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• W12603904 startingPage "219" @default.
• W12603904 abstract "The analysis of scattered teleseismic body waves has played a major role in our understanding of lithospheric and upper mantle structure. Their utility stems from the interaction of near vertically propagating wavefields with subhorizontal stratification. This property enables analysis to proceed, either explicitly or implicitly, within a single scattering context. In particular, the dominance of single scattering simplifies both of the two main processing steps undertaken prior to interpretation, that is, source deconvolution and waveform inversion. Early studies employed spectral ratios of different seismogram components to remove the source and isolate structural effects, leading to the so-called time-domain ‘receiver function’. The receiver function can be shown to be a leading order approximation of a more fundamental quantity, the Earth’s Green’s function, which possesses a greater sensitivity to subsurface material properties and is an important prerequisite to many inverse-scattering algorithms. An improved Green’s function estimate can be recovered by exploiting an approximate modal decomposition and the minimum-phase nature of the seismogram component in the incident mode. Until recently, teleseismic waveform inversions for receiver-side structure have been dominated by one-dimensional (1-D) model parameterizations. 1-D studies benefit from a modest computational burden, and a number of distinct approaches to solving the inverse problem have been described, including least-squares optimization, nonlinear directed search algorithms, and high-frequency, linearized inverse scattering. The latter approach provides a quantitative justification for empirical delay-and-sum processing schemes that have provided much early insight into crust and upper mantle discontinuity structure. With the advent of portable, broadband arrays, multidimensional studies have become increasingly common. To date, most multidimensional inversions have relied on high frequency, linearized inverse scattering for computational efficiency, although this incentive will no doubt diminish with future improvements in computational hardware. In particular, it may prove feasible to entertain fully nonlinear inverse scattering that obviates many of the shortcomings of single scattering, notably the need for accurate velocity macromodels and the contaminating influence of multiple scattering interactions." @default.
• W12603904 created "2016-06-24" @default.
• W12603904 creator A5005322254 @default.
• W12603904 date "2007-01-01" @default.
• W12603904 modified "2023-09-27" @default.
• W12603904 title "Theory and Observations – Teleseismic Body-Wave Scattering and Receiver-Side Structure" @default.
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