M5.5 Earthquake in the Volcano Islands, Japan region — October 4, 2026
2026-10-04 11:12:48 UTC (1 hour ago) · approx. 9:12 PM UTC+10 local
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On October 4, 2026 at 11:12 UTC, a magnitude 5.5 shallow crustal earthquake struck in the Volcano Islands, Japan region, at a depth of 10.0 km and coordinates 22.8286°, 144.6734°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 101 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 465, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.5 releases seismic energy equivalent to roughly 3 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.8 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
144.6734°E
Technical Information
Common Questions
How strong was the magnitude 5.5 earthquake in the Volcano Islands, Japan region?
The magnitude 5.5 earthquake that struck in the Volcano Islands, Japan region on October 4, 2026 at 11:12 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 22.8286°, 144.6734°, which is in the Volcano Islands, Japan region. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.5 earthquakes can continue for days to weeks and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 5.5 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000tzid). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 4, 2026). M5.5 Earthquake in the Volcano Islands, Japan region — October 4, 2026. Retrieved October 4, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tzid/