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Images, eqnz.chch.2010

This block of shops on Victoria Street was so badly damaged that it had to be demolished following the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The ground literally opened up! On the previously unknown faultline along which the Saturday 4 September 2010 earthquake originated.

Images, eqnz.chch.2010

The facade of this shop on Manchester Street was reduced to a heap of rubble during the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

This shop at the Colombo Street / Tuam Street corner lost its side wall in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The ground literally opened up! On the previously unknown faultline along which the Saturday 4 September 2010 earthquake originated.

Images, eqnz.chch.2010

The ground literally opened up! On the previously unknown faultline along which the Saturday 4 September 2010 earthquake originated.

Images, eqnz.chch.2010

This shop at the Colombo Street / Tuam Street corner lost its side wall in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Parts of the facade of the Anglican Community of the Sacred Name building on Barbadoes Street ended on the street during the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

Parts of the facade of the Anglican Community of the Sacred Name building on Barbadoes Street ended on the street during the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

The ground literally opened up! On the previously unknown faultline along which the Saturday 4 September 2010 earthquake originated.

Images, eqnz.chch.2010

This shop caught fire when power restored caused sparks that ignited leaking gas, in the aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Colombo Street was eerily quiet and deserted during the Tuesday evening rush hour, in the aftermath of the magnitude 7,1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Red stickered building means no access, and the building may be condemned if it cannot be repaired; aftermath of the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

The belfry of the St John the Baptist Church at Latimer Square was reduced to rubble by the magnitude 7,1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Cracks in the parapet of this beautiful Madras Street building that I walk past to / from work everyday; aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Cracks in the parapet of this beautiful Madras Street building that I walk past to / from work everyday; aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Cracks in the beam of this beautiful Madras Street building that I walk past to / from work everyday; aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Red stickered door means that this pub on Madras Street is no-go due to structural damage suffered in the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The Dick Smith Electronics shops at St Asaph Street / Colombo Street was extensively damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The Dick Smith Electronics shops at St Asaph Street / Colombo Street was extensively damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Yellow stickered building means restricted access, and the building will need to be repaired and certified fit for use; aftermath of the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

The Dick Smith Electronics shops at St Asaph Street / Colombo Street was extensively damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Deserted Tuam Street which is always busy during Tuesday evening rush hour, in the aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The belfry of the St John the Baptist Church at Latimer Square was reduced to rubble by the magnitude 7,1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Deserted Tuam Street which is always busy during Tuesday evening rush hour, in the aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The Dick Smith Electronics shops at St Asaph Street / Colombo Street was extensively damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

There will be some very upset kids this Christmas, as Santa will not be able to deliver their presents; aftermath of the magnitude 7,1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

The belfry of the St John the Baptist Church at Latimer Square was reduced to rubble by the magnitude 7,1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Part of the parapet fell off from this Burger King outlet on Bealey Ave during the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Research papers, University of Canterbury Library

The 22 February 2011, Mw6.2-6.3 Christchurch earthquake is the most costly earthquake to affect New Zealand, causing 181 fatalities and severely damaging thousands of residential and commercial buildings, and most of the city lifelines and infrastructure. This manuscript presents an overview of observed geotechnical aspects of this earthquake as well as some of the completed and on-going research investigations. A unique aspect, which is particularly emphasized, is the severity and spatial extent of liquefaction occurring in native soils. Overall, both the spatial extent and severity of liquefaction in the city was greater than in the preceding 4th September 2010 Darfield earthquake, including numerous areas that liquefied in both events. Liquefaction and lateral spreading, variable over both large and short spatial scales, affected commercial structures in the Central Business District (CBD) in a variety of ways including: total and differential settlements and tilting; punching settlements of structures with shallow foundations; differential movements of components of complex structures; and interaction of adjacent structures via common foundation soils. Liquefaction was most severe in residential areas located to the east of the CBD as a result of stronger ground shaking due to the proximity to the causative fault, a high water table approximately 1m from the surface, and soils with composition and states of high susceptibility and potential for liquefaction. Total and differential settlements, and lateral movements, due to liquefaction and lateral spreading is estimated to have severely compromised 15,000 residential structures, the majority of which otherwise sustained only minor to moderate damage directly due to inertial loading from ground shaking. Liquefaction also had a profound effect on lifelines and other infrastructure, particularly bridge structures, and underground services. Minor damage was also observed at flood stop banks to the north of the city, which were more severely impacted in the 4th September 2010 Darfield earthquake. Due to the large high-frequency ground motion in the Port hills numerous rock falls and landslides also occurred, resulting in several fatalities and rendering some residential areas uninhabitable.