Seismic network 1D:Temporary installation of 13 sensors (3C fairfield nodes) on Argentière Glacier and near Col des Grands Motets in the Mont Blanc massif (RESIF-SISMOB)

We have installed 13 seismometers on glaciers in the Mont-Blanc massif. One antenna of 5 sensors was located at the Col des Grands Montets, with a distance of about 100 m between sensors. Two others antennas of 4 sensors were installed on Argentière glacier at an elevation of 2550 m and 2700 m. These sensors were in acquisition for a little more than one month, between 2019/12/5 and 2020/1/8. The goal of this experiment was to detect low frequency icequakes associated with glacier basal sliding. Such events occur mainly after snowfall. As expected, we have detected and located several thousands of low frequency (about 5 Hz) icequakes,manly following the largest snow-fall episode of 2019/12/22-23. We have also detected hundreds of local earthquakes, occurring within the Courmayeur and Chamonix swarms. These events were useful to check the sensors orientation and correct the clock drift. Indeed, the GPS of the sensors were not in acquisition, except when the sensors were started in Chamonix on 2019/12/4.