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 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 t O B j e c t P o o l ; ; 4 @ %（）* +，- . / F Microsoft Word 6.0文档MSWordDoc Word.Document.6 ; 9526105 Unruh这是一个继续研究微极连续理论在脆性变形分析中的应用的合作项目。这一研究包括理论和应用两个方面，对活动构造的研究具有重要意义。断层面上的地震事件和滑动线是地壳脆性部分剪切面上滑动的表现。滑动适应由断层的定向和滑动方向限定的特定变形几何形状。在一个给定的体积中的所有这样的剪切事件的集合容纳该体积的脆性变形。如果我们假设这种脆性变形是构造变形的精确反映，那么我们可以反演地震震源机制数据或剪切面/滑移线数据来确定构造变形的几何形状。这样的数据的反演需要一个变形模型，一个适合的观察。微极变形模型是一个连续体模型，它考虑了刚性断块的旋转对任意剪切面内滑动方向的影响，而其它变形模型没有考虑这一点。因此，使用该模型允许从数据中提取比其他反演技术提供的更多的运动学细节。;哦+' 0 $ H l D h R：\WWUSER\TEMPLATE\NORMAL.DOT S u m m a r y I n for 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 2 T？5 P j P j j j j j ~ j j j j = 9526105 Unruh这是一个合作项目，继续研究微极连续理论在脆性变形分析中的应用。这一研究包括理论和应用两个方面，对活动构造的研究具有重要意义。断层面上的地震事件和滑动线是地壳脆性部分剪切面上滑动的表现。滑动适应由断层的定向和滑动方向限定的特定变形几何形状。在一个给定的体积中的所有这样的剪切事件的集合容纳该体积的脆性变形。如果我们假设这种脆性变形是构造变形的精确反映，那么我们可以反演地震震源机制数据或剪切面/滑移线数据来确定构造变形的几何形状。这样的数据的反演需要一个变形模型，一个适合的观察。变形的微极模型是一个连续体模型，它包括刚性断块的旋转在任何给定的剪切面上的滑动方向的影响，其他变形模型不包括。因此，使用该模型允许从数据中提取比其他反演技术提供的更多的运动学细节。