Canterbury Liquefaction Susceptibility

Canterbury Liquefaction Susceptibility

Created by: canterburymaps
Last updated: Sunday, March 12, 2017



 Environment Canterbury has commissioned several liquefaction reports and maps for Canterbury since 2000.

The reports and maps outline broad zones where liquefaction is more or less likely due to the general nature of the soils and water table in the area.  None of the reports or maps give the likelihood of liquefaction for a particular site or land parcel.  This is because soil types, and thus the tendency for liquefaction, can change a lot over very short distances - so soils on one property might be prone to liquefaction, while soils on the neighbouring property aren't.  To assess the liquefaction hazard for every single property in Canterbury would cost tens of millions of dollars.  Instead, these reports and maps show areas where liquefaction is less likely and special geotechnical assessment is not needed, and areas where liquefaction is more likely.  In these more likely areas a geotechnical assessment may be needed before building to assess more accurately how susceptible the soil is to liquefaction and what can be done to minimise any future damage from liquefaction.  In this way a geotechnical assessment for a particular site is only done where and when it is needed.

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Map Credits

GNS Science, Beca, Lincoln University, University of Canterbury, Landcare Research, Golder Associates, Greg Curline, Coffey Geotechnics Ltd, Tonkin & Taylor Ltd, Eagle Technology, Environment Canterbury.

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