[1] Univ Alaska Fairbanks, Inst Northern Engn, Fairbanks, AK 99775 USA
[2] Univ Wyoming, Dept Geol & Geophys, Laramie, WY USA
[3] Univ Wyoming, Dept Civil & Architectural Engn & Construct Manage, Laramie, WY USA
[4] B Geos, Korneuburg, Austria
[5] Michigan Technol Univ, Houghton, MI USA