LIGHT EARTHQUAKE
92 km SSW of Unalaska, Alaska
A magnitude 4.0 earthquake struck 92 km SSW of Unalaska, Alaska on 15 Sept 2026, 05:21 UTC. The hypocentre was 18.4 km below the surface — shallow by seismological convention. 35 other earthquakes above our reporting threshold have been recorded within 250 km in the past 30 days.
- Depth
- 18.4 km
- Latitude
- 53.10°N
- Time
- 05:21 UTC
- Magnitude
- M4.0
shallow
167.03°W longitude
15 Sept 2026
ml
EPICENTRE
MAGNITUDE 4.0
Noticeable shaking of indoor objects. Damage is unlikely.
The scale is logarithmic: this released about 32 times the energy of a magnitude 3.0, roughly the energy of 15 tonnes of TNT.
18.4 KM DEEP
Shallow earthquakes release their energy close to the surface, so they are felt more strongly, and do more damage, than deeper earthquakes of the same magnitude.
NEARBY IN THE PAST 30 DAYS
35 earthquakes above our reporting threshold within 250 km of this one, the largest a magnitude 6.3.
OTHER RECENT EARTHQUAKES
18 Sept 2026, 02:12 UTC · 36.3 km deep
18 Sept 2026, 01:29 UTC · 106 km deep
18 Sept 2026, 01:07 UTC · 53.9 km deep
17 Sept 2026, 22:11 UTC · 82.7 km deep