铲形正断层特征数值模拟及其与地震机制的研究
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摘要
铲形正断层是伸展构造区最普遍、最基本的断层构造。本文应用近年来先进的LDDA方法对断层的运动效应进行数值模拟〔1〕,着重探讨了铲形正断层的几何学和运动学特征 ,并且依据断层带附近剪应力集中的情况 ,对铲形正断层与地震机制的关系进行了讨论。这些探讨对于深入认识伸展构造区地震的形成机制和动力学环境具有重要的借鉴意义。
The listric normal fault is the most universal and typical structure in the extension area.The paper's aim is to simulate the movement effect of the fault in LDDA method,which has been advanced recently.Its importance is to study the geometry and kinematics features of the listirc fault.Acccording to the result of mathematical simulation and the shear stress concentration near the fault belts,it discusses the relation between the listric normal fault and seismic activity so as to provide the study of generation mechanism and kinematics features of the fault in the extension area with theoretical supports.
The listric normal fault is the most universal and typical structure in the extension area.The paper's aim is to simulate the movement effect of the fault in LDDA method,which has been advanced recently.Its importance is to study the geometry and kinematics features of the listirc fault.Acccording to the result of mathematical simulation and the shear stress concentration near the fault belts,it discusses the relation between the listric normal fault and seismic activity so as to provide the study of generation mechanism and kinematics features of the fault in the extension area with theoretical supports.
引文
〔1〕高文学,马瑾主编.首都圈地震地质环境与地震灾害.北京:地震出版社,1993
〔2〕滕吉文,冯炽芬,李金森等.华北平原中部地区深部构造背景及刑台地震(一).地球物理学报,1974,(4):255～271
〔3〕马宗晋.华北地区的地震地质分析.地震战线,1975,(5):24～29
〔4〕马杏垣,刘和甫,王维襄等.中国东部中、新生代裂陷作用和伸展作用.地质学报,1983,57(1):22～31
〔5〕Smith,R .B .&R .L .Bruhn.IntraplateextensionaltectonicsoftheeasternBasinandRange:inferencesonstructuralstylefromseismicreflectiondata,regionaltectonics,andthermalmathematicalmodelsofbrittle-ductiledeformation.J.G .R .,1984,Vol.89,5733～5762
〔6〕White,N .J .,J .A .Jackson&D .P .Mckenzie.Therelationshipbetweenthegeometryofnormalfaultsandthatofthesedimentarylayersintheirhangingwalls.JournalofStructuralGeology,1986,Vol.8,897～909
〔7〕Withjack,M .O .&E .T .Peterson.Predictionofnormalfaultsgeometry-asensitivityanalysis.AAPG ,1993,Vol.77,No.12,1860～1873
〔8〕陈开平.铲形正断层形成演化的动力学机制及其数值模拟.地震地质,1996,8(2):116～118
〔9〕Dula,W .F .Jr..GeometricmodelsofListricnormalfaultsandrolloverfolds.AAPGBulletin,1991,Vol.75,No.10,1609～1625
〔10〕马杏垣.重力作用与构造运动.北京:地震出版社,1989
〔11〕汪素云,JamesNi,马宗晋等.华北强震断层面解和震源深度特征.地球物理学报.1991,34(1):42～54
〔12〕Morley,C .K ..Extension,detachmentandsedimentationincontinentalrifts(withparticularreferencetoEastAfrica).Tectonics,1989,Vol.8,No.6,1175～1192
〔2〕滕吉文,冯炽芬,李金森等.华北平原中部地区深部构造背景及刑台地震(一).地球物理学报,1974,(4):255～271
〔3〕马宗晋.华北地区的地震地质分析.地震战线,1975,(5):24～29
〔4〕马杏垣,刘和甫,王维襄等.中国东部中、新生代裂陷作用和伸展作用.地质学报,1983,57(1):22～31
〔5〕Smith,R .B .&R .L .Bruhn.IntraplateextensionaltectonicsoftheeasternBasinandRange:inferencesonstructuralstylefromseismicreflectiondata,regionaltectonics,andthermalmathematicalmodelsofbrittle-ductiledeformation.J.G .R .,1984,Vol.89,5733～5762
〔6〕White,N .J .,J .A .Jackson&D .P .Mckenzie.Therelationshipbetweenthegeometryofnormalfaultsandthatofthesedimentarylayersintheirhangingwalls.JournalofStructuralGeology,1986,Vol.8,897～909
〔7〕Withjack,M .O .&E .T .Peterson.Predictionofnormalfaultsgeometry-asensitivityanalysis.AAPG ,1993,Vol.77,No.12,1860～1873
〔8〕陈开平.铲形正断层形成演化的动力学机制及其数值模拟.地震地质,1996,8(2):116～118
〔9〕Dula,W .F .Jr..GeometricmodelsofListricnormalfaultsandrolloverfolds.AAPGBulletin,1991,Vol.75,No.10,1609～1625
〔10〕马杏垣.重力作用与构造运动.北京:地震出版社,1989
〔11〕汪素云,JamesNi,马宗晋等.华北强震断层面解和震源深度特征.地球物理学报.1991,34(1):42～54
〔12〕Morley,C .K ..Extension,detachmentandsedimentationincontinentalrifts(withparticularreferencetoEastAfrica).Tectonics,1989,Vol.8,No.6,1175～1192
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