M4.0 Earthquake 31 km E of Hachinohe, Japan — August 7, 2026
2026-08-07 21:29:07 UTC (2026-08-07) · approx. 6:29 AM UTC+9 local
On August 7, 2026 at 21:29 UTC, a magnitude 4.0 shallow crustal earthquake struck 31 km E of Hachinohe, Japan, at a depth of 68.1 km and coordinates 40.4662°, 141.8669°.
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
141.8669°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Hachinohe, Japan?
The magnitude 4.0 earthquake that struck 31 km E of Hachinohe, Japan on August 7, 2026 at 21:29 UTC had a depth of 68.1 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 4.0 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tjzn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 7, 2026). M4.0 Earthquake 31 km E of Hachinohe, Japan — August 7, 2026. Retrieved August 30, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tjzn/