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A light magnitude 4.1 earthquake struck near WESTERN HONSHU, JAPAN on Sunday, September 13, 2026 at 12:27:14 AM UTC. This deep-focus event (363.5 km depth) released energy equivalent to approximately 21 tons of TNT. Here is the verified NEIC telemetry, live epicenter map, and ground shaking assessment.
4.1MB
Light Seismic Class
363.5km
Deep Mantle
34.095° N, 136.464° E
GPS Coordinates
21 tons
TNT Equivalent Power
NEIC
USGS Real-time Feed
A magnitude 4.1 event is classified as a light earthquake. Noticeable shaking of indoor objects and rattling doors/windows. Generally causes none to slight non-structural damage in older buildings.
Felt by almost no one except under extraordinarily favorable conditions.
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Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Because seismic scales are logarithmic, each whole integer increase represents:
Japan sits at the complex collision intersection of four major tectonic plates: the Pacific, Philippine Sea, Eurasian, and North American plates. Subduction of the Pacific Plate beneath the Japanese archipelago creates intense strain that releases as high-frequency megathrust earthquakes and volcanic activity along the Pacific Ring of Fire.
Originating at a depth of 363.5 km (Deep Mantle Transition Zone (>300 km)), this rupture occurred generated deep within earth's mantle under immense hydrostatic pressure. surface shaking is significantly damped despite large energy release.
Seismologists note that minor aftershocks remain common in the 24 to 48 hours following tremors of magnitude 4.1. According to statistical seismic models, there is roughly a 5% probability of a subsequent event of equal or greater strength occurring in the same fault zone. Residents in Japan are advised to check living spaces for unsecured items.
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