Prediction of strong ground motion at EURO-SEISTEST site using the empirical Green's function method     

Katsuhiro Kamae  Pierre-Yves Bard  Kojiro Irikura 《Journal of Seismology》1998,2(3):193-207

This paper presents some tests on the empirical Green's function method, performed in order to check its effectiveness to predict strong ground motion during future large earthquakes. These investigations basically consist of blind or pseudo-blind tests using part of the data set obtained at the Volvi (Greece) test-site within the framework of the EURO-SEISTEST project. In a first step, a moderate event (M_L=4.1) is simulated by using a small event (M_L=2.5), and taking into account the a priori knowledge of the relevant source parameters (magnitude and stress-drop) for both the base and target events. This check emphasizes the sensitivity of the prediction to the stress-drop values. In a second step, a pseudo-blind prediction is carried out in which the information on the target event is only the magnitude (M_L=5.3) besides the geometrical parameters such as source location, strike and dip. The other important parameters (seismic moment, fault area, stress-drop) are determined on the basis of specific empirical scaling laws derived from several small and moderate events occurring in the area. The synthetic motions are computed for two nearby sites, which are located on the southern edge and in the center of the Mygdonian graben, respectively, and correspond to much different site conditions: weathered rock and thick sediments. They are found in good agreement with the observations, which were unveiled after the simulation. In particular, the amplitude and the phase of the late, local surface waves generated on the southern edge of the graben, are very well reproduced at valley center. Finally, the last step is an attempt to predict strong ground motion for a hypothetical large earthquake of magnitude M_L=6.5. The results are shown to depend very significantly on the scaling laws.  相似文献   

公网盲区泥石流监测中无线传输技术的应用     

李源  高嵩  李国明 《地质灾害与环境保护》2012,23(3):84-87

为监测公网盲区地质灾害,提出采用无线信号将前端传感器采集的数据传输到主站,然后使用公网信号再将数据传输到后端指挥中心.对珠峰保护区泥石流沟公网盲区泥石流的监测实验表明,该方法是可行的.  相似文献   

构造叠加晕找盲矿法及其在矿山深部找矿效果   总被引：7，自引：0，他引：7       下载免费PDF全文

李惠  张国义  禹斌  李德亮 《地学前缘》2010,17(1):287

构造叠加晕找盲矿法是在发展了原生晕找盲矿理论基础上,根据热液矿床成矿成晕严格受构造控制,热液矿床具有多期多阶段叠加成矿成晕特点,提出原生晕叠加理论,解决了困惑化探专家几十年在研究原生晕轴向分带中出现的"反常"现象难题,独创了构造叠加晕找盲矿新方法,并介绍了构造叠加晕方法特点、主要成果、金矿床4种叠加结构的理想模式和盲矿预测的5条准则,应用效果和找矿实例。  相似文献   

某尾矿库排渗功能恢复方法     

陈亮  王辉 《中国勘察设计》2010,(8):92-94

由于某尾矿初期坝已基本失去原有的设计排渗功能,随着尾矿库库内尾矿的不断积聚,其工程问题日益突出,主要表现形式为散浸和集中渗漏,症状为坝面坝前沼泽化、管涌和流土。本文简要介绍了该尾矿库采用垂直排渗-盲沟联合排渗技术的处理方案,及其达到的效果。  相似文献   

基于误差函数的双模式混合盲均衡算法     

张艳萍  纪磊 《南京气象学院学报》2013,5(3):262-266

针对基于统计量和瞬时量盲均衡算法的特点,在分析双模式算法切换方式的基础上,提出了一种基于误差函数的双模式混合盲均衡算法.该算法针对修正的常数模算法(MCMA)和判决导引算法(DD)特点,利用2种算法误差函数间的互相关性,提出了新的加权因子选取方法,动态控制双模式混合下2种算法的权重比例,更为准确地控制切换时机,即使在误判决的情况下也能因其动态特性切换回合适的权重比例.水声信道仿真实验进一步说明了该算法在收敛速度上的优越性.  相似文献   

频率下降率法对2011年新西兰6.3级地震液化的盲测     

孙锐  唐福辉  袁晓铭 《岩土力学》2011,32(Z2):383-388

场地液化实时监测是减轻地震灾害的新手段,其核心是建立依据强震记录识别场地液化技术,但目前建立的方法尚不成熟,可靠性也缺少实际地震的检验。2011年新西兰地震中液化及其震害现象显著,为检测现有液化识别方法提供了条件。利用该次强震记录,采用孙锐和袁晓铭以往提出的频率下降率法对记录场地液化进行了盲测,为今后方法改进提供思路。针对震中距小于50 km的全部27条原始强震记录进行了识别,有9个场地识别为液化场地,其余为非液化场地;对两个已报道为液化的场地,频率下降率法给出了正确的识别结果;识别出的液化场地主要集中在克赖斯特彻奇市东侧Avon河两岸,这一结果与报导定性相符;发现有两个场地原始强震记录存在疑点,经处理后给出了修正结果。  相似文献   

云南洞穴盲金线鲃一新种(鲤形目:鲤科)     

李维贤  杨洪福  韩非  陶成鹏  洪艳  陈宏 《广东海洋大学学报》2007,27(4):1-3

描记采于云南省邱北县一地下洞穴盲金线鲃一新种,以其头上骨质突形状如鹰喙命名鹰喙角金线鲃Sinocyclocheilus aquihornes sp.nov.。新种头形及完全退化的眼与分布于云南泸西阿庐古洞的透明金线鲃S.hyalinus Chen et Yang(1994)相近,但有下列特征可区别:1)角形如鹰喙,后者为一向前的直突起;2)侧线完全,侧线鳞为36,后者侧线不完全,侧线鳞孔9-11;3)背鳍起点位于体中点,至吻端的距离等于至尾鳍基的距离;后者背鳍起点位于体中点之后,至吻端的距离大于至尾鳍基的距离。  相似文献   

基于常函数的抗几何变换的矢量地理数据水印算法     

杨成松  朱长青 《测绘学报》2011,40(2):256-261

基于常函数对于某些变换具有的不可变性,本文对抗几何变换的矢量地理数据水印算法进行研究。首先,对常函数的概念及其特征进行阐述,并推证了一个抗旋转、平移和放缩攻击的常函数;然后,基于建立的常函数,通过把水印信息嵌入到几何不变量中,提出了一种抗几何变换的矢量地理数据水印算法;最后,对提出的水印算法的鲁棒性进行了实验分析。实验结果表明,提出的算法能抵抗压缩、增点、删点、裁剪、平移、旋转、放缩以及由以上攻击组成的复合攻击,具有较好的鲁棒性。  相似文献   

液化识别方法盲测对比——以2011年2月22日新西兰6.3级地震为例     

孙锐  袁晓铭  唐福辉 《地震工程与工程振动》2011,31(3):1-10

液化实时监测作为减轻地震灾害的新手段,其核心技术是建立依据强震记录识别场地液化的方法,但目前所提出的方法十分有限,可靠性也缺少实际地震检验.2011年新西兰地震中液化及其震害现象显著,为检验现有液化识别方法提供了条件.目前已有并可供程使用的四种液化识别方法为:Miyajima法、Suzuki法、KY法(Kostadin...  相似文献   

Geophysical characterisation of a blind I-type pluton emplaced within the Bundarra Suite S-type granites of the New England Batholith     

F. S. Genske  R. H. Flood  M. A. Lackie 《Australian Journal of Earth Sciences》2013,60(3):435-446

Geophysical data are presented that characterise a blind pluton, the Mountain Home Pluton (MHP), which intrudes the southern portion of the Bundarra Suite (BS), 30 km northeast of Bendemeer, New South Wales. A positive magnetic anomaly within the non-magnetic granites of the BS (Banalasta and Pringles Monzogranites) was previously identified as a sub-surface intrusion. Interpretation of new gravity data and analysis of aeromagnetic data are used to infer the depth, size, density, magnetic susceptibility and likely petrology of the pluton. The best-fit model indicates that the MHP is very similar to the Looanga Monzogranite, a felsic member of the Moonbi Suite of the New England Batholith (NEB) that intrudes the BS 5–7 km southeast of the MHP. The top of the MHP is inferred to lie about 1 km beneath the surface and the pluton extends to a depth of at least 6 km. Our model furthermore suggests that the southwestern margin of the MHP is subvertical, whereas a shallower dip (<45°) towards the north is proposed for the northeastern surface of the pluton. A north-trending dyke swarm, identified on the basis of linear positive magnetic anomalies, may be related to the MHP. This swarm of more than 20 relatively magnetic dykes extends out to about 10 km north from the pluton. Magnetic modelling of the dykes indicates that susceptibility values of the dykes are probably very similar to the range of the MHP, and also suggests the width of individual dykes (also not known to be exposed at the surface) to be at most a few tens of metres. A petrographic examination of the intruded BS granites at the surface suggests that metamorphic zoning as seen in mineralogical characteristics may be related to the underlying pluton.  相似文献