11:30 AM - 11:45 AM
[SCG61-22] Structural characteristics of the subducting Kyushu-Palau ridge around the Hyuga-nada region in Nankai Trough revealed by seismic reflection imaging
Japan Agency for Marine-Earth Science and Technology carried out a dense high-resolution seismic reflection survey over 600 km of line length around the northern end of KPR from Sep. to Oct. 2016 using R/V Yokosuka.
Beneath the accretionary prism where VLFEs are active, we observed the convex structure corresponding to the subducting Kyushu Palau Ridge. The distribution of trench-fill sediments is limited to only the east side of KPR. It is difficult to trace the frontal thrust close to KPR. There is no deformation structure in the trench-fill sediments from the trench axis to the seaward region around KPR. Our results suggest that subducting KPR contributes to the deformation process around the trench axis.
This study is part of "Research project for compound disaster mitigation on the great earthquakes and tsunamis around the Nankai Trough region" funded by the Ministry of Education, Culture, Sports, Science, and Technology of Japan and JSPS KAKENHI Grant Number 16K17824.