GPR images of hidden crevasses in Antarctica

Steven A. Arcone; Allan J. Delaney

doi:10.1117/12.383512

27 April 2000 GPR images of hidden crevasses in Antarctica

Steven A. Arcone, Allan J. Delaney

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383512
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

Abstract

We have used airborne and ground-based GPR at 400 - 500 MHz to image hidden crevasses in Antarctica. The radar antennas were either pushed in front of a snowmobile, or cantilevered from a helicopter flying at about 6 m altitude and speeds near 15 m/s. We used a high trace acquisition rate, long time ranges, and migration to show snow bridge depth, crevasse width, septums between crevasses, connecting cavities and associated folded strata in the ground-based profiles. The crevasse images are formed by the discontinuities in reflections from the stratified firn. Diffractions from crevasse walls are strongly single-sided, originate from point and linear discontinuities, and provide advance warning. Airborne recorded images are similar, but less detailed than surface images. An increased trace rate could improve airborne imaging and allow greater profile speeds.

Citation Download Citation

Steven A. Arcone and Allan J. Delaney "GPR images of hidden crevasses in Antarctica", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383512

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