云南新构造年代学特征及其与地震活动关系研究

云南是一个新构造运动复杂、地震活动强烈的地区。自有地震记载以来，该区区发生７－７．９级地震１６次，８级地震１次。通过对运动新构造运动特点分析该区新构造运动分区现象及年代差异明显，全新世断裂活动主要集中在新构造单元边界断裂和新构造运动 强烈地区的较大规模的断裂上，这些断裂大多是７级以上大震的发震构造。     

云南新构造运动年代学特征及其与地震活动关系研究

云南是一个新构造运动复杂，地震活动强烈的地区。自有地震记载以来，该区共发生７—７．９级地震１６次，８级地震１次。通过对云南新构造运动特点分析该区新构造运动分区现象及年代学差异明显，全新世断裂活动主要集中在新构造单元边界断裂和新构造运动强烈地区的较大规模的断裂上，这些断裂大多是７级以上大震的发震构造。     

广西新构造分区特征及其与地震的关系

通过分析广西新构造运动类型、性质、幅度、强度等差异,将广西新构造划分为5个区,9个亚区。研究表明,地震活动与新构造分区特征有一定关系。新构造分区与地震区带划分吻合较好。广西的地震主要发生在新构造差异运动较强的区域。     

晋获断裂带构造和地震活动特征

晋获断裂带是华北地震区中一个次级构造单元,也是地震活动中的一个地震活动亚带。从分析该带的构造特征和地震活动特点出发,分析该带的分段性,发现变形强度由北向南递减、构造层次由北向南抬高。结合历史地震活动和现今地震活动,得出该带北段是该地震亚带主要的地震活动场所。在此基础上,由震级一时间模型对未来北段的强震活动进行预测。     

大别山的新构造运动与地震活动

大别山地区是华北与华南两个不同构造变动区的重要分异带。大别山的新构造运动、断裂活动、地震活动均与华北区、华南区有较大的差异,所以它在中国东部的新构造研究中占有特殊的地位。     

澜沧江中段水利枢纽工程水库诱发地震的地震地质环境分析

主要从大地构造环境、地球物理场、新构造运动、构造应力场、主要活动断裂及地震活动性方面,论述了该区复杂的地震地质环境,结合目前对水库诱发地震的认识,认为构造因素是影响该区水库诱发地震活动的主要因素,水库诱发地震将主要发生在库区断层及其附近.     

临汾盆地新构造格局与地震活动

临汾盆地是山西断陷带新构造最复杂、地震活动最强的断陷盆地.本文在叙述了盆地发育史的基础上讨论了盆地的全部边界;并详述了盆地新地质构造单元的划分及其特点.着眼于盆地的整体,讨论了临汾盆地地震发生的新构造运动背景.     

甘肃东南地区构造活动与2013年岷县—漳县MS6.6级地震孕震机制

位于南北地震带中北段的甘东南地区,其构造变形和构造活动特征与青藏高原向北东方向的扩展密切相关,该地区复杂的构造几何形态主要受控于东昆仑断裂和西秦岭北缘断裂,区域新构造运动主要动力来源于青藏高原向北东的扩展.近年来,甘东南地区中强地震频发,本文主要通过对该地区构造活动特征、历史地震等资料的综合分析讨论,结合地球物理、地震学和野外调查等资料,认为青藏高原东北部东昆仑断裂的向北挤压和向东的运动是该地区构造应力集中的主要原因,也是该地区中强地震的主要孕震环境和机制,而西秦岭北缘断裂的走滑及向南北两侧逆冲“花状构造”是临潭—宕昌断裂带上中强地震频繁发生的一个重要动力因素.2013年7月22日发生在甘肃岷县—漳县的M_S6.6级地震正好位于临潭—宕昌断裂带中东段上,是该断裂分段不均匀活动的结果.     

宁波地区的地震与新构造运动

在分析论述了宁波地区的历史地震、地震活动性、新构造运动和断裂活动性等特征的基础上,对其地震构造环境作出了综合评价．以此评定了宁波地区的地震危险性,并作为对我国东部弱地震活动地区开展工程地震研究工作的实例．      

瑞昌地区地震构造条件分析

通过分析瑞昌地区区域地震构造背景、地壳结构、地球物理场及新构造运动特征,结合最新断裂构造考察研究成果,研究该地区主要断裂活动性,并探讨中强地震的活动特征及其发震构造,研究成果对于瑞昌地区未来强震危险性评估具有参考意义。     

Present-day Horizontal Mobility in the Serbian Part of the Pannonian Basin; Inferences from the Geometric Analysis of Deformations

In tectonically complex environments, such as the Pannonian Basin surrounded by the Alps–Dinarides and Carpathians orogens, monitoring of recent deformations represents very challenging matter. Efficient quantification of active continental deformations demands the use of a multidisciplinary approach, including neotectonic, seismotectonic and geodetic methods. The present-day tectonic mobility in the Pannonian Basin is predominantly controlled by the northward movement of the Adria micro-plate, which has produced compressional stresses that were party accommodated by the Alps-Dinarides thrust belt and partly transferred towards its hinterland. Influence of thus induced stresses on the recent strain field, deformations and tectonic mobility in the southern segment of the Pannonian Basin has been investigated using GPS measurements of the horizontal mobility in the Vojvodina area (northern Serbia).     

Experiment of Dividing the Active Blocks Based on Horizontal Crustal Movement Observed by GPS

In this paper, the discrepancy between the movements of intraplate blocks and plates isdiscussed, and the method to divide the intraplate active blocks is presented by selecting Bursaformula as the kinematic model for the intraplate blocks. Based on the data of three GPScampaigns in North-China network in l995, 1996 and l999, respectively, the northern area inNorth China is divided into eight small blocks with the mathematical model and methodpresented in this paper. The divided blocks based on tbe horizontal and vertical crustalmovements in the paper are consistent or approximate with each other in the area as a whole.The divided blocks in the paper is also basically accordant with the neotectonic movement,which indicates that the current movement of active blocks in this area is the succession anddevelopment of neotectonic movement. Moreover, some new activity characteristics in the areahave been revealed by the tectonic units divided with the horizontal crustal movement.     

山西及邻区水系与黄土冲沟的分形几何学分析结果及其与构造活动的关系

本文用分形几何理论,对山西及邻区水系与黄土冲沟作了分析,发现水系与冲沟分维值的大小反映了该区构造活动性的强弱,分维值的分布定量地反映了区域构造活动的背景及各区域构造活动性的差异,在构造活动强的区域,分维值高,反之则低。按分维值的大小山西断陷带分成南中北三段,以中段介休-临汾一带的分维值及反映的构造活动性最强。该区分维值的分布及反映的构造活动性有从四周向中间增强的特点,增强区与强震的发生有关     

珠江三角洲地区新构造运动年代学的研究

本文发表珠江三角洲地区14个不同时代的地貌体的年代数据,并据此初步探讨三角洲地区晚第四纪以来新构造运动的时间、空间序列以及运动的幅度和速率     

张家口断裂第四纪构造变形与活动性研究

本文根据野外详实资料对张家口断裂的构造变形和活动性进行分析与研究,结果表明:断裂由西、中、东3段组成,各段多由北西向和近东西向2组多条次级断层组成,总体呈北西西走向展布,长达70km,控制着张家口及附近的第四纪构造演化和地貌发育;北西向断层构成断裂的主体,为高角度的逆(或正)走滑断层,近东西向断层较短,表现为正倾滑,第四纪期间2组断层持续活动,以脆性变形为特征;断裂端部段落与北东向断裂交汇,活动性较弱,构造表现不甚清楚,中部段落活动强烈,晚更新世以来单条断层的平均垂直活动速率大于0.07—0.30mm/a,总的垂直活动速率可能达到1.33mm/a。     

新疆阜康-吉木萨尔断裂带的几何特征与活动性研究

根据详实的野外资料对新疆阜康 -吉木萨尔断裂带的构造几何特征和活动性进行了分析与研究 ,结果表明 :断裂带由东、西两大段组成 ,西段由 4条次级S倾逆断裂左行斜列组成 ,东段由 3条次级S倾逆断裂右行斜列组成 ,总体上呈向北微凸的近EW向展布 ,长达 14 0km ,控制着东天山北缘的第四纪构造演化和地貌发育 ;组成断裂往往是低角度的逆断层 ,与褶皱共生 ,切割深度 5～ 6km ,第四纪晚期多期 (次 )活动 ,以间歇性稳定滑动为特征 ;断裂带端部段落倾角较大 ,活动量较小 ,全新世平均垂直滑动速率为 0 .10～ 0 4 0mm/a ,中部段落以低倾角的推覆为特征 ,活动强烈 ,全新世平均垂直滑动速率达 0 80～ 1 0 0mm/a以上     

闽粤沿海全新世垂直构造运动的速率

基于华南地区新构造运动具有断块垂直差异运动的特征,本文主要根据目前已测定的,分布于闽粤沿海地区的若干个全新世海相沉积物的放射性年代,海拔高度等数据,初步估算和对比闽粤沿海不同断块构造区的垂直构造运动的速率,并探讨它与地震活动的关系     

基于GPS观测的地壳水平运动划分活动地块的试验

本文分析了板内块体与板块运动的差别,提出以Ｂｕｒｓａ公式作为板内块体的运动学模型,并据此提出了划分板内活动地块的方法。根据华北ＧＰＳ网１９９５、１９９６和１９９９年的３期观测成果,用本文提出的数学模型和方法,将华北北 剖地区划分为８个小块体。本文用地壳水平运动划分的结果与用本区地壳垂直运动划分的结果在是体旧一致或相近的。本文的划分结果与新构造运动也基本一致,本区活动块体的现今运动是新构造的继承和发     

GEOMORPHIC FEATURES AND LATE QUATERNARY SLIP RATE OF THE SOUTHERN ZONGWULONG SHAN FAULT

With the continuous collision of the India and Eurasia plate in Cenozoic, the Qilian Shan began to uplift strongly from 12Ma to 10Ma. Nowadays, Qilian Shan is still uplifting and expanding. In the northern part of Qilian Shan, tectonic activity extends to Hexi Corridor Basin, and has affected Alashan area. In the southern part of Qilian Shan, tectonic activity extends to Qaidam Basin, forming a series of thrust faults in the northern margin of Qaidam Basin and a series of fold deformations in the basin. The southern Zongwulong Shan Fault is located in the northeastern margin of Qaidam Basin, it is the boundary thrust fault between the southern margin of Qilian Shan and Qaidam Basin. GPS studies show that the total crustal shortening rate across the Qilian Shan is 5~8mm/a, which absorbs 20% of the convergence rate of the Indian-Eurasian plate. Concerning how the strain is distributed on individual fault in the Qilian Shan, previous studies mainly focused on the northern margin of the Qilian Shan and the Hexi Corridor Basin, while the study on the southern margin of the Qilian Shan was relatively weak. Therefore, the study of late Quaternary activity of southern Zongwulong Shan Fault in southern margin of Qilian Shan is of great significance to understand the strain distribution pattern in Qilian Shan and the propagation of the fault to the interior of Qaidam Basin. At the same time, because of the strong tectonic activity, the northern margin of Qaidam Basin is also a seismic-prone area. Determining the fault slip rate is also helpful to better understand the movement behaviors of faults and seismic risk assessment.Through remote sensing image interpretation and field geological survey, combined with GPS topographic profiling, cosmogenic nuclides and optically stimulated luminescence dating, we carried out a detailed study at Baijingtu site and Xujixiang site on the southern Zongwulong Shan Fault. The results show that the southern Zongwulong Shan Fault is a Holocene reverse fault, which faulted a series of piedmont alluvial fans and formed a series of fault scarps.The 43ka, 20ka and 11ka ages of the alluvial fan surfaces in this area can be well compared with the ages of terraces and alluvial fan surfaces in the northeastern margin of Tibetan Plateau, and its formation is mainly controlled by climatic factors. Based on the vertical dislocations of the alluvial fans in different periods in Baijingtu and Xujixiang areas, the average vertical slip rate of the southern Zongwulong Shan Fault since late Quaternary is(0.41±0.05)mm/a, and the average horizontal shortening rate is 0.47~0.80mm/a, accounting for about 10% of the crustal shortening in Qilian Shan. These results are helpful to further understand the strain distribution model in Qilian Shan and the tectonic deformation mechanism in the northern margin of Qaidam Basin. The deformation mechanism of the northern Qaidam Basin fault zone, which is composed of the southern Zongwulong Shan Fault, is rather complicated, and it is not a simple piggy-back thrusting style. These faults jointly control the tectonic activity characteristics of the northern Qaidam Basin.     

Stream profile analysis,tectonic geomorphology and neotectonic activity of the Damxung‐Yangbajain rift in the south Tibetan Plateau

The Damxung‐Yangbajain rift is one of the most active north–south trending rifts in the south Tibetan Plateau, and it has been playing an important role in accommodating the east–west extension of the Tibetan Plateau. Both stream profiles on the Nyainqentanglha Range adjacent to the northwest part of the Damxung‐Yangbajain rift and tectonic geomorphology in the north of the rift are analyzed to assess the spatial pattern and intensity of rock uplift which is related to neotectonic activity. A total of 85 stream profiles across the Nyainqentanglha Range are analyzed, and 111 knickpoints are interpreted. Most of these stream profiles are characterized by prominent convexities with two or more knickpoints, many of which are formed due to the strong rock uplift evidenced by abnormal concavity and extremely high steepness indices during the Quaternary. Neotectonic activity in this region is well replicated in the stream profile indices and offset landforms. Tectono‐geomorphic analysis shows that the concavity and steepness indices correlate with the fault movements at many places. The Damxung‐Yangbajain rift is characterized by left‐lateral strike‐slip in the north of Damxung and by normal movement in middle and southern parts. The middle and southern parts have been undergoing higher uplift than has the northern area. It is most likely that the strong uplift is related to the heat flow under the crust. Earthquakes occurring in the Damxung‐Yangbajain rift, including a M8 in 1411 and M6.6 in 2008, are thought to be related to heat flow activity. All of the stream profile indices and tectonic geomorphology show that the Damxung‐Yangbajain rift is not in a stable state. Copyright © 2016 John Wiley & Sons, Ltd.