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Boundary shape waveform inversion for estimating the depth of threedimensional basin structures
https://niedrepo.bosai.go.jp/records/5316
https://niedrepo.bosai.go.jp/records/5316f7168e11fde94659a7306274c53f9f7c
Item type  researchmap(1)  

公開日  20230330  
タイトル  
言語  en  
タイトル  Boundary shape waveform inversion for estimating the depth of threedimensional basin structures  
言語  
言語  eng  
著者 
S Aoi
× S Aoi


抄録  
内容記述タイプ  Other  
内容記述  I propose a waveform inversion scheme that estimates threedimensional basin structure, in particular, the depth of the boundary between sediment and bedrock. This study is an extension of the boundary shape waveform inversion scheme (Aoi et al., 1995, 1997) to a threedimensional structure. The idea is to directly parameterize the basin topography and invert it by using longperiod strong ground motions including basininduced waves and direct waves. The depth of the topography is represented by a series of model parameters and basis functions that are rectangular (boxcar) functions. By this choice of basis functions, the inversion determines the average depth of the bedrock inside rectangles with the constraint that the observation equation, which is nonlinear in the model parameters, be satisfied best in the sense of least squares. The observation equation is linearized by omitting higherorder terms and is solved iteratively by singular value decomposition. To solve this equation, sensitivity functions (differential seismograms) are required, as well as the synthetic waveforms themselves. In this study, the finitedifference method (FDM) is used to calculate waveforms. Sensitivity functions are obtained numerically by taking the difference of waveforms from perturbed and unperturbed models. The positions of the discontinuity of the medium are required to lie on, not between, the finitedifference (FD) grid points to maintain the accuracy of FD calculation. The basis functions having rectangular domain are chosen to overcome this limitation. Since the basis functions take a constant value in a particular rectangle, inside the rectangle the perturbed model is just one grid deeper than the unperturbed model. The inverted correction values of the parameters for each iteration are rounded to the nearest multiple of the grid spacing of the FD calculation. I show the formulation of the proposed scheme and demonstrate its validity by performing a numerical experiment.  
言語  en  
書誌情報 
en : BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 巻 92, 号 6, p. 24102418 

出版者  
言語  en  
出版者  SEISMOLOGICAL SOC AMER  
ISSN  
収録物識別子タイプ  ISSN  
収録物識別子  00371106  
DOI  
関連識別子  10.1785/0120010245 