M4.1 Earthquake 56 km SE of Tomioka, Japan — September 13, 2023
2023-09-13 16:29:45 UTC (2023-09-13) · approx. 1:29 AM UTC+9 local
On September 13, 2023 at 16:29 UTC, a magnitude 4.1 shallow crustal earthquake struck 56 km SE of Tomioka, Japan, at a depth of 49.8 km and coordinates 37.0438°, 141.5366°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
141.5366°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Tomioka, Japan?
The magnitude 4.1 earthquake that struck 56 km SE of Tomioka, Japan on September 13, 2023 at 16:29 UTC had a depth of 49.8 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 4.1 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kviz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 13, 2023). M4.1 Earthquake 56 km SE of Tomioka, Japan — September 13, 2023. Retrieved November 18, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kviz/