Abstract
A New Zealand Landslide Database has been developed to hold all of New Zealand’s landslide data and provide factual data for use in landslide hazard and risk assessment, including a probabilistic landslide hazard model for New Zealand, which is currently being developed by GNS Science. Design of a national Landslide Database for New Zealand required consideration of existing landslide data stored in a variety of digital formats and future data yet to be collected. Pre-existing landslide datasets were developed and populated with data reflecting the needs of the landslide or hazard project, and the database structures of the time. Bringing these data into a single database required a new structure capable of containing landslide information at a variety of scales and accuracy, with many different attributes. A unified data model was developed to enable the landslide database to be a repository for New Zealand landslides, irrespective of scale and method of capture. Along with landslide locations, the database may contain information on the timing of landslide events, the type of landslide, the triggering event, volume and area data, and impacts (consequences) for each landslide when this information is available. Information from contributing datasets include a variety of sources including aerial photograph interpretation, field reconnaissance and media accounts. There are currently 22,575 landslide records in the database that include point locations, polygons of landslide source and deposit areas, and linear landslide features. Access to all landslide data is provided with a web application accessible via the Internet. This web application has been developed in-house and is based on open-source software such as the underlying relational database (PostGIS) and the map generating Web Map Server (GeoServer). Future work is to develop automated data-upload routines and mobile applications to allow people to report landslides, adopting a consistent framework.
Highlights
Landslides play an important role in the evolution of landscapes, but they can be hazardous to people and economies
This paper describes the development of the New Zealand Landslide Database (NZLD)
Several large datasets are awaiting upload which will bring the total number of landslide records to over 200,000
Summary
Landslides play an important role in the evolution of landscapes, but they can be hazardous to people and economies. The Earthquake-induced Landslide maps were prepared using information compiled from a review of New Zealand literature on earthquake-induced landslides and analysis of aerial photos and topographic maps These landslide distributions, together with other types of environmental effects (e.g. liquefaction and ground cracking), were used by Hancox et al (2002) to estimate Modified Mercalli (MM) shaking intensities. These earthquake-induced landslides were initially captured as point coordinate data only, rather than their spatial extent (polygons), landslide source and deposit areas have been mapped for more recent events, since the 2003 Mw 7.2 Fiordland Earthquake (Hancox et al 2003, 2014, 2015). The dataset includes areas of liquefaction and other ground damage sites, shaking intensity contours (isoseismals) and the epicentres of
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