Earthquake · reviewed by a seismologist
M 3.0md
Earthquake near Emajagua, PR
Yes. A magnitude 3.0 earthquake was recorded 26 km (16 mi) SE of Emajagua, PR, at 12:33 am AST on 15 October 2026 (04:33 UTC), 5.5 km deep. No felt reports to USGS yet.
USGS: 26 km SE of Emajagua, Puerto Rico
74 km (46 mi) SSE of San Juan, PR · 57 km (35 mi) SE of Caguas, PR
- When
- 12:33 am AST on 15 October 2026 ()
- Where
- 26 km (16 mi) SE of Emajagua, PR · earthquakes near Emajagua
- Magnitude
- M 3.0 (md)
- Depth
- 5.5 km below the surface
- Felt
- no reports yet
- Nearest
- Maunabo Municipio, 27 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1 hour ago
Earthquake alerts for Emajagua, PR
Get a notification in this browser when USGS records an earthquake near Emajagua, 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 35 km (22 mi) from the epicentre. In Emajagua, 26 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.
Likely felt in: Emajagua 26 km, intensity II · El Negro 28 km, intensity II · Lamboglia 33 km, intensity II · Candelero Arriba 33 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 890 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 6.7 380,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
- Magna, Utah 2020 M 5.7 12,000× the energy of this one
- This earthquake M 3.0 about 890 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 4.8 on 2021-10-08 — about 540 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.3 68 km SSE of Emajagua, Puerto Rico · 47 km S 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 17.8225, -65.7192. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Maunabo Municipio, PR | 27 km (17 mi) | NW | earthquakes near Maunabo Municipio |
| Yabucoa Municipio, PR | 30 km (19 mi) | NNW | earthquakes near Yabucoa Municipio |
| Patillas Municipio, PR | 35 km (21 mi) | NW | earthquakes near Patillas Municipio |
| Humacao Municipio, PR | 36 km (22 mi) | NNW | earthquakes near Humacao Municipio |
| Arroyo Municipio, PR | 38 km (24 mi) | WNW | earthquakes near Arroyo Municipio |
| Naguabo Municipio, PR | 43 km (27 mi) | N | earthquakes near Naguabo 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.