Abstract
The interpretation of seismic refraction and wide angle reflection data usually involves the creation of a velocity model based on an inverse or forward modelling of the travel times of crustal and mantle phases using the ray theory approach. The modelling codes differ in terms of model parameterization, data used for modelling, regularization of the result, etc. It is helpful to know the capabilities, advantages and limitations of the code used compared to others.
Highlights
The interpretation of data from seismic refraction and wide angle reflection profiles usually involves the creation of the P-wave velocity model based on forward or automated inverse modelling of the travel times of observed crustal and mantle phases
In the case of the First Arrival Seismic Tomography (FAST) package, modelling of the Moho topography is problematic for two reasons
The model parameterization does not allow us to define velocity discontinuities which are represented in the model as zones of increased velocity gradient
Summary
The interpretation of data from seismic refraction and wide angle reflection profiles usually involves the creation of the P-wave velocity model based on forward or automated inverse modelling of the travel times of observed crustal and mantle phases. Such a model is sometimes considered as a first step, followed for example by synthetic seismogram calculations using the full-waveform method, or as a final result. The record sections show a complex character of the wavefield, the phases reflected from the Moho discontinuity, reflecting its complex topography along the profile
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