吉林—日本区深震特征及板块俯冲图像分析  

Analysis of the focal depth characters and the images of plate subduction in Jilin-Japan zone

作　　者：方炜[1] 刘春[1] 张春生[1] 邵辉成[1] 

机构地区：[1]陕西省地震局,陕西西安710068

出　　处：《华南地震》2004年第1期18-22,共5页South China Journal of Seismology

摘　　要：根据USGS地震资料:分析了吉林—日本深震区地震的深度特征,结果表明:吉林—日本深震区地震位于太平洋板块与欧亚大陆板块的交界带上,其北支地震活动强于南支,同时也揭示了该区地震深度、地震频次以及地震能量之间的关系,指出其最容易发生强震的地震层位在570～580km左右。由深度资料推断板块间的作用方式,太平洋板块向欧亚大陆的挤压是一个由浅入深的过程,在不同的部位其俯冲角度与俯冲距离是不一样的,一般来说,倾角越大,俯冲越陡,水平延伸距离越短;反之,倾角越小,俯冲越平缓,水平延伸距离越长。According to the USGS earthquake data, we analyzed the depth characters of the earthquakes occurring in Jilin—Japan zone. The result showed that the earthquakes in Jilin—Japan were along the junction of the Pacific Plate and the Eurasia Plate, and the North Branch earthquakes were stronger than the South. At the same time, the relations of the earthquake depth, frequency and energy were opened out. It was indicated that strong earthquakes occur most easilyatthestratums from 570 km to 580 km. By depth data deducing the ways of action between the plates, the Pacific Plate pushing the Eurasia plate is a process from shallow to deep, but there are different subduction angles and distances in different regions. Generally speaking, the bigger angle of dip and the more precipitous subduction, the shorter horizontally stretching distance. Contrarily, the smaller angle of dip and the gentler subduction, the longer horizontally stretching distance.

关 键 词：异常特征 地震深度 地震活动 板块俯冲 

分 类 号：P315.72[天文地球—地震学]