摘要
郯城—庐江断裂带是纵贯中国大陆东部,长达2 000km以上的大断裂带。该研究利用DEM数据和ETM,以及谷歌卫星影像来分析郯城—庐江断裂带中段的沂沭断裂带周边的水系的几何分布形态特征。三维卫星图像解译和野外调查的结果显示:(1)沿断裂带周边发育的水系的几何分布形态主要受由F1—F44条主要断层所组成的沂沭断裂带构造所制约;(2)沿断裂带发育的水系不具有典型的走滑断层的系统化的同步转折和位错的变形特征;(3)沂沭断裂带东侧的F1和F2断裂是现今的活动断裂,而F3和F4断裂在第四纪基本没有明显的活动迹象;(4)F1和F2断裂以垂向运动为主,具有高角度的逆断层或正断层的运动特征。该研究结果显示沿断裂发育的水系地貌和几何分布特征可作为评价断裂的活动性和运动特征的地貌标志。
The Yishu Fault Zone,the central segment of the Tan Lu Fault Zone（TLFZ）,located in Shandong Peninsula,eastern China,is composed of four major faults,called F1 F4 from east to west,forming a 50-km-wide zone.In this study,we analyzed the distribution pattern of drainage systems developed along the Yishu Fault Zone mainly on the basis of the interpretations of Digital Elevation Model（DEM） data,Landsat Enhanced Thematic Mapper（ETM）,and Google imagery data and field investigations.Our results reveal that the streams and gullies are mainly restricted by the Yishu Fault Zone along the graben structures bounded by F1 F2 and F3 F4 faults,respectively,in the northern segment of the Yishu Fault Zone,and are constrained by F1 and F2 faults but not by F3 and F4 faults in the southern segment.Geologic and topographic evidence shows that the Yishu Fault Zone is characterized by the deformational features of normal-reverse faults with high dip angle of 70°-90° and that F1 and F2 faults are currently active but F3 and F4 faults are inactive in the Quaternary.Our results confirm that the topographic features of drainage systems are reliable indicators of ground deformation along the pre-existing fault structures and can be used for studying the activity and dynamic characteristics of active faults.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2013年第4期125-136,共12页
Earth Science Frontiers
基金
日本文部科学省科学研究项目(Science Project No.23253002)
中国地质调查局项目(1212011120099)
