本文選題：賀蘭山西麓斷裂 + 構造地貌��； 參考：《中國地震局地殼應力研究所》2015年碩士論文

【摘要】：賀蘭山西麓斷裂位于南北帶最北端,阿拉善塊體與鄂爾多斯塊體的交界處。其中巴彥浩特斷裂是賀蘭山西麓斷裂最活動的一段,是一條右旋走滑兼有正傾滑的全新世活動斷裂。根據(jù)影像解譯及野外考察,斷裂線性地貌清晰,陡坎發(fā)育,最新活動中斷錯的沖溝、河流階地及洪積扇,為定量研究斷裂提供可靠依據(jù)。根據(jù)3個探槽揭示的事件對比分析,確定4次古地震事件,分別為1.65-5.52 Ka之間、5.5-8.8Ka之間、8.8-11.66Ka、11.OKa-21.51Ka。根據(jù)斷錯地貌及相關沉積物年齡,獲得斷裂全新世平均水平位移10.1m,平均水平滑動速率1.37±0.1mm/a；晚更新世晚期平均水平位移13.1m,平均水平滑動速率1.09±0.2mm/a,表明斷裂進入全新世活動有增強趨勢；晚更新世以來的垂直滑動速率為0.64mm/a；而通過陡坎形變法確定斷層的滑動速率為0.7mm/a。利用時間可預測模型和地震矩率釋放法分別得到地震復發(fā)周期為3420a和3190a。此外通過階地橫剖面和年代數(shù)據(jù)確定斷層上盤河流的下切侵蝕速率為0.27mm/a,此速率小于斷層上盤的抬升速率。
[Abstract]:The west foot fault of Helan Mountain is located at the northern end of the north and south belt and the junction of Alashan block and Ordos block. The Bayanhaote fault is the most active fault in the western foothills of Helan Mountain, and it is a Holocene active fault with a right-lateral strike-slip and a positive dip slip. According to the image interpretation and field investigation, the linear geomorphology of the fault is clear, the steep ridges are developed, the gullies, river terraces and alluvial fans with the latest activity interruptions are developed, which provides a reliable basis for the quantitative study of faults. According to the comparison and analysis of the events revealed by the three channels, four paleoearthquakes are determined, which are between 1.65-5.52 Ka and 5.5-8.8 Ka, 8.8-11.66 Ka and 11.OKa-21.51 Ka. respectively. According to fault geomorphology and related sediment age, the average horizontal displacement of Holocene is 10.1 m, the average horizontal slip rate is 1.37 鹵0.1 mm / a, the average horizontal displacement of late Pleistocene is 13.1 m, and the average horizontal sliding rate is 1.09 鹵0.2 mm / a, which indicates that the activity of fault entering Holocene is increasing. The vertical slip rate since the late Pleistocene is 0.64 mm / a, while the fault slip rate is 0.7mm / a determined by the steep-ridge deformation. The recurrence periods are 3420a and 3190a, respectively, using the time-predictable model and the seismic moment rate release method. In addition, it is determined by terrace cross section and age data that the down-cut erosion rate of the upper face of the fault is 0.27 mm / a, which is less than the uplift rate of the upper face of the fault.
【學位授予單位】：中國地震局地殼應力研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315.2

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