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，David 该项目旨在识别由于地壳内各向异性地体而在地壳折射/反射三分量数据中可能观察到的矢量波场特征类型，并使用这些特征来绘制地体地图。 该研究将a）采用各向异性波传播理论来制定对沿地壳尺度地震实验典型的地对地射线路径的波形的累积各向异性效应的解析或数值表达式； b) 检查在已知各向异性分层区域收集的两个现有数据集； 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的定量测量； d) 检查判别式，用于区分由于地壳内的均匀（整体）各向异性、各向异性异质性和各向同性异质性引起的各向异性效应的情况。 三分量地壳折射/反射数据集位于加利福尼亚州东南部，两者都与各向异性地体的露头一致，现有的岩石物理测量表明速度各向异性。