江汉-洞庭盆地构造特征和地震活动的初步分析

本文根据地质、地球物理和地震等资料,初步分析了江汉-洞庭盆地构造及其演化和地震活动的基本特征。此盆地由江汉坳陷、华容隆起和洞庭湖坳陷组成,整个盆地呈现二坳一隆、多凹多凸的构造特征。盆地之下是低缓的北东向莫霍面隆起带,埋深30—31km。自早白垩世至第四纪盆地经历了裂陷、强烈裂陷和区域性沉降等复杂过程,第四纪仍存在一定程度的断裂活动和断块差异活动。盆地区有中强地震和小震活动,地震带基本位于第四纪差异活动较明显的地区和莫霍面隆起的斜坡带     

湘西江南型金矿床流体包裹的研究

流体包裹体研究表明:湘西江南型金矿床为中～低温热液矿床,成矿流体为地下热水与变质水混合而成的中等盐度、密度的弱还原性热液,成矿作用是在弱碱性条件下进行的。流体包裹体研究同时还表明:断裂构造对湘西江南型金矿床的矿化具有明显的控制作用。     

中国大陆主要强震区（带）地震危险性的灰色预测

本文根据我国大地构造背景和强震震中分布特征,划分出主要强震区(带)。通过对各区地震时间分布不均匀性的分析,划分出各区的强震集发时段。分别以各区强震集发时段的起、止时间为基本数据,运用灰色理论的基本方法,建立灰色预测模型。给出各强震区(带)本次和下次集发时段的灰色预测结果。     

Numerical evaluation of bearing capacity of a foundation in strain softening soil

The problem involving soil mass supported by a retaining wall and subjected to the load exerted by a rigid footing is considered. The collapse load of the system is determined using progressively more advanced plasticity formulations. It is demonstrated that the estimates based on elastoperfect plasticity differ very substantially from those obtained by admitting locally unstable strain softening response.     

Research on geomagnetic tectonic characteristics of the crust in Haicheng seismic area

In this paper, the two metnods, rectangular spectrum (RS) and maximum entropy power spectrum (MES), have been used in calculating the geomagnetic structures of the crust in Haicheng and its adjacent areas and carrying out the geomagnetic stratification of the crust. The result of the research indicates that the crust can be devided into such three layers as nonmagnetic layer, magnetic layer and regressive magnetic layer from the top to the bottom. It is also found the distribution of the geomagnetic bottom interface (Curie surface) is consistent with the lower interface of the upper crust and the top interface of the middle crust of the velocity structure of the crust. It is very interesting that the Haicheng earthquake of Feb. 4, 1975,M 7.3 occurred at the depth gradient belt of the Curie isotherm surface. So, to research on the geomagnetic layers and the distribution characteristics of the Curie isotherm surface is meaningful in judging potential seismic foci. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 448–454, 1993. The data of velocity and electricity materials used in this paper are as reference from the related materials of the maps and directions etc. of Donggou-Haicheng-Dong Ujimqin Qi Geoscience Transect by Prof. Zao-Xun LU, Huai-Kuan XIA and others.     

几种岛状硅酸盐矿物的形貌学研究

测量研究了锆石、黄石、石榴石、羟硅铍石和符山石的形态和微形貌，并分别列出了这些晶体的化学成分和其它鉴定参数，观察到的生长和溶蚀螺纹证实螺旋生长机制在硅酸盐矿物晶体生长中具有重要意义。     

面向对象的数据模型及其应用

本文从结构数据模型和语义数据模型的特点和关系出发,引出面向对象的数据模型(OODM)的基本概念,重点讨论了由Abiteboul和Hull提出的IFO模型,对该模型在GIS空间数据库设计中的应用进行了初步探讨,最后指出了OODM的具体实现途径。     

新构造运动对阿尔泰山及萨吾尔山山前带地下水的控制

虽山前带第四系很薄,但由于新构造运动掀斜作用及断裂的贯通作用,构造盆地第三系含水层与山前带地下水产生水力联系并获得很高的压力水头.山前带第四系厚度小的原因,是中更新世以后上升幅度增大,早中更新世沉积遭受强烈剥蚀.由于第四系很薄,曾长期被人认为地下水贫乏.但据勘探证实,较大冲积扇有丰富的潜水资源.     

余震序列分维特征的初步探讨

本文应用关联维数计算方法,分别计算了雷波5.4级地震、康定5.2级、5.8级地震和大邑6 1/4级地震的余震序列的关联维数D_2,并给出了相应的离差和相关系数。它们的关联维数分别为2.26982、1.93915、2.28738和1.5367。在这4个地震序列中,发生强余震的序列的D_2大于无强余震的序列。