Radio-Echo Sounding

The geometry of the glacier has been mapped using a 512 Hz impulse radio-echo sounding system. The radar system is contained in two small sleds and can be towed by skiers. An array of cross glacier profiles was collected with traces spaced 5 m apart. Data are processed using 2-dimensional phase-shift migration in both the along- profile and cross-profile directions. Boreholes drilled to the bed provide a check on the processing and interpretation techniques. Conclusions from this work include:

• The pseudo 3-dimensional migration technique yields a high resolution map of the glacier bed. Such a processing technique is necessary with the geometry associated with a narrow valley glacier.

Cross-glacier profile of radar traces after 3-D migration.