Data Processing for a GPR survey of Fourcade glacier

Fourcade 빙하지역의 GPR 자료처리

  • 김기영 (강원대학교 지구물리학과) ;
  • 홍명호 (강원대학교 지구물리학과) ;
  • 이주한 (한국해양연구원 부설 극지연구소) ;
  • 홍종국 (한국해양연구원 부설 극지연구소) ;
  • 진영근 (한국해양연구원 부설 극지연구소) ;
  • 손호웅 (배재대학교 건설환경철도공학과)
  • Published : 2007.06.07

Abstract

To delineate subglacial and englacial images of the western Fourcade Glacier in Antarctica, GPR data were acquired along a 470 m profile in November 2006. Signature deconvolution, migration velocity analysis, and finite difference depth migration were effective in increasing vertical resolution, obtaining the velocity function, and yielding clear depth images of the mixed-phase single-channel data, respectively. The source signature was extracted through stacking reflection signals from the basement. The deconvolution successfully compressed the source signatures to increase temporal resolution and attenuated reverberations. Medium velocities were analyzed with 112 diffraction events by the constant-velocity migration method based on the Stolt algorithm. Finally, depth migration based on the finite difference algorithm provided clear englacial and subglacial images in the laterally-varying velocity field.