QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 7:41 pm AST (23:41 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 2.5 earthquake was recorded 28 km (18 mi) south-southeast of Isabel Segunda, PR, at 3:55 am AST on 1 October 2019 (07:55 UTC), 14 km deep.

USGS: Puerto Rico region

91 km (56 mi) SE of San Juan, PR

3:55 am AST, Oct 1, 2019 · · 14 km deep · released about 140 lb of TNT

Every earthquake near Isabel Segunda Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vieques Municipio 26 kmCeiba Municipio 46 kmCulebra Municipio 48 kmHumacao Municipio 50 kmNaguabo Municipio 50 kmYabucoa Municipio 53 kmMaunabo Municipio 55 kmFajardo Municipio 58 kmLas Piedras Municipio 60 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
3:55 am AST on 1 October 2019 ()
Where
28 km (18 mi) south-southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude
M 2.5 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Vieques Municipio, 26 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2598 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 17 km (11 mi) from the epicentre. In Isabel Segunda, 28 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 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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 in our catalogue was M 4.3 on 2016-09-02 — about 600 times the energy of this one.

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 17.8995, -65.3885. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vieques Municipio, PR 26 km (16 mi) N earthquakes near Vieques Municipio
Ceiba Municipio, PR 46 km (29 mi) NNW earthquakes near Ceiba Municipio
Culebra Municipio, PR 48 km (30 mi) N earthquakes near Culebra Municipio
Humacao Municipio, PR 50 km (31 mi) WNW earthquakes near Humacao Municipio
Naguabo Municipio, PR 50 km (31 mi) NW earthquakes near Naguabo Municipio
Yabucoa Municipio, PR 53 km (33 mi) WNW earthquakes near Yabucoa Municipio

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

Aftershocks so far

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

  1. 3.3 26 km SE of El Negro, Puerto Rico
  2. 2.8 25 km SE of Emajagua, Puerto Rico
  3. 3.0 13 km NNW of Isabel Segunda, Puerto Rico
  4. 2.7 24 km SE of Emajagua, Puerto Rico
  5. 3.1 23 km SW of Esperanza, Puerto Rico
  6. 3.1 15 km SW of Esperanza, Puerto Rico
  7. 2.4 21 km SE of Emajagua, Puerto Rico
  8. 2.9 23 km SE of Emajagua, Puerto Rico
  9. 3.0 21 km SE of El Negro, Puerto Rico
  10. 3.2 21 km S of Esperanza, Puerto Rico
  11. 3.7 14 km N of Isabel Segunda, Puerto Rico
  12. 3.5 10 km SSE of Esperanza, Puerto Rico
  13. 3.5 35 km NNW of Saint Croix, U.S. Virgin Islands
  14. 3.4 26 km SSW of Esperanza, Puerto Rico
  15. 3.4 35 km SSW 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.