From deep seated slope deformation to rock avalanche: Destabilization and transportation models of the Sierre landslide (Switzerland)

Sackung is a widespread post-glacial morphological feature affecting Alpine mountains and creating characteristic geomorphological expression that can be detected from topography. Over long time evolution, internal deformation can lead to the formation of rapidly moving phenomena such as a rock-slide or rock avalanche. In this study, a detailed description of the Sierre rock-avalanche (SW Switzerland) is presented. This convex-shaped postglacial instability is one of the larger rock-avalanche in the Alps, involving more than 1.5 billion m3 with a run-out distance of about 14 km and extremely low Fahrböschung angle. This study presents comprehensive analyses of the structural and geological characteristics leading to the development of the Sierre rock-avalanche. In particular, by combining field observations, digital elevation model analyses and numerical modelling, the strong influence of both ductile and brittle tectonic structures on the failure mechanism and on the failure surface geometry is highlighted. The detection of pre-failure deformation indicates that the development of the rock avalanche corresponds to the last evolutionary stage of a pre-existing deep seated gravitational slope instability. These analyses accompanied by the dating and the characterization of rock avalanche deposits, allow the proposal of a destabilization model that clarifies the different phases leading to the development of the Sierre rock avalanche.

Report Recycled Content Plastic Bag and Soy Inks, Iowa Department of Transportation, 2003

Report to Margaret Thompson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

FY 2003 Revolving Fund Purchase Order Report, Iowa Department of Transportation, 2003

Report written by Iowa DOT to Auditor Office about revolving fund purchase order.

Code Section 307.46(2) - Use of Reversions Report, Iowa Department of Transportation, 2003

Use of Reversions Report

Report Recycled Content Plastic Bag and Soy Inks, Iowa Department of Transportation, 2002

Report to Margaret Thompson, Chief Clerk, about Recycled Content Plastic Bag and Soy Inks.

Products and Services Purchased From Iowa Prison Industries, Iowa Departation of Transportation, October 29, 2002

Items purchased from Iowa Prison Industries for Iowa Departation of Transportation

Iowa Department of Transportation Fiscal Year 2002 Report of Savings by Using Videoconferencing through Iowa Communications Network to the Iowa General Assembly, 2002

ICN Videoconferencing by the Iowa Department of Transportation

Biodiesel Fuel Revolving Fund Expenditures, Iowa Department of Transportation, January 2003

Biodiesel Fuel Revolving Fund Expenditures for Iowa Department of Transportation

Department of Transportation Performance Plan, Iowa Department of Transportation, 2003

Performance plan for Iowa Department of Transportation.

Iowa Department of Transportation Fiscal Year 2003 Report of Savings by Using Videoconferencing Through Iowa Communications Network, Iowa Department of Transportation, December 2003

Iowa DOT savings through use of Iowa Communications Network (ICN)videoconferencing.

Iowa Department of Transportation Office of Contracts Letting Summary, July 1, 2002 - June 30, 2003

Summary of contracts let by Iowa DOT Office of Contracts in 12 regular and three emergency/special lettings during FY 2003 for construction and maintenance work. It also contains a comparison of quantities and unit contract prices for various items of highway construction work for projects let in fiscal years 2000, 2001, 2002 and 2003.

Biodiesel Fuel Revolving Fund Expenditures Fiscal Year 2003 Report, Iowa Department of Transportation, January 2004

Report of expenditures from the biodiesel fuel revolving fund for biodiesel fuel used in Iowa Department of Transportation vehicles.

Report of Recommendations to the Iowa Department of Transportation, June 30, 2002

State Agency Audit Report

Report of Recommendations to the Iowa Department of Transportation on the Review of Selected General and Application Controls over the Human Resource Information System, May 27, 2003 - June 30, 2003

State Agency Audit Report