Effects of Wave Components for Near-surface Imaging

Abstract

Summary For seismic exploration, the near surface structure is very complex and varies severely. Acoustic early-arrival waveform tomography is a good method to image the near-surface velocity model. However, for land situation, geophones record vertical component of particle velocity. Normally, acoustic waveform inversion uses acoustic pressure component. Therefore, it will encounter the inconsistency of components. To test the component effect, we simulate data of acoustic vertical component of particle velocity as input instead of elastic vertical component of particle velocity. Followed by this strategy, we can eliminate the elastic effects to test the component effect. We find the component issue does impact the inversion result. For land case, acoustic waveform inversion should consider the component effect.