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The Geological Society of America Journal Geology: Dynamic geoscience
Date:2/12/2013

of years, and discover that only 11% plus or minus 8% of the total carbon dioxide has reacted with the host rock. As only a low percentage has reacted after millions of years, then it is likely that very little reaction will occur in the thousands of years of storage which are needed for reduce anthropogenic climate change. This lack of reaction is not a problem for geological carbon storage, but means that such reaction cannot necessarily be relied upon to trap the carbon dioxide as solid mineral phases.


Recurrent liquefaction in Christchurch, New Zealand, during the Canterbury earthquake sequence Mark C. Quigley et al., Dept. of Geological Sciences, University of Canterbury, Christchurch 8014, New Zealand. Posted online 7 Feb. 2013; http://dx.doi.org/10.1130/G33944.1.

Repeated liquefaction in Christchurch, New Zealand, during a series of major earthquakes between 2010 and 2011 resulted in the national government classifying almost 6000 residential properties in eastern Christchurch at a loss of over US$800 million. The lead author of this study lived in one of these properties throughout the earthquake sequence and witnessed 10 successive liquefaction episodes in his backyard (literally). The areal extent and thickness of sand ejected to the surface (i.e., "sand blows") during each one of these episodes was mapped and measured and compared to the seismological attributes of the well-recorded earthquakes, recorded by three seismometers within 3 km of the study site. This is the perhaps the world's best observational record of liquefaction. The seismologic threshold for causing liquefaction was determined, providing crucial data for liquefaction susceptibility studies at this and other analogous sites around the planet. New empirical relationships were derived to enable paleoseismologists to deduce the relative seismological characteristics (i.e., peak ground acceleratio
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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