M4.4 Earthquake 76 km ESE of Tomioka, Japan — September 4, 2023
2023-09-04 21:12:40 UTC (2023-09-04) · approx. 6:12 AM UTC+9 local
On September 4, 2023 at 21:12 UTC, a magnitude 4.4 shallow crustal earthquake struck 76 km ESE of Tomioka, Japan, at a depth of 35.0 km and coordinates 37.0131°, 141.7745°.
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
141.7745°E
Technical Information
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Common Questions
How strong was the magnitude 4.4 earthquake near Tomioka, Japan?
The magnitude 4.4 earthquake that struck 76 km ESE of Tomioka, Japan on September 4, 2023 at 21:12 UTC had a depth of 35.0 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: us7000kt8t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 4, 2023). M4.4 Earthquake 76 km ESE of Tomioka, Japan — September 4, 2023. Retrieved November 17, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kt8t/