Earthquake · reviewed by a seismologist
M 3.4md
Earthquake near Corozal, PR
USGS: 2 km NW of Corozal, Puerto Rico
29 km (18 mi) W of San Juan, PR · 18 km (11 mi) W of Bayamón, PR
- When
- 1:38 am AST on 3 October 2026 ()
- Where
- 3 km (2 mi) NW of Corozal, PR · earthquakes near Corozal
- Magnitude
- M 3.4 (md)
- Depth
- 111 km below the surface
- Felt
- no reports yet
- Nearest
- Corozal Municipio, 6 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2 hours ago
A magnitude 3.4 earthquake was recorded 3 km (2 mi) NW of Corozal, PR, at 1:38 am AST on 3 October 2026 (05:38 UTC). This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
Earthquakes near other towns within 30 km: Vega Alta, Miranda, H. Rivera Colon, Galateo, Río Lajas, Morovis.
How big was it?
This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 86,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 3,800× the energy of this one
- Magna, Utah 2020 M 5.7 2,700× the energy of this one
- This earthquake M 3.4 about 2 tons of TNT
- Around the size people start to feel M 3.0 this one released 4.1× 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 5.8 12 km N of Garrochales, Puerto Rico · 33 km NW of this epicentre
- 5.1 3 km W of Aguas Buenas, Puerto Rico · 24 km ESE of this epicentre
- 5.0 3 km N of Brenas, Puerto Rico · 16 km N of this epicentre
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 18.3593, -66.3335. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Corozal Municipio, PR | 6 km (4 mi) | S | earthquakes near Corozal Municipio |
| Vega Alta Municipio, PR | 9 km (5 mi) | N | earthquakes near Vega Alta Municipio |
| Toa Alta Municipio, PR | 9 km (6 mi) | E | earthquakes near Toa Alta Municipio |
| Morovis Municipio, PR | 10 km (6 mi) | WSW | earthquakes near Morovis Municipio |
| Naranjito Municipio, PR | 11 km (7 mi) | SE | earthquakes near Naranjito Municipio |
| Vega Baja Municipio, PR | 13 km (8 mi) | NNW | earthquakes near Vega Baja Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.