基于小震定位与震源机制解信息的阿尔金断裂带东段构造转换研究
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摘要
阿尔金断裂带东段地区的造转换及其动力学机制研究一直是地学工作者关注的焦点.本文利用双差定位法获取研究区域2008—2017年间6013次地震事件的精确定位数据;整理筛选前人震源机制解36个,并采用P/S波振幅比方法计算获得221个以及CAP方法获得25个震源机制解信息.选择野马河—大雪山断裂作为研究区构造转换研究的突破口,综合小震定位数据与震源机制解信息,并开展野外地质调查进行验证,清晰刻画出该断裂的深部构造形态以及现今的运动特征:由阿尔金断裂带向祁连山方向过渡,断层产状由近直立逐渐转变为倾向南,倾角变缓,震源机制解由走滑性质为主转变为逆冲性质为主,是一个连续渐变的过程,为研究区的构造转换研究提供了直接证据.
The tectonic transformation and kinetic mechanism of the eastern Altyn Tagh fault zone have been a focus issue of geologists. In this work, 6013 earthquakes from 2008 to 2017 in study region were relaocted using the double-difference location algorithm.Meanwhile, we selected 36 focal mechanism solutions from previous study, and determined 221 focal mechanism solutions by using the method of the maximum amplitude ratio between P and S waves, and 25 focal mechanism solutions by the Cut and Paste(CAP) method. The Yemahe-Daxueshan fault zone was selected as an example of the tectonic transformation in study region. Based on these data of small earthquake relocation and focal mechanism solutions, as well as field geological investigations, spatial distribution of the faults and the current movement characteristics of the study area were described in detail. Results suggest that from the Altyn Tagh fault zone to the Qilian mountains, the faults gradually change from nearly-vertical to southward dipping and the focal mechanism solutions also chang from strike slip to dominant thrust,experiencing a continuous transition, which provides direct evidence for the tectonic transformation research.
The tectonic transformation and kinetic mechanism of the eastern Altyn Tagh fault zone have been a focus issue of geologists. In this work, 6013 earthquakes from 2008 to 2017 in study region were relaocted using the double-difference location algorithm.Meanwhile, we selected 36 focal mechanism solutions from previous study, and determined 221 focal mechanism solutions by using the method of the maximum amplitude ratio between P and S waves, and 25 focal mechanism solutions by the Cut and Paste(CAP) method. The Yemahe-Daxueshan fault zone was selected as an example of the tectonic transformation in study region. Based on these data of small earthquake relocation and focal mechanism solutions, as well as field geological investigations, spatial distribution of the faults and the current movement characteristics of the study area were described in detail. Results suggest that from the Altyn Tagh fault zone to the Qilian mountains, the faults gradually change from nearly-vertical to southward dipping and the focal mechanism solutions also chang from strike slip to dominant thrust,experiencing a continuous transition, which provides direct evidence for the tectonic transformation research.
引文
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