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

；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 L；；4@%&amp；‘()*+，-。/F Microsoft Word 6.0文档MSWordDoc Word.Document.6；9526105 Unruh这是一个合作项目，旨在继续研究微极连续介质理论在脆性变形分析中的应用。本研究由理论和应用两部分组成，对活动构造的研究具有重要意义。地震事件和断裂面上的滑移是发生在S地壳脆性部分的剪切面上滑动的表现。滑动适应了由断层方向和滑动方向定义的特定几何形变。给定体积中所有这类剪切事件的集合适应了该体积的脆性变形。如果我们假设这种脆性变形是构造变形的准确反映，我们就可以反演地震震源机制数据或剪切面/细线数据来确定构造变形的几何形状。这类数据的反演需要符合观测数据的形变模型。变形的微极模型是一个连续介质模型，它考虑了刚性断块旋转对任意给定剪切面内滑动方向的影响，而其他变形模型不包括这一点。因此，与其他反演技术相比，使用该模型可以从数据中提取更多的运动学细节。；哦+‘0$H L D h R：\WWUSER\TEMPLATE\NORMAL.DOT S u m a r y in f r m a t i on($9526105)Felicia Smith Felicia Smith@|(@@|(@Microsoft Word 6.0 1；e=e a a j P 1？2 T？5 P j P j’j‘=9526105 Unruh)这是一个合作项目，旨在继续研究微极连续介质理论在脆性变形分析中的应用。本研究由理论和应用两部分组成，对活动构造的研究具有重要意义。地震事件和断裂面上的滑移是发生在S地壳脆性部分的剪切面上滑动的表现。滑动适应了由断层方向和滑动方向定义的特定几何形变。给定体积中所有这类剪切事件的集合适应了该体积的脆性变形。如果我们假设这种脆性变形是构造变形的准确反映，我们就可以反演地震震源机制数据或剪切面/细线数据来确定构造变形的几何形状。这类数据的反演需要符合观测数据的形变模型。变形的微极模型是一个连续介质模型，它包括刚性断块旋转对任意给定剪切面滑动方向的影响，而其他变形模型不包括这一点。因此，与其他反演技术相比，使用该模型可以从数据中提取更多的运动学细节。

; 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.