Novel depiction of love wave dispersion and inversion for inversely dispersive medium by full SH-wavefield reflectivity method – part II: field example

Abstract

In this part we discussed field example of SH wave data recorded using horizontal component of the three-component geophone that might represent characteristic of the inversely dispersive medium. Extraction of the SH wavefield data, both for north- and south-source impact, using tau-pi transform showed increasing phase-velocity dispersion with the frequencies. Such patterns of “effective” dispersion curves illustrated the nature of the inversely dispersive medium. Inversions of the dispersion curves were carried out by utilizing a series of Love wave inversion approaches. These approaches included forward modelling of Love wave dispersion curve by full SH-wavefield method and partial derivatives of the Love wave phase velocity. The inversion procedures utilized a linearized inversion of Occam’s algorithm. Inversions of the Love wave real data, both for north- and south-source impact, confirm the presence of an inversely dispersive medium.