The OASES-OASN module models 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 to the array processing module OASES-MFP described later. The SAFARI predecessor of OASN was used for the noise propagation study in Ref. [12] and for computing covariance matrices and replicas for the matched field processing study in Ref. [13].