Variations in thickness of fault‐controlled dikes and its implications: A case study of Gosung area,South‐East Korea          下载免费PDF全文

Paul Edwards  Jin‐Hyuck Choi  Young‐Seog Kim 《Island Arc》2017,26(2)

Dikes are natural records that can be used to understand the way magma flows in the crust. Coastal platform outcrops in Gosung, South Korea, show clear evidences that their intrusion took place along pre‐existing fractures. We analyzed outcropping dikes, measuring variations in dike thickness as well as fracture density (cumulative number of fractures along strike) and geometry around the dikes. The geometry and thickness variations of dikes intruded along pre‐existing fractures can be interpreted to understand the effect of pre‐existing fractures to evolution on magma flow, especially related with fault damage zones. This helps us to gain a better understanding of magma and fluid flow along pre‐existing fractures. Magma flow is greater along planes that strike perpendicular to the direction of least compressive horizontal stress, and along well connected fractures that show a high degree of connectivity. At the fault tip and linkage damage zone, there is a concentration of extensional fractures; in these areas injected dikelets can form. As faults become linked, the fracture density increases, until they become fully linked and act as one through‐going fault plane. As faults evolve, the boundary conditions of the faults vary and this has an impact on dike characteristics. Fracture geometry around dikes that intruded pre‐existing faults can be used as a record of fault evolution and this can give insights into how the maturity of a fault system can affect to the related magma or fluid flow characteristics.  相似文献   

省市县三级自然资源数据应用模式研究   总被引：1，自引：1，他引：0  

周国新  万宝林 《测绘通报》2019,(7):114-117

自然资源管理工作涉及诸多方面,随着信息化的发展,各种信息系统相继建立起来,用以支撑不同的业务,也逐渐积累了大批的数据成果,包含了自然资源领域的不同专题。这些成果投入应用提升了自然资源的公共服务能力。大数据的到来,要求部门之间要紧密联系,融合共享。而现实是信息系统仍然相互独立,给自然资源大数据的应用带来了障碍。本文以广东省建设用地审批系统作为案例,通过对自然资源省市县三级应用模式展开研究,提出了基于ESB总线的自然资源省市县三级应用服务技术,探讨了其研究方法、系统设计和工作模式,为该技术的应用和推广提供参考。  相似文献   

武汉都市圈经济联系的空间结构   总被引：52，自引：4，他引：48  

刘承良  余瑞林  熊剑平  朱俊林  张红 《地理研究》2007,26(1):197-209

都市圈空间结构是城市体系中最综合、最富于变化的热点部分。基于武汉都市圈近年来的统计资料,构建经济联系强度模型,定量分析武汉都市圈空间竞争与范围的动态性特征:中心城市对外经济联系存在主要方向,具有时间惯性,空间极化明显;地域空间上经济联系作用强度距离衰减,形成圈层结构分异。从点、线、面组合关系角度,构建节点中心性、通道网络性、范围系统性指标,定量揭示出武汉都市圈经济联系的空间结构等级层次性特征:中心城市中心性等级差异明显,空间分布不均,与交通地理区位紧密相关;主要通道与侍服能力也存在等级层次性,明显形成两城际交通走廊;中心城市腹地范围与自身外向经济联系强度密切相关,受自然地理、行政区划影响明显。  相似文献   

基于财富中国500强企业的中国城市群城市网络联系分析   总被引：1，自引：1，他引：0  

李艳  孙阳  姚士谋 《地理研究》2020,39(7):1548-1564

现有城市网络研究多集中于城市联系及各城市群内部的空间关联,多以企业总分机构关系型数据研究中国城市网络结构,尚较少涉及中国城市群城市网络联系的整体认知。本文基于财富中国500强中的311家金融与专业性服务企业数据,分析中国19个城市群及41个主要城市间城市网络联系,借助企业在属地城市群层面的跨尺度空间表达,依据关系地理将城市群视为互相联系的空间集合,运用网络分析与互锁网络模型相结合的方法,重点分析城市群金融与专业服务业城市网络联系。结论如下：一方面,中国城市群整体形成以京津冀、长三角、珠三角、成渝、山东半岛与长江中游城市群为核心的空间组织体系,并与国家中心城市分布特征一致。关中平原、辽中南、滇中等13个城市群为非核心层级空间组织,是中国城市群空间拓展的重要支撑。另一方面,城市群城市网络联系依赖于金融及专业性服务要素高效优化配置,城市群对外联系范围决定了该城市群对各类服务要素流的控制与配置能力,进而影响其发展地位。其中,京津冀城市群主导商业银行、多元金融投资、保险、会计和律师事务形成的城市网络联系,长三角城市群以绝对优势主导证券企业城市网络联系,长三角、成渝、珠三角城市群共同主导着广告代理、管理咨询企业间的城市网络联系。本文尝试以城市群关系邻近性认知企业行动与城市群间的跨尺度空间联系互馈机理,认为城市群间水平联系对中国城市群城市网络具有重要作用,为国家制定城市群相关政策提供参考。  相似文献   

地震应急联动信息服务技术平台设计探讨   总被引：9，自引：7，他引：2  

姜立新  帅向华  聂高众  杨天青  席楠  李晓杰 《震灾防御技术》2011,6(2):156-163

地震应急联动与紧急救援服务能力是国家地震社会服务能力建设的核心内容,我国的地震应急联动与紧急救援服务能力在研究和建设方面尚处于初级阶段,在未来一段时间将开展地震应急联动信息服务技术平台的建设.因此,地震应急联动信息服务技术平台的构成、设计和实现方式还有许多方面有待进一步研究和探讨.本文根据国家地震社会服务工程的初步设计,对应急联动信息服务技术平台几个方面的内容进行了初步探讨,并在此基础上讨论了其未来的进一步发展.  相似文献   

Oblique slip and the geometry of normal-fault linkage: mechanics and a case study from the Basin and Range in Oregon   总被引：1，自引：0，他引：1  

Juliet G. Crider   《Journal of Structural Geology》2001,23(12)

Map patterns of normal fault linkages near Summer Lake, Oregon, show a systematic relationship between échelon step-sense, oblique-slip sense, and the position of linking faults. Where the step sense is the same as the sense of oblique slip (e.g. left step and left-oblique slip), the faults are linked in the lower part of their relay ramp. Where the step-sense and slip-sense are opposite (e.g. left-step and right-oblique slip), the faults are linked in the upper part of the ramp. A boundary-element code is used to calculate the stress field around échelon normal faults during oblique slip, and the model results reveal a relationship similar to the field observations. If step sense and oblique-slip sense are the same, there is a greater potential for deformation ahead of the tip of the front fault and in the lower part of the ramp. If step sense and oblique-slip sense are opposite, there is a greater potential for deformation ahead of the tip of the rear fault and in the upper part of the ramp. The field-model comparison confirms that oblique slip modifies the mechanical interaction among fault segments and thus influences fault growth and the geometry of fault linkage.  相似文献   

中国城市网络中心性的空间格局及影响因素   总被引：3，自引：2，他引：1  

盛科荣  张红霞  佀丹丹 《地理科学》2018,38(8):1256-1265

利用2016年中国上市公司100强企业网络数据和两阶段隶属联系模型构建中国城市网络,研究了中国城市网络中心性的空间格局,并通过计量方法识别了城市网络中心性的关键影响因素,解析了关键因素的作用机理。结果发现：中国城市网络出度和中介度的空间分布呈现核心-外围结构特征,入度中心性空间分布的集中度相对较低;中国城市的网络功能开始出现层级分化,城市网络的功能结构区别于中心地体系下的等级关系;经济规模、知识资本、航空设施和政治资源是城市网络中心性空间格局的关键影响因素,择优链接是中国城市网络生长发育的重要内在动力。  相似文献   

Growth of normal faults in multilayer sequences: A 3D seismic case study from the Egersund Basin,Norwegian North Sea     

《Journal of Structural Geology》2013

We investigate the structural style and evolution of a salt-influenced, extensional fault array in the Egersund Basin (Norwegian North Sea) through analysis of 3D reflection seismic and well data. Analysis of fault geometry/morphology, throw distribution and syn-kinematic strata reveal an intricate but systematic style of displacement and growth, suggesting an evolution of (1) initial syn-sedimentary fault growth contemporaneous with salt mobilization initiated during the Late Triassic, (2) cessation of fault activity and burial of the stagnant fault tips, and (3) subsequent nucleation of new faults in the cover above contemporaneous salt re-mobilization initiated during the Late Cretaceous, with downward propagation and linkage with faults. Stage 3 was apparently largely controlled by salt mobilization in response to basin inversion, as reactivated faults are located where the underlying salt is thick, while the non-reactivated faults are found where salt is depleted. Based on the 3D-throw analyses, we conclude that a combination of basement faulting and salt (re-) mobilization is the driving mechanisms behind fault activation and reactivation. Even though the sub- and supra-salt faults are mainly geometrically decoupled through the salt, a kinematic coupling must have existed as sub-salt faults still affected nucleation and localization of the cover faults.  相似文献   

PETROCHEMICALS AND ECONOMIC DEVELOPMENT: THE IMPLICATIONS OF THE PUERTO RICAN EXPERIENCE∗     

《The Professional geographer》2013,65(4):405-416

The oil refining and petrochemical industries have occupied an important role in Puerto Rico's development strategy since the early 1960s. However, the hopes epitomized in various planning models of highly integrated and diversified oil-based industrial complexes have not been fulfilled. This paper attempts to account for the discrepancy between official expectations and subsequent events in Puerto Rico and indicates some of the lessons for other developing countries.  相似文献   

“一带一路”与中国对外航空运输联系   总被引：8，自引：2，他引：6  

王姣娥  王涵  焦敬娟 《地理科学进展》2015,34(5)

基础设施互联互通是降低贸易成本、增强国际联系、构建"一带一路"的基本条件。建设国际航空网络与陆路运输通道、海上航运通道,共同组成"一带一路"交通基础设施互联互通的基础。基于2014年的OAG计划数据,本文重点分析了中国与"一带一路"沿线国家的国际航空运输联系空间格局,并运用枢纽度模型识别国际航空枢纽。研究表明:1中国与"一带一路"沿线国家的航空客运联系广度和强度均高于货运,其中国际客运联系集中在泰国、俄罗斯和新加坡等国,而国际货运联系则主要集中在俄罗斯;2中国对外航空网络格局总体上表现为"轴—辐"与"点—点"模式并存;3上海、北京和广州为中国面向"一带一路"沿线国家的国际航空客运枢纽机场,上海同时还是国际航空货运枢纽。  相似文献