Rayleigh Wave Dispersion Spectrum Inversion Across Scales
نویسندگان
چکیده
Traditional approaches of using dispersion curves for S-wave velocity reconstruction have limitations, principally, the 1D-layered model assumption and automatic/manual picking curves. At same time, conventional full-waveform inversion (FWI) can easily converge to a non-global minimum when applied directly complicated surface waves. Alternatively, recently introduced wave equation spectrum method avoid these by applying adjoint state on spectra observed predicted data utilizing local similarity objective function depress cycle skipping. We apply three real datasets different scales: tens meters scale active-source estimating shallow targets, kilometers ambient noise reservoir characterization continental-scale seismic array imaging crust uppermost mantle. use open from exploration crustal seismology demonstrate effectiveness method. The adapts well different-scale without any special tuning. main benefits proposed over traditional methods are that (1) it handle lateral variations; (2) avoids direct curves; (3) utilizes both fundamental higher modes Rayleigh waves, (4) be solved gradient-based optimizations. Compared 1D inversion, requires more computational cost since solving 2D/3D elastic in each iteration. A good match between also leads reasonably waveforms, though does not aim waveforms.
منابع مشابه
Rayleigh wave dispersion curve inversion via genetic algorithms and Marginal Posterior Probability Density estimation
Surface wave dispersion curve inversion is a challenging problem for linear inversion procedures due to its highly non-linear nature and to the large numbers of local minima and maxima of the objective function (multi-modality). In order to improve the reliability of the inversion results, we implemented and tested a two-step inversion scheme based on Genetic Algorithms (GAs). The proposed sche...
متن کاملPerturbational and nonperturbational inversion of Rayleigh-wave velocities
The inversion of Rayleigh-wave dispersion curves is a classic geophysical inverse problem. We have developed a set of MATLAB codes that performs forward modeling and inversion of Rayleigh-wave phase or group velocity measurements. We describe two different methods of inversion: a perturbational method based on finite elements and a nonperturbational method based on the recently developed Dix-ty...
متن کاملRayleigh-wave dispersion reveals crust-mantle decoupling beneath eastern Tibet
The Tibetan Plateau results from the collision of the Indian and Eurasian Plates during the Cenozoic, which produced at least 2,000 km of convergence. Its tectonics is dominated by an eastward extrusion of crustal material that has been explained by models implying either a mechanical decoupling between the crust and the lithosphere, or lithospheric deformation. Discriminating between these end...
متن کاملJoint Inversion of Receiver Functions and Surface-wave Dispersion
Teleseismic P-wave receiver functions and surface-wave dispersion measurements can be employed to simultaneously infer the shear-wave velocity distribution with depth in the lithosphere. Receiver functions are primarily sensitive to shear-wave velocity contrasts and vertical travel times and surface-wave dispersion measurements are sensitive to vertical shear-wave velocity averages, so that the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Surveys in Geophysics
سال: 2021
ISSN: ['1573-0956', '0169-3298']
DOI: https://doi.org/10.1007/s10712-021-09667-z