Attenuation tomography using large-scale seafloor and land network data in northeast Japan.

ABSTRACT: Existence of a heterogeneous attenuation structure in northeast Japan has long been documented. Despite this, attenuation structure around the plate boundary in the offshore region could not be examined thoroughly owing to a lack of data. After the 2011 Mw 9.1 Tohoku-oki earthquake, a seafloor network of 150 observatories, known as S-net, was established spanning the entire Japan Trench subduction zone to reinforce infrastructure for earthquake and tsunami early warnings. In the present research, we computed S-wave Fourier spectra of accelerograms from the seafloor and land stations and applied the principle of seismic tomography to retrieve three-dimensional attenuation structure (Qs). Our results showed a prominent low-to-moderate Qs zone near the upper surface of the oceanic plate in th

SUBMITTER: Dhakal YP 

PROVIDER: S-EPMC12568934 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature