Abstract
The adjoint method may be designed to perform the direct optimization of tsunami fault parameters, from tide-gauge data, leading to a substantial enhancement of the signal-to-noise ratio, when compared with the classical technique based on Green's functions of the linear long-wave model. A 4-step inversion procedure, which can be fully automated, consists (i) in the source area delimitation, (ii) adjoint optimization of the initial sea state in the grid space, (iii) non-linear adjustment of the fault model and (iv) final adjoint optimization in the fault parameter space. Results with an idealized bathymetry show that the method works well in the presence of reasonable amounts of error and provides, as a by-product, a resolution matrix that contains information on the inversion error, identifying the combinations of source parameters that are best and worst resolved by the inversion. A detailed analysis of inversion sensitivity and of the fine structure of the inversion error is used to identify problems and limitations of the inversion procedure.
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Pires, C., Miranda, P.M.A. (2005). Adjoint Inversion of the Source Parameters of Near-Shore Tsunamigenic Earthquakes. In: Satake, K. (eds) Tsunamis. Advances in Natural and Technological Hazards Research, vol 23. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3331-1_15
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DOI: https://doi.org/10.1007/1-4020-3331-1_15
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