Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 9:49 pm AST (01:49 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 33 km (20 mi) east-southeast of Isabel Segunda, PR, at 3:48 am AST on 22 October 2016 (07:48 UTC), 7.0 km deep.

USGS: 32 km ESE of Esperanza, Puerto Rico

3:48 am AST, Oct 22, 2016 · 2016-10-22 07:48 UTC · 7.0 km deep · released about 85 lb of TNT

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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: 3:48 am AST on 22 October 2016 (2016-10-22 07:48 UTC)
Where: 33 km (20 mi) east-southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude: M 2.3 (Md)
Depth: 7.0 km below the surface
Felt: no reports yet
Nearest: Vieques Municipio, 30 km WNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 3673 days ago · we first saw it 3673 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, 33 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.

How big was it?

This earthquake released about 85 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.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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 lists one earthquake of M5 or more within 50 km:

5.0 29 km S of Cruz Bay, U.S. Virgin Islands · 47 km ENE of this epicentre Jan 9, 1990

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

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Nearby places

Place	Distance	Direction from the epicentre
Vieques Municipio, PR	30 km (19 mi)	WNW	earthquakes near Vieques Municipio
Culebra Municipio, PR	40 km (25 mi)	NNW	earthquakes near Culebra Municipio
Ceiba Municipio, PR	55 km (34 mi)	WNW	earthquakes near Ceiba Municipio
Fajardo Municipio, PR	61 km (38 mi)	NW	earthquakes near Fajardo Municipio
Naguabo Municipio, PR	63 km (39 mi)	WNW	earthquakes near Naguabo Municipio
Humacao Municipio, PR	65 km (41 mi)	WNW	earthquakes near Humacao Municipio

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

Aftershocks so far

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

1.6 5 km W of Esperanza, Puerto Rico 10:54 UTC
2.2 27 km SE of El Negro, Puerto Rico 10:47 UTC
2.7 30 km SSW of Charlotte Amalie, U.S. Virgin Islands 06:13 UTC
2.4 28 km SE of El Negro, Puerto Rico 22:27 UTC
1.5 32 km SSW of Charlotte Amalie, U.S. Virgin Islands 17:15 UTC
2.1 32 km SSW of Charlotte Amalie, U.S. Virgin Islands 16:32 UTC
2.0 24 km SSW of Charlotte Amalie, U.S. Virgin Islands 12:41 UTC
2.2 30 km SSW of Charlotte Amalie, U.S. Virgin Islands 12:11 UTC
3.0 24 km SW of Esperanza, Puerto Rico 21:58 UTC
2.5 26 km SW of Esperanza, Puerto Rico 18:19 UTC
2.3 27 km SW of Esperanza, Puerto Rico 14:59 UTC
2.1 Puerto Rico region 05:08 UTC
2.9 27 km SW of Esperanza, Puerto Rico 04:59 UTC
2.3 28 km SW of Esperanza, Puerto Rico 04:58 UTC
2.9 Puerto Rico region 04:44 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 01:49 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.