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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:: : Estimation of Impedances JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 97, NO. Bll, PAGES 15,113-15,128, OCTOBER 10

Records of geomagnetic reversals from volcanic islands of French Polynesia 1. Paleomagnetic study of a polarity transition in a lava sequence from the island of Huahine

Creator:: Roperch, Pierrick and Duncan, Robert A.
Abstract:: We report the behavior of the earth's magnetic field for a transition recorded in lavas at the volcanic island of Huahine in French Polynesia, south-central Pacific Ocean. Detailed intermediate fields are observed that record an apparent N-N excursion. The available K-Ar ages indicate that most volcanic rocks of the southern...
Resource Type:: Article
Full Text:: Huahine JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 95, NO. B3, PAGES 2713-2726, MARCH 10, 1990 Records of

Mapping tropical Pacific sea level: Data assimilation via a reduced state space Kalman filter

Creator:: Cane, Mark A., Kaplan, Alexey, Miller, Robert N., Tang, Benyang, Hackert, Eric C., and Busalacchi, Anthony J.
Abstract:: The well-known fact that tropical sea level can be usefully simulated by linear wind driven models recommends it as a realistic test problem for data assimilation schemes. Here we report on an assimilation of monthly data for the period 1975-1992 from 34 tropical Pacific tide gauges into such a model...
Resource Type:: Article
Full Text:: reduced state space Kalman filter JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 101, NO. C10, PAGES 22,599

Petrology and Geochemistry of the Galápagos Islands : portrait of a pathological mantle plume

Creator:: White, William M., McBirney, Alexander R., and Duncan, Robert A.
Abstract:: We report new major element, trace element, isotope ratio, and geochronological data on the Galapagos Archipelago. Magmas erupted from the large western volcanos are generally moderately fractionated tholeiites of uniform composition; those erupted on other islands are compositionally diverse, ranging from tholeiites to picritic basanitoids. While these volcanoes do not...
Resource Type:: Article
Full Text:: : Portrait of a Pathological Mantle Plume JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 98, NO. Bll, PAGES 19,533

Ozone fluxes over a patchy cultivated surface

Creator:: Mahrt, Larry, Lenschow, D. H., Sun, Jielun, Weil, J. C., MacPherson, J. I., and Desjardins, R. L.
Abstract:: This study examines the spatial variability of ozone fluxes over flat heterogeneous terrain consisting of a patchwork of irrigated and nonirrigated surfaces. Fluxes of ozone and other quantities are computed from eight sequential flight legs of the Canadian Twin Otter research aircraft over the same track at 33 m above...
Resource Type:: Article
Full Text:: GEOPHYSICAL RESEARCH, VOL. 100, NO. Dll, PAGES 23,125-23,131, NOVEMBER 20, 1995 Ozone fluxes over a patchy

Evidence for diffuse exension of the Pacific plate from Pukapuka ridges and cross-grain gravity lineations

Creator:: Sandwell, David T., Winterer, Edward L., Mammerickx, Jacqueline, Duncan, Robert A., Lynch, Mary Ann, Levitt, Daniel A., and Johnson, Catherine L.
Abstract:: Satellite altimeter measurements of marine gravity reveal 100 to 200-km wavelength lineations over a wide area of the Pacific plate oriented roughly in the direction of absolute plate motion. At least three mechanisms have been proposed for their origin: smallscale convective rolls aligned in the direction of absolute plate motion...
Resource Type:: Article
Full Text:: Pukapuka ridges and cross‐grain gravity lineations JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 100, NO

Records of geomagnetic reversals from volcanic islands of French Polynesia 2. Paleomagnetic study of a flow sequence (1.2-0.6 Ma) from the island of Tahiti and discussion of reversal models

Creator:: Chauvin, Annick, Roperch, Pierrick, and Duncan, Robert A.
Abstract:: A volcanic sequence almost 700 meters thick has been sampled in the Punaruu valley on the island of Tahiti, southern central Pacific Ocean. Detailed paleomagnetic results have been obtained from 123 sites. Three reversals are recorded in this sequence. Age determinations (K-Ar) indicate that the youngest reversal corresponds to the...
Resource Type:: Article
Full Text:: of Tahiti and Discussion of Reversal Models JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 95, NO. B3, PAGES

Tahiti: Geochemical evolution of a French Polynesian volcano

Creator:: Duncan, Robert A., Fisk, Martin R., White, William M., and Nielsen, Roger L.
Abstract:: The island of Tahiti, the largest in French Polynesia, comprises two major volcanoes aligned NW-SE, parallel with the general trend of the Society Islands hotspot track. Rocks form this volcanic system are basalts transitional to tholeiites, alkali basalts, basanites, picrites, and evolved lavas. Through K-Ar radiometric dating we have established...
Resource Type:: Article
Full Text:: JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 99, NO. B12, PAGES 24,341-24,357, DECEMBER 10, 1994 Tahiti

Near-surface trajectories off central and southern California

Creator:: Winant, C. D., Alden, D. J., Dever, Edward P., Edwards, K. A., and Hendershott, M. C.
Abstract:: The near-surface circulation in the Santa Barbara Channel and off the coast of central and southern California is described based on 20 releases of drifters drogued 1 m beneath the surface from 12 sites within the channel at bimonthly intervals. This description includes small-scale features of the circulation which are...
Resource Type:: Article
Full Text:: California JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 104, NO. C7, PAGES 15,713-15,726, JULY 15, 1999

Surface heat flux variability over the northern California shelf

Creator:: Beardsley, Robert C., Denver, Edward P., Lentz, Steven J., and Dean, Jerome P.
Abstract:: Surface heat flux components are estimated at a midshelf site over the northern California shelf using moored measurements from the 1981-1982 Coastal Ocean Dynamics Experiment (CODE) and the 1988-1989 Shelf Mixed Layer Experiment (SMILE). Time series of estimated fluxes extend from early winter through summer upwelling conditions, allowing examination of...
Resource Type:: Article
Full Text:: shelf JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 103, NO. C10, PAGES 21,553-21,586, SEPTEMBER 15, 1998

ScholarsArchive@OSU

Very long period magnetotellurics at Tucson Observatory: estimation of impedances

Records of geomagnetic reversals from volcanic islands of French Polynesia 1. Paleomagnetic study of a polarity transition in a lava sequence from the island of Huahine

Mapping tropical Pacific sea level: Data assimilation via a reduced state space Kalman filter

Petrology and Geochemistry of the Galápagos Islands : portrait of a pathological mantle plume

Ozone fluxes over a patchy cultivated surface

Evidence for diffuse exension of the Pacific plate from Pukapuka ridges and cross-grain gravity lineations

Records of geomagnetic reversals from volcanic islands of French Polynesia 2. Paleomagnetic study of a flow sequence (1.2-0.6 Ma) from the island of Tahiti and discussion of reversal models

Tahiti: Geochemical evolution of a French Polynesian volcano

Near-surface trajectories off central and southern California

Surface heat flux variability over the northern California shelf

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