Index Catalog // ScholarsArchive@OSU

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:: Subduction System in the EMSLAB Project JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 94, NO. B10, PAGES 14,111

Creator:: Tietze, Kristina, Ritter, Oliver, and Egbert, Gary D.
Abstract:: With advancing computational resources, 3-D inversion techniques have become feasible in recent years and are now a more widely used tool for magnetotelluric (MT) data interpretation. Galvanic distortion caused by small-scale near-surface inhomogeneities remains an obstacle for 3-D MT inversion which so far has experienced little attention. If not considered...
Resource Type:: Article
Full Text:: & Ritter (2013) and Becken et al. (2008, 2011). PT inversion results of Figs 11(d) and (e) were obtained

Creator:: Shum, C. K., Woodworth, P. L., Andersen, O. B., Egbert, Gary D., Francis, O., King, C., Klosko, S. M., Le Provost, C., Li, X., Molines, J-M., Parke, M. E., Ray, Richard D., Schlax, M. G., Stammer, D., Tierney, C. C., Vincent, P., and Wunsch, C. I.
Abstract:: Over 20 global ocean tide models have been developed since 1994, primarily as a consequence of analysis of the precise altimetric measurements from TOPEX/POSEIDON and as a result of parallel developments numerical tidal modeling and data assimilation. This paper provides an accuracy assessment of 10 such tide models and discusses...
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Full Text:: GEOPHYSICAL RESEARCH, VOL. 102, NO. Cll, PAGES 25,173-25,194, NOVEMBER 15, 1997 Accuracy assessment of

Creator:: Meqbel, Naser M., Egbert, Gary D., Wannamaker, Philip E., Kelbert, Anna, and Schultz, Adam
Abstract:: Long period (10–20,000 s) magnetotelluric (MT) data are being acquired across the continental USA on a quasi-regular grid of ∼70 km spacing as an electromagnetic component of the National Science Foundation EarthScope/USArray Program. These data are sensitive to fluids, melts, and other organic indicators, and thus provide a valuable complement...
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Full Text:: northwestern US derived from 3-D inversion of USArray magnetotelluric data Deep electrical resistivity

Creator:: Ray, Richard D. and Egbert, Gary D.
Abstract:: This study of the fortnightly Mf tide comprises three main topics: (1) a new determination of the fortnightly component of polar motion and length of day (LOD) from a multidecade time-series of observed space-geodetic data; (2) the use of the polar motion determination as one constraint in the development of...
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Full Text:: final 100 d of c20010701, which appear anomalous). The lack of pre-1980 data is of no concern because of

Creator:: Egbert, Gary D.
Abstract:: We describe novel hybrid algorithms for inversion of electromagnetic geophysical data, combining the computational and storage efficiency of a conjugate gradient approach with an Occam scheme for regularization and step-length control. The basic algorithm is based on the observation that iterative solution of the symmetric (Gauss-Newton) normal equations with conjugate...
Resource Type:: Article
Full Text:: separately. Note that WK WTK d̂ = d̂, and thus (20–21) imply that( JJT + λ0I ) bK = d̂ + eK+1, (22) Figure

Creator:: Egbert, Gary D.
Abstract:: I derive probability densities for virtual geomagnetic pole( VGP) longitudes for a general statistical model of local magnetic field variations. I show that even for very simple statistically homogeneous models of secular variation, the distribution of VGP longitudes is peaked 90° away from the sampling longitude. Thus, when sites are...
Resource Type:: Article
Full Text:: , VOL. 19, NO. 23, PAGES 2353-2356, DECEMBER 2, 1992 SAMPLING BIAS IN VGP LONGITUDES Gary D. Egbert

Creator:: Ray, Richard D. and Egbert, Gary D.
Abstract:: How and where the ocean tides dissipate their energy are longstanding questions with both oceanographic and astronomical implications. Two decades ago, Doake suggested that flexing of Antarctic ice shelves by the underlying ocean tide is an important energy sink, perhaps accounting for over half the global dissipation rate. Observational constraints...
Resource Type:: Article
Full Text:: RESEARCH LETTERS, VOL. 24, NO. 5, PAGES 543-546, MARCH 1, 1997 The flux of tidal energy across latitude

Creator:: Egbert, Gary D. and Ray, Richard D.
Abstract:: Tidal energy dissipation is estimated for eight semi‐diurnal and diurnal constituents using a global inverse solution constrained by TOPEX/Poseidon altimeter data. Very similar spatial patterns are obtained for all semi‐diurnal constituents, with about one third of the total dissipation occurring in the deep ocean over rough topography. Maps for diurnal...
Resource Type:: Article
Full Text:: TOPEX/Poseidon altimetry Gary D. Egbert College of Oceanic and Atmospheric Sciences, Oregon State

Creator:: Ray, Richard D. and Egbert, Gary D.
Abstract:: The small S₁ ocean tide is caused primarily by diurnal atmospheric pressure loading. Its excitation is therefore unlike any other diurnal tide; in particular, pressure loading is maximum near the equator where the diurnal gravitational potential is zero. The global character of the S₁ tide is here determined by numerical...
Resource Type:: Article
Full Text:: frequency, that is, the mean S1 tide. Note that the side peaks occur at AUGUST 2004 1925R A Y A N D E G B

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