Single-station ellipticity retrieval and its joint inversion with dispersion curve,for a borehole test site |
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| Authors: | Irfan Ullah Renato L Prado Mona Lisa |
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| Institution: | 1.Department of Geophysics—IAG,Sao Paulo University—USP,Sao Paulo,Brazil;2.Department of Earth Sciences,Quaid-i-Azam University,Islamabad,Pakistan |
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| Abstract: | To obtain the shear wave velocity profile for engineering application to near-subsurface, many geophysical techniques are used. The dispersion curve alone is unable to provide deeper shear wave velocity information for deep soil deposit; therefore, a joint inversion of dispersion curves with the horizontal over vertical (H/V) (i.e., apparently ellipticity) curve is recommended. The H/V curve obtained from the microtremor recording contains a major part of Love wave contribution to the noise wavefield horizontal component. Due to this presence of Love wave fraction, the H/V curve does not completely replicate the ellipticity of Rayleigh wave. In this study, we try to compare the Rayleigh wave ellipticity obtained from the borehole velocity model to the H/V curve obtained at the same locality from seismic ambient noise recording. Two different techniques available for the Love effect minimization are tested and compared with the borehole ellipticity. Finally, the joint inversion of H/V and dispersion curve is made, which shows great correspondence with the previous measurement at the site. |
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