地震发生时间的概率预报（一）

概率预报的基本思想是利用地震历史中表现出来的统计规律去推测未来。在一定概率意义下,给出下次地震可能发生的时间界限,或是在指定时间内,给出地震发生的概率,对于研究地震区域划分,提供抗震烈度等问题都是有一定意义的。这里仅从地震序列本身提取预报信息,没有考虑发震时间与各种前兆观测的关系,也没有考虑时间与地点和强度的相关。     

震源孕育模式的初步讨论

一、前言 地震发生时的模式,人们在震源机制研究中,已讨论很多了,而地震孕育模式则讨论很少。地震孕育模式直接关系着地震预报工作,所以本文想就这个问题作一些讨论。由于问题比较复杂,讨论仅限于单一断层带。构造交会区,有待以后探讨。     

矿山坑道內无线电波透視矿体的試驗

一、引言无线电波在地球物理探测中的应用,最早的一次试验是由A.A.彼特罗夫斯基于1928年在苏联外高加索某一硫化矿床上进行的,而且得到了由硫化矿体所引起的无线电波“阴影”。     

利用卫星测高数据推求中国近海及邻域大地水准面起伏和重力异常研究水

首先对中国近海及邻域（0°-40°N,105°─135°E）内4年的T／P卫星测高数据（1992－10-03-1996－10－09）和1年多的ERS－1卫星测高数据（1992－10－23-1994－01－20）进行了预处理以剔除数据中的粗差影响．然后,对卫星的重复轨迹采用"共线"处理方法得到该海域的平均海平面．在扣除海面地形的影响后得到该海域30'×X30'大地水准面起伏。再分别采用Stokes公式逆运算加FFT技术和最小二乘配置法恢复出该海域30'×30'海洋重力异常．所得到的海洋大地水准面起伏精度为8．5cm,恢复出的重力异常的精度为35×10－5m／s2．     

Notes on the Triassic Formations and Faunas of the Yuan-an District,Western Hupeh

INTRODUCTION More than a decade has elapsed since the illuminating study of J.S.Lee and Y.T.Chao~1 on the geology of the Yangtze Gorges.The puplica-tion of C.Y.Hsieh and Y.T.Chao's Memoir~2 dated only two years later.So the necessity of restudying this critical region in the light of the     

A Third Note on the Statigraphical Unconformities in Kuangsi

正 As stratigraphical data regarding breaks between the Triassic formations have accumulated as a consequence of recent research in the southern and western parts of Kuangsi, the appearance of a third note on the stratigraphical unconformities in this province to supplement previous papers on the sub     

On the Occurrence of Triassic Fauna in the Pemo-Trlassic Succession of Leiyanghsien,South Hunan

The valley of the Leiho in South Hunan has long been famous for itsnumerous coal-fields.It was Ferdinand von Richthofen~1 who first studiedthe geology of the region and discovered the well-known Gigantopterisflora in the coal measures,which was named by him the Lui-Pa-Kou     

Mesozoic Orogenic Movements in the Finghsiang Coalfield, Kiangsi

The Pinghsiang coalfield of Kiangsi province has been repeatedlyvisited by Chinese as well as by foreign geologists most of whom howeverspent much of their time in determining the economic value of the coalfieldand consequently very little attention was paid to the stratigraphic and     

Numerical Model of Internal Solitary Wave Evolution on Impermeable Variable Seabed in A Stratified Two-Layer Fluid System

1.IntroductionIn mathematics and physics,a soliton is a self-reinforcing solitary wave caused by nonlinear ef-fectsinthe medium.Solitons are found in many physical phenomena(Chou and Shih,1996;Chouand Quyang,1999;Chouet al.,2003;Chenet al.,2004;Wang,2004;…     

On the Range of Validity and Accuracy of Boussinesq-Type Models

In this paper the range of validity and comparison of accuracy of three Boussinesq-type models (Madsen and Sφrensen, 1992; Nwogu, 1993; Wei et al., 1995; referred to as MS, NW and WKGS, respectively) are analyzed and discussed. The governing equations are extended to the second-order approximations to keep higher-order nonlinear terms. Two key parameters ε and μ representing wave nonlinear and frequency dispersive properties are used to demarcate the limit of applicability for these three models. The accuracy of predictions by each model is compared by the relative errors with and without hlgher-order nonlinear terms in Boussinesq equations. A numerical model is developed based on one-dimensional Boussinesq equations and applied to the case of waves propagating over a submerged bar. The performance and feasibility of each model are tested against laboratory data.