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.

本数据集包含两个连续野外作业季采集的、覆盖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，配套存储GPS位置信息的DZG文件，采集区域为裂缝发育极强的麦克默多剪切带（McMurdo Shear Zone）。本次探地雷达勘测采用的系统由GSSI SIR-30型32位双通道控制单元，以及型号5103“400 MHz”、型号5106A“200 MHz”天线单元组成。该雷达系统搭载于雪橇之上，由机器人牵引。机器人沿间距50米的测线，以自西向东往返的方式完成了5×5.7平方千米区域的勘测。2014年的勘测作业时间为2014年10月29日至11月9日，2015年的勘测作业时间为2015年10月26日至11月1日。两年均采用固定航点的欧拉采样方案：GPS采样点位保持固定，但冰体在两次年度勘测之间会发生位移。2014年，400 MHz天线的探测深度为19米；2015年为探究冰内冰层特征，将400 MHz天线的探测深度提升至80米。两年的200 MHz天线探测深度均为160米。