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

Alaska. They correlate new Siletzia isotopic ages, nannofossil zones and magnetic polarities to the 2012 global timescale and construct a plate motion model for the northeast Pacific basin. Wells and colleagues demonstrate a common origin for the terranes at the Yellowstone hotspot offshore, their rapid accretion to the continent, and magmatic rejuvenation of Siletzia as the leading edge of North America overrode the hotspot 42 million years ago. Subsequent large-scale clockwise rotation of the Pacific Northwest has rotated Siletzia about 250 km northward off the hotspot track.


Graphite reaction weakening of fault rocks, and uplift of the Annapurna Himal, central Nepal
D. Craw and P. Upton, Geology Dept., University of Otago, PO Box 56, Dunedin 9054, New Zealand, and GNS Science, PO Box 30368, Lower Hutt 5040, New Zealand. Published online 14 July 2014; http://dx.doi.org/10.1130/GES001056.1.

This article shows that chemical processes in fault zones can lead to deposition of the carbon mineral graphite, which is a lubricant. Graphite-rich fault rocks can focus and enhance the sliding processes of rocks during earthquakes. Our example of a fault in the Himalaya has assisted in uplift of one of the world's highest mountains, Annapurna. Uplift movement on the graphite-lubricated fault has resulted in an extremely steep topographic step on the north side of the mountain. Graphite accumulation in the fault has also limited the natural discharge of greenhouse gases to the atmosphere.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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