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Liquefaction Lab reveals potential land damage

Wednesday, July 29, 2020   Posted in: Signatory Notice Board By: Administrator With tags: disasters, land, earthquake, technology

Christchurch City Council Newsline: 29th July 2020

A new interactive online tool will help people better understand how the ground in Christchurch may respond in an earthquake.

The online Liquefaction Lab tool uses the extensive information about ground conditions gathered since the 2010-11 Canterbury earthquakes to visualise an area’s vulnerability to liquefaction under different conditions.

The Liquefaction Lab shows different patterns of land damage that are likely to occur across the city by taking into account the magnitude and location of the earthquake and groundwater levels.

“We have taken all the observations about how the land has performed in previous earthquakes and brought these together with the extensive data and research gathered since then to map the liquefaction vulnerability of all the flat land in Christchurch,” Christchurch City Council Head of Strategic Policy Emma Davis says.

“This has given us an exceptional understanding of the liquefaction hazard across our district, which allows us to make informed decisions about future land use and the building controls required to manage risk,” Ms Davis says.

“This information will be used to guide design of our infrastructure and where we place it.

“Understanding which areas are likely to be affected by liquefaction in an earthquake, and the scale of damage is also valuable for Civil Defence planning and response, and managing engineering lifelines such as roading, telecoms and power.

“The online tool will also be particularly useful for people to understand the possible liquefaction vulnerabilities of properties in different areas of the city.”

The mapping includes new vulnerability categories that will eventually replace the TC1, 2 and 3 categories introduced in Christchurch after the earthquakes, as the Ministry of Business, Innovation and Employment (MBIE) introduces the new categories nationwide by next year.