M4.4 Earthquake in the Bonin Islands, Japan region — July 20, 2026
2026-07-20 18:44:32 UTC (6 hours ago) · approx. 3:44 AM UTC+9 local
On July 20, 2026 at 18:44 UTC, a magnitude 4.4 shallow crustal earthquake struck in the Bonin Islands, Japan region, at a depth of 10.0 km and coordinates 28.6560°, 142.4492°.
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
142.4492°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake in the Bonin Islands, Japan region?
The magnitude 4.4 earthquake that struck in the Bonin Islands, Japan region on July 20, 2026 at 18:44 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: us7000t20b). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 20, 2026). M4.4 Earthquake in the Bonin Islands, Japan region — July 20, 2026. Retrieved July 20, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t20b/