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GEOLOGY starts 2013 with 25 new articles posted online ahead of print
Date:1/30/2013

rd University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA. Posted online 17 Jan. 2013; http://dx.doi.org/10.1130/G33783.1.

The largest known strike-slip earthquake of magnitude 8.6 occurred on 11 April 2012 off the northwestern coast of Sumatra. This earthquake ruptured within the Indo-Australian plate, and the slip propagation is shown to be primarily southeast to northwest using seismological and tsunami data. This trend is almost parallel to the nearby trench where the 2004 magnitude 9 Sumatran earthquake occurred. These megathrust events are known to promote subsequent failures within the subducting plate, suggesting that the great earthquake in 2012 is a consequence of the devastating 2004 Sumatran earthquake. Furthermore, this region is characterized by oblique plate convergence, and the trench-parallel component is thought to be taken up by the Great Sumatran Fault on the island of Sumatra. There have been rising concerns that the expected slip from the plate convergence rate is much larger than the observed slip on the Great Sumatran Fault, which has been interpreted as a sign of an impending large earthquake. We propose that the missing slip is mostly accounted for by the magnitude 8.6 earthquake in 2012. If such partitioning of slip between two plates occurs along other oblique subduction zones, the hazard potential of the faults on over-riding plates must be reevaluated.


Eoarchean within-plate basalts from southwest Greenland
F.E. Jenner et al., Dept. of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road Northwest, Washington, DC 20015, USA; and Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia. Posted online 17 Jan. 2013; http://dx.doi.org/10.1130/G33787.1.

Previous geochemical studies have us
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Contact: Kea Giles
kgiles@geosociety.org
303-357-1057
Geological Society of America
Source:Eurekalert  

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