陕西中南部的视应力场研究   总被引：2，自引：1，他引：2       下载免费PDF全文

王卫东  张永志  邵广周  刘国华  邹志伟  狄秀玲 《地震工程学报》2004,26(4):343-346

利用西安数字地震台网的宽频带数字地震记录，计算了陕西中、南部地震的视应力水平，并讨论了泾阳5．2级地震前后地震视应力的时间变化特征及视应力与震级的关系。  相似文献   

流动地磁测量中地震异常信息的探索          下载免费PDF全文

刘义高  胡诚  张明  李立风  潘海涛 《地震工程学报》2004,26(4):353-356

S方法将同一测期一条流动地磁测线各测点的变化叠加，可抑制单个测点的干扰，使可能存在的震磁异常信息凸现。本研究了安徽省流动地磁测线S异常与邻近地区小震震群活动频次和中强地震的关系；探讨了“震情窗”地区S异常与“震情窗”相关地区中强地震的相关性；讨论了同一测期流动地磁测线各测点δf“同向变化”现象。  相似文献   

黑龙江省及其邻区非构造性地震振动研究     

孟宪森  郑辉  关玉辉  王晓峰  姜锦华 《中国地震》2004,20(2):197-203

应用周期-频度谱方法对黑龙江省数字地震台网资料进行处理，给出了矿震、电缆应力释放、震源车作业、火山地震等振动的周期-频度谱和链波指数，并对构造地震和爆破的链波指数进行了讨论。针对港震公司的数字地震记录格式编写了专门的处理程序，为数字地震台站开展周期-频度谱分析提供了有力的工具。  相似文献   

多尺度分解在地震信号处理中的应用   总被引：1，自引：0，他引：1  

陈飞  赵永  刘阳  周云好 《中国地震》2004,20(4):405-409

利用小波分析中的多尺度分解及信号消噪技术，对记录不清、信噪比小、震相无法辨认的地震信号进行处理。结果表明：多尺度分解在弱震信号提取和弱震相的识别等方面有很好的效果。  相似文献   

福建及台湾海峡地震预警工程架构探索   总被引：2，自引：0，他引：2  

王洪涛  陈箴 《福建地震》2004,(2)

福建及台湾海峡是海陆板块碰撞到板内地震活动过渡带 ,东侧毗邻台湾板缘地震带 ,西侧为福建内陆板内地震活动区。这是得天独厚的观测研究大陆边缘地震构造带强震活动及板块动力学的良好地域。当前 ,我国进入全面建设小康社会历史时期 ,为防御地震造成社会灾害 ,实现以人为本 ,防患于未然 ,势必需要建构一个实用化的地震预警工程及其机制。本文即是在对福建及台湾海峡近 30多年以来观测研究的基础上 ,提出应用现代空间技术、数字地震、计算机网络等技术架构地震预警工程与机制的一种设想。  相似文献   

城市应急管理模型之设计   总被引：2，自引：0，他引：2  

危福泉  黄宏生 《福建地震》2004,(2)

随着城市建设的快速发展 ,各类危及国家和人民群众生命财产安全的突发性事故灾害时有发生 ,尽管各有关部门的抢救队伍在实施抢险救援中发挥了积极作用 ,但各抢险救援力量专业单一、分散行动 ,形成不了合力 ,难以及时有效处置重大或特大突发性、综合性、大面积的城市事故灾害 ,特别是像地震以及的美国的 9 1 1那样突发性事故。我们目前开展的震害预测与灾害快速评估系统只是针对地震的 ,而地震是小概率事件。因此要应对城市各种重大突发事件 ,城市有必要建立一种应急机制或综合的应急管理信息系统。根据“数字城市”的思想 ,通过一个通信系统与信息系统集成的平台 ,统一协调公安、消防、急救、交警、公共事业、民防、地震等政府部门 ,为市民提供快速、及时的各种救助和相应的服务。统一报警、统一指挥、快速反应、联合行动 ,从而有效地减少损失。  相似文献   

主键约束在数字化前兆数据服务软件中的关键运用     

陈彩虹  郭皓  陈琳  陈懿德  王启东 《福建地震》2004,(3)

数字化前兆数据库是一个分布式网络数据库SQLServer,数据库的建成运用为预报人员的日常数据分析提供了一个准确的、完整的资源平台。为考虑数据库设计完整性规则 ,本文着重讲述建立两套前兆数据库的过程中 ,主键约束在数字化前兆数据服务软件EPDS的建库及入库中起的重要作用。  相似文献   

川西北倒三角形断块东部区域强震带形成机制与地震活动特征     

蒋良文  王士天  李渝生  王运生 《地球科学进展》2004,(Z1)

川西北倒三角形断块东部区域地处青藏高原东部边缘地带,地跨川西北高原及其与四川盆地过渡带的高山峡谷区,属我国著名的南北向地震带的中段,因其特定的大地构造环境和强烈的现代地壳构造运动,导致其在强大的近东西向构造应力场的驱动和平卧“A”字型控震构造体系的控制下,沿两侧边界断裂向东强力楔入,于“构造急剧收口带”之西侧形成了一个近SN向地跨三大构造单元的强震带,强震沿该带有规律的往返迁移和重复发生,且地震活动强弱具有较明显的分形特征。  相似文献   

In-plane and anti-plane strong shaking of soil systems and structures     

G. Gudehus  R. O. Cudmani  A. B. Libreros-Bertini  M. M. Bühler 《Soil Dynamics and Earthquake Engineering》2004,24(4):319-342

The concept of in-plane and anti-plane shaking is introduced with a rigid block on a plane surface with Coulomb friction. Using a hypoplastic constitutive relation to model the mechanical behaviour of the soil, numerical solutions for a rigid block on a thin dry or saturated soil layer are obtained. The coupled nature of dynamic problems involving granular materials is shown, i.e. the motion of the block changes the soil state—skeleton stresses and density—which in turn affects the block motion. Motions of the block as well as soil response can be more realistically calculated by the new model. The same constitutive equation is applied to the numerical simulation of the propagation of plane waves in homogeneous and layered level soil deposits induced by a wave coming from below. Experiments with a novel laminar shake box as well as real seismic records from well-documented sites during strong earthquakes are used to verify the adequacy of the hypoplasticity-based numerical model for the prediction of soil response during strong earthquakes. The response of a homogeneous earth dam subjected to in-plane and anti-plane shaking is investigated numerically. In-plane and anti-plane shaking is shown to cause nearly the same spreading of a sand dam under drained conditions, whereas under undrained conditions anti-plane shaking causes stronger spreading of the dam. The dynamic behaviour of a breakwater founded on rockfill and soft clay during the 1995 Kobe earthquake is back-calculated to show the good performance of the proposed numerical model also with a structure. Section 9 deals with buildings on mattresses of densified cohesionless soils or fine-grained soils with granular columns, slopes with ‘hidden’ dams and structures on piles traversing clayey slopes to show the suitability of hypoplasticity-based models for the earthquake-resistant design and safety assessment of geotechnical systems.  相似文献   

Deep seismic reflection profiling in the Archaean northeastern Yilgarn Craton, Western Australia: implications for crustal architecture and mineral potential     

B.R. Goleby  R.S. Blewett  R.J. Korsch  D.C. Champion  K.F. Cassidy  L.E.A. Jones  P.B. Groenewald  P. Henson 《Tectonophysics》2004,388(1-4):119

Deep seismic reflection data across the Archaean Eastern Goldfields Province, northeastern Yilgarn Craton, Western Australia, have provided information on its crustal architecture and on several of its highly mineralised belts. The seismic reflection data allow interpretation of several prominent crustal scale features, including an eastward thickening of the crust, subdivision of the crust into three broad layers, the presence of a prominent east dip to the majority of the reflections and the interpretation of three east-dipping crustal-penetrating shear zones. These east-dipping shear zones are major structures that subdivide the region into four terranes. Major orogenic gold deposits in the Eastern Goldfields Province are spatially associated with these major structures. The Laverton Tectonic Zone, for example, is a highly mineralised corridor that contains several world-class gold deposits plus many smaller deposits. Other non crustal-penetrating structures within the area do not appear to be as well endowed metallogenically as the Laverton structure. The seismic reflection data have also imaged a series of low-angle shear zones within and beneath the granite–greenstone terranes. Where the low-angle shear zones intersect the major crustal-penetrating structures, a wedge shaped geometry is formed. This geometry forms a suitable fluid focusing wedge in which upward to subhorizontal moving fluids are focused and then distributed into the nearby complexly deformed greenstones.  相似文献