M4.1 Earthquake 8 km SE of Agano, Japan — July 13, 2026
2026-07-13 17:59:07 UTC (2026-07-13) · approx. 2:59 AM UTC+9 local
On July 13, 2026 at 17:59 UTC, a magnitude 4.1 intermediate depth earthquake struck 8 km SE of Agano, Japan, at a depth of 157.5 km and coordinates 37.7887°, 139.3040°.
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
139.3040°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Agano, Japan?
The magnitude 4.1 earthquake that struck 8 km SE of Agano, Japan on July 13, 2026 at 17:59 UTC had a depth of 157.5 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.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t1dc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 13, 2026). M4.1 Earthquake 8 km SE of Agano, Japan — July 13, 2026. Retrieved July 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t1dc/