, Puerto Rico

65 km (40 mi) ESE of San Juan, PR · 57 km (35 mi) E of Caguas, PR

7:12 pm AST, Dec 11, 2019 · · 8.0 km deep · released about 360 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 9 kmCeiba Municipio 16 kmNaguabo Municipio 25 kmFajardo Municipio 27 kmCulebra Municipio 29 kmHumacao Municipio 29 kmLuquillo Municipio 32 kmYabucoa Municipio 38 kmLas Piedras Municipio 38 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
7:12 pm AST on 11 December 2019 ()
Where
7 km (4 mi) west 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, 9 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2527 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, 7 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 7 km, intensity III · Esperanza 7 km, intensity III · Aguas Claras 19 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 360 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 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 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 660 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 18.1516, -65.5101. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 9 km (5 mi) ESE earthquakes near Vieques Municipio
Ceiba Municipio, PR 16 km (10 mi) NW earthquakes near Ceiba Municipio
Naguabo Municipio, PR 25 km (15 mi) WNW earthquakes near Naguabo Municipio
Fajardo Municipio, PR 27 km (17 mi) NNW earthquakes near Fajardo Municipio
Culebra Municipio, PR 29 km (18 mi) NE earthquakes near Culebra Municipio
Humacao Municipio, PR 29 km (18 mi) W earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 2.2 25 km SE of Emajagua, Puerto Rico
  2. 2.2 26 km SE of Emajagua, Puerto Rico
  3. 2.0 24 km SE of Emajagua, Puerto Rico
  4. 2.0 23 km SE of Emajagua, Puerto Rico
  5. 2.4 24 km SE of Emajagua, Puerto Rico
  6. 2.6 23 km SE of Emajagua, Puerto Rico
  7. 2.6 24 km SE of Emajagua, Puerto Rico
  8. 2.0 25 km SE of Emajagua, Puerto Rico
  9. 2.6 23 km SE of Emajagua, Puerto Rico
  10. 2.2 5 km ESE of Aguas Claras, Puerto Rico
  11. 2.3 25 km SE of Emajagua, Puerto Rico
  12. 1.8 3 km E of El Negro, Puerto Rico
  13. 2.8 22 km SSW of Esperanza, Puerto Rico
  14. 2.7 26 km SE of El Negro, Puerto Rico
  15. 2.9 24 km S 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.