Study on the joint inversion of surface wave dispersion curves and H/V to obtain shear velocity and radial anisotropy of crust and uppermost mantle
The radial anisotropy reflects the deformation of materials and the direction of principle stress.Currently,the dispersive characteristics of Love-wave and Rayleigh-wave phase and group velocities have been widely used to determine the shear velocity and radial anisotropy of crust and uppermost mantle.However,the shear velocity and radial anisotropy of the shallow crust especially the sediments are poorly constrained in the dispersion inversion within relatively long periods(e.g.,＞5 s).Furthermore,the inverted results at deeper depths can be biased due to inaccurate shear velocity and radial anisotropy at shallow depths in dispersion inversion.Compared to surface wave dispersion,the Rayleigh-wave Horizontal-to-Vertical(H/V)ratios of particle motion are particularly sensitive to shallower shear velocity.Based on the similar spatial resolution of surface-wave phase and group velocities and H/V,we propose a method for constructing Vs profiles and radial anisotropy based on the joint inversion of the Love-wave and Rayleigh-wave dispersion curves and H/V.According to the practical case of the western Bohai Bay Basin and synthetic test,the accuracy of the shear velocity and radial anisotropy of crust,especially the sediments,is considerably improved by the joint inversion including H/V.The proposed method is beneficial to further study on the state of crustal deformation and associated tectonic stress.
Surface wave dispersionH/VJoint inversionShear velocityRadial anisotropyCrust and uppermost mantle
万方数据
维普
