The epicentre was closer to Christchurch, and shallower at 5 kilometres (3 mi) underground, whereas the September quake was measured at 10 kilometres (6 mi) deep. Results of liquefaction the fine washed-up sand solidifies after the water has run offĪlthough smaller in magnitude than the 2010 earthquake, the February earthquake was more damaging and deadly for a number of reasons. According to GNS Science seismologists, the energy released in Christchurch was equivalent to a magnitude 6.7 earthquake. New Zealand's GNS Science has stated that the earthquake was part of the aftershock sequence that has been occurring since the September magnitude-7.1 quake, however a seismologist from Geoscience Australia considers it a separate event given its location on a separate fault system. The 6.3-magnitude earthquake may have been an aftershock of the 7.1-magnitude 4 September 2010 Canterbury earthquake. Geology Ĭlass=notpageimage| Location of the 12:51pm quake epicentre in Christchurch Adjusted for inflation, the earthquake caused over NZD$77 billion in damage, making it New Zealand’s costliest natural disaster and the 21st-most-expensive disaster in history. Subsequent population loss saw the Christchurch main urban area fall behind the Wellington equivalent, to decrease from second- to third-most populous area in New Zealand. While the initial quake only lasted for approximately 10 seconds, the damage was severe because of the location and shallowness of the earthquake's focus in relation to Christchurch as well as previous quake damage. The earthquake was felt across the South Island and parts of the lower and central North Island. Significant liquefaction affected the eastern suburbs, producing around 400,000 tonnes of silt. It caused widespread damage across Christchurch, killing 185 people, in New Zealand's fifth-deadliest disaster.Ĭhristchurch's central city and eastern suburbs were badly affected, with damage to buildings and infrastructure already weakened by the magnitude 7.1 Canterbury earthquake of 4 September 2010 and its aftershocks. The M w6.2 ( M L6.3) earthquake struck the entire of the Canterbury region in the South Island, centred 6.7 kilometres (4.2 mi) south-east of the central business district. Port Hills near Christchurch, Canterbury, New Zealandģ.5 m (11 ft) tsunami waves in the Tasman Lake, following quake-triggered glacier calving from Tasman Glacier Ī major earthquake occurred in Christchurch on Tuesday 22 February 2011 at 12:51 p.m.
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