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What the report says

NZ Newswire logoNZ Newswire 31/03/2017

THE BUILDING

Statistics House is a six storey reinforced concrete office building with a lightweight roof. It was built in the CentrePort Harbour Quays business park in Wellington in 2005.

THE QUAKE

The epicentre of the November 14 magnitude 7.8 quake was more than 200km from Wellington and the closest point of fault rupture was 60km from the city.

More than 120 seconds of ground shaking was recorded.

DAMAGE

The corner of the building on floors one and two collapsed.

The building hasn't been occupied since the quake. Owner Centreport still hasn't decided its fate.

THE PAST

In 2013 engineers identified seating of the floor units at the four corners of the building as a critical issue.

The installation of catch brackets and diaphragm ties was completed on level four and partially completed on level three at the time of the Kaikoura earthquake.

HARBOUR

The fact the building is on reclaimed land was not a significant factor.

THE BASIN

The ground shaking from the earthquake was amplified because seismic waves reflected off of the edges of the geological basin beneath Wellington.

This is a basin-edge effect. At present there is not sufficient international or national research to say where a basin-edge effect may occur.

Basin-edge effects resulted in concentrated areas of damage during the 1994 Northridge (California) and 1995 Kobe (Japan) earthquakes.

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