Earthquake · reviewed by a seismologist
M 5.0ml
Rat Islands, Aleutian Islands, Alaska
- When
- Magnitude
- M 5.0 (ml)
- Depth
- 34 km below the surface
- Felt
- no reports yet
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Aleutians West Census Area, 117 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1 hour ago
This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.
How big was it?
This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 350× the energy of this one
- Mineral, Virginia 2011 M 5.8 16× the energy of this one
- Magna, Utah 2020 M 5.7 11× the energy of this one
- This earthquake M 5.0 about 480 tons of TNT
- Around the size people start to feel M 3.0 this one released 1,000× 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| measured intensity | 3.56 | 3.29 | |
| measured intensity | 3.48 | 3.56 |
Where
Epicentre 50.9080, 179.3350. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Aleutians West Census Area, AK | 117 km (73 mi) | S of here | earthquakes near Aleutians West Census Area |
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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.6 on 2026-09-27.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.