M4.2 Earthquake in the Bonin Islands, Japan region — October 25, 2026
2026-10-25 02:47:49 UTC (54 min ago) · approx. 11:47 AM UTC+9 local
On October 25, 2026 at 02:47 UTC, a magnitude 4.2 deep-focus earthquake struck in the Bonin Islands, Japan region, at a depth of 499.8 km and coordinates 27.8771°, 139.7294°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 6.5 mainshock that occurred 1 hour ago in the Bonin Islands, Japan region. Since the mainshock, the USGS has recorded 2 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
Earthquake Details
139.7294°E
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Common Questions
How strong was the magnitude 4.2 earthquake in the Bonin Islands, Japan region?
The magnitude 4.2 earthquake that struck in the Bonin Islands, Japan region on October 25, 2026 at 02:47 UTC had a depth of 499.8 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 4.2 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M6.5 one earlier?
No. This magnitude 4.2 earthquake is an aftershock of the larger magnitude 6.5 mainshock that occurred earlier in the Bonin Islands, Japan region. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000u4ru). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 25, 2026). M4.2 Earthquake in the Bonin Islands, Japan region — October 25, 2026. Retrieved October 25, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000u4ru/