The OASES-OASI module is very similar to OASN, modeling the seismo-acoustic field on arbitrary 3-dimensional arrays of hydrophones and geophones in the presence of surface noise sources and discrete signal sources. This module is used to model the propagation of surface-generated ambient noise and for providing simulated array responses as well as signal replicas for matched field environmental inversion using OASES-MFP. OASI and MFP were used to generate the inversion and resolution results shown in Fig.4 of Ref.[23].