Index Catalog // ScholarsArchive@OSU

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Creator:: Wannamaker, Philip E., Booker, John R., Filloux, Jean H., Jones, Alan G., Jiracek, George R., Chave, Alan D., Tarits, Pascal, Waff, Harve S., Egbert, Gary D., Young, Charles T., Stodt, John A., Martinez, Mario G., Law, Lawrie K., Yukutake, Takesi, Segawa, Jiro S., White, Anthony, and Green, A.W.
Abstract:: A magnetotelluric (MT)transect has been obtained near latitude 45øN from the active Juan de Fuca Spreading center, across the subduction zone and Cascades volcanic arc, and into the back arc Deschutes Basin region. This paper presents the MT data set and describes its major characteristics as they pertain to the...
Resource Type:: Article
Full Text:: . JIRACEK, ALAN D. CtIAVE, PASCAL TARITS, HARVE S. WAFF, GARY D. EGBERT, CHARLES t. YOUNG, JoHN A. STODT

Very long period magnetotellurics at Tucson Observatory: implications for mantle conductivity

Creator:: Egbert, Gary D. and Booker, John R.
Abstract:: In a companion paper (Egbert et al., this issue) we describe the estimation of very long period (0.16 < T < 91 days) magnetotelluric (MT) impedances from 11 years of data collected at the Tucson geomagnetic observatory. Here we discuss the implications of these data for mantle conductivity. Using minimum...
Resource Type:: Article
Full Text:: Conductivity GARY D. EGBERT College of Oceanography, Oregon State University, Corvallis JOHN R. BOOKER

Very long period magnetotellurics at Tucson Observatory: estimation of impedances

Creator:: Egbert, Gary D., Booker, John R., and Schultz, Adam
Abstract:: Eleven years (1932-1942) of electric potential and magnetic measurement at the Tucson observatory represent a unique very long period magnetotelluric (MT) data set. We report here on a careful reanalysis of this data using modern processing techniques. We have developed and used novel methods for separating out the quasi-periodic daily...
Resource Type:: Article
Full Text:: (Tk), (6) where Zo(T) is the undistorted scalar one-dimensional impedance, and Dii, i, j = 1, 2 are

Imaging crustal structure in southwestern Washington with smalll magnetometer arrays

Creator:: Egbert, Gary D. and Booker, John R.
Abstract:: We use data from a series of small (three to five stations) overlapping magnetovariational (MV) arrays to image variations of vertically integrated electrical conductivity in the crust of southwestern Washington. Two principal structures are revealed: a large north-south trending anomaly (the southern Washington Cascades Conductor (SWCC), which has been detected...
Resource Type:: Article
Full Text:: /l/i ' ' ' ''--•' L ••'•''''.9q5 • .... ' J ,(•'•,,-''))&) ..... .... I' I ' ' ?? t•t_

High-resolution electromagnetic imaging of the San Andreas fault in Central California

Creator:: Unsworth, Martyn, Egbert, Gary D., and Booker, John
Abstract:: Although there is increasing evidence that fluids may play a significant role in the earthquake rupture process, direct observation of fluids in active fault zones remains difficult. Since the presence of an electrically conducting fluid, such as saline pore water, strongly influences the overall conductivity of crustal rocks, electrical and...
Resource Type:: Article
Full Text:: and Atmospheric Sciences, Oregon State University, Corvallis John Booker Geophysics Program

A nested grid model of the Oregon Coastal Transition Zone: Simulations and comparisons with observations during the 2001 upwelling season

Creator:: Springer, S. R., Samelson, Roger M., Allen, John S., Egbert, Gary D., Kurapov, Alexander, Miller, Robert N., and Kindle, J. C.
Abstract:: The Oregon Coastal Transition Zone (OCTZ) extends several hundred kilometers offshore where shelf flows interact with the northern California Current. A primitive-equation numerical ocean model is used to study the upwelling circulation in this region from 1 May to 1 November 2001. This OCTZ model obtains initial and boundary conditions...
Resource Type:: Article
Full Text:: . Springer,1,2 R. M. Samelson,1 J. S. Allen,1 G. D. Egbert,1 A. L. Kurapov,1 R. N. Miller,1 and J. C

Assimilation of moored velocity data in a model of coastal wind-driven circulation off Oregon: Multivariate capabilities

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...
Resource Type:: Article
Full Text:: , G. D. Egbert, R. N. Miller, P. M. Kosro, M. D. Levine, T. Boyd, and J. A. Barth College of Oceanic

Distant effect of assimilation of moored currents into a model of coastal wind-driven circulation off Oregon

Creator:: Kurapov, Alexander, Allen, John S., Egbert, Gary D., Miller, Robert N., Kosro, P. Michael, Levine, Murray D., and Boyd, Timothy John, 1958-2013
Abstract:: An optimal interpolation (OI) sequential algorithm is implemented for a three-dimensional primitive equation model to assimilate current measurements from acoustic Doppler profilers moored on the Oregon shelf as a part of the Coastal Ocean Advances in Shelf Transport (COAST) upwelling experiment (May–August 2001). A stationary estimate of the forecast error...
Resource Type:: Article
Full Text:: into a model of coastal wind-driven circulation off Oregon Alexander L. Kurapov, J. S. Allen, G. D

Assimilation of surface velocity data into a primitive equation coastal ocean model

Creator:: Oke, Peter R., Allen, John S., Miller, Robert N., Egbert, Gary D., and Kosro, P. Michael, 1951-
Abstract:: A data assimilation system (DAS) of the wind‐driven, mesoscale shelf circulation off the Oregon coast is developed. The DAS assimilates low‐pass filtered surface velocity measurements, obtained from land‐based high‐frequency coastal radar arrays, into a primitive equation coastal ocean model using a sequential optimal interpolation scheme. Inhomogeneous and anisotropic estimates of...
Resource Type:: Article
Full Text:: primitive equation coastal ocean model Peter R. Oke,1 J. S. Allen, Robert N. Miller, Gary D. Egbert, and P

Deviation of Long-Period Tides from Equilibrium: Kinematics and Geostrophy

Creator:: Egbert, Gary D. and Ray, Richard D.
Abstract:: New empirical estimates of the long-period fortnightly (Mf) tide obtained from TOPEX/Poseidon (T/P) altimeter data confirm significant basin-scale deviations from equilibrium. Elevations in the low-latitude Pacific have reduced amplitude and lag those in the Atlantic by 308 or more. These interbasin amplitude and phase variations are robust features that are...
Resource Type:: Article
Full Text:: empirical estimates of the long-period fortnightly (Mf) tide obtained from TOPEX/Poseidon (T/P) al- timeter

ScholarsArchive@OSU

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Very long period magnetotellurics at Tucson Observatory: implications for mantle conductivity

Very long period magnetotellurics at Tucson Observatory: estimation of impedances

Imaging crustal structure in southwestern Washington with smalll magnetometer arrays

High-resolution electromagnetic imaging of the San Andreas fault in Central California

A nested grid model of the Oregon Coastal Transition Zone: Simulations and comparisons with observations during the 2001 upwelling season

Assimilation of moored velocity data in a model of coastal wind-driven circulation off Oregon: Multivariate capabilities

Distant effect of assimilation of moored currents into a model of coastal wind-driven circulation off Oregon

Assimilation of surface velocity data into a primitive equation coastal ocean model

Deviation of Long-Period Tides from Equilibrium: Kinematics and Geostrophy

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