DMO/AMO IN THE PRESENCE OF CAUSTICS

Dip MoveOut (DMO) and Azimuth MoveOut (AMO) are considered in a general framework which allows for lateral variations in the velocity model, including variations which generate caustics in the wavefield. DMO and AMO are constructed through the composition of operators in a general velocity model, using the scattering angle and azimuth parameterisation [4]. In this parameterisation, impulse responses analogous to DMO and AMO are computed in a the gas lens model presented in [5]. The results clearly show how errors can be introduced by assuming, for example, a constant velocity gradient model when the true model is laterally heterogeneous