M4.0 Earthquake 18 km W of Oketo, Japan — May 15, 2026
2026-05-15 18:47:19 UTC (2026-05-15) · approx. 4:47 AM UTC+10 local
On May 15, 2026 at 18:47 UTC, a magnitude 4.0 intermediate depth earthquake struck 18 km W of Oketo, Japan, at a depth of 169.0 km and coordinates 43.6594°, 143.3616°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.3616°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Oketo, Japan?
The magnitude 4.0 earthquake that struck 18 km W of Oketo, Japan on May 15, 2026 at 18:47 UTC had a depth of 169.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000szb1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 15, 2026). M4.0 Earthquake 18 km W of Oketo, Japan — May 15, 2026. Retrieved May 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000szb1/