Seabed survey by VHR multichannel seismics: GEOSIS project

Abstract

Site surveys prior to the installation of offshore facilities are required to obtain shallow soil structural and geotechnical information. The French project GEOSIS was aimed at improving both geophysical and geotechnical investigation methods and at producing a valuable methodology for the intercorrelation of the results. The GEOSIS methodology for integrated soil investngation includes the following items VHR multichannel seismic survey, fine grained geotechnical boreholes (coring and in-situ tests) and vertical seismic profiling (P and S waves). This paper describes the acquisition and processing strategies and their application to a site survey in the western Mediterranean Sea (Monaco). Correlations established within the project between geophysical and geotechnical properties are discussed.