M4.6 Earthquake in the Volcano Islands, Japan region — April 23, 2026
2026-04-23 16:49:41 UTC (2026-04-23) · approx. 1:49 AM UTC+9 local
On April 23, 2026 at 16:49 UTC, a magnitude 4.6 shallow crustal earthquake struck in the Volcano Islands, Japan region, at a depth of 10.0 km and coordinates 23.1193°, 142.4501°. This earthquake was detected by 36 seismic stations with good location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
142.4501°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake in the Volcano Islands, Japan region?
The magnitude 4.6 earthquake that struck in the Volcano Islands, Japan region on April 23, 2026 at 16:49 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 23.1193°, 142.4501°, which is in the Volcano Islands, Japan region. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 4.6 event is significantly smaller than that historical record.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us7000shag). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, April 23, 2026). M4.6 Earthquake in the Volcano Islands, Japan region — April 23, 2026. Retrieved May 14, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000shag/