M4.4 Earthquake 70 km NNW of Uken, Japan — September 18, 2026
2026-09-18 16:27:16 UTC (1 day ago) · approx. 1:27 AM UTC+9 local
On September 18, 2026 at 16:27 UTC, a magnitude 4.4 shallow crustal earthquake struck 70 km NNW of Uken, Japan, at a depth of 10.0 km and coordinates 28.8405°, 128.8492°.
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
128.8492°E
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Common Questions
How strong was the magnitude 4.4 earthquake near Uken, Japan?
The magnitude 4.4 earthquake that struck 70 km NNW of Uken, Japan on September 18, 2026 at 16:27 UTC had a depth of 10.0 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 4.4 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: us7000tir5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 18, 2026). M4.4 Earthquake 70 km NNW of Uken, Japan — September 18, 2026. Retrieved September 20, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tir5/