00000nam 2200000za 4500 9.821385 CaOODSP 20240219183450 cr ||||||||||| 160720s2011 onc|||||o f000 0 eng d CaOODSP eng eng fre n-cn--- D68-6/236-2011E-PDF Fawcett, John A. Numerical modelling of coherent broadband pulses for seismic exploration [electronic resource] / by John Fawcett. [Ottawa] : Defence Research and Development Canada, c2011. x, 18 p. : tables, figures. Technical Memorandum ; 2011-236 "November 2011." Includes bibliographical references. As part of the Offshore Energy Environmental Research (OEER)/DRDC 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 air/water interface and the inclusion of attenuations in the elastic layers are modelled. gccst Technical reports Seismic Modelling Defence R&D Canada. Technical memorandum (Defence R&D Canada) 2011-236 (CaOODSP)9.820564 PDF 977 KB https://publications.gc.ca/collections/collection_2016/rddc-drdc/D68-6-236-2011-eng.pdf