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The possibility of earthquake-caused liquefaction in Taranaki is low, with just a few coastal areas potentially having the type of soil that might liquefy.
However those areas would need to be soil-tested before the potential for liquefaction can be confirmed or discounted.
In preparing the report, GNS Science examined existing land data held by South Taranaki, Stratford and New Plymouth district councils and Taranaki Regional Council as well as geological information held by GNS.
The key points in the report are:
Please note, this report and fact sheet is from 2013 and should not be used for reference when applying for building consents. Up-to-date information can be found here.
New Plymouth District Council will carry out more detailed investigations (cone penetrometer tests) at five river-mouth areas that have urban areas or residential buildings to confirm or discount the liquefaction potential. These areas are at Waitara, Onaero, Urenui, Tongaporutu and Mohakatino.
South Taranaki District Council Environmental Group Manager John McKenzie says STDC will add the GNS report to its hazard information that is used at times of development, such as when a building consent is applied for or when a land information memorandum is produced.
The New Zealand MM – or Modified Mercalli – intensity scale grades the impact of an earthquake on people, which can be more useful as an indicator of the earthquake’s significance to the community than the absolute size of the earthquake itself. More information on the MM intensity scale is available on GeoNet’s website.
Taranaki liquefaction fact sheet
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Page last updated: 10:48PM Wed 21 September 2022