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DOI: 10.5445/IR/1000089310
Veröffentlicht am 11.01.2019

High-resolution characterization of near-surface structures by surface-wave inversions: From dispersion curve to full waveform

Pan, Yudi; Gao, Lingli; Bohlen, Thomas

Abstract:
Surface waves are widely used in near-surface geophysics and provide a non-invasive way to determine near-surface structures. By extracting and inverting dispersion curves to obtain local 1D S-wave velocity profiles, multichannel analysis of surface waves (MASW) has been proven as an efficient way to analyze shallow-seismic surface waves. By directly inverting the observed waveforms, full-waveform inversion (FWI) provides another feasible way to use surface waves in reconstructing near-surface structures. This paper provides a state of the art on MASW and shallow-seismic FWI, and a comparison of both methods.
A two-parameter numerical test is performed to analyze the nonlinearity of MASW and FWI, including the classical, the multiscale, the envelope-based, and the amplitude-spectrum-based FWI approaches. A checkerboard model is used to compare the resolution of MASW and FWI. These numerical examples show that classical FWI has the highest nonlinearity and resolution among these methods, while MASW has the lowest nonlinearity and resolution. The modified FWI approaches have an intermediate nonlinearity and resolution between classic ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte und Numerische Mathematik (IANM)
Sonderforschungsbereich 1173 (SFB 1173)
Geophysikalisches Institut (GPI)
Publikationstyp Forschungsbericht
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2365-662X
URN: urn:nbn:de:swb:90-893104
KITopen-ID: 1000089310
Verlag KIT, Karlsruhe
Umfang 22 S.
Serie CRC 1173 ; 2019/3
Projektinformation SFB 1173/1 (DFG, DFG KOORD, SFB 1173/1 2015)
Schlagworte multichannel analysis of surface waves, full waveform inversion, surface waves, shallow seismic, dispersion curve, shear-wave velocity
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