The gross features of the lithosphere-asthenosphere system in Europe from seismic surface waves and body waves     

G. F. Panza  St. Mueller  G. Calcagnile 《Pure and Applied Geophysics》1980,118(2):1209-1213

Long-period recordings of dispersive Rayleigh waves along numerous station lines, or profiles, in Europe have for the first time permitted a uniform inversion of these observations based on a new method of phase velocity regionalization.Regional dispersion relations obtained by this method have then been subjected to a complete inversion procedure commonly known as the hedgehog method. The results are presented in a map outlining the thickness of the lower lithosphere (lid) and the shear (S) velocities in both the lid and the asthenosphere channel.A comparison of these results with the minimum compressional (P) wave velocities in the asthenosphere and their corresponding depths provides an estimate of theV _p /V _s ratio for the asthenosphere in the European area.Contribution No. 314, Institute of Geophysics, ETH-Zürich, Switzerland.  相似文献   

英语地震科技文献的写作技巧     

孙青茹 《山西地震》2005,(2):44-46

根据科技英语的特点，从题名、著者、摘要、论文主体和参考文献等几方面阐述了科技文献的写作要求；从词汇、句法和修辞3个方面介绍了英语地震科技文献的写作技巧。指出，英语地震科技文献必须按有关标准和规范的要求撰写，这样才能达到出版的要求和交流的目的。  相似文献   

A visualization system for mineral elasticity     

Bijaya B. Karki  Ravi Chennamsetty 《Visual Geosciences》2004,9(1):49-57

The authors have developed an efficient visualization system to gain insight into large collections of mineral elasticity data produced by an increasing number of both theoretical calculations and experiments. The system allows us to visualize multivariate elastic moduli (i.e., elastic constant tensors) and their variation with composition, pressure and temperature. Moreover, it supports visualization of elastic wave propagation in an anisotropic medium by rendering the wave velocity data, which are calculated as a function of propagation direction in a three-dimensional space. This paper describes the design, implementation and application of the visualization scheme we have developed for mineral elasticity. In particular, our scheme exploits a combination of parallel coordinates, star plot, scatter plot and polygon-surface rendering techniques, which are implemented using OpenGL, GLUI and C++. The result is a highly portable and flexible interactive visualization system. For illustration, the elastic properties of several important oxide and silicate minerals are successfully visualized as a function of pressure and temperature.Reviewed by: D. Yuen, G. Erlebacher  相似文献   

地震学进展     

陈Yong 《地球物理学进展》1993,8(1):9-17

简要回顾了当代地震学发展的两个方面,一是利用地震波探测地球内部.包括:现代测震技术的发展、数字地震学、地震层析成象、地震勘探和地下核爆炸侦查等;二是研究天然地震的成因以及地震灾害的预测和预防,包括:考古地震学的发展,地震活动的统计特征,地震模型、中长期地震预报等.  相似文献   

某些地震学预报方法的分类及初步优选   总被引：3，自引：0，他引：3  

刁守中  华爱军  郭爱香 《内陆地震》2000,14(1):15-23

根据地震学预报方法及参数的物理意义、统计特征及相互关系,按其描述的地震现象或介质特性,将这些方法和参数分为空间结构、时间结构、震级结构、外因调制、震源及介质、综合民生参数及地震序列参数７大类。部分参数间具有相关性,不必重复使用。通过对以地震目录为基础资料的某些地震学参数算法分析及地震学意义的讨论,初步优选了相关姘变为：研究地震空间结构,可使用Ｄs、Ｑn或Ｃ值之一;研究地震时间结构,使用Ｎ、Ｄ或βn之  相似文献   

中国近代地震学史纲要     

冯锐 《中国地震》2018,34(2):172-206

随着西方科学在清朝末年的传入,中国近代地震学逐渐发展起来,可大体划分为与历史背景相关的3个阶段。1918年之前为第1阶段,辛亥革命推动了近代科学思想在中国的传播,出现了以中外传教士为主体的零散性地震研究;第2阶段以新文化运动为开端,中国科学社和专业学会出现,围绕海原地震开展了地震地质研究,取得了地震的救灾经验和深刻教训;国民政府期间为第3阶段,中央研究院和专业研究所建立,地震学进入以科研体制为依托的幼年发展阶段。其间,人员伤亡万人以上的大地震有3次,分别为1920年海原地震、1927年古浪地震和1933年叠溪地震。科学前辈们的艰苦奋斗为抗战胜利和民族独立做出了贡献。  相似文献   

广西区域数字地震台网建设与发展     

姚宏  MOU Jianying 《华南地震》2011,31(4):29-38

进入21世纪以来,广西地震观测系统得到了迅速的发展.回顾了广西数字地震台网建设的发展历史,重点介绍了“十五”期间广西各级地震台网的建设情况,阐述了广西区域数字测震台网实现与邻省、地方和企业不同属性和类别的台网联网和数据共享后,地震监测能力获得了极大的提高过程.  相似文献   

Optimisation of seismic network design: Application to a geophysical international lunar network     

Ryuhei Yamada  Philippe Lognonné  Marie Calvet 《Planetary and Space Science》2011,59(4):343-354

Fundamental scientific questions concerning the internal structure and dynamics of the Moon, and their implications on the Earth-Moon System, are driving the deployment of a new broadband seismological network on the surface of the Moon. Informations about lunar seismicity and seismic subsurface models from the Apollo missions are used as a priori information in this study to optimise the geometry of future lunar seismic networks in order to best resolve the seismic interior structure of the Moon. Deep moonquake events and simulated meteoroid impacts are the assumed seismic sources. Synthetic P and S wave arrivals computed in a radial seismic model of the Moon are the assumed seismic data. The linearised estimates of resolution and covariance of radial seismic velocity perturbations can be computed for a particular seismic network geometry. The non-linear inverse problem relating the seismic station positions to the linearised estimates of covariance and resolution of radial seismic velocity perturbations is written and solved by the Neighbourhood Algorithm. This optimisation study favours near side seismic station positions at southern latitudes in order to constrain the deep mantle structure from deep moonquake data at large epicentral distances. The addition of a far side station allows to divide by two the size of the error bar on the seismic velocity model. The monitoring of lunar impact flashes from the Earth allows to improve the radial seismic model in the top of the mantle by adding much more meteor impact data at short epicentral distances due to the high accuracy of the space/time location of these seismic sources. Such meteor impact detections may be necessary to investigate the 3D structure of the lunar crust.  相似文献   

Seismic wave propagation through material containing partially saturated cracks   总被引：2，自引：0，他引：2  

J. A. Hudson 《Geophysical Journal International》1988,92(1):33-37

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数字地震学的发展和展望     

陈祥熊 《福建地震》2003,(3)

本文简要介绍了地震观测仪器的重大变革 ,数字地震仪和模拟地震仪的联系和本质区别 ,宽频带地震学的含义 ,区域数字地震台网的任务以及数字地震学的发展的现状和应用前景。目的是供从事或将要从事数字地震学观测、分析和研究的同志参考。  相似文献