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Landslides in Indiana are caused by a combination of steep slopes (topography), glacial and post-glacial soils (stratigraphy), weathered shale, and a pronounced wet rainy season (typically March through May). It requires the interaction some of the four to create landsliding in Indiana.
In evaluating the landslides compiled for the presentation, four generalized types of landslides are discussed. 1)High bluff peeloff 2)Groundwater Blowout 3)Deep-seated and 4)Shallow colluvial (includes landslides that involve fill material). Ingeneral, there are various combinations of these generalized landslide types, as one type of mechanism may lead to another. The presentation includes some case histories that describe approaches for repairing slopes with these types of landslides, improving the stability of slopes that could be affected by landslides, and reducing the hazard from debris flows to highways and properties below landslides.
There are emphasis on evaluating factors that influence soil stability, and presenting general remedial measures for the types of slope instability found in Indiana.