1999年台湾集集大地震的地表断层破裂特征   总被引：18，自引：2，他引：16       下载免费PDF全文

王彦斌  王永  李建成 《地震地质》2000,22(2):97-103

野外考察结果表明 ,1999年 9月 2 1日台湾集集大地震是由车笼埔断层发生逆冲作用造成的。地震产生的地表破裂长约 80km ,具有明显的挤压逆断层特征 ,其活动方式为具左旋性质的逆倾滑动。实测逆冲断层以 30°～ 50°的角向西北逆冲而上。断层的垂直位移量 ,南段约 2～ 3m ,北段约 3～ 8m ;断层的水平位移量 ,南段 0～ 3m ,北段 3～ 5m ;垂直断层的水平缩短量 ,南段 2～ 3m ,北段 3～ 6m。从台湾西部麓山带的地质构造剖面分析 ,地震震源恰好位于台湾西部麓山带中生代基底与其上的沉积盖层的界面的深度 ,而西部麓山带第三纪地层和其下的基底的分离面为一滑动面 (decolle ment)。在菲律宾海板块的挤压作用下 ,沿该区中生代基底之上滑动面的错动导致了地震的发生  相似文献   

影响深埋长隧道岩爆的主要因素分析   总被引：3，自引：0，他引：3  

张斌  符文熹  聂德新  任光明 《山地学报》2000,18(Z1):94-97

岩爆是深埋长隧道的主要工程地质问题之一。影响岩石发生岩爆的主要因素有围岩性质、埋深、区域构造应力、地形地貌、活断层和地震等。文中对上述因素对岩爆的影响进行了分析,并指出精细的地面地质调查是合理评价深埋长隧道岩爆的基础。  相似文献   

石油企业抗震防灾规划信息管理系统的设计   总被引：1，自引：0，他引：1       下载免费PDF全文

曾海容  徐鹏飞  宋惠珍  王优龙 《地震地质》1999,21(3):283-287

基于石油企业抗震防灾工作对网络与数据库的信息管理系统的需求,对数据库产品进行了简要分析,并根据石油企业抗震防迷规划的需求和信息管理的一般模式,提出了石油企业抗震防灾规划信息计算机管理系统的设想。认为,以Ｍｉｃｒｏｓｏｆｔ Ａｃｃｅｓｓ数据库软件为基础,利用ＶＢ或ＶＣ等可视化前端应用开发工具,是目前比较好的方案,它将使石油企业抗震防灾规划工作在办公自动化方面迈向新的台阶。  相似文献   

Numerical simulation of ground flow caused by seismic liquefaction     

S. Tamate  I. Towhata 《Soil Dynamics and Earthquake Engineering》1999,18(7):1079

Flow failure of sandy subsoil induced by seismic liquefaction is known to cause significant damage to structures. It is induced not only by the dynamic forces exerted by seismic acceleration but also by the static gravity force in consequence of the topography of the ground. The ground flow may sometimes continue after the end of the seismic loading and finally the ground is significantly deformed to cause a failure.This paper numerically predicts the magnitude of flow that could occur when soil liquefaction continues for a sufficiently long period. It is considered that liquefied soil behaves like a viscous liquid, and hence, ground flow is governed by the principle of minimum potential energy. In the calculation, liquefied sand is assumed to be a viscous liquid that deforms in undrained conditions with its volume remaining constant. To consider the non-linearity due to large displacement, the updated Lagrangian method is used to solve the equation of motion. The Newmark β method is employed to calculate the time history of the ground motion. Finally, a simulation using this calculation method shows that the proposed method gives reasonable results for the conditions indicated.  相似文献   

Dynamic soil–structure interaction analysis via coupled finite-element–boundary-element method     

M. Yazdchi  N. Khalili  S. Valliappan 《Soil Dynamics and Earthquake Engineering》1999,18(7):502

In this paper, a study on the transient response of an elastic structure embedded in a homogeneous, isotropic and linearly elastic half-plane is presented. Transient dynamic and seismic forces are considered in the analysis. The numerical method employed is the coupled Finite-Element–Boundary-Element technique (FE–BE). The finite element method (FEM) is used for discretization of the near field and the boundary element method (BEM) is employed to model the semi-infinite far field. These two methods are coupled through equilibrium and compatibility conditions at the soil–structure interface. Effects of non-zero initial conditions due to the pre-dynamic loads and/or self-weight of the structure are included in the transient boundary element formulation. Hence, it is possible to analyse practical cases (such as dam–foundation systems) involving initial conditions due to the pre-seismic loads such as water pressure and self-weight of the dam. As an application of the proposed formulation, a gravity dam has been analysed and the results for different foundation stiffness are presented. The results of the analysis indicate the importance of including the foundation stiffness and thus the dam–foundation interaction.  相似文献   

Power Law Distribution of Broadband Radiated Energy for Global Seismicity     

Wu ZhongliangInstitute of Geophysics  China Seismologlcal Bureau  Beijing  China 《中国地震研究》1999,(4)

The claim that there exists a transition of earthquake energy distribution between small and large earthquakes is checked using broadband radiated energy of earthquakes for global seismicity. Scattering of the relation between the magnitude and the broadband radiated energy makes it necessary to use the energy data directly. Rank-ordering statistics is applied to enhance the resolution in retrieving the power law distribution with undersampled data, namely, a few tens of events. Seen in the perspective of broadband radiated energy with higher resolution, there is no evidence for the kink in the frequency-energy distribution for large and small earthquakes. Instead, a single power law can well explain the data. For earthquakes with energy larger than 10~(14) J, we find that the number N of events with energy E depends on E via N ∝ E-B, with the scaling constant B = 0.64 ± 0.04, corresponding to b = 0.95± 0.06.  相似文献   

西南日本中央剪切构造带晚第四纪以来位错特征与地震          下载免费PDF全文

向宏发  池田安隆  张晚霞  何宏林 《地震工程学报》1999,21(4):370-377

野外考察和室内综合分析表明,日本中央构造线的右旋位错自上新世以来一直延续至今.资料表明,晚更新世以来的平均位错速率达6 .1 m m/a .高滑动速率而近1 ka 来无强破坏性地震发生的事实意味着该断裂现今可能处在蠕滑运动为主的相对稳滑状态.断裂带结构简单、走向稳定、高角度而无横向断裂切割等特点有利于断裂的蠕滑运动.  相似文献   

聊古一井氦异常与地震的关系   总被引：1，自引：0，他引：1       下载免费PDF全文

魏汝庆 《地震工程学报》1999,21(4):428-429

处理了聊古一井1981 ～1984 年氦的观测资料,发现在两次较近的地震(1981 年宁晋MS5 .8 和1983 年菏泽MS5 .9) 前,氦都有明显的形态相似的异常变化.  相似文献   

柴达木盆地两条中央断裂的特征及其发生上限震级地震的位移量估算   总被引：1，自引：0，他引：1       下载免费PDF全文

王赞军  张晓青  江志萍  张晓梅 《地震工程学报》1999,21(2):183-188

在收集整理最新取得的柴达木盆地南、北中央断裂物、化探资料的基础上,分析了这两条断裂的构造活动特征及其未来发生地震的危险性并粗略计算了各断层段发生上限震级地震的地表位移量以供工程界参考。  相似文献   

南黄海6.1级地震后强震活动趋势的初步研究   总被引：3，自引：1，他引：2       下载免费PDF全文

门可佩 《地震工程学报》1999,21(1):107-109

根据江苏南黄海地区（３１°～３５°Ｎ,１１９°～１２３．５°Ｅ）１５００～１９９６年Ｍ≥６强震资料,应用有序性分析、可公度性分析等方法,对１９９６年南黄海６．１级地震后强震趋势进行了跟踪预测研究．结果表明,未来Ｍ≥６强震可能发生在２００２～２００３年  相似文献