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  梁宽,马保起,田勤俭,刘韶.色尔腾山山前断裂东段与西段转折处构造演化特征[J].震灾防御技术,2019,14(3):600-616, DOI:10.11899/zzfy20190313.

色尔腾山山前断裂东段与西段转折处构造演化特征
摘要:    色尔腾山山前断裂位于鄂尔多斯块体西北角,控制着临河凹陷(河套盆地西部)的持续沉降。对色尔腾山山前断裂东段与西段转折处构造演化模式的研究,有助于提高对正断层演化规律和区域地震风险的认识。本文在研究区大比例尺活动断裂填图的基础上,通过对重点区域进行无人机微地貌的测量、探槽开挖、钻孔资料与第四纪测年等方法获取数据,并运用构造地质学、地貌学和沉积地层学等理论,综合探讨断层转折处的构造演化模式及地震危险性。通过研究认为,近东西走向的色尔腾山山前断裂西段与北西走向的东段间以三角状的转换斜坡相连。现今的转折点为应力的积累区,具有较高的地震风险。水平拉伸力的持续作用使断层不断向盆地一侧迁移,同时使断裂转折部位更加平滑。
作者单位
梁宽 中国地震局地质研究所, 北京 100029
中国地震局地壳应力研究所, 北京 100085 
马保起 中国地震局地壳应力研究所, 北京 100085 
田勤俭 中国地震局地震预测研究所, 北京 100036 
刘韶 四川省地震局, 成都 610041 
关  键  词:河套盆地  色尔腾山山前断裂  正断层转折点  多级地貌面  转换斜坡
DOI:10.11899/zzfy20190313
基金项目:中国地震局项目“色尔腾山山前断裂1:5万活动断层填图”(201408023)
收稿日期:2019-02-08
作者简介:梁宽,男,生于1988年。博士研究生。主要从事活动构造方面的研究。E-mail:liangkuan18@126.com
通讯作者:马保起,男,生于1965年。研究员。主要从事地震地质、第四纪地质和活断层方面研究。E-mail:mbq98@163.com
Tectonic Evolution of the Turning Point of the Eastern and Western Section of the Seertengshan Piedmont Fault
Abstract:      The Seertengshan Piedmont Fault (SPF) is located in the northwest corner of Ordos block, which controls the continuous settlement of the Linhe sag (western Hetao basin). The study of the tectonic evolution of the turning point between eastern and western segment of the SPF will help to improve our understanding of the normal fault evolution law and regional seismic risk. Based on the large-scale active fault mapping in the study area, we conduct the field survey of UAV micro-geomorphology in key areas, and combine trench excavation and Quaternary dating methods to explore the tectonic evolution patterns and earthquake hazard at fault turning point comprehensively. Through this study, we find that the EW-trending western segment of SPF and NW-trending eastern segment of SPF are connected by a triangular relay ramp. The turning point is the accumulation area of stress and has a high earthquake risk at present. With the continuous action of the horizontal tensile force, the normal faults migrate to the basin, and "cutting and straightening" makes the geometry of turning part smooth.
Keywords:  Hetao basin  Seertengshan Piedmont Fault  Normal fault turning point  Stepped multi-level landform  Relay ramp
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