阿尔金断裂带东段构造转换与小震活动关系研究

项目名称： 阿尔金断裂带东段构造转换与小震活动关系研究

项目编号： No.41502206

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 刘亢

作者单位： 中国地震应急搜救中心

项目金额： 21万元

中文摘要： 阿尔金断裂带东段与祁连山逆冲断裂带之间的构造转换及其动力学机制一直是地质学家关注的焦点。基于前人研究基础，本申请选取党河南山断裂带与野马河-大雪山断裂作为重点研究区域，依靠卫星影像解译结果，选择关键地点开展野外调查，利用地貌测量、探槽开挖等技术手段，由点及线，确定断裂带的活动特征及其构造转换特征，探讨逆冲断裂的扩展模式。对研究区内丰富的中小地震进行重新定位与精定位，刻画出断裂空间展布形态。拟计算3.0级以上地震的震源机制解，分析活动断裂现今运动特征，结合野外地质调查认识，从地质学与地震学的角度分析研究区走滑断裂与逆冲断裂的构造转换特征，通过深浅部构造分析，探索研究区断裂系统的构造样式及其构造转换的动力学机制。

中文关键词： 阿尔金断裂带；构造转换；动力学机制；小震活动；双差定位

英文摘要： The tectonic transformation and kinetic mechanism between the eastern segment of the Altyn Tagh fault zone and Qilian Mountains thrust belt have been the focus of attention of geologists. Based on the previous, this application will select the Yemahe-Daxueshan fault and the Danghenanshan fault as key study region. According to the interpreting of remote sensing image, the application will select key site for field surveys to determine faults activities and tectonic transformation. On the basis of detailed field geological survey, the application will study Holocene activities and investigate the expansion pattern of thrust fault. The study will acquire the accurate relocations of small earthquakes by double-difference location method to depict the fault geometry and structure and get the focal mechanism solution of earthquakes (Ms>3.0) to confirm the features of current dynamic and local stress field of the deep active fault. Combined with geological survey data, the application will build the tectonic transformation model from the angle of Geology and Seismology and probe the tectonic style and kinetic mechanism through the method of shallow and deep structures analyses.

英文关键词： the Altyn Fault Zone;tectonic transformation;kinetic mechanism;small earthquake activity;double-difference location