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- Comparing the ground motion from the Feb 2011 and the Sept 2010 earthquakes (16 Ground motions) by Dr. Brendon Bradley
- Announcement: Open access to KAREN Video Conf. Bridge to facility CHCH response
- Selected images of the M6.3 Christchurch Earthquake February 22, 2011 Compiled by the staff of the CA Seismic Safety Commission by Fred Turner
- Processed ground motion plot for the main shock by John Zhao (GNS)
- Transect of Christchurch City after the earthquake of Tuesday February 22 by Assoc. Prof. Jason Ingham
- IPENZ fact sheet on the Earthquake, Rapid Building Assessment and Liquefaction.
- Preliminary report on pre-1970s RC buildings, RCM and precast staircases damage by Weng Yuen Kam
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Liquefaction Map - Drive-through Reconnaissance by Assoc. Prof. Misko Cubrinovski - Steel Building Damage Report by Professors Michel Bruneau, Charles Clifton, Greg MacRae, Roberto Leon and Mr. Alistair Fussell
- Prelimiinary Reconnaissance Report by Weng Kam, Umut Akguzel and Assoc. Professor Stefano Pampanin
A new message board has been set up to collect key observations and noteworthy lessons. Please feel free to share your comments there. You may post anonymously if you wish.
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A severe M6.3 earthquake struck Christchurch today, February 22 at 12:51 pm (2011-02-0 00:51 UTC). The epicentre was located approximately 10 km south-east of the Christchurch CBD, near Diamond Harbour, Lyttelton at a depth of less than 5 km. The shallowness nature, proximity to urban centre and the timing of the quake had meant that the quake was particularly devastating. The shaking intensity of this quake was much greater than that of the September 2010 Darfield main shock. Initial GeoNet reports shows a maximum horizontal acceleration of 1.88g at Pages Road Pumping Station. Accelerometer located at Christchurch Cathedral College in the CBD recorded a maximum acceleration of 0.8g. There has been a number of reports of unconfirmed fatalities. A wide range of modern and older buildings have been damage, a number have collapsed. The spire of the landmark Christchurch Cathedral has collapsed.
Location and isoseismal maps from Geonet are presented below.
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