A Seismic Study of Subducted Lithosphere

这项研究旨在利用现代波形反演技术来确定千岛-堪察加俯冲带过去25年来发生的所有200公里以上的大中型地震的震源参数和走时。所得数据将用于上地幔三维结构的反演和俯冲板块的应力方向研究。目标是解决板块是停在670公里边界处还是穿过下地幔的问题，这是一个影响地球动力学模型和地幔化学分层的重要问题。

This research is to use modern techniques of waveform inversion to determine both source parameters and travel times for all large to moderate-sized earthquakes that occurred deeper than 200 km in the Kuril-Kamchatka subduction zone in the past 25 years. The resultant data will be used to invert for 3-D structure in the upper mantle and to investigate the stress directions in the subducting slab. The goal is to address the question of whether the slab stops at the 670 km boundary or passes through into the lower mantle, a significant question affecting models of earth dynamics and the chemical layering of the mantle.