面向地震层析成像数据库的设计方法

本文概述了面向象数据库的特点，及与传统数据库的区别。结合面向地震层析成像数据库的设计，具体描述了定义地震事件对象、、地震震相和地震台站对象，确定属性，操作和类的方法。最后，讨论了用Ｆｏｘｐｒｏ２．５ｆｏｒ Ｗｉｎｄｏｗｓ实现面向地震层析成像数据库的一些特征。     

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     

Identification of Strong Earthquake Sites in Hebei Region by Making Use of Cluster Method

The Cluster and Hamming methods are used in this paper for a comprehensive study on geology,geomorphology,geophysical field,crustal deformation,active faults,regional stress axes and their relation in Hebei region.Fourteen potential seismic zones in which shocks with M≥6 may happen have been identified.Shocks with M≥6 have occurred in seven of them,and the others have been considered as a future strong earthquake areas.Both the K value and testing of deleting nodes show the stability of results obtained in this paper.The potential seismic zones identified in the paper fall into the areas of marked risk areas within 10 years in North China,but the scale of the identified zones is smaller.The Datong-Yanggao earthquake with M-6.1 occurred in October 1989 precisely in the 14th potential seismic zone mentioned above.     

Some Considerations on Earthquake Prediction Decision Process

A theory on information prediction process proposed by Weng Wenpo(1991)is applied to the earthquake prediction decision process.Four cycles represent the theory(conception),earthquake prediction decision result,anomalies,and earthquake assemblage,respectively.The interception and overlapping of the four cycles indicate different combinations,resulting in formation of 13 regions.In the case of decision conclusion on earthquake to occur,seven decision results of different characters are distinguished.The six other results were obtained in the case of absence of decision.Results of four characters show correct decision on earthquake to occur and those of three characters show the erroneous decision on earthquake to occur.Until now,theories of earthquake prediction have been incomplete,and the coincidence ratio of decision on earthquake to occur is also considerably low.Systematic analysis of the decision process is beneficial to understanding the causes for missing,virtual,pseudo,false,and correct earthqua     

Calibration Functions of Local Magnitude ML in China

On the basis of the local magnitude scale for earthquakes in China and using the data observed by main regional networks in China from 1985 to 1986,the regional calibration functions RLE(△)(suitable for Eastern China)and RLW(△)(suitable for Western China)are established through the statistic analysis of magnitude residuals and study of the average attenuation shape of the maximal phase of near shocks,and the regions in which they apply are defined.For Eastern China,For Western China,     

Substructure Method of Three-Dimensional Semi-Analytic Boundary Element and Its Application to Seismic Scattering of Hill Topography

In this paper,a substructure method of three-dimensional semi-analytic boundary element is established.The seismic scattering by three-dimensional topography of a hill can be analyzed by the method in frequency domain.Using this method,the computational effort and storage space are reduced considerably.Finally,analytic results are given.     

Abnormal Variation of H2, Hg and Other Fault Soil Gases Before Earthquake

By observing the variation of fault soil gases,we can understand the activity of faults and information on earthquake precursors.Two fault soil gas observation spots were set up at the Xiadian fault east of Beijing and at the Houhaoyao geothermal area in Huailai(Hebei Province)during November-December 1989.Concentrations of fault soil gases H2,Ar,CO2,CH4,Hg,etc.were observed.Before several moderate-strong earthquakes in 1990,the concentrations of fault soil gases such as H2 and Hg all showed abnormal variations quite significantly.In this paper,we mainly discuss the relation of these fault soil gases to earthquake activity.     

第27届IASPEI大会概况及其主要专题讨论会和研讨会内容汇编

国际地震学与地球内部物理学协会（ＬＡＳＰＥＩ）第２７届大会于１９９４年元月１０－２１日在新西兰首都惠灵顿的惠灵顿维多利亚大学举行。来自４２个国家的４８３位科学家参加了这次大会。国家地震局派出了以副局长陈为团长的１３人代表团出席会议。本届大会共安排了２７个学术报告会和研讨会，会上宣读论文和报告３９９篇，张贴展示论文约１６０篇。本届ＩＡＳＰＥＩ大会的学术报告会和研讨会涉及广泛的地震学和地球内部物理学研究的前沿问题，内容包括：波在非均匀介质中的传播；地震危险性与地震危害；亚太地区的沉积盆地及其构造背景；地球深部间断面的构造形态和动力学；地震预测；地震层析成像和地幔动力学；俯冲带和弧后盆地；地热在下地壳、岩石学与流变学等方面之作用；区域地震的定位和定量化；毫赫与毫微赫地震学；脊区的地震学详细研究；太平洋的地震和海啸危险性；大小尺度的各向异性；全球地震观测技术的改进；地震的震源模拟和断层力学；诱发地震；非线性地震学；地震运动的地面地质效应；空间大地测量学和实时构造地质学；热流和热液循环；宽频带地震学和震源，等等。     

从柯里奥利力效应讨论今后兰州地区发生强震时其强余震的情况

本文介绍了利用柯里奥利力效应判别余震的方法。据此对兰州地区将来发生强震时的余震类型作了预测。