M4.1 Earthquake in the Bonin Islands, Japan region — July 27, 2026
2026-07-27 23:20:46 UTC (2 hours ago) · approx. 8:20 AM UTC+9 local
On July 27, 2026 at 23:20 UTC, a magnitude 4.1 deep-focus earthquake struck in the Bonin Islands, Japan region, at a depth of 462.2 km and coordinates 27.1167°, 140.1742°.
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
140.1742°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake in the Bonin Islands, Japan region?
The magnitude 4.1 earthquake that struck in the Bonin Islands, Japan region on July 27, 2026 at 23:20 UTC had a depth of 462.2 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: us6000tg99). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 27, 2026). M4.1 Earthquake in the Bonin Islands, Japan region — July 27, 2026. Retrieved July 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tg99/