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Browsing by Author "Egbert, Gary D."
Now showing items 21-36 of 36
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Unsworth, Martyn; Egbert, Gary D.; Booker, John (American Geophysical Union, 1999-01-10)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 electrical ...
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Egbert, Gary D. (Royal Astronomical Society, 2012-07)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- ...
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Egbert, Gary D.; Booker, John R. (American Geophysical Union, 1993-09-10)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 p ...
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Balasis, Georgios; Egbert, Gary D.; Maus, Stefan (American Geophysical Union, 2004)The current satellite magnetic missions offer new opportunities to determine the electrical conductivity of the Earth. However, satellites are nearly stationary in local time and therefore sample the inducing and indu ...
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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; Green, A.W. (American Geophysical Union, 1989-10-10)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. Thi ...
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Kurapov, Alexander L.; Egbert, Gary D.; Allen, J. S.; Miller, Robert N.; Erofeeva, Svetlana Y.; Kosro, P. M. (American Meteorological Society, 2003-08)A linearized baroclinic, spectral-in-time tidal inverse model has been developed for assimilation of surface currents from coast-based high-frequency (HF) radars. Representer functions obtained as a part of the generaliz ...
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Springer, S. R.; Samelson, Roger M.; Allen, John S.; Egbert, Gary D.; Kurapov, Alexander; Miller, Robert N.; Kindle, J. C. (American Geophysical Union, 2009-02-13)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 upw ...
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Numerical modeling of the global semidiurnal tide in the present day and in the last glacial maximum Egbert, Gary D.; Ray, Richard D.; Bills, Bruce G. (American Geophysical Union, 2004)A hydrodynamic model incorporating a self-consistent treatment of ocean selfattraction and loading (SAL), and a physically based parameterization of internal tide (IT) drag, is used to assess how accurately barotropic ...
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Arason, Pórdur (1991-04-18)In this thesis anomalous downcore shallowing of paleomagnetic inclinations is interpreted to be caused by sediment compaction. Thus, compaction-induced inclination shallowing may influence tectonic reconstructions tha ...
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Patro, Prasanta K.; Egbert, Gary D. (American Geophysical Union, 2008)In conjunction with the USArray component of EarthScope, long period magnetotelluric (MT) data are being acquired in a series of arrays across the continental US. Initial deployments in 2006 and 2007 acquired data (10 ...
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Egbert, Gary D. (1992-12-02)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 secu ...
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Egbert, Gary D.; Ray, Richard D. (American Geophysical Union, 2003)Tidal energy dissipation is estimated for eight semidiurnal and diurnal constituents using a global inverse solution constrained by TOPEX/Poseidon altimeter data. Very similar spatial patterns are obtained for all sem ...
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Erofeeva, Svetlana Y.; Egbert, Gary D.; Kosro, P. Michael, 1951- (American Geophysical Union, 2003)Measurements of tidal currents on the central Oregon shelf are available from several sources, including recent high frequency (HF) coastal radar and Acoustic Doppler Profiler (ADP) deployments, and historical current ...
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Egbert, Gary D.; Bennett, Andrew F.; Foreman, Michael G. G. (American Geophysical Union, 1994-12-15)Altimetric data from the TOPEX/POSEIDON mission will be used for studies of global ocean circulation and marine geophysics. However, it is first necessary to remove the ocean tides, which are aliased in the raw data. The ...
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Egbert, Gary D.; Booker, John R.; Schultz, Adam (American Geophysical Union, 1992-10-10)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 u ...
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Egbert, Gary D.; Booker, John R. (American Geophysical Union, 1992-10-10)
Now showing items 21-36 of 36
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