What we do.The Active Earth. Land stability : GNS Science Limited

Among the most dangerous processes are deep-seated landslides, such as the 1991
collapse of the summit area of Mount Cook, and the 1979 Abbotsford landslide that destroyed 63 houses in southern Dunedin, fortunately without loss of life. Understanding the processes that lead to slope collapse and the
subsequent landslides, provides fundamental knowledge about evolving landscapes, and essential information for safety.

The Falling Mountain rock avalanche, triggered by the 1929 Arthur's Pass earthquake, resulted
in 55 million cubic metres of rock spread 4.5 km down the valley.

Probably the most significant catastrophic landslide in New Zealand is the Green Lake
landslide near Lake Manapouri. This 26 cubic-kilometre slide occurred about 13,000 years ago
due to the collapse of 10 km of the Southern Hunter Mountains. It may be the world's largest
rock slide.

Institute scientists, supported by comprehensive digital and manual landslide and geology databases, cover all aspects of engineering geology and hazard assessment for resource management, urban and industrial developments, and hydroelectric and geothermal power projects. The evaluation of reservoir stability and landslides incorporates
geophysical techniques such as high resolution seismic refraction and reflection surveys, and shear-wave velocity measurements to locate faults and the depth of landslides. Adverse geological conditions in mines, quarries, tunnels and along roads are common causes of construction
delays and accidents. Slope and foundation stability research, rock condition, and hazard assessment helps minimise the adverse effects of geological processes and hazards in New Zealand.

For more information contact
Graham Hancox or
Maurie McSaveney