Research objectives and content
Seismic tomography is one of the most powerful techniques to investigate the Earth's interior, especially in that regions of plate boundaries where deep tectonic process produce strong velocity anomalies in substructure. But, in its basic form this tecnique suffers the effect involved by the inversion of a large underdetermined system of linear equations and the uncertainties involved by the solution of forward problem. Both of these problems, related to the understanding of the wave propagation in strongly etherogeneous structures like for example magmatic chamber, are still uncompletely explored by the applicants of seismic tomography. Training content(objective, benefit and expected impact)
In this project we will try to find the model parameterization which permits to have both a very efficient 3-D ray tracing and accurate calculation of ray-theoretical amplitudes as well as a flexibility in local resolving power of the parameter grid. Increasing the region sensitive to the delay of one particular ray and adding constrains based on a physical model, the inverse problem can subsequently be optimized by tailoring the 3-D parameterization in such a way that the posteriori covariance of the model becames more homogeneous. The result will be a new fexible code that will be applied to the seismic data of the Tomoves 96 experiment for a tomographic reconstruction of the Vesuvius structure.