Nature Publishing Group

A slab fragment wedged under Tokyo and its tectonic and seismic implications

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A three-dimensional evaluation of earthquake hypocentres beneath the Kanto basin in Japan reveals the presence of a distinct, 25-km-thick and 100-km-wide body. Its fast seismic velocity and the presence of a double seismic zone suggest that it is a fragment of the Pacific slab, rather than an extension of the Philippine Sea slab. This implies that the penetration of the Philippine Sea slab is much shallower beneath the Kanto basin than was previously thought.

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