Simultaneous Determination of Velocities and Thicknesses of Layered Model with Genetic Algorithm
Date Issued
2008
Date
2008
Author(s)
Lin, Ping-Yen
Abstract
Layered velocity model is important basic information for seismology. Global search and calculus-based inversion are commonly used to determine layered models. Global search offers accurate solutions but usually takes much time calculating. On the contrary, calculus-based inversion saves time but usually comes with the local minimum problem. Genetic algorithm (GA), which has been used in many fields, probably is an appropriate method to balance between accuracy and time saving. The purpose of our research was to determine velocities and thicknesses of layered velocity model simultaneously with GA method. In this study, P phase and S phase arrivals were used. Fortran program codes were written and tested with earthquake data of Chia-Yi area, Taiwan from1991 to 2006. The results showed that the velocity models calculated by GA are strongly affected by the density distribution of earthquakes. However, with enough data, our approach balanced well between efficacy and efficiency. The results suggest that GA could be a good way to obtain reliable initial velocity models for geophysical studies.
Subjects
velocity model
genetic algorithm
chiayi
Type
thesis
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