Landslide susceptibility and land modified by man map of part of the Baden 7-1/2 minute Quadrangle, Allegheny County, and vicinity, Pennsylvania

Abstract

Landslide susceptibility and land modified by man map of part of the Baden 7-1/2-minute quadrangle, Allegheny County and vicinity, Pennsylvania By J. S. PomeroyThe purpose of this map is to identify areas with potential slopestability problems significant to development. Essentially, it is a guide to areas of past landslide and present landslide susceptibility.The map is not designed to replace detailed studies of specific sites by competent technical personnel. Rather, it delineates areas where such detailed studies are most vital to tfie safety and welfare of the general public. In these areas, site examinations are necessary in jorder to seek firm evidence of the degree of difficulty that slope 'instability may pose to a contemplated land use, and so to define (whether costs of hazard prevention are commensurate with the value of ! 15-|the contemplated use. Preparation of the map was sponsored by the i i Appalachian Regional Commission (ARC contract no. 74-31). 20-The map is based on an interpretation of large-scale (1:12,000) aerial photographs (series GS-VDGY) taken on April 14, 1973. One day of field work during late 1973 supplemented the aerial photograph interpretations. Information from soil surveys by the Soil Conservation Service (U.S. Dept. of Agriculture, 1973) was integrated with data from an early geologic map (Munn, 1911) and other reports listed in the references.