M4.0 Earthquake 178 km NW of Mikuni, Japan — August 26, 2025
2025-08-26 22:20:46 UTC (2025-08-26) · approx. 7:20 AM UTC+9 local
On August 26, 2025 at 22:20 UTC, a magnitude 4.0 deep-focus earthquake struck 178 km NW of Mikuni, Japan, at a depth of 365.4 km and coordinates 37.4432°, 134.8531°.
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
134.8531°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Mikuni, Japan?
The magnitude 4.0 earthquake that struck 178 km NW of Mikuni, Japan on August 26, 2025 at 22:20 UTC had a depth of 365.4 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.
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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: us7000qr76). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 26, 2025). M4.0 Earthquake 178 km NW of Mikuni, Japan — August 26, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qr76/