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Correction to “Rheology of the lithosphere: Selected topics” Correction to “Rheology of the lithosphere: Selected topics”
No abstract available.
Authors
Stephen H. Kirby, A. K. Kronenberg
I. Thermal evolution of Ganymede and implications for surface features. II. Magnetohydrodynamic constraints on deep zonal flow in the giant planets. III. A fast finite-element algorithm for two-dimensional photoclinometry I. Thermal evolution of Ganymede and implications for surface features. II. Magnetohydrodynamic constraints on deep zonal flow in the giant planets. III. A fast finite-element algorithm for two-dimensional photoclinometry
The work is divided into three independent papers: PAPER I: Thermal evolution models are presented for Ganymede, assuming a mostly differentiated initial state of a water ocean overlying a rock layer. The only heat sources are assumed to be primordial heat (provided by accretion) and the long-lived radiogenic heat sources in the rock component. As Ganymede cools, the ocean thins, and two...
Authors
Randolph L. Kirk
Snow and ice studies by thematic mapper and multispectral scanner Landsat images Snow and ice studies by thematic mapper and multispectral scanner Landsat images
Digitally enhanced Landsat Thematic Mapper (TM) images of Antarctica reveal snow and ice features to a detail never seen before in satellite images. The six TM reflective spectral bands have a nominal spatial resolution of 30 m, compared to 80 m for the Multispectral Scanner (MSS). TM bands 2–4 are similar to the MSS bands. TM infra-red bands 5 and 7 discriminate better between clouds...
Authors
Olav Orheim, Baerbel K. Lucchitta
Thermal evolution of a differentiated Ganymede and implications for surface features Thermal evolution of a differentiated Ganymede and implications for surface features
Thermal evolution models are presented for Ganymede, assuming a mostly differentiated initial state of a water ocean overlying a rock layer. The only heat sources are assumed to be primordial heat (provided by accretion) and the long-lived radiogenic heat sources in the rock component. As Ganymede cools, the ocean thins, and two ice layers develop, one above composed of ice I, and the...
Authors
Randolph L. Kirk, David J. Stevenson
Hydromagnetic constraints on deep zonal flows in the giant planets Hydromagnetic constraints on deep zonal flows in the giant planets
The observed zonal flows of the giant planets will, if they penetrate below the visible atmosphere, interact significantly with the planetary magnetic field outside the metallized core. The appropriate measure of this interaction is the Chandrasekhar number Q = H^2 /4πρνα^2 λ (H = radial component of the magnetic field, ν = eddy viscosity, λ = magnetic diffusivity, α^-1 = length scale on...
Authors
Randolph L. Kirk, David J. Stevenson
On the aftershock sequence of the earthquake of January 31, 1986 in northeastern Ohio; effects of bandwidth and local geology on observed high-frequency ground motion On the aftershock sequence of the earthquake of January 31, 1986 in northeastern Ohio; effects of bandwidth and local geology on observed high-frequency ground motion
No abstract available.
Authors
Roger D. Borcherdt, G. Glassmoyer
Passive margins: U.S. Geological Survey Line 19 across the Georges Bank basin Passive margins: U.S. Geological Survey Line 19 across the Georges Bank basin
Georges Bank is a shallow part of the Atlantic continental shelf southeast of New England (Emery and Uchupi, 1972, 1984). This bank, however, is merely the upper surface of several sedimentary basins overlying a block-faulted basement of igneous and metamorphic crystalline rock. Sedimentary rock forms a seaward-thickening cover that has accumulated in one main depocenter and several...
Authors
Kim D. Klitgord, John S. Schlee, John A. Grow
Volcanism in Hawaii Volcanism in Hawaii
No abstract available.
Some effects of quiet geomagnetic field changes upon values used for main field modeling Some effects of quiet geomagnetic field changes upon values used for main field modeling
The effects of three methods of data selection upon the assumed main field levels for geomagnetic observatory records used in main field modeling were investigated for a year of very low solar-terrestrial activity. The first method concerned the differences between the year's average of quiet day field values and the average of all values during the year. For H these differences were 2-3...
Authors
W.H. Campbell
Assessment of models proposed for the 1985 revision of the international geomagnetic reference field Assessment of models proposed for the 1985 revision of the international geomagnetic reference field
Geomagnetic measurements from land, marine and aerial surveys conducted in the years 1945-1964 were used to test the 14 models proposed as additions, for that period, to the series of definitive geomagnetic reference field (DGRF) models. Overall, NASA's 'SFAS' models and the BGS (British Geological Survey) models agree best with these data. Comparisons of the two proposed definitive main...
Authors
N.W. Peddie, A.K. Zunde