Blind deconvolution methodology for site-response evaluation exclusively from ground-surface seismic recordings     

A. Zerva  A. P. Petropulu  P. -Y. Bard 《Soil Dynamics and Earthquake Engineering》1999,18(1):805

A novel blind deconvolution methodology for identification of the local site characteristics based on two seismograms recorded on the free surface of a sediment site is presented. The approach does not require recordings at depth nor at a nearby rock outcrop, and eliminates the need for any prior parameterization of source and site characteristics. It considers that the surface recordings are the result of the convolution of the ‘input motion at depth' with transfer functions (channels) representing the characteristics of the transmission path of the waves from the input location to each recording station. The input motion at depth is considered to be the common component in the seismograms (same input in a statistical sense). The channel characteristics are considered to be the part in the seismograms that is non-common, since the travel path of the waves from the input motion location at depth to each recording station is different, due to spatially variable site effects. By means of blind deconvolution, the algorithm eliminates what is common in the seismograms, namely the input motion at depth, and retains what is different, namely the transfer functions of the site from the input location to each recording station. It estimates the site response in both frequency and time domains, and identifies the duration of the site's transfer functions. The methodology is applied herein to synthetic data at realistic sites for performance validation. The blindly estimated results are in almost perfect agreement with the actual site characteristics, indicating that the approach is a promising new tool for seismic site-response identification from recorded data.  相似文献   

大型、特大型金矿盲矿预测的原生叠加晕理想模型   总被引：11，自引：0，他引：11       下载免费PDF全文

李惠  张文华  常凤池 《地质找矿论丛》1999,9(3):25-33

论述了金矿多期多阶段叠加成矿成晕的地质地球化学特征。在研究大型金矿床原生叠加晕模型的基础上,建立了大型金矿床的原生叠加晕理想模型及盲矿预测准则。  相似文献   

柴达木北缘达肯大坂群与滩间山群的接触关系   总被引：3，自引：0，他引：3  

夏元祁 《地层学杂志》1996,20(2):123-127

柴达木北缘古元古界达肯大坂群片麻岩系与上奥陶统滩间山群绿片岩系之间先存的角度不整合已经受到后期滑脱构造变形的强烈改造,是一种变质岩区特有的构造接触关系——隐蔽不整合,从而明确"过渡带"片岩系实质上是一条变质滑脱带,是伸展体制下低角度正断层沿不整合面滑脱拆离的产物,其主体应划归达肯大坂群。  相似文献   

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   

玲珑金矿田东风矿区深部构造叠加晕研究          下载免费PDF全文

刘彩杰  鲍中义  王永庆  范家盟 《山东国土资源》2016,32(3)

东风矿床主要赋存于坡头青主断裂下盘的蚀变带中。在野外地质工作的基础上,运用数学地质分析方法,系统研究了构造叠加晕的特征,建立了构造叠加晕的理想模式。矿区构造叠加晕分析结果显示,金矿成矿具有多期、多阶段的特征,通过研究该区原生晕轴向分带特征,识别出不同成矿阶段所形成的矿体(晕)在空间上具有前尾晕共存的叠加结构,该结构是深部盲矿预测的重要依据。  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   

A fair E-cash scheme based on elliptic curve cryptography     

Wang Changji  Wu Jianping  Duan Haixin 《地球空间信息科学学报》2013,16(3):231-234

A new fair off-line electronic cash scheme on elliptic curve cryptography was presented. The new scheme is more efficient than those by extending fair off-line electronic cash scheme from finite field into elliptic curve cryptography and introducing a new elliptic curve discrete logarithm assumption. The expiry date and denomination are embedded into the blindly signed coin by integrating partially blind signature with restrictive blind signature. A bank need not use different public keys for different coin values, shops and users need not carry a list of bank's public keys to verify in their electronic wallet. At the same time, the bank just needs to keep undue electronic coins for double spending check in his database, thus bank's database can be dramatically reduced.  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   

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   

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