Hancox, G.T.; Perrin, N.D. 2010 Sites of potential landslides that could damage water pipelines in the Greater Wellington Region during a Wellington Fault earthquake Lower Hutt, N.Z.: GNS Science. GNS Science report 2010/12 35 p.
Abstract: This report describes sites along pipelines in the Greater Wellington Region (GRW) that are potentially susceptible to earthquake-induced landsliding or liquefaction (lateral spreading, subsidence) caused by very strong (intensity MM)-10) shaking during a magnitude 7.6 earthquake on the Wellington Fault. Recognition and assessments of these sites are based on an aerial inspection of the pipeline route, detailed analysis of high resolution oblique aerial photographs, the authors’ knowledge of the local geology and ground conditions, stability of slopes in greywacke terrain, and an understanding of the behaviour and response of slopes in the Wellington area during historical earthquakes. Landslide susceptibility criteria used in GNS Science earthquake hazard studies since the mid 1990s were used to identify potential sites of landslides along the pipeline during a Wellington Fault earthquake. The coseismic failure potential of slopes adjacent to the pipeline network were rated using five landslide susceptibility classes based on slope angle, rock/soil types and ground conditions at the site. (auth/DG)