Saturday, January 31, 2015

Baby borehole

January 16, 2014

Our team gets set up to start lowering the sensors into the hole
The drillers made a smaller hole, about one foot wide, for a suite of sensors that UCSC integrated for longer-term monitoring.  This is similar to the borehole instrumentation my team used last year at four different boreholes on the Whillans Ice Stream.  It took us about 6 hours to unspool the 760 meters worth of cables and lower them into the hole, taping them together as we lowered.  As we got close to the target depth, we started to monitor the temperature in real time to make sure that we got the bottom most sensors into the water cavity.   Over time, the hole creeps closed and the sensors become frozen into the ice.  This is good for us because then they will start to accurately measure ice temperature and pressure and the flexing of the ice shelf with tidal changes in sea level.

A seismometer and our sensor string are solar-powered.
Inside of the box are a nest of extra cable and a datalogger.

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