M4.0 Earthquake 94 km ENE of Hachinohe, Japan — June 21, 2026
2026-06-21 21:56:03 UTC (2026-06-21) · approx. 7:56 AM UTC+10 local
On June 21, 2026 at 21:56 UTC, a magnitude 4.0 shallow crustal earthquake struck 94 km ENE of Hachinohe, Japan, at a depth of 49.8 km and coordinates 40.8188°, 142.5422°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
142.5422°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Hachinohe, Japan?
The magnitude 4.0 earthquake that struck 94 km ENE of Hachinohe, Japan on June 21, 2026 at 21:56 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000t8hd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, June 21, 2026). M4.0 Earthquake 94 km ENE of Hachinohe, Japan — June 21, 2026. Retrieved June 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000t8hd/