中国南极长城站地区地震活动特征及其周边深部结构

项目名称： 中国南极长城站地区地震活动特征及其周边深部结构

项目编号： No.41274063

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 常利军

作者单位： 中国地震局地球物理研究所

项目金额： 80万元

中文摘要： 中国南极长城站地区及周边位于南极半岛北部，受到南极板块、斯科舌板块和南美板块的影响，构造复杂，存在着多种类型的板块边界（发散边界、会聚边界和转换边界），是开展地震学研究的理想场所。由于南极极端的气候条件，限制了地震观测的开展，对这一地区的地震活动特征和深部结构的了解仍然是初步的。本项目旨在通过南极长城站地震台（CCZ）的地震观测，收集高质量地震观测资料，开展相关研究。对发生在长城站地区的近震进行单台定位测量，分析布兰斯菲尔德海峡、南设得兰群岛和南设得兰海沟的地震活动特征，提供南设得兰海沟下俯冲作用是否停止的证据，同时尝试开展冰震分析。此外，我们还将利用CCZ台及其周边全球台网的3个地震台的资料，在对宽频带资料的接收函数、面波方法分析的基础上，结合上地幔各向异性以及其它地球物理和地质资料，分析长城站地区及周边地壳上地幔结构特征，并讨论该区域不同板块碰撞形变的动力学含义。

中文关键词： 南极长城站；地震活动特征；深部构造；各向异性；

英文摘要： China Antarctic Great Wall Station area and its surrounding is located on the northern part of the tectonically-complicated Antarctic Peninsula, which is affected by the action of the Antarctic plate, the Scotia plate and the South American plate. There are three types of plate boundaries (i.e. divergent boundary, convergent boundary and transform boundary) in the study area. Thus the study area is an ideal site to study on seismology. However, due to ultra-climate conditions, seismological observation and relevant seismological research in Antarctica is still preliminary. The objective of this project is to carry out the relevant seismological research by using the high-quality broadband seismic data collected from the Antarctic Great Wall Station Seismic Station (CCZ). We shall use the single-station event location method to locate local earthquakes occurred in the Great Wall Station area. The located results are used to analyze the seismic activity characteristics in the Bransfield Strait, the South Shetland Islands and the South Shetland Trench, and to give the evidence that whether the subduction beneath the South Shetland Trench is ceased or on-going. Meanwhile, we shall try to carry out the icequake analysis. In addition, we shall also collect the seismic data from three broadband stations of Global Seism

英文关键词： Antarctic Great Wall Station；seismic activity characteristics；deep structure；anisotropy；