M4.4 Earthquake 1 km NW of Koga, Japan — February 11, 2025
2025-02-11 20:41:08 UTC (2025-02-11) · approx. 5:41 AM UTC+9 local
On February 11, 2025 at 20:41 UTC, a magnitude 4.4 shallow crustal earthquake struck 1 km NW of Koga, Japan, at a depth of 66.4 km and coordinates 36.1896°, 139.7071°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
139.7071°E
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Common Questions
How strong was the magnitude 4.4 earthquake near Koga, Japan?
The magnitude 4.4 earthquake that struck 1 km NW of Koga, Japan on February 11, 2025 at 20:41 UTC had a depth of 66.4 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000pd00). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, February 11, 2025). M4.4 Earthquake 1 km NW of Koga, Japan — February 11, 2025. Retrieved April 26, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pd00/