Earthquake near Isabel Segunda, PR

No earthquake was likely felt in Isabel Segunda in the 24 hours to 5:47 pm AST (21:47 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 2.0 earthquake was recorded 39 km (24 mi) south of Isabel Segunda, PR, at 2:42 am AST on 22 August 2018 (06:42 UTC), 15 km deep.

USGS: 33 km S of Esperanza, Puerto Rico

92 km (57 mi) SE of San Juan, PR

2:42 am AST, Aug 22, 2018 · 2018-08-22 06:42 UTC · 15 km deep · released about 31 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: 2:42 am AST on 22 August 2018 (2018-08-22 06:42 UTC)
Where: 39 km (24 mi) south of Isabel Segunda, PR · earthquakes near Isabel Segunda
Magnitude: M 2.0 (md)
Depth: 15 km below the surface
Felt: no reports yet
Nearest: Vieques Municipio, 37 km N
Status: Reviewed by a seismologist

USGS · last changed by USGS 3004 days ago · we first saw it 3004 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 6 km (4 mi) from the epicentre. In Isabel Segunda, 39 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 31 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 480,000× the energy of this one
Magna, Utah 2020 M 5.7 340,000× the energy of this one
Around the size people start to feel M 3.0 31× the energy of this one
This earthquake M 2.0 about 31 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 7,700 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

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Nearby places

Place	Distance	Direction from the epicentre
Vieques Municipio, PR	37 km (23 mi)	N	earthquakes near Vieques Municipio
Maunabo Municipio, PR	50 km (31 mi)	WNW	earthquakes near Maunabo Municipio
Humacao Municipio, PR	50 km (31 mi)	NW	earthquakes near Humacao Municipio
Yabucoa Municipio, PR	50 km (31 mi)	NW	earthquakes near Yabucoa Municipio
Ceiba Municipio, PR	53 km (33 mi)	NNW	earthquakes near Ceiba Municipio
Naguabo Municipio, PR	53 km (33 mi)	NNW	earthquakes near Naguabo Municipio

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

Aftershocks so far

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

1.9 26 km SE of El Negro, Puerto Rico 05:44 UTC
2.0 30 km SE of El Negro, Puerto Rico 07:03 UTC
2.6 17 km SE of Esperanza, Puerto Rico 14:42 UTC
1.8 10 km S of Emajagua, Puerto Rico 13:46 UTC
3.0 12 km S of Esperanza, Puerto Rico 00:06 UTC
2.5 26 km SSW of Esperanza, Puerto Rico 04:43 UTC
2.1 15 km SE of Punta Santiago, Puerto Rico 07:48 UTC
2.7 21 km SE of Esperanza, Puerto Rico 21:31 UTC
2.1 36 km SSE of Esperanza, Puerto Rico 01:46 UTC
2.2 29 km SSW of Esperanza, Puerto Rico 00:01 UTC
2.1 22 km SSE of Lamboglia, Puerto Rico 22:43 UTC
1.8 11 km S of Emajagua, Puerto Rico 02:45 UTC
2.1 23 km S of Emajagua, Puerto Rico 14:25 UTC
1.8 9 km SSW of Emajagua, Puerto Rico 10:46 UTC
2.2 24 km SE of Emajagua, Puerto Rico 02:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:47 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.