www.spice-rtn.orgMid-Term Review Meeting, February 13-14, Tutzing

Rolf SidlerEarly Stage Researcher

Host Institution: OGS Trieste / ETH ZürichPlace of Origin: Zürich, SwitzerlandAppointment 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

Rolf SidlerEarly Stage Researcher

Host Institution: OGS Trieste / ETH ZürichPlace of Origin: Zürich, SwitzerlandAppointment 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

Seismic wave Propagation and Imaging in

Complex media: a European network

www.spice-rtn.orgMid-Term Review Meeting, February 13-14, Tutzing

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.

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.

Muijs (2005)

www.spice-rtn.orgMid-Term Review Meeting, February 13-14, Tutzing

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.

www.spice-rtn.orgMid-Term Review Meeting, February 13-14, Tutzing

OutlookGenerate 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.