Earthquake · reviewed by a seismologist
M 3.0md
Earthquake near Loíza, PR
No earthquake was likely felt in Loíza in the 24 hours to 4:31 am AST (08:31 UTC). The last one was M 4.1, 78 km (48 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Loíza
This page: a magnitude 3.0 earthquake was recorded 50 km (31 mi) north of Loíza, PR, at 11:16 pm AST on 26 October 2026 (03:16 UTC), 36 km deep.
USGS: 49 km N of Suárez, Puerto Rico
59 km (37 mi) NNE of San Juan, PR · 55 km (34 mi) NNE of Carolina, PR
- When
- 11:16 pm AST on 26 October 2026 ()
- Where
- 50 km (31 mi) north of Loíza, PR · earthquakes near Loíza
- Magnitude
- M 3.0 (md)
- Depth
- 36 km below the surface
- Felt
- no reports yet
- Nearest
- Loíza Municipio, 50 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 15 days ago
Earthquake alerts for Loíza, PR
Get a notification in this browser when USGS records an earthquake near Loíza, PR. No account or email needed.
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, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. In Loíza, 50 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 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 310,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 14,000× the energy of this one
- Magna, Utah 2020 M 5.7 9,800× the energy of this one
- This earthquake M 3.0 about 1,100 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 4.2 on 2023-12-25 — about 50 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.1 92 km N of Suárez, Puerto Rico · 44 km N of this epicentre
- 5.0 73 km NNE of Vieques, Puerto Rico · 35 km ENE 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 18.8712, -65.7982. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Loíza Municipio, PR | 50 km (31 mi) | SSW | earthquakes near Loíza Municipio |
| Río Grande Municipio, PR | 55 km (34 mi) | S | earthquakes near Río Grande Municipio |
| Carolina Municipio, PR | 56 km (35 mi) | SSW | earthquakes near Carolina Municipio |
| Luquillo Municipio, PR | 57 km (35 mi) | S | earthquakes near Luquillo Municipio |
| San Juan Municipio, PR | 58 km (36 mi) | SSW | earthquakes near San Juan Municipio |
| Fajardo Municipio, PR | 58 km (36 mi) | SSE | earthquakes near Fajardo Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 3.1 53 km NNW of Culebra, Puerto Rico
- 2.9 75 km NNE of Vieques, Puerto Rico
- 3.0 52 km N of San Juan, Puerto Rico
- 3.1 62 km NNE of Luquillo, 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.