Monitoring the englacial fracture state using virtual-reflector seismology

Cornelis Weemstra, Delft University of Technology, Geoscience and Engineering, Delft, Netherlands; Royal Netherlands Meteorological Institute, Seismology and Acoustics, De Bilt, Netherlands, Fabian Lindner, ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, Fabian Walter, ETH Zurich, Laboratory of Hydraulics, Hydrology and Glaciology, Zurich, Switzerland and Celine Hadziioannou, Universität Hamburg, Institute for Geophysics, Hamburg, Germany