Joint Inversion of Multimode Love Wave Dispersion Curves for Accurately Appraising of Shear Wave Velocity Reversal Profile

Hamimu, La; Nordin, M. Nawawi M.; Safani, Jamhir
July 2010
AIP Conference Proceedings;7/7/2010, Vol. 1250 Issue 1, p245
Conference Proceeding
The use of multimode dispersion curves (DCs) in surface wave inversion to derive shear wave velocity (VS) profiles has increased in the past decade as the inclusion of higher mode data can improve the accuracy of the inversion results. This paper presents a joint inversion codes to invert multimode Love wave (fundamental plus higher modes) DCs and focuses on the attempt to improve the accurate appraisal of the VS reversal profile. The multimode Love wave DCs were synthesized using full SH (Shear Horizontal) waveform reflectivity as the true model. In this study, we used a frequency-slowness (f-p) transform to extract DC from full SH waveform reflectivity. DCs overlain in the dispersion images were picked manually. The DCs were then inverted using modified genetic algorithm (GA). Our numerical modeling showed that, the joint inversion of multimode Love wave DCs can significantly improve the accurate assessment of VS reversal profiles.


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