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

f Mt. Shasta. The slide occurred between 12,000 and 21,000 years ago. The sonar mapping also revealed that 15 major subaqueous channel systems ring the lake and each extend several miles from near the shore to the flat lake bottom 1600 feet deep. These systems all contain giant ripple marks up to 400 yards from crest to crest. Such bedforms are common in submarine canyons where they are called sediment waves. The Tahoe sediment wave channel systems were fed by sheets of water up to two miles wide. They narrow downslope to an incised channel, which than terminates in a broad apron on the flat lake floor. These channels resemble recently mapped sediment wave channels that are forming where the Squamish River in British Columbia enters the ocean. Sediment in the river is deposited at the coast forming a delta, which becomes unstable, collapses, and feeds the sediment wave channels. All the Tahoe sediment wave channels formed at the same time as the landslide and were fed by the backwash from major tsunamis caused by water splashed out of the lake. The backwash of these tsunamis was equivalent to 15 major rivers flowing across the shoreline and would have decimated life in the lower Tahoe Basin.


Late Miocene erosion and evolution of topography along the western slope of the Colorado Rockies
Russell Rosenberg et al., Penn State University, Dept. of Geosciences, University Park, Pennsylvania 16802, USA. Published online 14 July 2014; http://dx.doi.org/10.1130/GES00989.1. Special series: Crevolution 2: Origin and Evolution of the Colorado River System II.

From the abstract: In the Colorado Rocky Mountains, the association of high topography and low seismic velocity in the underlying mantle suggests that recent changes in lithospheric buoyancy may have been associated with surface uplift of the range. This paper examines the relationships among late Cenozoic fluvi
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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