Delay Time Tomography in Anisotropic Media

小行星9526606 这项研究涉及到一个实用的层析成像方法的发展，同时反演非均匀性和地震各向异性，假设各向异性近似由六边形对称，并将该方法应用于现有的数据从南加州。 正演模拟计算表明，与各向异性单独的延迟时间模式是可比的延迟从典型的上地幔异质性的大小，强调包括各向异性作为一个自由参数在层析成像的重要性。 合成数据的逆建模，然后使用证明层析成像方法是可行的和稳定的。 这项工作表明，P波数据的层析分析可以用来约束各向异性随深度的变化。 这项研究是国家地震减灾计划的一个组成部分。 ***

9526606 Toomey This research involves the development of a practical tomographic method to invert teleseismic delay times simultaneously for heterogeneity and seismic anisotropy, assuming that the anisotropy is approximated by hexagonal symmetry, and to apply the method to existing data from southern California. Forward modeling calculations show that the delay time patterns associated with anisotropy alone are comparable in magnitude to delays resulting from typical upper mantle heterogeneity, underscoring the importance of including anisotropy as a free parameter in tomographic imaging. Inverse modeling of synthetic data are then used to demonstrate that a tomographic approach is feasible and stable. This work shows that a tomographic analysis of P wave data may be used to constrain variations in anisotropy with depth. This research is a component of the National Earthquake Hazard Reduction Program. ***