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Estimating earthquake frequency and patterns in the Puget Lowland
Date:7/17/2014

al incision, channel steepness, and mantle velocity domains along the western slope of the northern Colorado Rockies. New 40Ar/39Ar ages on basalts capping the Tertiary Browns Park Formation range at about six to 11 million years old (Ma) and provide markers from which we reconstruct incision along the White, Yampa, and Little Snake rivers. The magnitude of post-10 Ma incision varies systematically from north to south, increasing from ∼500 m along the Little Snake River to ∼1500 m along the Colorado River. Spatial variations in the amount of late Cenozoic incision are matched by metrics of channel steepness; the upper Colorado River and its tributaries (e.g., Gunnison and Dolores rivers) are two to three times steeper than the Yampa and White rivers, and these variations are independent of both discharge and lithologic substrate. The coincidence of steep river profiles with deep incision suggests that the fluvial systems are dynamically adjusting to an external forcing but is not readily explained by a putative increase in erosivity associated with late Cenozoic climate change. Rather, channel steepness correlates with the position of the channels relative to low-velocity mantle. We suggest that the history of late Miocene-present incision and channel adjustment reflects long-wavelength tilting across the western slope of the Rocky Mountains.


Dynamic response to strike-slip tectonic control on the deposition and evolution of the Baranof Fan, Gulf of Alaska
Maureen A.L. Walton, et al., Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, J.J. Pickle Research Campus Building 196, 10100 Burnet Road, Austin, Texas 78758-4445, USA. Published online 14 July 2014; http://dx.doi.org/10.1130/GES001034.1. Special series: Exploring the Deep Sea and Beyond, Volume 2.

The Baranof Fan is one of three deep-sea sedimenta
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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