Index Catalog // ScholarsArchive@OSU

Creator:: Duncan, Robert A.
Abstract:: K-Ar and ⁴⁰Ar-³⁹Ar geochronologic data reveal the Paleocene to Eocene eruptive history of volcanic centers which produced the basaltic basement rocks of the Coast Range of Oregon and Washington. Volcanism was short lived at each center and migrated with time from the northern and southern ends toward the center, near...
Resource Type:: Article
Full Text:: CAPTURED ISLAND CHAIN IN THE COAST RANGE OF OREGON AND WASHINGTON Robert A. Duncan School of

Creator:: Duncan, Robert A.
Abstract:: Radiometric ages (K-Ar and ⁴⁰Ar- ³⁹Ar methods) have been determined on dredged volcanic rocks from seven of the New England Seamounts, a prominent northwest-southeast trending volcanic lineament in the northwestern Atlantic Ocean. The ⁴⁰Ar-³⁹Ar total fusion and incremental heating ages show an increase in seamount construction age from southeast to...
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Full Text:: - sitions of the oceanic crust produ6•d should bear the imprint of the hot spot mantick,source mate- rial

Creator:: Miller, Robert N.
Abstract:: A series of observing system simulation experiments (OSSE) is performed on a simulated data set which was designed to mimic the wind-forced response of the tropical Pacific ocean. This data set was constructed by adding random perturbations to the FSU monthly mean pseudostress anomaly data. These perturbed pseudostress anomaly fields...
Resource Type:: Article
Full Text:: ROBERT N. MILLER College of Oceanography, Oregon State University, Corvallis A series of observing

Creator:: Splinter, Kristen D., Holman, Robert A., and Plant, Nathaniel G.
Abstract:: A nonlinear model is developed to study the time‐dependent relationship between the alongshore variability of a sandbar, a(t), and alongshore‐averaged sandbar position, xc(t). Sediment transport equations are derived from energetics‐based formulations. A link between this continuous physical representation and a parametric form describing the migration of sandbars of constant shape...
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Full Text:: migration and 2DH evolution Kristen D. Splinter,1,2 Robert A. Holman,1 and Nathaniel G. Plant3 Received 29

Creator:: Padman, Laurie, Levine, Murray D., Dillon, Thomas, Morison, James, and Pinkel, Robert
Abstract:: Hydrographic and velocity profiles were made through a small baroclinic cyclonic eddy during the Arctic Internal Wave Experiment in the Canada Basin in April 1985. The maximum measured azimuthal velocity was 0.38 m s⁻¹ at a depth of 115 m, with velocities decaying to near zero at 30 and 270...
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Full Text:: Washington, Seattle ROBERT PINKEL Scripps Institution of Oceanography, La Jolla, California

Creator:: Foster, D. L., Bowen, A. J., Holman, Robert A., and Natoo, P.
Abstract:: Recently, models for the onshore migration of nearshore sandbars were improved by including an empirical acceleration term in the sediment transport formulation (Hoefel and Elgar, 2003). Here, field observations of the fluid-sediment interface suggest that the success of this empirical parameter may result from unsteady forcing of sediment beds by...
Resource Type:: Article
Full Text:: incipient motion D. L. Foster,1 A. J. Bowen,2 R. A. Holman,3 and P. Natoo1 Received 31 December 2004

Creator:: Foster, D. L., Beach, R. A., and Holman, Robert A.
Abstract:: Field observations of turbulence and sediment suspension in the nearshore wave bottom boundary layer obtained during the Duck94 field experiment on the North Caroline coast showed the generation of near-bed turbulence to be highly intermittent. The intermittent nature of the flow was examined by applying homogeneous isotropic turbulence laws over...
Resource Type:: Article
Full Text:: bottom boundary layer D. L. Foster,1 R. A. Beach,2 and R. A. Holman3 Received 25 January 2005; revised

Creator:: Pyle, D. G., Christie, David M., Mahoney, J. J., and Duncan, Robert A.
Abstract:: Within the Australian-Antarctic Discordance (AAD), a boundary exists between isotopically defined “Pacific-type” and “Indian-type” mid-ocean ridge basalt (MORB) erupted along the Southeast Indian Ridge (SEIR). This boundary has migrated westward beneath the easternmost AAD spreading segment at a minimum rate of 25 mm/yr since 4 Ma; however, its long-term history...
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Full Text:: seafloor D. G. Pyle and D. M. Christie College of Oceanic and Atmospheric Sciences, Oregon State

Creator:: Kurapov, Alexander, Allen, John S., Egbert, Gary D., Miller, Robert N., Kosro, P. Michael, Levine, Murray D., and Barth, John A.
Abstract:: Horizontal current measurements from an array of moored acoustic Doppler profilers are assimilated sequentially into a model of coastal wind-driven circulation off Oregon during the upwelling season of May–August 2001. Model results are compared against independent moored and ship survey data to document a positive effect of velocity data assimilation...
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Full Text:: , G. D. Egbert, R. N. Miller, P. M. Kosro, M. D. Levine, T. Boyd, and J. A. Barth College of Oceanic

Creator:: Goldfinger, Chris, Kulm, LaVerne D., Yeats, Robert S., McNeill, Lisa, and Hummon, Cheryl
Abstract:: At least nine WNW trending left-lateral strike-slip faults have been mapped on the Oregon-Washington continental margin using sidescan sonar, seismic reflection, and bathymetric data, augmented by submersible observations. The faults range in length from 33 to 115 km and cross much of the continental slop. Five faults offset both the...
Resource Type:: Article
Full Text:: Oblique strike-slip faulting of the central Cascadia submarine forearc Chris Goldfinger and LaVeme D

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