LIGHT EARTHQUAKE
6 km N of Ashikaga, Japan
A magnitude 4.2 earthquake struck 6 km N of Ashikaga, Japan on 25 Aug 2026, 23:33 UTC. The hypocentre was 78.3 km below the surface — intermediate by seismological convention. 9 other earthquakes above our reporting threshold have been recorded within 250 km in the past 30 days.
- Depth
- 78.3 km
- Latitude
- 36.40°N
- Time
- 23:33 UTC
- Magnitude
- M4.2
intermediate
139.44°E longitude
25 Aug 2026
mb
EPICENTRE
MAGNITUDE 4.2
Noticeable shaking of indoor objects. Damage is unlikely.
The scale is logarithmic: this released about 63 times the energy of a magnitude 3.0, roughly the energy of 30 tonnes of TNT.
78.3 KM DEEP
At this depth the energy spreads before it reaches the surface. Shaking is usually weaker than a shallow earthquake of the same size, but it can be felt across a wider area.
NEARBY IN THE PAST 30 DAYS
9 earthquakes above our reporting threshold within 250 km of this one, the largest a magnitude 5.8.
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