Part 1. Hawaiian Hotspot Track Objective: Observation of the age of The islands are an example of a hotspot track. Ages of volcanic Objective: Observation of the age of volcanic rocks in the Hawaiian Island-Emperor Seamount Chain provides data to estimate the direction and velocity of plate motion of the Pacific plate over a fixed mantle hotspot.
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Volume Article Contents Abstract. A new GPS velocity field for the Pacific Plate — Part 1: constraints on plate motion, intraplate deformation, and the viscosity of Pacific basin asthenosphere. DeMets , C. E-mail: chuck geology. Oxford Academic. Enrique Cabral-Cano. Revision received:. Cite Cite C. Select Format Select format.
Permissions Icon Permissions. Abstract We combine new, well-determined GPS velocities from Clarion, Guadalupe and Socorro islands on young seafloor in the eastern Pacific basin with newly estimated velocities for 26 GPS sites from older seafloor in the central, western and southern parts of the Pacific Plate to test for deformation within the interior of the Pacific Plate and estimate the viscosity of the asthenosphere below the plate.
Plate motions , Rheology: mantle , Pacific Ocean. Open in new tab Download slide. Table 1. Open in new tab. Table 2. Best-fitting Pacific Plate angular velocity. Angular velocity. Table 3. Earthquake information for viscoelastic modelling. Google Scholar Crossref. Search ADS. Postglacial uplift and subsidence of Earth's surface using VLBI geodesy: on establishing vertical reference.
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Pacific-North America plate motions: new results from very long baseline interferometry. Willis, P. Precise point positioning for the efficient and robust analysis of GPS data from large networks. Issue Section:. Download all slides. Supplementary data. Supplementary Data - zip file. View Metrics. Email alerts Article activity alert. Advance article alerts. New issue alert. In progress issue alert. Subject alert. Receive exclusive offers and updates from Oxford Academic.
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GPS determined coseismic slip of the Mw7. Kanamori Abe Schwartz et al. Shimazaki Mendoza et al. Velasco et al. Pritchard et al. Hutton et al. Koketsu et al. Banerjee et al.
Tang et al. Lay et al. Furlong et al. Sladen et al. It was subducted beneath California leaving the San Andreas fault system behind as the contact between the North America and Pacific plates. The Juan de Fuca Plate is still actively subducting beneath N. Its motion is not smooth, but rather sticky; strain builds up until the fault breaks and a few meters of Juan De Fuca slips under North America in a big Megathrust earthquake.
This action takes place along the interface between the plates from the Juan de Fuca Trench offshore down-dip until the fault is too weak to store up any elastic stress. The locked zone varies in width from a few tens of kilometers km along the Oregon coast to perhaps a hundred km or more off of Washington's Olympic Peninsula, and is about 1, km long.
These plate motions are the primary source of strain in the lithosphere that lead to earthquakes in our region. In California, much of the strain generated by the grinding of the Pacific Plate against North America is taken up in earthquakes on the San Andreas Fault and related structures, but the shearing action doesn't end there. This block of crust is rotated west and pushed north into Washington state. British Columbia, however, is part of rigid North America and moves with it.
This results in the Puget Lowland being compressed and warped like an accordion with alternating uplifted and down warped terrain shortening the distance between Centralia, Washington, and the Canadia border. Shoveling off all the sedimentary deposits from the basement rocks underlying the Puget Lowland would certainly be one way to reveal this pattern.
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