Tuesday, May 5th, 2:00PM
Location: Revelle 4301
Postdoctoral Scholar, Scripps Institution of Oceanography, La Jolla, CA
Active and passive source seismics in Antarctica
Seismic methods on ice are an efficient tool to investigate elastic properties of the ice, map the ice-bed interfaces, as well as structures within the bedrock and determine layer thicknesses even in the presence of water. I show results of active source seismic experiments in Dronning Maud Land, East Antarctica. As source we used classic explosions for surface seismic experiments, as well as for vertical seismic profiling. These data sets were used to investigate the anisotropy of the ice caused by an orientation of the anisotropic ice crystals. We also introduced the vibroseismic method to polar ice sheets and mapped englacial reflection horizons, the ice-bed interface and the bathymetry below the ice shelf. Further, I present a new passive source seismic experiment that was set up at the Ross Ice Shelf , West Antarctica, to continuously record data for two years. The seismometers were installed last November and I’ll show preliminary results of a two-week data set of three stations that was recorded during the deployment period. Here we investigate the impact of ocean swell and infragravity waves on the ice shelf.