M4.4 Earthquake 285 km ESE of Kamaishi, Japan — September 30, 2026
2026-09-30 18:29:20 UTC (2026-09-30) · approx. 4:29 AM UTC+10 local
On September 30, 2026 at 18:29 UTC, a magnitude 4.4 shallow crustal earthquake struck 285 km ESE of Kamaishi, Japan, at a depth of 19.2 km and coordinates 38.2182°, 144.8669°.
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
144.8669°E
Technical Information
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Common Questions
How strong was the magnitude 4.4 earthquake near Kamaishi, Japan?
The magnitude 4.4 earthquake that struck 285 km ESE of Kamaishi, Japan on September 30, 2026 at 18:29 UTC had a depth of 19.2 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: us6000u0ss). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 30, 2026). M4.4 Earthquake 285 km ESE of Kamaishi, Japan — September 30, 2026. Retrieved October 24, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000u0ss/