8 July, 2000
July 8, 2000
Today was a slow day. We finished drilling at this site yesterday, and gathered borehole video data. All three boreholes have been instrumented with pressure transducers that will monitor the rise and fall of water in the holes. We hiked out to look for our next drilling location - about half a kilometer further away from Hidden Creek Lake. A helicopter will arrive on the 10th (Monday) to lift our camping and drilling equipment out to the new location.
The cracking sounds that continue near our camp are beginning to manifest themselves as surface fractures in thee ice. A crack began opening near our second and third borehole a day ago. It is now a couple of inches wide and is extending as a series of left-stepping fractures toward our camp. These series of cracks was also headed straight for the tent of PI Andrew Fountain. He picked up and moved his tent well away from this growing feature. These fractures are developing as a result of the ice dam being lifted and cantilevered by the rising water of the lake. They show both lateral and vertical displacement. They are interesting because they are the result of a primary compression force and not the tension forces that typically lead to crevasse opening. A few days ago the cracking sounds were a bit unnerving. I seem to have gotten used to them.
After inspecting the operation of the hot water drill (which he designed and built), and spending a couple of days with us, University of Wyoming glaciologist Neil Humphrey and his friend Sue Child left our camp this morning. What I will remember about Neil is that he can fix anything, and further, fixing stuff is his passion. He especially likes the challenge when the appropriate spare part is not available. He spent a bunch of time talking on the radio with PI Joe Walder at the lake yesterday. Joe was having problems with some of his transducers and data loggers. Whatever Neil suggested to change seems to have helped. The borehole camera was damaged in a manner that I thought was irreparable. Neil did not fix it, but he improvised some spare parts out of O-rings and grease and returned it to an operable condition so that it can be used for the rest of the project. His friend Sue broke the frames of her glasses. He fixed them. The only thing that he could not fix, try as he might, was our mechanical butane fire starter that we use to light our stove.
Surveyor Dennis Trabant (U.S. Geological Survey, Fairbanks) is on the bluff overlooking the lake and ice dam. Every four hours he surveys the position of the 30 reflectors he put on the ice dam. He is also using his surveying equipment to monitor the surface of the lake. It is still rising - it rose 2 feet today.
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