THE VARYING DAMAGE OF THE CHRISTCHURCH EARTHQUAKES

THE VARYING DAMAGE OF THE CHRISTCHURCH EARTHQUAKES

Damage from the Canterbury earthquakes varied greatly from region to region of Christchurch. One street may have been completely destroyed, while another in close proximity was untouched. The reason for this variance is multifaceted. Different soil types react differently to seismic activity, and each area has differing styles of buildings. This means that areas with older buildings may have had more earthquake damage. Land near waterways vulnerable Much of Christchurch city and its immediate neighbouring settlements are situated on river deposits, beach dune sand, estuaries, lagoons and swamplands that have been drained over time. Before the construction of stopbanks and river realignment in the mid 19th century, the Waimakariri River […]

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TYPES OF BUILDING DAMAGE

TYPES OF BUILDING DAMAGE

Building damage can be divided into two broad categories: damage that was caused solely by earthquake shaking; and damage that resulted from ground deformation including liquefaction, lateral spreading or landslip. While shaking damage to dwellings has been observed on the flat, the February and June 2011 aftershocks in particular caused significant shaking damage to hillside houses. The observed high vertical accelerations were responsible for severe damage sustained by tile roofs and brick veneers, and unreinforced foundations were often severely cracked. Liquefaction effects on buildings Liquefaction-induced ground movement has caused stretching, hogging, dishing, racking/twisting, tilt, differential settlement, differential displacement or any combination of the above to buildings. The severity of the […]

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