M4.1 Earthquake 117 km ESE of Yamada, Japan — July 31, 2026
2026-07-31 22:01:54 UTC (4 hours ago) · approx. 8:01 AM UTC+10 local
On July 31, 2026 at 22:01 UTC, a magnitude 4.1 shallow crustal earthquake struck 117 km ESE of Yamada, Japan, at a depth of 28.1 km and coordinates 39.2159°, 143.2752°.
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
143.2752°E
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Common Questions
How strong was the magnitude 4.1 earthquake near Yamada, Japan?
The magnitude 4.1 earthquake that struck 117 km ESE of Yamada, Japan on July 31, 2026 at 22:01 UTC had a depth of 28.1 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: us6000thci). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 31, 2026). M4.1 Earthquake 117 km ESE of Yamada, Japan — July 31, 2026. Retrieved August 1, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000thci/