Earthquake · reviewed by a seismologist
M 3.3md
Earthquake near Isabel Segunda, PR
No earthquake was likely felt in Isabel Segunda in the 24 hours to 10:39 am AST (14:39 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 3.3 earthquake was recorded 24 km (15 mi) east-southeast of Isabel Segunda, PR, at 2:49 am AST on 24 October 2026 (06:49 UTC), 152 km deep.
USGS: 24 km ESE of Isabel Segunda, Puerto Rico
96 km (59 mi) ESE of San Juan, PR
- When
- 2:49 am AST on 24 October 2026 ()
- Where
- 24 km (15 mi) east-southeast of Isabel Segunda, PR · earthquakes near Isabel Segunda
- Magnitude
- M 3.3 (md)
- Depth
- 152 km below the surface
- Felt
- no reports yet
- Nearest
- Vieques Municipio, 22 km WNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 18 days ago
Earthquake alerts for Isabel Segunda, PR
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. In Isabel Segunda, 24 km away, the estimate is intensity I (not felt). 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, Culebra.
How big was it?
This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 130,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
- Magna, Utah 2020 M 5.7 4,000× the energy of this one
- This earthquake M 3.3 about 1.3 tons of TNT
- Around the size people start to feel M 3.0 this one released 2.8× more
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 4.8 on 2021-10-08 — about 180 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 18.0613, -65.2342. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Vieques Municipio, PR | 22 km (14 mi) | WNW | earthquakes near Vieques Municipio |
| Culebra Municipio, PR | 31 km (19 mi) | NNW | earthquakes near Culebra Municipio |
| Ceiba Municipio, PR | 46 km (29 mi) | WNW | earthquakes near Ceiba Municipio |
| Fajardo Municipio, PR | 52 km (32 mi) | NW | earthquakes near Fajardo Municipio |
| Naguabo Municipio, PR | 56 km (35 mi) | WNW | earthquakes near Naguabo Municipio |
| Humacao Municipio, PR | 59 km (37 mi) | W | earthquakes near Humacao Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
6 earthquakes have been recorded within 50 km since this one.
- 2.9 20 km WNW of Charlotte Amalie, U.S. Virgin Islands
- 2.9 22 km SE of Esperanza, Puerto Rico
- 2.6 23 km NNW of Saint Croix, U.S. Virgin Islands
- 2.5 10 km ESE of Esperanza, Puerto Rico
- 2.4 16 km SE of Esperanza, Puerto Rico
- 4.1 21 km SE 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
- 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.