Re: 6.3 and 5.6 Earthquakes Hit ChristChurch New Zealand February 21 2011 - Heavy Damage - Deaths
http://www.geonet.org.nz/news/feb-20...arthquake.html
Ground acceleration reached nearly 2 g according to geologists on Twitter and that is considered very high - enough to topple modern buildings.
http://www.geonet.org.nz/news/feb-20...arthquake.html
"Last updated February 22, 4:30 pm
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."
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."




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