Phase shift migration for imaging layered materials and objects immersed in water

This paper proposes the use of phase shift migration for imaging layered structures and objects immersed in water. The method that was developed in reflection seismology is a frequency domain technique that in a computationally efficient way restores images of objects that are homogeneous in the lateral direction but inhomogeneous in depth. The performance of the proposed method was evaluated using immersion test data from a block with side drilled holes with an additional scatterer residing in water, in this way investigating the method´s capability of simultaneously imaging scatterers in different media and at different depths. The method was also applied to a copper block with flat bottom holes. The results altogether verify that the proposed method is capable of producing high resolution and low noise images for layered or immersed objects.