Numerical Modelling of Coherent Broadband Pulses for Seismic Exploration
DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA) DARTMOUTH
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As part of the Offshore Energy Environmental Research OEERDRDC Atlantic project Feasibility of a Marine Vibroseis System to Minimize Potential Impacts of Seismic Surveying on Commercial Marine Invertebrates, DRDC Atlantic has been investigating the possibility and technical feasibility of using coherent broadband sources with complex waveforms followed by matched-filtering to replace high amplitude impulsive sources used in marine seismic surveys. This report discusses a MATLAB implementation of an acousto-elastic wavenumber algorithm for layered geoacoustic media. This code is then used to generate broadband time series for different geological configurations and incident waveforms. The relative performances of different impulsive and extended-time broadband sources are investigated. As well, the effects of the upper airwater interface and the inclusion of attenuations in the elastic layers are modelled.