B011 A COMPLEX GEOSCIENTIFIC STRATEGY FOR LANDSLIDE HAZARD MITIGATION – CASE STUDY SIBRATSGFÄLL Abstract 1 A short period of heavy precipitation and the rapid melting of snow in spring of 1999 initiated a catastrophic landslide on the South-flank of the Rubach Valley near Sibratsgfäll in the federal state of Vorarlberg (Austria). The 1.4 km 2 wide slide area covered from 830 m to 1500 m seelevel. The movement rates of rock- and debris bodies involved exceeded up to 1m per day. A complex geoscientiffic research programmwas initiated shortly after the first slide activity was noticed. The study incorporated a geo-morphological


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