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Rolf Sidler Early Stage Researcher Host Institution: OGS Trieste / ETH Zürich

S eismic wave P ropagation and I maging in C omplex media: a E uropean network. Rolf Sidler Early Stage Researcher Host Institution: OGS Trieste / ETH Zürich Place of Origin: Zürich, Switzerland Appointment Time: January 2005

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Rolf Sidler Early Stage Researcher Host Institution: OGS Trieste / ETH Zürich

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  1. Seismic wave Propagation and Imaging in Complex media: a European network • Rolf Sidler • Early Stage Researcher • Host Institution: OGS Trieste / ETH Zürich • Place of Origin: Zürich, Switzerland • Appointment Time: January 2005 • Project: Impact of mushy sea-floor properties on wave-field decomposition of ocean bottom cable data. • Task Groups: TG mushy seafloor (Small Scale) • Cooperation: Universität Hamburg

  2. Project ScopeImpact of seafloor parameters on wavefield-decomposition Wavefield-decomposition works fine with synthetic data for an elastic seafloor. For measured data P-wavefields can mostly be satisfactorily decomposed, but S-wavefields often causes troubles. Muijs (2005) We establish end-member models for seafloor parameters and produce synthetic OBC data to evaluate the impact of anisotropy, attenuation, porosity and velocity gradients on the wavefield decomposition on the ocean bottom.

  3. Main Results • Created end-member models for anisotropy, attenuation and velocity gradients for sand, silt and clay sediments. • Established a test model configuration to evaluate the impact of different sea-floor parameters on the wavefield decomposition.

  4. Outlook Generate synthetic OBC datasets with end-member type seafloor models and evaluate quantitative impact on wavefield decomposition. Future work will aim at incorporating porosity in synthetic data and evaluate its impact on wavefield decomposition.

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