M4.0 Earthquake 133 km SE of Hiroo, Japan — October 12, 2025
2025-10-12 20:18:55 UTC (2025-10-12) · approx. 6:18 AM UTC+10 local
On October 12, 2025 at 20:18 UTC, a magnitude 4.0 shallow crustal earthquake struck 133 km SE of Hiroo, Japan, at a depth of 24.5 km and coordinates 41.3728°, 144.3514°.
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
144.3514°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Hiroo, Japan?
The magnitude 4.0 earthquake that struck 133 km SE of Hiroo, Japan on October 12, 2025 at 20:18 UTC had a depth of 24.5 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: us6000rksi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 12, 2025). M4.0 Earthquake 133 km SE of Hiroo, Japan — October 12, 2025. Retrieved January 1, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rksi/