Index Catalog // ScholarsArchive@OSU

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

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

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:: Imaging Crustal Structure in Southwestern Washington With Small Magnetometer Arrays GARY D. EGBERT

Creator:: Barth, John A.
Abstract:: The stability of a coastal jet and front is investigated using the primitive equations applied to a continuously stratified flow in geostrophic balance. A linear stability analysis successfully explains the growth of two modes of instability with distinctly different horizontal scales. A long-wavelength mode (fastest-growing wavelength of 0(100 km)) is...
Resource Type:: Article
Full Text:: vertical velocity maximum (20 m d -• at 30 m) is associated with a frontal instability with a reasonable

Creator:: Pierce, Stephen D., Allen, John S., and Walstad, Leonard J.
Abstract:: The linear stability of a coastal transition zone (CTZ) jet is analyzed using a six-layer quasi-geostrophic model with observed basic state velocity profiles. The velocity profiles are obtained from objectively analyzed hydrographic and acoustic doppler data from the 1987 CTZ pilot experiment. Along-jet perturbation wave-lengths of 260-265 km are found...
Resource Type:: Article

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:: , 1992 Very Long Period Magnetotellurics at Tucson Observatory: Estimation of Impedances GARY D

Creator:: Braunmiller, Jochen and Nábělek, John
Abstract:: Teleseismic body waves from large earthquakes are used to study the downdip geometry of continental normal faults in the Aegean. Waveform modeling technique together with rigorous statistical tests are applied to put firm bounds on the amount of downdip curvature of these faults and the role of coseismic slip on...
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Full Text:: of continental normal faults: Seismological constraints Jochen Braunmiller and John NfibElek

Creator:: Seiff, Alvin, Tillman, James E., Murphy, James R., Schofield, John T., Crisp, David, Barnes, Jeffrey R., LaBaw, Clayton, Mahoney, Colin, Mihalov, John D., Wilson, Gregory R., and Haberle, Robert M.
Abstract:: An instrument on the Pathfinder lander has been designed to measure the structure of Mars’ atmosphere during spacecraft entry and descent from ~150 km altitude to the surface, and to measure meteorological parameters after landing for the landed duration of the mission. This is specified to be nominally 30 Mars...
Resource Type:: Article

Creator:: Allen, John S., Walstad, Leonard J., and Newberger, P. A.
Abstract:: The finite amplitude nonlinear behavior of the coastal transition zone (CTZ) jet, assumed to be governed by quasi-geostrophic dynamics, is studied utilizing numerical experiments in an idealized geometry. Finite difference solutions to initial value problems are obtained for a stratified, six-layer fluid in a periodic, flat bottom, f plane channel....
Resource Type:: Article

Creator:: Levine, Murray D., Padman, Laurie, Muench, Robin D., and Morison, James H.
Abstract:: The upper ocean current and temperature fields in the western Weddell Sea were measured from the drifting pack ice at Ice Station Weddell 1 (ISW) and nearby sites using a vertical profiler and an array of moored sensors in January–June 1992. These data document the structure and variability of the...
Resource Type:: Article
Full Text:: Weddell Murray D. Levine Lurie Pdrnn College of Oceanic and Atmospheric Sciences, Oregon State

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