Crust Media Flexibility, The Electrical Anisotropy Theory And Earthquake Process, Explained That

This dissertation consists of l0 chapters, the first chapter is general illustrationand introduction, basic theories and formulas are discussed in following 5 chapters,application studies are included in the last 4 chapters. The studied contents could bedivided into 5 aspects as following:l. In chapter 1 the anisotropic phenomena and classification of earth crust media arecomprehensively discussed, from enisotropy study history and development to itstheory and method and to existing problems. On this basis the main research topicis put forward, that is combing s-wave splitting method with MT to study andexplain the dynamic anisotropic phenomena of earthquake precursors and their relations with seismic stress field development. Around the main topic, two mostimportant and creative research contents are designed: one is to set up an electricalanisotropic micro model, because before this paper there were many scalarpresentations but no any tensor model with physical meaning; the other is tocombine s-wave splitting method with MT to study anisotrpic precursors ofpractical earthquakes, this will be an creative work. The others study contens arealso arranged in chapter 1.2. The first part of study in basic theories is to derive and explain formulas ofanisotropic constitutive relations. Chapter 2 discusses anisotropic elasticconstitutive relations of various symmetry systems. Interestihg works include threeparts, (1) deriving an elastic strain energy equation to discuss constitutive relationsof various elastic symmetry systems, and to check out some errors in previouspapers. (2)deriving effective elastic constants of EDA-PTL medium; (3)derivingand numerically studying the elastic wave rays angle {dispersion phenomenon.Chapter 5 discusses electrical anisotropic constitutive relations, Creative work is toset up a new micro electrical anisotropic model and its equation. Ths model is'named as cracks directional concentrated cubic model(simply called cubicmodel). Other interesting work is to discuss PTL and EDA anisotropico behaviors inapparent resistivity and MT methods respectively.3. The second part of study in basic,theories is numerical simulation, Chapter 3 andchapter 4 study s-wave splitting of 2.5D model by pseudo-spectrum approach andthoroughly derive and analyze various boundary equations by eigenvalue method.The time delay of splitting s-waves and polarization of fast s wave are alsoanalyzed. Chapter 6 numerically simulates layered anisotropic MT models byusing and modifying previous papers equations. The purpose of these numericalsimulations is to establish a basis for following researches.4. The first part of study in application is the main topic of this dissertation, that is tostudy seismic anisotropic phenomena and the development process of stress fieldby integrating s-wave splitting method and MT approach based on EDA model.Chaper 7 is to derive equations and write computer programs which are going tobe used in following two chapters, including rotation-correlation analysis,maximum eigenvalue method, factors of wave type recognition used in s-wave 中国地震局地球物理研究所博士学位论文:地壳介质弹性,电性各向异性理论及对地震过程的联合解释 spl汕胆d吻sls。andlea幻 sqllares me山cd used In MT d扯a processmp．C帅ter 8 咖yzesandexplains selsmlcanddeCiCic幻amsotroplc precwsorsM山elr 众vd地memM山山ep rePrePmM。n毗hig尔ng砌曲叫毗e Ms 5．8。Co——d m1Ulys 22th,1995,nd heir relationsMth P axis ofe讪…e me血删m solWon．The 伽areOOlle恤RomL一u咖Langsuedopt8Iselsmograpmc sMlons毗 Songshan elemcal－m卿euc删＊．It Is discovered thatthe polariwion ofM s wave,one of＊the main elemcal axis Wthe P axis re geneally identical； the s－ 。e splittillg time delny Is Increasing ith time tmll ewtuake happens； accodingto Requencycharawn犯c ofele以nd axis n Is concluded山幻伽 drpamlc nsotroplc vanationcaused byeanllquake pfaparauon Is exeslvely distributed In certain...