Earthquake · reviewed by a seismologist
M 2.8md
Earthquake near Las Marias, PR
USGS: 2 km S of Las Marías, Puerto Rico
100 km (62 mi) WSW of San Juan, PR · 16 km (10 mi) E of Mayagüez, PR
- When
- 11:01 pm AST on 9 October 2026 ()
- Where
- 18 km (11 mi) ESE of Las Marias, PR · earthquakes near Las Marias
- Magnitude
- M 2.8 (md)
- Depth
- 18 km below the surface
- Felt
- no reports yet
- Nearest
- Las Marías Municipio, 2 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2 hours ago
A magnitude 2.8 earthquake was recorded 18 km (11 mi) ESE of Las Marias, PR, at 11:01 pm AST on 9 October 2026 (03:01 UTC). This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Las Marias, 18 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: Maricao, San Sebastián, Juncal, Lares, Espino, Mayagüez.
How big was it?
This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
- Magna, Utah 2020 M 5.7 23,000× the energy of this one
- Around the size people start to feel M 3.0 2.1× the energy of this one
- This earthquake M 2.8 about 460 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 6.4 on 2020-01-07 — about 260,000 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 6 km WNW of Aguadilla, Puerto Rico · 33 km NW of this epicentre
- 6.1 15 km WNW of San Antonio, Puerto Rico · 44 km NW of this epicentre
- 6.1 18 km NNW of San Antonio, Puerto Rico · 50 km NNW of this epicentre
- 5.8 4 km E of Moca, Puerto Rico · 21 km NNW of this epicentre
- 5.2 19 km SW of Stella, Puerto Rico · 40 km W 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 18.2262, -66.9922. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Las Marías Municipio, PR | 2 km (1 mi) | E | earthquakes near Las Marías Municipio |
| Maricao Municipio, PR | 8 km (5 mi) | SE | earthquakes near Maricao Municipio |
| San Sebastián Municipio, PR | 12 km (7 mi) | NNE | earthquakes near San Sebastián Municipio |
| San Germán Municipio, PR | 14 km (9 mi) | SSW | earthquakes near San Germán Municipio |
| Lares Municipio, PR | 14 km (9 mi) | ENE | earthquakes near Lares Municipio |
| Añasco Municipio, PR | 16 km (10 mi) | WNW | earthquakes near Añasco 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.