Elastic reflection-based waveform inversion with a nonlinear approach

1-D elastic waveform inversion: A divide-and-conquer approach

Subsurface rock properties are manifested in seismic records as variations in traveltimes, amplitudes, and waveforms. It is commonly acknowledged that traveltimes are sensitive to the long wavelength part of the velocity, whereas amplitudes are sensitive to the short wavelength part of the velocity. The inherent sensitivity of seismic velocity at different wavelengths suggests an approach that ...

Extended Reflection Waveform Inversion via Differential Semblance Optimization

Reflection-based waveform inversion introduces migration and demigration process to retrieve low-wavenumber component from reflection data, but both differenceand correlationbased methods suffer from the cycle-skipping problem when the time shifts change rapidly. In this abstract, we introduce model extension and differential semblance optimization into reflection-based waveform inversion. With...

Manipulating acoustic wave reflection by a nonlinear elastic metasurface

A global optimizing approach for waveform inversion of receiver functions

A global optimizing approach is developed and implemented to retrieve one-dimensional crustal structure by waveform inversion of teleseismic receiver functions. The global optimization for the inversion is performed using a Differential Evolution (DE) algorithm. This modeling approach allows the user to perturb, within a preset range of reasonable bounds, multiple parameters such as Vp, Vp/Vs, ...

Full-waveform inversion in a VTI elastic Earth: a parameterization and crosstalk study

Five parameters are needed to describe VTI anisotropy in 2-D elastic media. With conventional streamer data and considering that we have a kinematically accurate NMO velocity (vnmo) and η (or horizontal velocity, vh) obtained from tomographic methods, we first show that a parameterization given by vh, η and allows us to focus the inversion to update vh (for traveltime and amplitude fitting) and...