QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 4:30 pm AST (20:30 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 2.3 earthquake was recorded 22 km (14 mi) southeast of Isabel Segunda, PR, at 1:04 am AST on 31 March 2019 (05:04 UTC), 6.0 km deep.

USGS: 21 km SE of Isabel Segunda, Puerto Rico

93 km (58 mi) ESE of San Juan, PR

1:04 am AST, Mar 31, 2019 · · 6.0 km deep · released about 82 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 20 kmCulebra Municipio 33 kmCeiba Municipio 44 kmFajardo Municipio 51 kmNaguabo Municipio 53 kmHumacao Municipio 55 kmLuquillo Municipio 59 kmYabucoa Municipio 62 kmLas Piedras Municipio 65 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
1:04 am AST on 31 March 2019 ()
Where
22 km (14 mi) southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 2.3 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 20 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2783 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 19 km (12 mi) from the epicentre. In Isabel Segunda, 22 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: Esperanza.

How big was it?

This earthquake released about 82 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 82 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 1,000 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 18.0335, -65.2740. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 20 km (12 mi) WNW earthquakes near Vieques Municipio
Culebra Municipio, PR 33 km (20 mi) N earthquakes near Culebra Municipio
Ceiba Municipio, PR 44 km (27 mi) NW earthquakes near Ceiba Municipio
Fajardo Municipio, PR 51 km (32 mi) NW earthquakes near Fajardo Municipio
Naguabo Municipio, PR 53 km (33 mi) WNW earthquakes near Naguabo Municipio
Humacao Municipio, PR 55 km (34 mi) WNW earthquakes near Humacao Municipio

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

Aftershocks so far

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

  1. 2.5 24 km SE of Emajagua, Puerto Rico
  2. 1.6 25 km ESE of El Negro, Puerto Rico
  3. 1.6 21 km SE of El Negro, Puerto Rico
  4. 1.6 19 km ESE of El Negro, Puerto Rico
  5. 2.7 31 km SSW of Esperanza, Puerto Rico
  6. 2.5 Puerto Rico region
  7. 2.0 22 km ESE of El Negro, Puerto Rico
  8. 1.7 15 km E of Luis M. Cintron, Puerto Rico
  9. 1.7 7 km NE of Luis M. Cintron, Puerto Rico
  10. 2.2 9 km SSE of Daguao, Puerto Rico
  11. 2.1 36 km SSE of Esperanza, Puerto Rico
  12. 2.3 22 km SE of Esperanza, Puerto Rico
  13. 2.0 21 km ESE of El Negro, Puerto Rico
  14. 2.3 13 km S of Esperanza, Puerto Rico
  15. 2.2 36 km S of Charlotte Amalie, U.S. Virgin Islands

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.