Three‐dimensional, prestack, plane wave migration of teleseismic P‐to‐S converted phases: 1. Theory

摘要: [1] We present the theoretical foundations for a prestack migration technique to image teleseismic P-to-S converted phases. The method builds on P wave deconvolution, pseudostation stacking [Neal and Pavlis, 1999] idea of using plane decomposition imaging as introduced by Treitel et al. [1982]. Deconvolution operators are constructed array aligned incident arrival times produce space-variable deconvolution operator. resulting data then muted remove deconvolved direct pulse stacked over grid feasible slowness vectors. stack interpolates field onto regular along Earth's surface producing series (one per vector) uniformly sampled three-dimensional cubes (two space variables time). components can be propagated downward form approximate ray tracing with Earth model. This yields distorted topologically equivalent original cubes. These volumes summed weighted weights derived from an integration formula inverse scattering based generalized Radon transform. allows subsurface event basis beneath array. We apply this Lodore that was deployed in northwestern Colorado. results suggest presence major lithospheric-scale discontinuity defined south dipping boundary.