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活动断层、地震灾害与减灾对策问题 总被引：19，自引：4，他引：15
本文在对活动断层的定义和相关概念的论述基础上,通过活动断层与地震灾害间空间分布上的相关性分析,以及海原断裂带松山和阿尔金断裂带阿克塞老城西等地点的探槽地质剖面的介纠等,揭示出活动断层近地表永久性地质变形的局部化特征,永久变形带宽度一般小于30m。文章最后介绍了美国加州地震断层划定法案的主要内容和活动断层填图计划作为积极有效减灾的一项公益性对策,指出中国大陆地区应有步骤地开展大比例尺活动断层填图来有效地减轻可能遭遇的地震灾害。 相似文献
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昆仑山地震(M_w7.8)破裂行为、变形局部化特征及其构造内涵讨论 总被引：4，自引：0，他引：4
《中国科学D辑》2008,(7)
地震地表破裂是地壳弹性应变转化为永久性构造变形的表现形式.2001年昆仑山地震在东昆仑断裂带库赛湖段产生的地表破裂带整体长426km,由西部剪切走滑破裂段、中部张剪切破裂段和东部剪切走滑破裂段等3个相对独立的地表破裂段组成,即昆仑山地震由震级为Mw=6.8,Mw=6.2和Mw≤7.8的3次地震破裂事件组成,其中东段Mw≤7.8级地震为昆仑山地震主震,由4次更次级地震事件组成.野外测量表明,不同段落上单条地表破裂宽度一般介于数米至15m,最大不超过30m;组合地表破裂带的宽度主要取决于几何结构,特别是次级地表破裂带斜列区的宽度,具有变形局部化的基本特征.结合东昆仑断裂带第四纪地质速率与GPS监测应变速率一致性,2001年昆仑山地震地表破裂局部化特征说明,青藏高原北部巴颜喀拉与祁连-柴达木两大块体间的构造变形主要表现为东昆仑断裂带宽度有限的剪切走滑错动,东昆仑山断裂带南北两侧块体具有整体运动特征.地震破裂局部化特征对确定重大工程、居民住宅和生命线工程等免遭走滑断层同震地表错动引起直接破坏的避让带宽度具有十分重要现实意义. 相似文献
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昆仑山地震（Mw7．8）破裂行为、变形局部化特征及其构造内涵讨论 总被引：1，自引：0，他引：1
地震地表破裂是地壳弹性应变转化为永久性构造变形的表现形式．2001年昆仑山地震在东昆仑断裂带库赛湖段产生的地表破裂带整体长426km,由西部剪切走滑破裂段、中部张剪切破裂段和东部剪切走滑破裂段等3个相对独立的地表破裂段组成,即昆仑山地震由震级为Mw=6．8,Mw=6．2和Mw≤7．8的3次地震破裂事件组成,其中东段Mw≤7．8级地震为昆仑山地震主震,由4次更次级地震事件组成．野外测量表明,不同段落上单条地表破裂宽度一般介于数米至15m,最大不超过30m;组合地表破裂带的宽度主要取决于几何结构,特别是次级地表破裂带斜列区的宽度,具有变形局部化的基本特征．结合东昆仑断裂带第四纪地质速率与GPS监测应变速率一致性,2001年昆仑山地震地表破裂局部化特征说明,青藏高原北部巴颜喀拉与祁连．柴达木两大块体间的构造变形主要表现为东昆仑断裂带宽度有限的剪切走滑错动,东昆仑山断裂带南北两侧块体具有整体运动特征．地震破裂局部化特征对确定重大工程、居民住宅和生命线工程等免遭走滑断层同震地表错动引起直接破坏的避让带宽度具有十分重要现实意义． 相似文献
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《地震地质》2016,(3)
阿尔金断裂带是青藏高原北边界的1条近EW向延伸长约1600km的大型左旋走滑断裂带,也是晚第四纪活动性最强的断裂带之一,被分为11个破裂段。利用高精度卫星影像结合野外地质地貌调查,通过Trimble VX扫描测量了阿尔金断裂带阿克塞段半果巴观察点的断错微地貌,显示冲沟左岸T1阶地保存了最新1次地震的位错约6~7m。选择冲沟右岸跨断塞塘开挖探槽,采集了14C样品进行年代测定,对该探槽的古地震事件进行了分析。探槽揭示了12套地层单元,记录了4次古地震事件,结合之前的研究,利用逐次限定方法可以把阿克塞段的最新2次古地震事件的发生时间分别限定在1 180a BP左右和507~230a BP。 相似文献
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正以往的古地震研究主要以单条断层或者某一断层段落为研究对象,研究它的复发和破裂规律。其中蕴含一个潜在假设:各个断层或断层段落之间相对独立。但是近年来越来越多的大地震研究结果表明,相邻的断层,各个断层段落以及同一块体的边界断层之间有着一定的相关性。一些学者研究单条走滑断层的破裂行为,如在海原断裂带上,多个地点探槽开挖以及历史地震资料通过逐次限定方法,揭示出海原断裂带3个段落地震破裂行为具有一定的响 相似文献
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在海原断裂带内部发现一个第三纪拉分盆地 ,命名为老龙湾拉分盆地。根据卫片解译结果和野外地质调查 ,对该盆地内的地层沉积序列、地层分布、相关断裂等特征进行了研究。结果表明 ,老龙湾拉分盆地发育于海原断裂内的最大斜列部位 ,盆地沉积受边界断裂控制 ;盆地内部沉积了巨砾岩、杂砾岩及紫红色 -灰绿色泥岩、桔红色角砾岩等地层 ,最大沉积厚度约 4 6 0 0m。老龙湾盆地内部地层不整合于不同的外围地层之上 ,根据对盆地内部沉积序列及外围第三系的区域对比 ,认为盆地沉积开始于中新世中期。由以上特征确定老龙湾盆地为海原断裂带内的第三纪拉分盆地。它为青藏高原东北缘第三纪的走滑断层活动的研究提供了地质证据 相似文献
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《地震地质》2016,(4)
沿大型走滑断裂带经常发生导致多个断层段同时破裂的级联破裂地震事件。海原断裂带在1920年海原M 8地震时3个段同时发生破裂,干盐池拉分盆地即为其西段和中段的分段边界。沿该盆地内新生断层的古地震研究揭示了晚更新世末期以来的至少7次古地震事件证据,最新1次事件为1920年海原地震,1920年海原地震之前的1次事件可能与1092年历史地震对应。对比分析表明,这些事件可能均为超过8级的大地震,其复发呈现地震丛集与单个事件相间排列的规律,当前可能处于最近的1个地震丛集期内。该古地震序列与整个海原断裂带的大地震活动历史的对比表明,干盐池拉分盆地内新生断层在级联破裂地震事件发生时并非总是同时破裂,该断层是否参与破裂可能与该次级联破裂事件的震级大小有关。讨论整个走滑断裂带大地震活动历史时应避免仅依据具有一定规模的拉分盆地内部断层的破裂记录。 相似文献
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拉分盆地内部的"对角线式中央断层",不仅在拉分盆地的消亡过程中发挥着重要作用,还对大地震的发生具有重要控制作用,研究其形成演化具有重要的意义。然而,与拉分盆地相比,专门针对中央断层的研究较少,制约了人们对拉分盆地乃至走滑断裂带构造演化过程的理解。文中以海原断裂带中段的干盐池拉分盆地为例,对盆地内的中央断层开展了地质地貌调查、浅层人工地震勘探和钻孔联合探测等工作,着重对该断层的性质和形成机制进行了探讨,获得的主要认识有:1)与前人的认识不同,干盐池盆地中央断层为一条倾向SW的逆走滑断层;2)干盐池盆地为一不对称拉分盆地,其形成演化主要受盆地北缘的南-西华山北麓断层控制,盆地内堆积了厚度> 680m的生长地层且构成了翻转背斜;3)干盐池拉分盆地的实例表明,逆走滑中央断层的形成机制可能是"截弯取直"作用,即初期发育的反向正断层在截弯取直后吸收了边界断层的逆走滑位移而形成,而翻转背斜可能对中央断层的倾向发生旋转有一定影响。 相似文献
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下热尔断裂位于巴颜喀拉块体东北边界变形带即东昆仑断裂带东段与迭部-白龙江断裂2条剪切断裂之间挤压变形带内,在空间上属于“玛曲空段”范围.经野外考察及遥感资料验证,确定下热尔断裂走向为310°,长度约为20km,运动学特征表现为左旋走滑为主兼少量倾滑分量,沿断裂发育大量断错地貌,水平位移主要分布在3.5～5m,而未发现垂向断错地貌;垂直断裂走向开挖2处探槽,揭示断层切穿晚第四纪地层,被地表沼泽相泥炭层覆盖,结合相关地层年龄资料,初步得出平均水平滑动速率约为6.3mm/a.该断裂在几何学与运动学方面与东昆仑断裂带具有较好的一致性,推测两者之间存在一定相关性,属于东昆仑断裂带走滑断裂体系内的一条次级断裂或过渡性断裂. 相似文献
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A PRELIMINARY RESEARCH ON THE RIGHT-LATERAL STRIKE-SLIP CHARACTERISTICS AND THE STRUCTURAL SIGNIFICANCE OF THE NORTHERN KUANTANSHAN FAULTS,HEXI CORRIDER,BASED ON HIGH-RESOLUTION IMAGERY 
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下载免费PDF全文 The sinistral strike-slip characteristic of the Altyn Tagh Fault gradually disappears near the Jiuxi Basin at the west end of Hexi Corridor, and the Kuantanshan Fault and the northern marginal fault of Heishan on its east are thrust structures. There are two faults distributed in the north of Kuantanshan, namely, the Taerwan-Chijiaciwo Fault and the Ganxiashan Fault, both are featured with obvious activity. Predecessors thought that the Taerwan-Chijiaciwo Fault is a thrust fault with low movement rate, but there is few detailed study on its horizontal motion. Is there horizontal strike-slip movement in the northern marginal fault of Kuantanshan? This issue has an important significance to further explore the structural transformation mode between the Altyn Tagh strike-slip faults and the northern thrust faults in the north margin of Qilianshan. Using high resolution remote sensing images and field work, such as combining with UAV SfM photogrammetry, the paper studies the strike-slip characteristics of the Taerwan-Chijiaciwo Fault and Ganxiashan Fault on the northern margin of Kuantanshan, and get two preliminary understandings:(1) The northern marginal fault of Kuantanshan is an active right-lateral strike-slip fault with thrust component, the horizontal to vertical dislocation ratio is about 3-4 times. Based on the statistics of dislocation amount of the gullies and terraces along the north marginal Kuantanshan fault, it is preliminarily estimated that the late Pleistocene right-lateral strike-slip rate is about 0.2-0.25 mm/a and the Holocene right-lateral strike-slip rate is about 0.5-1.5 mm/a. (2) The main driving force to the tectonics at the western end of Hexi Corridor, where the northern marginal fault of Kuantanshan locates, comes from the northward extrusion of the Qilian Mountains, which results in the right-lateral strike-slip of the northern marginal fault of Kuananshan and the thrust movement of several faults inside the Jiuxi Basin. The effect of the Altyn Tagh Fault on other tectonic structures is not obvious in this region. 相似文献
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通过讨论层状断层的性质、特点以及与正断层、逆断层和走滑断层的相互关系,探讨了大陆板内地震的发震机制,指出许多地震的震源位于层状断层面上,有些地震在地表找不到相应的地震构造的原因是由层间滑动所引起。 相似文献
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The Ximalin fault is the northwest section of the Ximalin-Shuiquan fault, which is part of the north-edge fault zone of the Yanghe Basin, located in the conjunction of the Zhangjiakou-Bohai fault zone and Shanxi fault-depression basin, and its structural geometry and deformation characteristics can facilitate the research on the interaction of the two tectonic belts. In this paper, data of geological surveys and geophysical exploration are used to study this fault exhaustively, concerning its geometry, structural features and activity as well as its relationship with adjacent faults and rule in the deformation transform of the north-edge fault zone of the Yanghe Basin. The results show that the Ximalin Fault is a strike-slip feature with thrust component. Its vertical slip rates are 0.17mm/a and 0.25~0.38mm/a, and the horizontal slip rate is 0.58~0.67mm/a and 0.50mm/a during the late Middle Pleistocene and Holocene, respectively. It is formed alternately by the NW-trending main faults and secondary NE-trending faults, of which the former is characterized by high-angle reverse with sinistral strike-slip, and the latter shows normal faulting. The two sets of structures have specific structural geometry relations, and the motion manners and deformation characteristics match each other. During the active process of the north-edge fault of the Yanghe Basin, the NW trending Ximalin fault played a role similar to a transform fault in deformation change and stress transfer, and its sinistral strike slip activity accommodated the NE trending normal faulting at the both ends. 相似文献
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The Riyue Mt. Fault is a secondary fault controlled by the major regional boundary faults (East Kunlun Fault and Qilian-Haiyuan Fault). It lies in the interior of Qaidam-Qilianshan block and between the major regional boundary faults. The Riyue Mt. fault zone locates in the special tectonic setting which can provide some evidences for recent activity of outward extension of NE Tibetan plateau, so it is of significance to determine the activity of Riyue Mt. Fault since late Pleistocene to Holocene. In this paper, we have obtained some findings along the Dezhou segment of Riyue Mt. Fault by interpreting the piedmont alluvial fans, measuring fault scarps, and excavating trenches across the fault scarp. The findings are as follows:(1) Since the late Pleistocene, there are an alluvial fan fp and three river terraces T1-T3 formed on the Dezhou segment. The abandonment age of fp is approximately (21.2±0.6) ka, and that of the river terrace T2 is (12.4±0.11) ka. (2) Since the late Pleistocene, the dextral strike-slip rate of the Riyue Mt. Fault is (2.41±0.25) mm/a. In the Holocene, the dextral strike-slip rate of the fault is (2.18±0.40) mm/a, and its vertical displacement rate is (0.24±0.16) mm/a. This result indicates that the dextral strike-slip rate of the Riyue Mt. Fault has not changed since the late Pleistocene. It is believed that, as one of the dextral strikeslip faults, sandwiched between the the regional big left-lateral strike-slip faults, the Riyue Mt. Fault didn't cut the boundary zone of the large block. What's more, the dextral strike-slip faults play an important role in the coordination of deformation between the sub-blocks during the long term growth and expansion of the northeast Tibetan plateau. 相似文献
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ANALYSIS OF EVOLUTION OF THE RIYUESHAN FAULT SINCE LATE PLEISTOCENE USING STRUCTURAL GEOMORPHOLOGY 下载免费PDF全文
下载免费PDF全文 The northeastern margin of Tibetan plateau is an active block controlled by the eastern Kunlun fault zone, the Qilian Shan-Haiyuan fault zone, and the Altyn Tagh fault zone. It is the frontier and the sensitive area of neotectonic activity since the Cenozoic. There are widespread folds, thrust faults and stike-slip faults in the northeastern Tibetan plateau produced by the intensive tectonic deformation, indicating that this area is suffering the crustal shortening, left-lateral shear and vertical uplift. The Riyueshan Fault is one of the major faults in the dextral strike-slip faults systems, which lies between the two major large-scale left-lateral strike-slip faults, the Qilian-Haiyuan Fault and the eastern Kunlun Fault. In the process of growing and expanding of the entire Tibetan plateau, the dextral strike-slip faults play an important role in regulating the deformation and transformation between the secondary blocks. In the early Quaternary, because of the northeastward expansion of the northeastern Tibetan plateau, tectonic deformations such as NE-direction extrusion shortening, clockwise rotation, and SEE-direction extrusion occurred in the northeastern margin of the Tibetan plateau, which lead to the left-lateral slip movement of the NWW-trending major regional boundary faults. As the result, the NNW-trending faults which lie between these NWW direction faults are developed. The main geomorphic units developed within the research area are controlled by the Riyueshan Fault, formed due to the northeastward motion of the Tibet block. These geomorphic units could be classified as:Qinghai Lake Basin, Haiyan Basin, Datonghe Basin, Dezhou Basin, and the mountains developed between the basins such as the Datongshan and the Riyueshan. Paleo basins, alluvial fans, multiple levels of terraces are developed at mountain fronts. The climate variation caused the formation of the geomorphic units during the expansion period of the lakes within the northeastern Tibetan plateau. There are two levels of alluvial fans and three levels of fluvial terrace developed in the study area, the sediments of the alluvial fans and fluvial terraces formed by different sources are developed in the same period. The Riyueshan Fault connects with the NNW-trending left-lateral strike-slip north marginal Tuoleshan fault in the north, and obliquely connects with the Lajishan thrust fault in the south. The fault extends for about 180km from north to south, passing through Datonghe, Reshui coal mine, Chaka River, Tuole, Ketu and Xicha, and connecting with the Lajishan thrusts near the Kesuer Basin. The Riyueshan Fault consists of five discontinuous right-step en-echelon sub-fault segments, with a spacing of 2~3km, and pull-apart basins are formed in the stepovers.
The Riyueshan Fault is a secondary fault located in the Qaidam-Qilian active block which is controlled by the major boundary faults, such as the East Kunlun Fault and the Qilian-Haiyuan Fault. Its activity characteristics provide information of the outward expansion of the northeastern margin of Tibet. Tectonic landforms are developed along the Riyueshan Fault. Focusing on the distinct geomorphic deformation since late Pleistocene, the paper obtains the vertical displacement along the fault strike by RTK measurement method. Based on the fault growth-linkage theory, the evolution of the Riyueshan Fault and the related kinetic background are discussed. The following three conclusions are obtained:1)According to the characteristics of development of the three-stage 200km-long steep fault scarp developed in the landforms of the late Pleistocene alluvial fans and terraces, the Riyueshan Fault is divided into five segments, with the most important segment located in the third stepover(CD-3); 2)The three-stage displacement distribution pattern of the Riyueshan Fault reveals that the fault was formed by the growths and connections of multiple secondary faults and is in the second stage of fault growth and connection. With CD-3 as the boundary, the faults on the NW side continue to grow and connect; the fault activity time on the SE side is shorter, and the activity intensity is weaker; 3)The extreme value of the fault displacement distribution curve indicates the location of strain concentration and stress accumulation. With the stepover CD-3 as the boundary, the stress and strain on NW side are mainly concentrated in the middle and fault stepovers. The long-term accumulation range of stress on the SE side is relatively dispersed. The stress state may be related to the counterclockwise rotation inside the block under the compression of regional tectonic stress. 相似文献
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THE PALEOSEISMIC SURFACE RUPTURE AT SOUTH OF CENTRAL ALTYN TAGH FAULT AND ITS TECTONIC IMPLICATION 下载免费PDF全文
下载免费PDF全文 SHAO Yan-xiu YUAN Dao-yang LIU-ZENG Jing Jerome Van der Woerd LI Zhi-gang WU Lei LIU Fang-bin 《地震地质》1979,42(2):435-454
In this study, we described a 14km-long paleoearthquakes surface rupture across the salt flats of western Qaidam Basin, 10km south of the Xorkol segment of the central Altyn Tagh Fault, with satellite images interpretation and field investigation methods. The surface rupture strikes on average about N80°E sub-parallel to the main Altyn Tagh Fault, but is composed of several stepping segments with markedly different strike ranging from 68°N~87°E. The surface rupture is marked by pressure ridges, sub-fault strands, tension-gashes, pull-apart and faulted basins, likely caused by left-lateral strike-slip faulting. More than 30 pressure ridges can be distinguished with various rectangular, elliptical or elongated shapes. Most long axis of the ridges are oblique(90°N~140°E)to, but a few are nearly parallel to the surface rupture strike. The ridge sizes vary also, with heights from 1 to 15m, widths from several to 60m, and lengths from 10 to 100m. The overall size of these pressure ridges is similar to those found along the Altyn Tagh Fault, for instance, south of Pingding Shan or across Xorkol. Right-stepping 0.5~1m-deep gashes or sub-faults, with lengths from a few meters to several hundred meters, are distributed obliquely between ridges at an angle reaching 30°. The sub-faults are characterized with SE or NW facing 0.5~1m-high scarps. Several pull-apart and faulted basins are bounded by faults along the eastern part of the surface rupture. One large pull-apart basins are 6~7m deep and 400m wide. A faulted basin, 80m wide, 500m long and 3m deep, is bounded by 2 left-stepping left-lateral faults and 4 right-stepping normal faults. Two to three m-wide gashes are often seen on pressure ridges, and some ridges are left-laterally faulted and cut into several parts, probably owing to the occurrence of repetitive earthquakes. The OSL dating indicates that the most recent rupture might occur during Holocene.
Southwestwards the rupture trace disappears a few hundred meters north of a south dipping thrust scarp bounding uplifted and folded Plio-Quaternary sediments to the south. Thrust scarps can be followed southwestward for another 12km and suggest a connection with the south Pingding Shan Fault, a left-lateral splay of the main Altyn Tagh Fault. To the northeast the rupture trace progressively veers to the east and is seen cross-cutting the bajada south of Datonggou Nanshan and merging with active thrusts clearly outlined by south facing cumulative scarps across the fans. The geometry of this strike-slip fault trace and the clear young seismic geomorphology typifies the present and tectonically active link between left-lateral strike-slip faulting and thrusting along the eastern termination of the Altyn Tagh Fault, a process responsible for the growth of the Tibetan plateau at its northeastern margin. The discrete relation between thrusting and strike-slip faulting suggests discontinuous transfer of strain from strike-slip faulting to thrusting and thus stepwise northeastward slip-rate decrease along the Altyn Tagh Fault after each strike-slip/thrust junction. 相似文献
Southwestwards the rupture trace disappears a few hundred meters north of a south dipping thrust scarp bounding uplifted and folded Plio-Quaternary sediments to the south. Thrust scarps can be followed southwestward for another 12km and suggest a connection with the south Pingding Shan Fault, a left-lateral splay of the main Altyn Tagh Fault. To the northeast the rupture trace progressively veers to the east and is seen cross-cutting the bajada south of Datonggou Nanshan and merging with active thrusts clearly outlined by south facing cumulative scarps across the fans. The geometry of this strike-slip fault trace and the clear young seismic geomorphology typifies the present and tectonically active link between left-lateral strike-slip faulting and thrusting along the eastern termination of the Altyn Tagh Fault, a process responsible for the growth of the Tibetan plateau at its northeastern margin. The discrete relation between thrusting and strike-slip faulting suggests discontinuous transfer of strain from strike-slip faulting to thrusting and thus stepwise northeastward slip-rate decrease along the Altyn Tagh Fault after each strike-slip/thrust junction. 相似文献
18.
小江断裂带中段东西支断裂间存在的ＮＥ向断裂是在第三纪ＮＥ向断裂的基础上，于第四纪中晚期开始新的活动，并具有左旋走滑运动的特征，有些在全新世仍有活动。它们的活动从属于小江断裂带的整体左旋走滑运动，其运动幅度和速率比近ＳＮ向小江东西支断裂小得多，但是由于它们的运动，使主断裂产生弯曲或阶区，形成有利于应力和应变集中的障碍。夹于东西支断裂之间的断块被ＮＥ向断裂切割为多个次级菱形和梭形断块，这些断块之间的相对运动对断裂分段和地震孕育过程具有不可忽视的影响 相似文献
19.
Franois Jouanne Franck A. Audemard Christian Beck Aurlien Van Welden Reinaldo Ollarves Carlos Reinoza 《Journal of Geodynamics》2011,51(5):398-410
The right-lateral strike-slip El Pilar Fault is one of the major structures that accommodate the relative displacement between the Caribbean and South-America Plates. This fault, which trends East–West along the northeastern Venezuela margin, is a seismogenic source, and shows numerous evidence for active tectonics, including deformation of the Quaternary sediments filling the Cariaco Gulf. Because the main El Pilar Fault strand belongs to a set of strike-slip faults and thrusts between the stable Guyana shield (South) and the Caribbean oceanic floor (North), a GPS network was designed and installed to measure the relative motion of the El Pilar Fault and other faults. The results obtained from the comparison of 2003 and 2005 surveys indicate: (i) a lack of significant displacement (especially shortening) in the Serrania del Interior (Neogene cordillera overthrusted above the Guyana craton), (ii) an eastward displacement (relative to fixed south America plate) up to 22 mm/year of benchmarks located north of the El Pilar Fault. 相似文献
20.
HOLOCENE SLIP RATE ALONG THE NE-TRENDING QIXIANG CO FAULT IN THE CENTRAL TIBETAN PLATEAU AND ITS TECTONIC IMPLICATIONS 下载免费PDF全文
下载免费PDF全文 The two mainstream deformation models of the Tibet plateau are continental escape model and crustal thickening model, the former suggests that the NW-trending Karakoram Fault, Gyaring Co Fault, Beng Co Fault and the Jiali Fault as the Karakoram-Jiali fault zone is the southern border belt and that the dextral strike-slip rate is estimated as up to 10~20mm/yr. However, research results in recent years show that the slip rates along those faults are significantly less than earlier estimates. Taylor et al. (2003)suggest that the conjugate strike-slip faults control the active deformation in the central Tibet.
The lack of research on the slip behavior of the NE-trending faults in the central Tibet Plateau constrains our understanding of the central Tibet deformation model. Thus, we choose the NE-direction Qixiang Co Fault located at the north of the Gyaring Co Fault as research object. Based on the interpretation of satellite images, we found several faulted geomorphic sites. Using RTK-GPS ground control point and unmanned aerial vehicle (UAV)topographic surveying, we obtained less than 10cm/pix-resolution digital elevation model (DEM)in the Yaqu town site. We used the LaDiCaoz_v2.1 software to automatically extract the left-lateral offset of the largest gully on the terrace T2 surface, which is (21.3±7.1)m, and the vertical dislocation of the scarp on the terrace T2 surface, which is (0.9±0.1)m. The age of both U-series dating samples on the terrace T2 is (4.98±0.17)ka and (5.98±0.07)ka, respectively. The Holocene left-lateral slip rate along Qixiang Co Fault is (3.56±1.19)mm/a and the vertical slip rate is (0.15±0.02)mm/a. The kinematic characteristics of the sinistral strike-slip with normal slip coincide with the eastward motion of the central Tibet plateau, and its magnitude is in agreement with its conjugate Gyaring Co Fault, suggesting that the deformation pattern of the central Tibetan plateau complies with the conjugate strike-slip faults mode. 相似文献