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Estimating earthquake frequency and patterns in the Puget Lowland

ry fans in the Gulf of Alaska, and a key component in understanding regional sedimentation processes offshore of southeast Alaska and western Canada. Recently-collected seismic reflection data over the fan area provide new constraints on fan size, volume, channel development, and tectonic influences on deposition. We find the area and total sediment volume of the Baranof Fan to be 323,000 square kilometers and 301,000 cubic kilometers, respectively, making the Baranof Fan roughly the size of the Mississippi Fan and therefore among the largest deep-sea fans in the world. Three channel systems, including the newly mapped Baranof channel system, consistently decrease in age moving southward within the fan. Because the Baranof Fan is located along the Queen Charlotte strike-slip fault, we interpret that this southward-younging pattern of channel-levee deposits is due to the changing position of the Pacific plate relative to sediment sources on the North America plate through time. A tectonic model of fan development indicates that organized fan deposition may have initiated around seven million years ago.

Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: Correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot
Ray Wells et al., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025-3561, USA. Published online 14 July 2014;

Along Oregon and Washington's Cascadia subduction zone, the leading edge of North America consists of a voluminous oceanic basalt terrane similar to the Hawaiian Islands that collided with the continent about 50 million years ago. Ray Wells and colleagues document the eruptive and kinematic history of the accreted oceanic basalt basement (Siletzia) and a similar, sister Yakutat terrane in

Contact: Kea Giles
Geological Society of America

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Estimating earthquake frequency and patterns in the Puget Lowland
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