Ground Penetrating Radar Grid Survey of the McMurdo Shear Zone

This dataset is comprised of ground penetrating radar data (GSSI DZT format with DZG files for GPS location) of a 28 square km area conduced in the heavily crevassed McMurdo Shear Zone in two consecutive field seasons. A radar system comprised of a GSSI SIR-30 32-bit two-channel control unit and model 5103 “400 MHz” and Model 5106A “200 MHz” antenna units were used to conduct the GPR surveys. The radar system was mounted on a sled and towed by a robot. The robot surveyed the 5 x 5.7 km area on lines separated by 50-m and traveled from West to East and return. The 2014 survey was conducted between Oct 29, 2014 and Nov 9, 2014, and the 2015 survey was conducted between Oct 26, 2015 and Nov 1, 2015. The use of identical waypoints in each year provides an Eulerian sampling protocol, where sampled GPS locations remain fixed, but the ice moves between annual surveys. In 2014, the 400 MHz antenna imaged to a depth of 19 meters, and in 2015, the 400 MHz antenna imaged to a depth of 80 meters to examine englacial ice. In both years, the 200 MHz antenna imaged to a depth of 160 meters.

本数据集包含采集于严重裂隙发育的麦克默多剪切带（McMurdo Shear Zone）内28平方千米区域的探地雷达（ground penetrating radar, GPR）数据，数据采用GSSI DZT格式存储，配套包含用于记录GPS定位信息的DZG文件，整体采集工作分两个连续野外季完成。本次探地雷达测绘采用的系统由GSSI SIR-30型32位双通道控制主机，以及型号5103“400 MHz”、型号5106A“200 MHz”的天线单元组成。该雷达系统搭载于雪橇之上，由机器人牵引开展测绘作业。机器人沿间隔50米的测线对5×5.7平方千米的区域进行扫描，测线方向为自西向东往复行进。2014年度测绘工作于2014年10月29日至11月9日期间开展，2015年度测绘工作则于2015年10月26日至11月1日期间完成。两年均采用完全一致的航点设置，形成欧拉采样方案——即采样的GPS定位点保持固定，但冰体在两次年度测绘的间隔区间会发生位移。2014年度使用的400 MHz天线成像深度可达19米；2015年度为探查冰内介质结构，将400 MHz天线的成像深度提升至80米。两个年度的200 MHz天线成像深度均可达160米。