储水层质量守恒方程的简化及在垂向弹性形变假定下与水流方程的耦合

给出了非固结储水层的质量守恒方程在不同假定条件下的简化形式及其物理意义,并揭示水的非稳定渗流与储水层形变之间的相互因果关系及形变量与储(释)水量之间的体积交换关系.通过垂向弹性形变假定下,储水层形变质量守恒方程与渗流方程的耦合分析发现,细粒储水层由于水头变化导致骨架对水的弹性储存或释放而引发的任一点处的垂向应变,等于其储水层的总弹性储(释)水率或骨架弹性储(释)水率与水头增量的乘积,该公式实际上为计算地面沉降的分层总和法提供了基本理论依据.     

THE EVALUATION OF ECO－ENVIRONMENTAL SUSCEPTIBILITY TO HUMAN ACTIVITY IN YULIN REGION

ＴＨＥＥＶＡＬＵＡＴＩＯＮＯＦＥＣＯ－ＥＮＶＩＲＯＮＭＥＮＴＡＬＳＵＳＣＥＰＴＩＢＩＬＩＴＹＴＯＨＵＭＡＮＡＣＴＩＶＩＴＹＩＮＹＵＬＩＮＲＥＧＩＯＮ陈利顶，傅伯杰ＴＨＥＥＶＡＬＵＡＴＩＯＮＯＦＥＣＯ－ＥＮＶＩＲＯＮＭＥＮＴＡＬＳＵＳＣＥＰＴＩＢＩＬＩ...     

一类与算子有关的级数转化公式

利用算子之间的相互关系将算子g(xΔ)展成3种不同的形式,构造一些级数转化公式,并结合Eulerian多项式简化这些级数转化公式、最后讨论这些级数转化公式在寻找求和公式及组合恒等式证明中的一些应用。     

全球位系数模型构建高精度局部重力场的Clenshaw求和

给出了勒让德函数4种模式的Clenshaw求和公式,在此基础上得到由全球位系数模型计算重力场参数的二阶Clenshaw求和公式,分析了EGM96与WDM94应用于某试验测区局部重力场的精度,为该测区在构建高精度局部重力场时初始全球位系数模型的选取提供了借鉴。     

Amplification of strong ground motion in the city of Zagreb, Croatia, estimated by computation of synthetic seismograms

A hybrid technique consisting of modal summation and subsequent finite differences modelling is applied for the computation of synthetic accelerograms along a profile crossing the city of Zagreb, the capital of Croatia. Assuming the source geometry is known, the amplification properties of the underlying soil may be determined by comparison of synthetics and their response spectra computed for a bedrock model with the ones obtained under the assumption of a realistic laterally varying local model. The peak ground acceleration is larger by a factor of up to 3.5 than the value obtained for the bedrock model. The amplification of the response spectra is most prominent for frequencies below 2 Hz, and increases sharply to the SW from the mapped fault running through the centre of the city.     

GPS网先验误差的选择与加权配置

分析了先验误差对于GPS网平差的意义 ,指出先验误差的计算及确定的一些方法 ;最后说明如何在GPS网平差中进行加权配置。     

Seismic monitoring of explosions: a method to extract information on the isotropic component of the seismic source

The design of a monitoring system for detecting explosions is a very topical problem, both for routine data processing at seismological observatories as well as for the monitoring of a Comprehensive Test Ban Treaty. In this framework it is desirable to have the possibility to quantify the presence of the isotropic component in the seismic source. For this purpose a method is presented, which is based on waveform inversion for the full moment tensor retrieval. The method inverts either full waveforms or separate seismic phases and returns the mechanism and time history of a point source. Moreover, it allows to redefine the hypocentral depth of the event and, in a simplistic way, to optimize the structural model as well. In order to model strong laterally heterogeneous structures, different pairs of structural models can be used for each source-receiver path. The source is decomposed into a volumetric part (V), representing an explosive or implosive component, and into a deviatoric part, containing both the double couple (DC) and the compensated linear vector dipole (CLVD) components. The method is applied to an area in central Switzerland and to the network of the Swiss Seismological Service. The events of interest include both earthquakes and explosions. Despite some modelling inadequacies of the source-time function, the explosions can be well identified with the inverted isotropic component in the source, as long as the number of stations used for the inversion is larger than three. The results of the inversion are better for large epicenter-station distances of the order of 40–90 km.