M4.4 Earthquake 30 km N of Jōetsu, Japan — May 31, 2026
2026-05-31 20:54:37 UTC (2026-05-31) · approx. 5:54 AM UTC+9 local
On May 31, 2026 at 20:54 UTC, a magnitude 4.4 shallow crustal earthquake struck 30 km N of Jōetsu, Japan, at a depth of 10.0 km and coordinates 37.4171°, 138.1822°.
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
138.1822°E
Technical Information
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Common Questions
How strong was the magnitude 4.4 earthquake near Jōetsu, Japan?
The magnitude 4.4 earthquake that struck 30 km N of Jōetsu, Japan on May 31, 2026 at 20:54 UTC had a depth of 10.0 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: us7000spqa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 31, 2026). M4.4 Earthquake 30 km N of Jōetsu, Japan — May 31, 2026. Retrieved July 2, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000spqa/