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Waveform inversion of shallow seismic refraction data using hybrid heuristic search method  

Takekoshi, Mika (The Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology)
Yamanaka, Hiroaki (The Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology)
Publication Information
Geophysics and Geophysical Exploration / v.12, no.1, 2009 , pp. 99-104 More about this Journal
Abstract
We propose a waveform inversion method for SH-wave data obtained in a shallow seismic refraction survey, to determine a 2D inhomogeneous S-wave profile of shallow soils. In this method, a 2.5D equation is used to simulate SH-wave propagation in 2D media. The equation is solved with the staggered grid finite-difference approximation to the 4th-order in space and 2nd-order in time, to compute a synthetic wave. The misfit, defined using differences between calculated and observed waveforms, is minimised with a hybrid heuristic search method. We parameterise a 2D subsurface structural model with blocks with different depth boundaries, and S-wave velocities in each block. Numerical experiments were conducted using synthetic SH-wave data with white noise for a model having a blind layer and irregular interfaces. We could reconstruct a structure including a blind layer with reasonable computation time from surface seismic refraction data.
Keywords
generic algorithm; heuristic search method; seismic refraction data; simulated annealing; waveform inversion;
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