日本-千岛海沟转折处地震层析成像研究

摘要

根据P波走时地震数据,使用双差层析成像方法,获得较高分辨率的日本-千岛海沟转折处俯冲带200 km深度内的震源重定位及P波速度结构结果.将日本-千岛海沟转折处俯冲带分为北日本海沟俯冲带及南千岛海沟俯冲带,且200 km深度内太平洋俯冲板块是连续的.最后,结合水深地形数据、断裂特征资料,划分日本-千岛海沟转折处俯冲带的断裂级别.%Using the P-wave travel time of seismic data processed by the double difference tomography method,we obtain hypocenter relocation results and P-wave velocity structure within the range of 0～200 km beneath the Japan-Kuril trench subduction zone.This divides the Japan-Kuril trench subduction zone into the north of the Japan trench subduction zone and the south of the Kuril trench subduction zone.The Pacific plate is continuous within the depth of 200 km.Combining bathymetric with fracture feature data,we identify the fracture classification of the Japan-Kuril trench subduction zone.