Seismic Environment Class seisEnvType extSeisEnvType refinedSeisEnvType refinedExtSeisEnvType POSC 1.0 borehole The seismic data was collected in a borehole, eg. a VSP or check shot survey. land The seismic data was collected on land. marine The seismic data was collected in a marine environment. transitional Part of the seismic data was collected on land, and part was collected in a marine environment. desert The seismic data was collected on land, in a desert - an arid area. swamp The seismic data was collected in a marsh or swamp environment, characterized by standing water or soft muddy conditions. permafrost The seismic data was collected on ground underlain by permafrost unknown It is not known what environment the data was collected from.