武威盆地南缘断裂晚第四纪活动地表形迹与活动速率

发布时间：2018-03-22 20:29

本文选题：活动构造　切入点：武威盆地南缘断裂　出处：《地震地质》2017年02期 　论文类型：期刊论文

【摘要】：武威盆地南缘断裂位于河西走廊东端,是祁连山北缘逆断裂系的重要组成部分,是1927年古浪8级地震的发震断裂之一。基于遥感影像解译、野外地质观测和14C年代学数据等方法对武威盆地南缘断裂进行了详细的几何学调查和运动学定量。依据平面上几何展布的不连续性和走向的变化,该断裂可以分为5段:康宁桥段(F_1)、南营河段(F_2)、上古城村—张流沟段(F_3)、他家庄段(F_4)和严家庄段(F_5)。该断裂为晚更新世以来活动断裂,地表活动形迹长约60km,以逆冲为主,局部兼具左旋走滑分量,沿断层走向断错地貌发育。断裂全新世以来的垂直滑动速率(0.44±0.08)mm/a,南营河段(F_2)晚更新世以来左旋走滑速率(1.43±0.08)mm/a。
[Abstract]:The southern margin of Wuwei Basin is located at the eastern end of the Hexi Corridor. It is an important part of the inverse fault system in the northern margin of Qilian Mountains, and is one of the seismogenic faults of the 1927 Gulang earthquake with M = 8. Field geological observations and 14C geochronological data are used to investigate the faults in the southern margin of Wuwei Basin in detail and to quantify their kinematics, according to the discontinuity of geometric distribution on the plane and the change of strike. The fault can be divided into five sections: Kangning bridge section F1D, Nanying reach F2D, Shanggucheng village-Zhangliugou section F3H4) and Yanjiazhuang section F5SP. The fault is an active fault since the late Pleistocene, the surface activity of which is about 60 km long and is dominated by thrusting. The vertical slip rate since Holocene is 0.44 卤0.08mm / a, and that in Nanying reach is 1.43 卤0.08mm / a since late Pleistocene.
【作者单位】：北京大学地球与空间科学学院造山带与地壳演化重点实验室;中国地质大学海相储层演化与油气富集机理教育部重点实验室;
【基金】：国家公益性重大专项“中国地震活动断层探察:南北地震带北段”(201408023)资助
【分类号】：P315.2

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