One Month in the Deep Field, Part 4
CHRISTCHURCH, NEW ZEALAND– In Monday’s dispatch, I described how we use passive seismometers to measure the movement of Whillians Ice Stream.
The other science component of the project is to image the subglacial lake underneath Whillans Ice Stream. To do this, we set off a series of explosions, with instruments called geophones to measure the waves emanating from the explosions. Because the waves bounce off all the layers of the subsurface, we can then figure out how deep all the layers are and eventually produce a cross-sectional map of what lies beneath the surface! Have a look at this video of the explosions.
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