Title :
Seabed shear-wave velocity estimation by interface-wave dispersion using different inversion methods
Author_Institution :
Dept. of Electron. & Telecommun., Norwegian Univ. of Sci. & Technol. (NTNU), Trondheim, Norway
Abstract :
This paper applies both linearized and nonlinear inversion methods to estimation of shear-wave velocity profiles using interface-wave dispersion curves extracted from multi-component ocean bottom seismic data. For the nonlinear inversion, model selection based on the Bayesian Information Criterion is carried out to determine the most appropriate parameterization for seabed shear-wave velocity profile supported by the data. Five different parameterizations for the shear-wave velocity profile are studied including models consisting of 3 to 6 uniform-velocity layers over a halfspace and a dynamic power-law model over a halfspace. The parameterization with the 4-layer over a halfspace is selected as the preferred model. The inversion results by different model parameterizations and different inversion methods are compared and discussed. The penetration depth by the nonlinear inversion with the preferred model parameterization is about 180 m down to the sediments which is larger than that by linearized inversion method.
Keywords :
seismology; Bayesian information criterion; dynamic power-law model; interface-wave dispersion; interface-wave dispersion curves; inversion methods; linearized inversion method; linearized inversion methods; multicomponent ocean bottom seismic data; nonlinear inversion; nonlinear inversion methods; parameterization; parameterizations; seabed shear-wave velocity estimation; seabed shear-wave velocity profile; shear-wave velocity profile; shear-wave velocity profiles estimation; uniform-velocity layers; Computational modeling; Data models; Dispersion; Estimation; Sea measurements; Sediments; Velocity measurement; Bayesian inversion; linearized inversion; phase-velocity dispersion; shear-wave velocity;
Conference_Titel :
OCEANS - Bergen, 2013 MTS/IEEE
Conference_Location :
Bergen
Print_ISBN :
978-1-4799-0000-8
DOI :
10.1109/OCEANS-Bergen.2013.6608010