Publication Date:
2017-04-04
Description:
We propose a two-dimensional, non-linear method for the inversion of reflected/
converted traveltimes and waveform semblance designed to obtain the location
and morphology of seismic reflectors in a lateral heterogeneous medium and in any
source-to-receiver acquisition lay-out. This method uses a scheme of non-linear optimization
for the determination of the interface parameters where the calculation of
the traveltimes is carried out using a finite-difference solver of the Eikonal equation,
assuming an a priori known background velocity model. For the search for the optimal
interface model, we used a multiscale approach and the genetic algorithm global
optimization technique. During the initial stages of inversion, we used the arrival
times of the reflection phase to retrieve the interface model that is defined by a small
number of parameters. In the successive steps, the inversion is based on the optimization
of the semblance value determined along the calculated traveltime curves. Errors
in the final model parameters and the criteria for the choice of the best-fit model
are also estimated from the shape of the semblance function in the model parameter
space. The method is tested and validated on a synthetic dataset that simulates
the acquisition of reflection data in a complex volcanic structure. This study shows
that the proposed inversion approach is a valid tool for geophysical investigations in
complex geological environments, in order to obtain the morphology and positions
of embedded discontinuities.
Description:
Published
Description:
527–540
Description:
3.8. Geofisica per l'ambiente
Description:
JCR Journal
Description:
reserved
Keywords:
non-linear method
;
reflected/ converted traveltimes
;
04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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