Helen L. Delano Francis Ashland 2015 <div>A large inventory of landslides exists for Allegheny County, Pa., and historical movement of many</div><div>of these has resulted in considerable damage to property, roads, and infrastructure. Along Interstate</div><div>Route 79, a subset of the landslide inventory includes deep-seated rockslides, two of which reactivated</div><div>during construction of the highway in the late 1960s (Gray and others, 2011). Following the initial</div><div>movement of the rockslides, slope-stability investigations were conducted (Hamel, 1969; Hamel and</div><div>Flint, 1969), and measures were taken to reduce their impacts to the highway, but movement of at least</div><div>one of the rockslides persists even today. Long-term continuous monitoring of such landslides provides</div><div>critical data used to assess how the state of activity and velocity of movement (when the landslide is</div><div>active) change with rainfall and snowmelt. Currently, we are continuously monitoring meteorological</div><div>conditions and movement of a rockslide along the northbound side of Interstate Route 79 in Aleppo, Pa.</div><div>(Figure 1). The project is intended to extend over many years (approximately 5 to 10) in order to collect</div><div>sufficient data to assess how extreme storms, prolonged wet periods, and melting of the snowpack affect</div><div>the landslide. The rockslide is an ideal location for such long-term monitoring because the land is owned</div><div>by the Pennsylvania Department of Transportation (PennDOT), and movement is not directly impacting</div><div>the highway; therefore no stabilization measures are necessary in the short term.</div> application/pdf en PA Bureau of Topographic and Geologic Survey Continuous monitoring of meteorological conditions and movement of a deep-seated, persistently moving rockslide along Interstate Route 79 near Pittsburgh article