Full Waveform Inversion in Laplace Domain
Seminar Room 1, Newton Institute
Seismic Full Waveform Inversion (FWI) consists in the estimation of Earth's subsurface structure based on measurements of physical fields near its surface. It is based on the minimization of an objective function measuring the difference between predicted and observed data. FWI is mostly formulated in time or Fourier domain. However FWI diverges if the starting model is far from the true model. This is consequence of the lack of low frequency in the seismic sources which limits the recovery of the large-scale structures in the velocity model. Re-formulating FWI in the Laplace domain using a logarithmic objective function introduces a fast and efficient method capable to recover long-wavelength velocity structure starting from a very simple initial solution and independent of the frequency content of the data. In this presentation we will present the FWI formulated in Laplace domain and its application to synthetic and field seismic data.