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Date:7/12/2013

enic zone
Christie D. Rowe et al., School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK. First published on 3 July 2013, http://dx.doi.org/10.1130/G34556.1.

How thick is a plate boundary fault in a subduction zone, and does it grow with depth? A compilation of 18 measurements from active and ancient subduction thrust faults around the world shows that subduction thrust faults form one or more high-strain strands about 5-35 m thick. Earthquakes and interseismic creep take place on these strands. If there is more than one strand, they may be braided through a section ~100-350 m thick. Thicker faults may have more strands but the thickness of individual fault strands is the same. This means subduction thrust faults don't grow gradually by incorporating more wallrock, as has been previously suggested to explain thick mlange units. Instead, kilometers-thick mlanges must form by accumulation through time, and by off-fault deformation. The faults are too thin to allow buoyant "backflow" from depth as has been suggested to explain mlanges containing high-pressure metamorphic rocks.


Rapid coastal subsidence in the central Ganges-Brahmaputra Delta (Bangladesh) since the 17th century deduced from submerged salt-producing kilns
Till J.J. Hanebuth et al., MARUMCenter for Marine Environmental Sciences, University of Bremen, Leobener Strasse, 28359 Bremen, Germany. First published on 3 July 2013, http://dx.doi.org/10.1130/G34646.1.

The densely populated low-lying Ganges-Brahmaputra Delta is highly vulnerable to the global sea-level rise. In order to estimate the subsidence of the delta over historical time scales, as a complement to existing entire-Holocene or modern data, we examined submerged salt-producing kiln sites in the coastal Sundarbans.
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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