Wave-equation Qs Inversion of Skeletonized Surface Waves

Jing Li, Gaurav Dutta, Gerard T. Schuster

Research output: Contribution to journalArticlepeer-review

Abstract

We present a skeletonized inversion method that inverts surface-wave data for the Qs quality factor. Similar to the inversion of dispersion curves for the S-wave velocity model, the complicated surface-wave arrivals are skeletonized as simpler data, namely the amplitude spectra of the windowed Rayleigh-wave arrivals. The optimal Qs model is the one that minimizes the difference in the peak frequencies of the predicted and observed Rayleigh wave arrivals using a gradient-based wave-equation optimization method. Solutions to the viscoelastic wave-equation are used to compute the predicted Rayleigh-wave arrivals and the misfit gradient at every iteration. This procedure, denoted as wave-equation Qs inversion (WQs), does not require the assumption of a layered model and tends to have fast and robust convergence compared to full waveform inversion (FWI). Numerical examples with synthetic and field data demonstrate that the WQs method can accurately invert for a smoothed approximation to the subsurface Qs distribution as long as the Vs model is known with sufficient accuracy.
Original languageEnglish (US)
Pages (from-to)979-991
Number of pages13
JournalGeophysical Journal International
Volume209
Issue number2
DOIs
StatePublished - Feb 8 2017

Fingerprint Dive into the research topics of 'Wave-equation Qs Inversion of Skeletonized Surface Waves'. Together they form a unique fingerprint.

Cite this