Women and Men in Black

The Dahl-Jensen team installs a seismic station about 200 km from Summit. The station, The team digs a hole into which they place the seismometer, which is stored in the large aluminum box at center right for protection. The team installs a solar panel to charge the batteries powering the datalogger. The prevalence of black clothing seen here is merely a coincidence. Last week Danish scientists studying a swath of Greenland for seismic earthquake activity visited Summit Station for several days. The group, led by Trine Dahl-Jensen of the University of Copenhagen, installed eight seismic earthquake stations on the island in a 700 km transect that begins on the eastern coast near Scoresby Sund and ends near the ice divide (where ice flows in opposing directions) about 200 km shy of Summit.

One of Dahl-Jensen's team members arrived via an Air National Guard LC-130 ahead of the other members and prepared the seismic stations and other equipment. Then, on Monday 7 June, the other researchers flew in from Iceland via a chartered Twin Otter on skis. The group rested overnight at Summit, and then flew south to begin the installations, hopping along the ice sheet via Twin Otter and completing four stations the first day. After a good meal and a night's rest at Summit, the team installed another four stations before heading off on the next adventure. 


PI Trine Dahl-Jensen installing a seismometer, seen here at her feet.

Scientists are interested in monitoring the crustal disturbances occuring around Greenland, some of which can be caused by "post-glacial rebound," the process by which land forms rise under the lessening mass of melting ice sheets.