Clustering of Large Bedrock Landslides and Recurrent Slope Failure: Implications for Land Seismic Hazard Assessment of the Tien Shan - Djungaria Region

摘要: Spatial distribution of bedrock landslides in the Tien Shan - Djungaria mountain system is analyzed based on an inventory including more than 700 features, most which are prehistoric and exceed 10 6 m 3 volume. They often concentrate within limited areas several tens kilometres size, forming clusters divided by without or with very rare same-size slope failures. Two main types landslide exemplified case studies from Chinese Kazakh parts this system: those that have one giant feature surrounded numerous much smaller include less features. Though no data about ages failures formed these available, some cases simultaneity their formation can be assumed reasonable confidence. Besides, evidence recurrent failure presented. Considering arid climate region glaciation, large earthquakes likely trigger such spatially temporally localized failures, though additional necessary to prove assumption. In any and, likely, seismic hazard zones seem higher surrounding rockslide-free areas.