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SUMMARY:Seismic survey considerations in glaciology - Coen Hodstede (Alfre
 d Wegener Institute)
DTSTART:20150225T163000Z
DTEND:20150225T173000Z
UID:TALK57895@talks.cam.ac.uk
CONTACT:Poul Christoffersen
DESCRIPTION:Seismic surveying of glaciers give both englacial and subglaci
 al physical information and is as such an important tool in glaciology. In
  comparison with the collection of radar data\, mainly performed from airb
 orne platforms\, seismic data acquisition is a time consuming process prac
 ticed in small survey areas and used less frequent. Over the last six year
 s\, Alfred Wegener Institute developed an effective strategy to collect se
 ismic data on glaciers\, ice sheets and ice shelves\, at a high production
  rate with a small team (three to five persons) at relatively little effor
 t. The survey areas varied from a 4500m high Alpine saddle to several hund
 reds of kilometers long transects on the Antarctic ice sheet and adjacent 
 ice shelf. Each survey area has its own possibilities and limitations in t
 he survey set-up. I will reflect upon the hardware\, methods\, advantages 
 and shortcomings of the performed surveys and will discuss some results. I
 n particular I will focus on the results of two seismic surveys performed 
 in the ablation zone on the West coast of the Greenland Ice Sheet. The mai
 n objective here was to characterize the subglacial conditions of the glac
 ier. One site was Russell glacier where ice terminates on land\, a second 
 site was Store Glacier\, a tidewater glacier in Uummannaq Fjord. In both a
 reas the subglacial hydrology probably plays a key role in the ice dynamic
 s as ice velocities pick up in summer.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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