|Least-squares reverse time migration for the Cascadia ocean-bottom dataset|
In general, pre-stack imaging of OBS acquisition is done in the common-receiver domain. For processing, the idea of reciprocity is applied, in which these common-receiver gather (CRG) are injected at the source location while the source wavelet is injected at the receiver location. We will first discuss how the migration operators are constructed. Afterwards, we will discuss how the least-squares migration problem is defined.