本溪地区地震灾害背景浅析     

贾东旭  吴宝东  唐光伟 《东北地震研究》2015,(2)

本溪市位于辽东半岛北端。处于阴山东西向复杂构造带的东延与新华夏系第二巨型隆起带的交接部位，属太子河凹陷带，这两种构造体系在区内复合、交接，奠定了本溪地区的基本构造轮廓，本文主要总结了本溪市区及二县地区的地质构造条件和地震活动概况。  相似文献   

川滇地区断层活动与地震关系研究   总被引：3，自引：1，他引：2       下载免费PDF全文

李瑞莎  张希  王双绪  张四新  薛富平  王继英 《大地测量与地球动力学》2009,29(Z1):20-24

选取川滇地区16个跨断层形变观测点，将断层两盘作为不变形的刚体分析断面相对滑动与断层两盘地表点位相对位移的定量关系，计算了各测点的水平扭动量、垂直位移量以及两者之间的比值，并分析了其与地震活动之间的关系。  相似文献   

地震测井联合物性参数反演在煤炭岩性勘探中的应用     

王秀东  施龙青  陈清静 《华北地震科学》2008,26(3):1-4

基于二维波动方程的物性参数联合反演方法，以常规地震勘探资料为基础、地震地质解释的测井资料为约束，采用线性、非线性反演、神经网络等方法进行地层物性参数预测。其方法保证了反演的成功进行和成果的可靠性，其高分辨率的岩性参数反演成果可有效地用于煤田岩性地震勘探。  相似文献   

利辛ML4．6地震与蒙城地电阻率变化特征     

薛志明  张有林  方素真  汪继林  李雪华 《地震地磁观测与研究》2008,29(6):32-35

以消除年变化等短周期变化后的数据做为当月正常值，利用实测的月均值与正常值之比即月干扰比率、偏差等指标，突出反映月观测值在当月受到综合干扰因素影响的大小。从而突出地震前短临地电阻率异常。  相似文献   

遥感技术在地震研究中的应用进展   总被引：5，自引：3，他引：2       下载免费PDF全文

陈彧  徐瑞松  蔡睿  王洁  苗莉 《地球物理学进展》2008,23(4):1273-1281

本文介绍了遥感技术在地震监测和研究中的应用和进展,分析了卫星热红外遥感、InSAR技术和气体遥感方法在地震前后地表热红外增温、形变和气体含量改变的研究现状,初步探讨了该方法的成因机制.本文同时分析了该技术在地震预报中存在的问题,提出了未来的研究重点.  相似文献   

Optimal design of structures for earthquake loads by a hybrid RBF-BPSO method     

Eysa Salajegheh  Saeed Gholizadeh  Mohsen Khatibinia 《地震工程与工程振动(英文版)》2008,7(1):13-24

The optimal seismic design of structures requires that time history analyses （THA） be carried out repeatedly. This makes the optimal design process inefficient, in particular, if an evolutionary algorithm is used. To reduce the overall time required for structural optimization, two artificial intelligence strategies are employed. In the first strategy, radial basis function （RBF） neural networks are used to predict the time history responses of structures in the optimization flow. In the second strategy, a binary particle swarm optimization （BPSO） is used to find the optimum design. Combining the RBF and BPSO, a hybrid RBF-BPSO optimization method is proposed in this paper, which achieves fast optimization with high computational performance. Two examples are presented and compared to determine the optimal weight of structures under earthquake loadings using both exact and approximate analyses. The numerical results demonstrate the computational advantages and effectiveness of the proposed hybrid RBF-BPSO optimization method for the seismic design of structures.  相似文献   

Correlation failure analysis of an uncertain hysteretic vibration system     

张旭方  张义民  郝秋菊 《地震工程与工程振动(英文版)》2008,7(1):57-65

In this paper, a numerical method for correlation sensitivity analysis of a nonlinear random vibration system is presented. Based on the first passage failure model, the probability perturbation method is employed to determine the statistical characteristics of failure modes and the correlation between them. The sensitivity of correlation between failure modes with respect to random parameters characterizing the uncertainty of the hysteretic loop is discussed. In a numerical example, a two-DOF shear structure with uncertain hysteretic restoring force is considered. The statistical characteristics of response, failure modes and the sensitivity of random hysteretic loop parameters are provided, and also compared with a Monte Carlo simulation.  相似文献   

Simplified approach for design of raft foundations against fault rupture. Part Ⅱ： soil-structure interaction     

I. Anastasopoulos  ;N. Gerolymos  ;G. Gazetas  ;M. F. Bransby 《地震工程与工程振动(英文版)》2008,7(2):165-179

This is the second paper of two, which describe the results of an integrated research effort to develop a four-step simplified approach for design of raft foundations against dip-slip （normal and thrust） fault rupture. The first two steps dealing with fault rupture propagation in the free-field were presented in the companion paper. This paper develops an approximate analytical method to analyze soil-foundation-structure interaction （SFSI）, involving two additional phenomena： （i） fault rupture diversion （Step 3）; and （ii） modification of the vertical displacement profile （Step 4）. For the first phenomenon （Step 3）, an approximate energy-based approach is developed to estimate the diversion of a fault rupture due to presence of a raft foundation. The normalized critical load for complete diversion is shown to be a function of soil strength, coefficient of earth pressure at rest, bedrock depth, and the horizontal position of the foundation relative to the outcropping fault rupture. For the second phenomenon （Step 4）, a heuristic approach is proposed, which ＂scans＂ through possible equilibrium positions to detect the one that best satisfies force and moment equilibrium. Thus, we account for the strong geometric nonlinearities that govern this interaction, such as uplifting and second order （P-△） effects. Comparisons with centrifuge-validated finite element analyses demonstrate the efficacy of the method. Its simplicity makes possible its utilization for preliminary design.  相似文献   

使用NCEP数据分析新疆于田地震前异常增温   总被引：1，自引：0，他引：1  

秦凯  王斌  郭广猛  杨杰 《吉林大学学报(地球科学版)》2008,38(6)

美国国家环境预测中心(NCEP)全球再分析资料为监测地震异常提供了新的数据源。分析了2008年3月21日新疆7.3级地震前一个月的NCEP数据,发现2月18日06时(UTCS世界标准时间)在震中附近的断层带上出现温度异常,随后异常持续并向震中位置靠近。20日18时,异常区域完全覆盖震中位置,增温幅度达到7 K。21日12时异常结束。分析表明:温度异常区域与断层分布具有一致性,增温中心对应未来震中位置,增温幅度和发震震级可能存在对应关系,这对预测地震具有重要意义。  相似文献   

抚仙湖老鹰地太阳观测基地的地质概况与地震危险性初析     

张子雄  楼柯 《天文研究与技术》2008,5(2)

云南天文台抚仙湖老鹰地太阳观测基地处于小江断裂带两侧分支的控制之下,但该基地址点的地质构造未见断裂错动.址点之东5000m,北1000m,南1500m,P1-P2β-C等地层未见缺失,组成由P2β玄武岩为核,P1、c等地层为翼的向斜构造.因此,该地块是断裂带中相对稳定的地质小块体,址点的地层为P1虎斑状灰岩、白云岩夹白云质灰岩是溶蚀岩层.应注意和防范抚仙湖水体的浪蚀对石灰岩本体的溶蚀等潜在的地质缺陷.虽说抚仙湖老鹰地太阳观测基地所处地块是地震活动带中相对稳定的地质块体,但它不能脱离小江断裂带西侧分支的控制,因此,在基建规划和实施中应作抗Ⅷ度地震的技术防范.  相似文献