COLLABORATIVE RESEARCH: Investigation of the Kinematics of Brittle Deformation through Patterns of Seismic P&T Axes and Fault Slickenlines using Micropolar Theory

合作研究：通过地震波模式研究脆性变形的运动学

• 批准号: 9526105
• 负责人: Jeffrey Unruh
• 金额: --
• 依托单位: William Lettis & Associates Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-02-15 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526105&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Investigation; Kinematics; Brittle

; R o o t E n t r y F ; C o m p O b j b W o r d D o c u m e n t O b j e c t P o o l ; ; 4 @ % & ' ( ) * + , - . / F Microsoft Word 6.0 Document MSWordDoc Word.Document.6 ; 9526105 Unruh This is a collaborative project to continue investigation of the application of micropolar continuum theory to the analysis of brittle deformation. This research consists of theoretical and applied elements, both of which have significant implications for the study of active tectonics. Seismic events and slickenlines on fault surfaces are manifestations of slip on shear planes that occurs in the brittle part of the Earth s crust. The slip accommodates a specific geometry of deformation of defined by the orientation of the fault and the direction of slip. The set of all such shearing events in a given volume accommodates the brittle deformation of that volume. If we assume that this brittle deformation is an accurate reflection of the tectonic deformation imposed, that we can invert the seismic focal mechanism data or the shear plane/slickenline data to determine the geometry of the tectonic deformation. The inversion of such data requires a deformation model that one fits to the observations. The micropolar model of deformation is a continuum model that includes the effects o f the rotation of rigid fault blocks on the slip directions in any given shear plane, which other deformation models do not include. Thus, using this model permits the extraction of more kinematic detail from the data than other inversion techniques provide. ; Oh +' 0 $ H l D h R:\WWUSER\TEMPLATE\NORMAL.DOT S u m m a r y I n f o r m a t i o n ( $ 9526105 Felicia Smith Felicia Smith @ |( @ @ |( @ Microsoft Word 6.0 1 ; e = e a a j j j j j j j P 1 Õ 2 T ? 5 P j P j j j j Õ ~ j j j j Õ = 9526105 Unruh This is a collaborative project to continue investigation of the application of micropolar continuum theory to the analysis of brittle deformation. This research consists of theoretical and applied elements, both of which have significant implications for the study of active tectonics. Seismic events and slickenlines on fault surfaces are manifestations of slip on shear planes that occurs in the brittle part of the Earth s crust. The slip accommodates a specific geometry of deformation of defined by the orientation of the fault and the direction of slip. The set of all such shearing events in a given volume accommodates the brittle deformation of that volume. If we assume that this brittle deformation is an accurate reflection of the tectonic deformation imposed, that we can invert the seismic focal mechanism data or the shear plane/slickenline data to determine the geometry of the tectonic deformation. The inversion of such data requires a deformation model that one fits to the observations. The micropolar model of deformation is a continuum model that includes the effects of the rotation of rigid fault blocks on the slip directions in any given shear plane, which other deformation models do not include. Thus, using this model permits the extraction of more kinematic detail from the data than other inversion techniques provide.

; r o o o o t e n t r y f; C O M P O B J B J B J B J B W O R D D O C U M E N T O B J E C T P O O L; ; 4 @％＆'（） * +， - 。 / f Microsoft Word 6.0文档mworddoc Word.document.6; 9526105 Unruh这是一个协作项目，旨在继续投资于微极持续理论在脆性变形分析中的应用。这项研究由理论和应用元素组成，两者都对主动构造学的研究具有重要意义。断层表面上的地震事件和光滑线是在地球脆弱部分发生的剪切平面上滑动的表现。滑动适应由断层和滑动方向定义的特定变形的特定几何形状。给定音量中所有此类剪切事件的集合可容纳该体积的脆性变形。如果我们假设这种脆性变形是施加的构造变形的准确反映，那么我们可以颠倒地震局灶性机理数据或剪切平面/滑素数据以确定构造变形的几何形状。此类数据的反转需要一个适合观测值的变形模型。变形的微极模型是一个连续模型，其中包括在任何给定的剪切平面上刚性断层块在滑动方向上旋转的影响，其他变形模型不包括。这样，使用此模型允许从数据中提取更多的运动细节，而不是其他反演技术。 ; Oh +' 0 $ H l D h R:\WWUSER\TEMPLATE\NORMAL.DOT S u m a r y I n f o r m a t i o n ( $ 9526105 Felicia Smith Felicia Smith @ |( @ @ |( @ Microsoft Word 6.0 1 ; e = e a j j j j j P 1 Õ 2 T ? 5 P j P j j j j Õ ~ j j j j Õ = 9526105 Unruh这是一个合作的项目，旨在将微摩尔的应用用于脆性变形的分析，这是由理论和应用的元素组成的，这两种元素都对积极的构造事件的研究具有重要意义。如果我们假设这种脆性变形是构成构成变形的准确反射，则由给定体积的所有此类剪切事件的方向定义。此类数据的反转需要一个适合观测值的变形模型。变形的微极模型是一个连续模型，其中包括在任何给定的剪切平面上刚性断层块在滑动方向上旋转的影响，其他变形模型不包括。这样，使用此模型可以比其他反转技术从数据中提取更多的运动细节。