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Date:7/17/2012

per by David E. Haddad and colleagues is to demonstrate how laser scanning, also known as LiDAR, can be applied in paleoseismic research to measure the magnitude and extent of past large earthquakes. The paper presents three case studies that include millimeter-scale imaging of sedimentary deposits and faults in paleoseismic trenches, measuring decadal-scale erosion rates of fault scarps, and high-resolution imaging of precariously balanced rocks. All case studies show that laser scanning is an effective analytical tool for documenting past earthquakes and has the potential for being an integral component of the paleoseismic toolbox.


Miocene basin development and volcanism along a strike-slip to flat-slab subduction transition: stratigraphy, geochemistry, and geochronology of the central Wrangell volcanic belt, Yakutat-North America collision zone
Jeffrey Michael Trop et al., Bucknell University, Dept. of Geology, 701 Moore Avenue, Lewisburg, Pennsylvania 17837, USA. Posted online 16 July 2012; doi: 10.1130/GES762.1.

The Wrangell volcanic belt extends more than 500 km across eastern Alaska, northwestern British Columbia, and southwestern Yukon Territory and makes up much of the high topography of the Wrangell-St. Elias Mountains, including ice-capped volcanoes with elevations exceeding 4600 m. Volcanism, mountain building, and sedimentary basin development resulted in the deposition of diverse volcanic and sedimentary rocks and was driven by subduction of oceanic crust and collision of crustal fragments against the North American continent. Jeff Trop of Bucknell University and colleagues have obtained extensive field and analytical data from the essentially unexplored central part of the volcanic belt to better constrain the timing and nature of tectonic processes and landscape evolution. They integrate their new datasets with previous studies from the western and eastern parts of the volcanic belt to present a tectonic mod
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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