Southland - Liquefaction Risk 2006 - 2012Request Access
Southland - Liquefaction Risk 2006 - 2012 - The awareness of liquefaction has increased markedly since the Christchurch earthquakes. It is basically an earthquake related process of turning a solid soil into a liquid and weaker state. It is most likely to occur in saturated sands and silts. Related to liquefaction is a process called lateral spreading, whereby land moves towards lower areas whilst in a semi liquid state. The Southland areas considered most susceptible to liquefaction include low lying areas of hydraulic fill, peat mires, low lying parts of lake deltas and around the margins of the fjords. The last two magnitude 7+ earthquakes (22 August 2003 and 15 July 2009) resulted in isolated pockets of liquefaction.
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