Least‐squares reverse time migration/inversion for ocean bottom data: A case study

Abstract

We present a method based on least‐squares reverse time migration/inversion (LSRTM) for imaging ocean bottom data. We show that by using LSRTM, we not only enhance the resolution of the image, suppress the migration artifacts, and more importantly, bring up the relative amplitude of true reflectors in the subsurface. This method can also be extended to image with higher‐order multiples. In certain geometry LSRTM with multiples can further improve the image with a bigger aperture. We demonstrate the concept and methodology in 2D and apply our proposed scheme to an ocean bottom field survey located in the northern Cascadia continental margin.