Earthquake · reviewed by a seismologist
M 3.1md
85 km SW of Pole Ojea, Puerto Rico
Yes. A magnitude 3.1 earthquake was recorded 85 km SW of Pole Ojea, Puerto Rico, at 7:11 pm AST on 25 January 2018 (23:11 UTC), 51 km deep.
- When
- Magnitude
- M 3.1 (md)
- Depth
- 51 km below the surface
- Felt
- no reports yet
- Nearest
- Mayagüez Municipio, 76 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3213 days ago
Earthquake alerts for Pole Ojea, 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. 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 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 230,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,400× the energy of this one
- This earthquake M 3.1 about 1,400 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.5× 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 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 17.4180, -67.7448. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mayagüez Municipio, PR | 76 km (47 mi) | NNW | earthquakes near Mayagüez Municipio |
| Cabo Rojo Municipio, PR | 88 km (55 mi) | NE | earthquakes near Cabo Rojo Municipio |
| Lajas Municipio, PR | 97 km (60 mi) | NE | earthquakes near Lajas Municipio |
| Hormigueros Municipio, PR | 104 km (65 mi) | NE | earthquakes near Hormigueros Municipio |
| Guánica Municipio, PR | 105 km (65 mi) | NE | earthquakes near Guánica Municipio |
| San Germán Municipio, PR | 107 km (67 mi) | NE | earthquakes near San Germán Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
32 earthquakes have been recorded within 50 km since this one.
- 2.7 102 km WSW of Pole Ojea, Puerto Rico
- 3.2 46 km SW of Pole Ojea, Puerto Rico
- 3.5 Puerto Rico region
- 3.0 40 km SW of Pole Ojea, Puerto Rico
- 2.5 45 km SSW of Pole Ojea, Puerto Rico
- 2.4 54 km SSW of Pole Ojea, Puerto Rico
- 3.4 110 km SSW of Pole Ojea, Puerto Rico
- 3.2 43 km SSW of Pole Ojea, Puerto Rico
- 3.0 83 km SW of Pole Ojea, Puerto Rico
- 2.5 98 km SSW of Pole Ojea, Puerto Rico
- 1.8 74 km SSW of Pole Ojea, Puerto Rico
- 2.9 90 km WSW of Pole Ojea, Puerto Rico
- 2.4 43 km SW of Pole Ojea, Puerto Rico
- 2.8 95 km SW of Pole Ojea, Puerto Rico
- 2.9 50 km SSW of Pole Ojea, 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.