Glenorchy liquefaction study

This is a detailed study of sediments underlying the Glenorchy township area, so we can understand the risks of liquefaction.


What is liquefaction?

Liquefaction is a natural process triggered by earthquake shaking, causing soil to behave like a fluid. The shaking causes sediment to eject onto ground surface, which then causes the ground to settle, crack or spread laterally. It results in temporary loss of soil strength, potentially causing significant damage to land, buildings and infrastructure.

Read more about what liquefaction is through this resource from Water New Zealand.


What is happening now?

A field investigation took place in October 2021, on road reserves in the Glenorchy township area, mostly along Oban, Coll, Islay and Mull Streets (Figure 1). It involved about 25 cone penetrometer tests (CPTs) and several boreholes using truck-mounted equipment.

We are now preparing the data for analysis. Reports of the result will be available on this page once ready.

Figure 1 - Approximate locations of liquefaction studyFigure 1 - Approximate locations of liquefaction investigation

Frequently asked questions

The findings of this study will help us better understand what effects earthquake shaking could have on the Glenorchy township and its people. This will assist with planning and preparation for earthquakes and other natural hazards. The results of the study will be made available on the website when ready.

We do not expect any significant disruption to the local residents. Works are planned to be carried out fully within road reserves, so no road closures or delays are expected.

No drilling will be taking place on private property.

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