GPR images of hidden crevasses in Antarctica

被引:18
作者
Arcone, SA [1 ]
Delaney, AJ [1 ]
机构
[1] USA, Cold Reg Res & Engn Lab, Hanover, NH 03755 USA
来源
GPR 2000: PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON GROUND PENETRATING RADAR | 2000年 / 4084卷
关键词
radar; crevasses; Antarctica;
D O I
10.1117/12.383512
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:760 / 765
页数:4
相关论文
共 11 条
[1]   High resolution of glacial ice stratigraphy: A ground-penetrating radar study of Pegasus runway, McMurdo station, Antarctica [J].
Arcone, SA .
GEOPHYSICS, 1996, 61 (06) :1653-1663
[3]  
ARCONE SA, 1986, 866 CREEL
[4]  
CLARKE TS, 1994, ANN GLACIOL, V20, P153, DOI 10.3189/172756494794587339
[5]   THE DIELECTRIC PROPERTIES OF ICE AND SNOW AT 3.2 CENTIMETERS [J].
CUMMING, WA .
JOURNAL OF APPLIED PHYSICS, 1952, 23 (07) :768-773
[6]  
DELANEY AJ, 1996, P 27 INT S ANT LOG O
[7]  
DELANEY AJ, 1995, 957 CREEL
[8]  
GLOVER JM, 1992, 904 GEOL SURV CAN
[9]  
KOVACS A, 1982, 8239 CRREL
[10]  
MCQUILLAN R, 1979, INTRO SEISMIC INTERP