Main active faults and seismic activity along the Yangtze River Economic Belt: Based on remote sensing geological survey     

《China Geology》2020,3(2):314-338

The Yangtze River Economic Belt (YREB) spans three terrain steps in China and features diverse topography that is characterized by significant differences in geological structure and present-day crustal deformation. Active faults and seismic activity are important geological factors for the planning and development of the YREB. In this paper, the spatial distribution and activity of 165 active faults that exist along the YREB have been compiled from previous findings, using both remote-sensing data and geological survey results. The crustal stability of seven particularly noteworthy typical active fault zones and their potential effects on the crustal stability of the urban agglomerations are analyzed. The main active fault zones in the western YREB, together with the neighboring regional active faults, make up an arc fault block region comprising primarily of Sichuan-Yunnan and a “Sichuan-Yunnan arc rotational-shear active tectonic system” strong deformation region that features rotation, shear and extensional deformation. The active faults in the central-eastern YREB, with seven NE-NNE and seven NW-NWW active faults (the “7-longitudinal, 7-horizontal” pattern), macroscopically make up a “chessboard tectonic system” medium-weak deformation region in the geomechanical tectonic system. They are also the main geological constraints for the crustal stability of the YREB.  相似文献   

淮南顾桥煤矿新构造运动的证据     

韩必武  韩鹤威  白志钊 《中国煤炭地质》2020,(1):11-17,31

新构造运动系指晚新生代以来的构造运动,其在天然地震研究、煤田地质与油气勘探、城市建设等领域均具有重要的意义。以淮南顾桥煤矿为研究区,结合区域构造背景和顾桥煤矿的地震地质条件,利用地震解释中的层拉平技术恢复研究区典型剖面的古构造地貌,厘定了各条断层的时空配置关系;结合13块钻孔岩心样品的ESR和热释光年龄,定量分析了断层的发育年代。结果表明:研究区存在新构造运动,且与地震层拉平构造演化预测结论吻合;研究成果对于顾桥煤矿的设计和安全生产的意义。  相似文献   

中国城市体系网络化研究   总被引：14，自引：1，他引：13  

胡国建  陈传明  金星星  王强 《地理学报》2019,74(4):681-693

当前,学者普遍认同城市体系研究的重心从等级范式向网络范式转向。在大量的文献梳理基础上,阐述20世纪80年代以来中国城市体系研究范式的转向过程,并进一步梳理中国城市网络研究的进展、问题与关注重点。结果表明：2010年之后,网络成为中国城市体系研究的主流范式,等级体系文献数量呈波动递减趋势,全国和长三角成为热点关注区域;属性数据一定程度上弥补了早期城市网络研究中数据匮乏的状况,关系数据应成为未来研究的侧重点;不同研究视角及其所应用的数据存在着一定的局限性,多元视角的综合研究成为趋势。在此基础上,提出城市网络研究未来可能的突破点,包括：调整国家城市网络的研究框架、超越交通数据直接考察城市间的实体联系、测度企业外部的横向联系、有向加权网络分析和可视化、增加研究中的地理“意味”等。  相似文献   

多维地震下考虑不同破坏准则的输电塔-线体系倒塌分析          下载免费PDF全文

袁光英  潘海洋  马瑞升  田利 《世界地震工程》2019,35(1):184-192

研究了基于不同失效准则多维地震激励下输电塔-线体系的倒塌。根据实际工程，运用ABAQUS有限元分析软件，考虑材料非线性和几何非线性，建立了包含两基输电塔与3跨输电线的大跨越输电塔-线体系三维有限元模型。提出了2种不同的杆件失效准则，采用用户材料子程序，基于动力显式分析方法，研究了大跨越输电塔-线体系在3条典型天然地震波作用下考虑不同失效准则的倒塌机理，并对输电塔的杆件失效、节间位移角以及相对薄弱位置进行了分析。分析结果可以为大跨越输电塔-线体系的抗震设计提供参考。  相似文献   

多维多点激励下考虑支座摩擦滑移及结构碰撞的非规则桥梁抗震性能研究          下载免费PDF全文

闫磊  李青宁  岳克锋  李鲁平  付亚男  蓝仕成  喻国根 《世界地震工程》2019,35(2):068-77

以一座典型山区非规则梁桥为研究对象，建立了该桥梁多维多点激励下的多自由度动力计算模型，研究了该桥梁在多维多点激励下考虑支座摩擦滑移及结构碰撞等非线性因素时的抗震性能。研究结果表明:相比一维地震输入，多维地震可使结构的动力响应增加，桥墩底部弯矩需求增大；相比一致激励，多点激励可使得支座的位移需求增大，且地震波最后到达的桥墩上方支座位移最大；同时考虑多点激励和碰撞效应可使桥墩的弯矩需求增加；水平地震作用下，矮墩上部的支座容易滑动，且双向地震较单向地震更明显，三向地震输入较双向有所增强。因此，对山区非规则梁桥进行抗震设计时应有针对性地进行多维多点地震输入计算，找出结构的最大地震需求，以期指导设计。  相似文献   

基于ArcGIS的多准则地震应急避难所选址规划研究     

张亚楠  高惠瑛 《震灾防御技术》2019,14(2):376-386

地震是极其严重的自然灾害，有可能造成重大伤亡和经济损失。由于城市中人口高度聚集，地震发生时，需将受灾居民快速疏散至应急避难所，因此，应急避难所选址的合理性至关重要。本文提出1种可用于解决选址问题的多准则选址模型，并提出了求解模型的方法。该方法分为3个步骤，首先选择候选应急避难所，其次分析候选避难所的服务范围，最后确定应急避难所的位置。通过案例研究，论证了多准则选址模型在地震应急避难所规划中的有效性。  相似文献   

Gentrification as space domestication. The High Line Art case     

Pier Luigi Sacco  Maria Tartari  Guido Ferilli  Giorgio Tavano Blessi 《Urban geography》2019,40(4):529-554

In this paper, we critically examine the role of artistic locational choices and practices in the context of gentrification processes in urban renewal contexts. We characterize gentrification as a form of domestication of space, and explore the extent to which artistic choices and practices relate to such process with reference to the deontological dilemma of legitimization within the art system vs. responsible empowerment of vulnerable local constituencies. We illustrate our argument with an analysis of the High Line Art project, and show how this can be considered as a textbook example of art-driven space domestication leading to brutal forms of gentrification. We comment on the threat that this provides to the social credibility of artistic practices as an agency of responsible social change.  相似文献   

Analog simulation of urban construction land supply and demand in Chang-Zhu-Tan Urban Agglomeration based on land intensive use     

Xiong  Ying  Chen  Yun  Peng  Fen  Li  Jingzhi  Yan  Xiaojing 《地理学报(英文版)》2019,29(8):1346-1362

Journal of Geographical Sciences - Urban land intensive use is an important indicator in harmonizing the relationship between land supply and demand. The system dynamics (SD) can be used to...  相似文献   

Normal fault growth influenced by basement fabrics: The importance of preferential nucleation from pre‐existing structures     

Luca Collanega  Katherine Siuda  Christopher A.‐L. Jackson  Rebecca E. Bell  Alexander J. Coleman  Antje Lenhart  Craig Magee  Anna Breda 《Basin Research》2019,31(4):659-687

Reactivation of pre‐existing intra‐basement structures can influence the evolution of rift basins, yet the detailed kinematic relationship between these structures and overlying rift‐related faults remains poorly understood. Understanding the kinematic as well as geometric relationship between intra‐basement structures and rift‐related fault networks is important, with the extension direction in many rifted provinces typically thought to lie normal to fault strike. We here investigate this problem using a borehole‐constrained, 3D seismic reflection dataset from the Taranaki Basin, offshore New Zealand. Excellent imaging of intra‐basement structures and a relatively weakly deformed, stratigraphically simple sedimentary cover allow us to: (a) identify a range of interaction styles between intra‐basement structures and overlying, Plio‐Pleistocene rift‐related normal faults; and (b) examine the cover fault kinematics associated with each interaction style. Some of the normal faults parallel and are physically connected to intra‐basement reflections, which are interpreted as mylonitic reverse faults formed during Mesozoic subduction and basement terrane accretion. These geometric relationships indicate pre‐existing intra‐basement structures locally controlled the position and attitude of Plio‐Pleistocene rift‐related normal faults. However, through detailed 3D kinematic analysis of selected normal faults, we show that: (a) normal faults only nucleated above intra‐basement structures that experienced late Miocene compressional reactivation, (b) despite playing an important role during subsequent rifting, intra‐basement structures have not been significantly extensionally reactivated, and (c) preferential nucleation and propagation of normal faults within late Miocene reverse faults and folds appears to be the key genetic relationship between contractionally reactivated intra‐basement structures and rift‐related normal faults. Our analysis shows that km‐scale, intra‐basement structures can control the nucleation and development of newly formed, rift‐related normal faults, most likely due to a local perturbation of the regional stress field. Because of this, simply inverting fault strike for causal extension direction may be incorrect, especially in provinces where pre‐existing, intra‐basement structures occur. We also show that a detailed kinematic analysis is key to deciphering the temporal as well as simply the spatial or geometric relationship between structures developed at multiple structural levels.  相似文献   

乡村振兴规划的性质及其体系构建探讨   总被引：1，自引：0，他引：1  

王介勇  周墨竹  王祥峰 《地理科学进展》2019,38(9):1361-1369

实施乡村振兴战略是解决中国新时代社会主要矛盾的必然要求,关系着国家现代化的成败。落实乡村振兴战略需要建立科学合理的乡村振兴规划体系,统筹协调和优化配置城乡要素资源。论文基于地理学综合视角,深入分析乡村概念内涵与乡村发展的基本特征,总结乡村振兴规划的基本性质与存在的主要问题,初步构建了乡村振兴规划体系框架。结果表明：① 乡村包含社会文化、政治经济和地理空间多重属性,具有生产、生活、生态、文化等多功能,乡村振兴发展是乡村资源开发利用、经济社会发展和自然人文耦合的综合过程;② 乡村系统具有要素分散性和发展自组织性、空间异质性和类型多样性、对区域和城市依赖性与产业发展受自然因素强限制的基本特征;③ 乡村振兴规划是对乡村空间要素资源配置的统筹协调过程,其本质是以促进公平为导向的规划,应更加强调规划参与过程及其统筹协调能力;④ 当前中国乡村规划尚未形成完整体系,缺少法律基础,规划技术理论发展较滞后,规划边界模糊、规划深度不够,规划实施保障机制不健全;⑤ 基于上述理论和问题分析,构建了包含主体规划系统、制度保障系统、技术支持系统、多规协调系统和参与反馈系统的“五位一体”乡村振兴规划体系。该体系可以高效配置乡村要素资源,促进城乡融合发展,有利于形成规划合力,增强乡村振兴规划的权威性、可行性和实用性。  相似文献