Comparing Strategies for Local FWI: FD Injection and Immersive Boundary Conditions

TL;DR

This paper compares two strategies for local Full Waveform Inversion in the time domain: one ignoring exterior interactions (FD injection) and one considering them (Immersive Boundary Conditions), to improve local geophysical modeling.

Contribution

It introduces and evaluates two novel strategies for local FWI, highlighting the importance of exterior interactions in inversion accuracy.

Findings

FD injection simplifies computations but may reduce accuracy.

Immersive Boundary Conditions improve modeling of exterior interactions.

Numerical tests demonstrate the impact of exterior interaction considerations.

Abstract

Conventional Full Waveform Inversion requires calculating the objective function to be minimized and construction a gradient using the whole property model, when is often the case where geoscientist are only interested in a local region. In this study, we use two strategies to perform local FWI in time domain. One that disregards the interaction of the locally altered model with the exterior (FD injection) and the second that can take these iterations into account (Immersive Boundary Conditions). Numerical tests show the influence of whether or not to set aside these interactions for different accuracy of the exterior model.