The variations of the degree of ground resistivity anisotropy during the Tangshan earthquake

ＴｈｅｖａｒｉａｔｉｏｎｓｏｆｔｈｅｄｅｇｒｅｅｏｆｇｒｏｕｎｄｒｅｓｉｓｔｉｖｉｔｙａｎｉｓｏｔｒｏｐｙｄｕｒｉｎｇｔｈｅＴａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅＴｏｎｇ－ＥｎＭＡＯ（毛桐恩）；Ｔｉｅ－ＣｈｅｎｇＷＡＮＧ（王铁成）；Ｊｉａ－ＬｉｕＹＡＯ...     

Generation of three dimensional flow fields for statistically anisotropic heterogeneous porous media

A methodology for generating three dimensional (3D) flow fields for statistically anisotropic heterogeneous porous media is presented and demonstrated. The simulated flow fields are shown to exhibit the input spatial correlation structure and observe mass continuity. Sample flow fields are presented in the form of cross sectional slices of the 3D formation. These cross sections demonstrate visually the characteristics of subsurface flow. The method was found to be faster than traditional techniques in terms of its computational requirements. Given this method, it is possible to generate the large number of realizations of a velocity field necessary to compute high order statistics in transport problems.     

人造冰和冰芯冰蠕变和方位组构发展对比

本描述了单轴压缩蠕变实验结果。试样包括ｃ轴取向为随机分布和非随机分布的冰、人造冰和取自南极洛多姆冰帽的冰芯冰，各向同性冰芯冰和人造的最小应变率存在差别，未获得合理的解释。方位组构与应力状态相容时，各赂异性冰的最小应变率高于各向同性冰的最小应变率，随着第三应谱阶段的发展，冰芯冰和人造冰的第三应变率趋近相同的恒定值，实验后冰芯冰和人造冰ｃ轴方位组构类型相同，晶粒尺寸也接近。     

On an anisotropic attenuation law of the macroseismic intensity

An anisotropic attenuation law of the macroseismic intensity has been deduced, congruent with an anisotropic modelling of macroseismic fields. The results, obtained by analysing a set of earthquakes in Eastern Sicily and Southern Calabria, show a greater adaptability to the observed data as compared with those deduced using isotropic attenuation laws modified to take the anisotropy into account.     

Evidence for anisotropy in the super-thick sedimentary basin,Bay of Bengal

Evidence for anisotropy in the super-thick sedimentary basin under the northern Bay of Bengal is presented. Surface wave group velocity data given by Brune and Singh (1986) is better fit by an anisotropic model than an isotropic one. This lends support to the hypothesis that the mid-crustal rocks are metasediments and that the section of sediments and metasediments is more than 20 km thick.