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Christchurch cathedral. Magnitude 6.3 - SOUTH ISLAND OF NEW ZEALAND. http://msnbcmedia.msn.com/j/MSNBC/Components/Slideshows/_production/ss-110221-new-zealand-quake/ss-110221-nz-quake-10.ss_full.jpg. Christchurch cathedral. Reasons for high levels of loss: Location of the earthquake

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slide1

Christchurch cathedral

Magnitude 6.3 - SOUTH ISLAND OF NEW ZEALAND

http://msnbcmedia.msn.com/j/MSNBC/Components/Slideshows/_production/ss-110221-new-zealand-quake/ss-110221-nz-quake-10.ss_full.jpg

slide2

Christchurch cathedral

  • Reasons for high levels of loss:
  • Location of the earthquake
  • Peak ground accelerations
  • Nature of the buildings
  • Ground conditions
  • Time of day
  • http://blogs.agu.org/landslideblog/2011/02/23/on-the-causes-of-the-high-levels-of-loss-in-the-christchurch-earthquake/

http://msnbcmedia.msn.com/j/MSNBC/Components/Slideshows/_production/ss-110221-new-zealand-quake/ss-110221-nz-quake-10.ss_full.jpg

slide3

http://earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110221.phphttp://earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110221.php

slide4

All aftershocks since Sept. 4 2010 (red are deep; star is Feb 21, 2011 event)

http://www.christchurchquakemap.co.nz/week

http://earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110221.php

http://www.geonet.org.nz

http://www.geonet.org.nz

Canterbury M7.2 earthquake Sept. 4 2010

M6.3 aftershock Feb. 21, 2011

slide5

Shaking intensity in the city was much greater for this earthquake than the magnitude 7.1 earthquake from last September, or any of the aftershocks. The highest shaking was recorded at Pages Road Pumping Station at 188 %g, with readings of 127 %g at Heathcote Valley Primary School and 107 %g at Hulverstone Road Pumping Station.

This is due to the proximity of the epicentre to the city and the shallow depth. The earthquake has a reverse faulting mechanism.

http://www.geonet.org.nz/news/feb-2011-christchurch-badly-damaged-by-magnitude-6-3-earthquake.html

slide6

Nature of the buildings: good earthquake building safety regulation, but old ones are hard to retrofit and this was very strong shaking even for newish buildings

http://www.nzherald.co.nz/christchurch-earthquake-photos

slide7

Ground conditions and liquefaction

http://media.nzherald.co.nz/webcontent/image/jpg/20119/st6201.jpg

slide8

Time of day: people are out and about at 11 am

http://blogs.agu.org/landslideblog/files/2011/02/11_02-New-Zealand-damage.jpg

slide9

http://www.stuff.co.nz/4688231/Large-quake-strikes-Christchurchhttp://www.stuff.co.nz/4688231/Large-quake-strikes-Christchurch

Important implications for the effects of M6 earthquakes in places like the US mid continent where some think that there would be only modest damage from such events.

 http://www.guardian.co.uk/world/gallery/2011/feb/22/new-zealand-earthquake-in-picture