Liquefaction occurred across the whole city but was a major issue in eastern parts and around the central business district. Liquefaction can cause significant damage to land, buildings and infrastructure, through sediment being ejected to the ground surface, and subsequent ground settlement, ground cracking and lateral spreading. 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. The September 4, 2010, quake was the first time major liquefaction was experienced in the region.
Christchurch is very familiar with liquefaction, with parts of the city experiencing significant liquefaction as a result of the 2010/2011 Canterbury Earthquakes.
Properties on the western side of the city and across the Canterbury Plains sitting on stony, gravelly soils were mostly unaffected by liquefaction. Following the earthquakes, a lot of information has been collected about the city’s ground conditions. Liquefaction is a well known natural process in Christchurch following the 2010/2011 Canterbury earthquakes. The September 4, 2010, quake was the first time major liquefaction was experienced in the region. Christchurch residents had been warned of the dangers from liquefaction for many years before that quake struck and have faced further clean-ups after February, most notably after the June 13 and December 23 quakes. Liquefaction in Christchurch Christchurch is very familiar with liquefaction, with parts of the city experiencing significant liquefaction as a result of the 2010/2011 Canterbury Earthquakes. 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US Election explainer: How does the Electoral College work? Following the earthquakes, a lot of information has been collected about the city’s ground conditions. The worst-hit areas of the city were those where houses had been built on loosely compacted ancient river or beach sands and sandy soils close to bodies of water, generally around the Avon River and close to the estuary. Whole suburbs in the east were covered in the clinging, stinking mud, especially those around the Avon River and the Avon-Heathcote Estuary. The amount and nature of liquefaction ground damage that occurs in an earthquake depends on the soil type, the strength of earthquake shaking and groundwater level at the time. The assessment (report [PDF, 10 MB] + appendices [PDF, 25 MB]) includes new vulnerability categories that will replace the TC1, 2, 3 technical categories introduced in Christchurch by MBIE after the earthquakes. 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