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An introduction to scattering and multiple scattering.
Continuation of the Introduction

Multiple scattering:

The secundary wavefield created by the heterogeneity is interacting with the latter heterogeneity as shown in Fig. 3. The secundary wavefield interacts with the heterogeneities several times. The first itration is single scattering, later iterations take int account multiple scattering. Usually, the scattering is iterated until we have a realistic view of the heterogeneity's impact on the wavefield.


Fig. 3: Method for surface waves in a laterally heterogeneous structure (simplified). The superposition principle is used: a horizontal layer and a secundary source can for example model here this laterally heterogeneous structure. The red arrows symbolise the iteration of scattering as it is interacting again with the medium.

The multiple scattering scheme that we have developed is a 3D method that cannot be applied to the whole wavefield, but only to surface waves.

Multiple scattering within SPICE:

Multiple scattering is an original method within the SPICE Research Training Network. It is semi analytic (and not only numerical). Multiple scattering is usually computed at one period. One of the aims of the SPICE Network is to improve multiple scattering to make it work on a large range of periods. This would allow us to make synthetic seismograms.

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Universitetet i Oslo - Institutt for geofag / SPICE 2004