Seismic and radar investigations of Fourcade Glacier on King George Island, Antarctica

Polar research

Howong Shon¹  Ki Young Kim²  Joohan Lee³  Jong Kuk Hong³  Young Keun Jin³  Myung Ho Hong³ 

[1] Department of Civil, Environmental and Railroad Engineering, Pai Chai University, Daejon 302-735, Korea;Department of Geophysics, Kangwon National University, Chunchon 200-701, KoreaCorrespondence;Korea Polar Research Institute, PO Box 32, Incheon 406-840, Korea

关键词: Bulk density;    cold/warm ice interfaces;    elastic properties;    fracture;    seismic;    radar.;   

DOI  :  10.3402/polar.v29i3.6082

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

To determine P- and S-wave velocities, elastic properties and subglacial topography of the polythermal Fourcade Glacier, surface seismic and radar surveys were conducted along a 470-m profile in November 2006. P- and S-wave velocity structures were determined by travel-time tomography and inversion of Rayleigh wave dispersion curves, respectively. The average P- and S-wave velocities of ice are 3466 and 1839 m s-1, respectively. Radar velocities were obtained by migration velocity analysis of 112 diffraction events. An estimate of 920 kg m-3 for the bulk density of wet ice corresponds to water contents of 5.1 and 3.2%, which were derived from the average P-wave and radar velocities, respectively. Using this density and the average P- and S-wave velocities, we estimate that the corresponding incompressibility and rigidity of the ice are 6.925 and 3.119 GPa, respectively. Synergistic interpretation of the radar profile and P- and S-wave velocities indicates the presence of a fracture zone above a subglacial...

【 授权许可】

CC BY-NC