Signatures of Seismic Anisotropy in Crustal Terranes: Southeastern California

地壳地震各向异性特征：加利福尼亚州东南部

• 批准号: 9980570
• 负责人: David Okaya
• 金额: $ 16万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9980570&HistoricalAwards=false
• 关键词: Signatures; Seismic; Anisotropy; Crustal; Terranes

EAR-9980570Okaya, DavidThis project is a study to identify the types of vector wavefield signatures that may be observed in crustal refraction/reflection three-component data due to anisotropic terranes within the crust and to use these signatures to map the terrane. The study would a) employ anisotropic wave propagation theory to formulate analytical or numerical expressions of the cumulative anisotropic effects to waveforms along surface-to-surface raypaths typical of crustal scale seismic experiments; b) examine two already-existing datasets collected in regions of known anisotropic layering; c) obtain quantitative measures of uncertainties for isotropic velocity analysis of anisotropic data using synthetic data; and d) examine discriminants for separating the cases of anisotropic effects due to uniform (bulk) anisotropy, anisotropic heterogeneity, and isotropic heterogeneity within the crust. The three-component crustal refraction/reflection datasets are located in southeastern California and both are coincident with outcrops of anisotropic terranes with existing petrophysical measurements to indicate velocity anisotropy.

EAR-9980570OKAYA，DAVIDTHIS项目是一项研究，是一项研究，旨在确定由于地壳中各向异性的Terranes而在地壳折射/反射中可能观察到的矢量波场特征的类型，并使用这些签名来绘制地形。 该研究将a）采用各向异性波传播理论来制定累积各向异性效应的分析或数值表达式，沿着地表到地面的射线沿着地面尺度地震实验的典型的表面向表面射线路径进行波形； b）检查在已知各向异性分层区域收集的两个已经存在的数据集； c）使用合成数据获得各向异性数据的各向同性速度分析的不确定性定量度量； d）检查歧视因素是否分离出由于壳内均匀（散装）各向异性，各向异性异质性和各向同性异质性而导致各向异性作用的病例。 三组分的地壳折射/反射数据集位于加利福尼亚州东南部，两者都与现有的岩石物理测量值相吻合，并表明速度各向异性。