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Catastrophic debris avalanches -- a second volcanic hazard
Date:7/18/2014

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Arroyo channel head evolution in a flash-flooddominated discontinuous ephemeral stream system
Stephen B. DeLong et al., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA. Published online 16 July 2014; http://dx.doi.org/10.1130/B31064.1.

Land managers in drylands across the world are challenged by rapidly eroding gullies and arroyos. Abrupt transitions from flat ground that conveys flood water as slow, wide, shallow flows to deeply eroding channels that convey water rapidly through the landscape have profound negative effects on rangeland quality. Surprisingly little is known about how the heads of arroyo channels erode and why their shapes mimic larger theater-shaped bedrock channel heads on Earth and other planets. Stephen B. DeLong and colleagues, by deploying a wide range of sensor technology, have illuminated the importance of surface floods both deep and shallow in causing erosion and expansion of these gully systems and conclude that water moving through the shallow subsurface and seeping out at steep channel heads, long thought to be a primary cause of theater-shaped channel heads, does not appear to be a necessary, or even common occurrence, in the studied landscape.


Crustal attenuation as a tracer for the emplacement of the Beni Bousera ultramafic massif (Betico-Rifean belt)
A.M. lvarez-Valero et al., Dept. of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge Massachusetts, USA. Published online 30 June 2014; http://
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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