Abbotsford landslide

Abbotsford landslide

LCI : NZL1612041852
Main Information
Landslide Name : Abbotsford landslide
Latitude : 45:53:50 S
Longitude : 170:26:05 E
Location
City / District : Abbotsford
Province : Dunedin
Country : New Zealand
Reporter
Reporter 1 : Ha Nguyen Duc
Reporter 2 : Graham Hancox
Landslide Type
Material : Earth
Movement : Slide
Velocity (mm/sec) : Rapid
Depth (m) : Deep-Moderate
Slope (degree) : Very Gentle
Volume (m³) : Large-Moderate
Date of Occurence
Date of Occurence : Aug 08, 1979
Other Information
Land Use Source area : Wildland, Urban area
Run-out/deposition area : Wildland, Urban area, Road
Other Activity : -
Triggering Factor : Human activity and rainfall
Death(s) & Missing : -
Houses and other structural damage : 69
Photo of landslide : Abbotsford.JPG
Google earth kmz file : Abbotsford landslide.kmz
Plan of landslide : -
Cross section of landslide : Abbotsford landslide cross section.JPG
Reference (paper/report) : http://link.springer.com/article/10.1007/s10346-007-0097-9
Testing graph : -
Monitoring graph : -
Video of moving landslides including 3D simulation : -
Description :

On August 8, 1979, a large translational block landslide occurred in Abbotsford – residential suburb of southwest Dunedin, New Zealand after several weeks of preliminary movements. In the history of New Zealand, the Abbotsford landslide is considered as the biggest landslide in an urbanized area. This landslide (with an area of 18 hectares and a volume of 5 million m3) moved a distance of around 50 meters down the hill at an average speed of approximately 1.7 m/min. The maximum thickness of the slide mass was up to 40 meters. No-one was injured or killed, however, the landslide caused the destruction of almost 70 houses with economic losses are around NZ $ 10-13 million. The Abbotsford landslide was contributed by two man-made factors: A sand quarry (closed 10 years earlier) at the toe of the slope and a leaking water main beyond the landslide area. Another factor which added to the initiation of the failure is high ground water levels because of the increased precipitation over the past decade. This report referred the research in the paper: Graham T. Hancox (2008) The 1979 Abbotsford Landslide, Dunedin, New Zealand: a retrospective look at its nature and causes. Landslides 5:177–188