Port Hills geotechnical information and updates

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Slope stability in the Port Hills

On 5 November 2013 the Christchurch City Council released the findings of the first of a series of reports looking at Port Hills slope stability post-earthquakes.

Prepared by the Institute of Geological and Nuclear Sciences Ltd (GNS Science) for the Council, "The Canterbury Earthquakes 2010/11 Port Hills Slope Stability" Stage One report details investigations of 36 areas in the Port Hills where mass land movement has occurred.

Further information is available online at http://www.ccc.govt.nz/environment/land/slope-stability/port-hills-gns-reports/


Port Hills 3D rockfall modelling report

The Canterbury Earthquake Recovery Authority (CERA) commissioned Geovert Ltd to carry out a three-dimension (3D) rockfall modelling study on the Port Hills.

The aim of this study, together with other investigations and work commissioned by the Christchurch City Council, was to help CERA to develop its policy advice to Cabinet regarding zoning decisions for rockfall and boulder roll-affected areas in the Port Hills.

Read the Port Hills 3D rockfall modelling report »


Port Hills GNS reports – September 2012

A series of seven detailed technical reports on slope instability on the Port Hills have been prepared by GNS Science for the Christchurch City Council.

The reports, released 28 September 2012, were prepared in response to the 2010-2011 Canterbury Earthquakes and contain recommendations for the Council on how to address the risk from rockfall/boulder roll and cliff collapse.

The findings of the reports have been used by CERA and the Christchurch City Council to assist with decisions on zoning, planning and infrastructure development, and regulatory matters.

The reports are available on the Council's website at: www.ccc.govt.nz/porthillsgnsreports

In addition to the reports there are about 400 separate maps to assist the reader of the reports in their interpretation of the report findings.


Geotech information and updates for residents

Christchurch City Council has information, updates, and FAQs on their website at http://www.ccc.govt.nz/environment/land/slope-stability/port-hills-gns-reports/ including the following fact sheets:

An email circulation list has been set up for residents of affected areas of the Port Hills. You can register to receive email updates by sending an email request to 

Video: Geotechnical and ground truthing studies on the Christchurch Port Hills

Dr Jan Kupec, Chief Geotechnical Engineer for CERA and John Scott, former Port Hills project manager for CERA, discuss geotechnical and ground truthing studies Christchurch City Council and GNS Science conducted on the Port Hills.


Video: Port Hills red zone - effects of the earthquakes

Land on the Port Hills was rezoned on 29 June 2012. To help understand why some of the land has been zoned red, geotechnical engineer Dr Jan Kupec discusses the effects of the earthquakes.

Part 1

Part 2


Video: Dr Jan Kupec talks about the Port Hills and the unique geotechnical issues of the area

Dr Jan Kupec puts the spotlight on the Port Hills and the unique geotechnical issues of the area.

The Canterbury Earthquake Authority (CERA) is creating a series of videos aimed at helping people understand what earthquakes have done to the land around Christchurch.

The videos feature CERA chief geotechnical engineer Dr Jan Kupec who is an expert on what is happening under the ground.