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Date:5/20/2013

e large reservoirs can grow.


Can turbidites be used to reconstruct a paleoearthquake record for the central Sumatran margin?
Esther J. Sumner et al., Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, Hampshire SO14 3ZH, UK. Posted online ahead of print 9 May 2013; http://dx.doi.org/10.1130/G34298.1.

Large earthquakes are known to sometimes trigger huge underwater slides and flows of sediment in the oceans. An increasingly widespread technique is to sample these sediments, date them, and thereby infer the recurrence times of past major earthquakes that can be used in hazard assessment for future earthquakes. In this new study, Esther J. Sumner and colleagues tested whether large earthquakes reliably generate the types of deposit needed to reconstruct a complete and accurate earthquake record. They did this by analyzing the seafloor sediment record on the Sumatran subduction margin, in a region that experienced the third largest earthquake yet recorded in 2004 and numerous other large magnitude earthquakes in historical times. The seafloor sediment record offshore Sumatra reveals surprisingly little evidence for sediment slides and flows related to known large magnitude earthquakes. Therefore, large earthquakes on the Sumatran margin do not always trigger the large slides and flows of sediment necessary for reconstructing a complete and accurate history of major earthquakes. Until a better understanding is reached about why some seafloor slopes are more prone to widespread failure in the event of an earthquake, we suggest cautious use of ocean sediments in developing past histories of major earthquakes.


Mobilization of Tl-Hg-As-Sb-(Ag, Cu)-Pb sulfosalt melts during lowgrade metamorphism in the Alpi Apuane (Tuscany, Italy)
C. Biagioni et al. (M. D'Orazio, corresponding), Dipartimen
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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