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

appone and colleagues report new experimental laboratory measurements of the seismic properties of a rock that occurs abundantly in the middle continental crust (metapelite), presenting evidence for phase transitions using elastic wave velocity methods. They argue that well-calibrated data relating the Vp to pressure and temperature on rocks representative of the middle crust are therefore the key to using this method as a diagnostic tool for determining temperature conditions at depth.


Erosion-induced isostatic rebound triggers extension in low convergent mountain ranges P. Vernant et al., Gosciences Montpellier, CNRS-Universit Montpellier 2, Montpellier 34095, France. Posted online 7 Feb. 2013; http://dx.doi.org/10.1130/G33942.1.

Earthquakes occur even in places where no deformation related to horizontal tectonic plate motion is expected. Among the regions where no present-day horizontal deformation can be quantified to the level of accuracy of GPS measurements (i.e., 0.3 mm/yr), the Alps and the Pyrenees mountain ranges (Western Europe) or the New Madrid area (USA) can be cited. In these areas, the causes for the recorded seismicity are puzzling to earth scientists. Here, P. Vernant and colleagues show that erosion of topography can lead to vertical motions, which in turn can create very low horizontal deformations and earthquakes. This implies that seismic hazard assessment for low strain rate areas needs to be revisited, because erosion-related earthquakes could increase seismic hazard.


Non-hotspot volcano chains produced by migration of shear-driven upwelling toward the East Pacific Rise Maxim D. Ballmer et al., Dept. of Geology and Geophysics, School of Ocean and Earth Sciences and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA. Posted online 7 Feb. 2013; http
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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