Publications
Filter Total Items: 7487
Ice sculpture in the Martian outflow channels Ice sculpture in the Martian outflow channels
Many landforms in Martian outflow channels have characteristics that suggest sculpture by glaciers, ice streams, or ice sheets. Viking Orbiter and terrestrial satellite images were examined at similar resolution to compare features of the Martian outflow channels to features produced by the movement of ice on earth. Many resemblances were found. They include the anastomoses, sinuosities...
Authors
Baerbel K. Lucchitta
Reflection—refraction of general P- and type-I S-waves in elastic and anelastic solids Reflection—refraction of general P- and type-I S-waves in elastic and anelastic solids
The reflection and refraction of general (homogeneous or inhomogeneous) plane P and type-I S(SV) body waves incident on plane boundaries are considered for general linear viscoelastic solids. Reflection—refraction laws, physical characteristics of the waves, and the nature of critical angles are examined in detail at welded boundaries and a free surface. General visco-elasticity with no...
Authors
Roger D. Borcherdt
On the status of in-situ strong ground motion and structural response investigations On the status of in-situ strong ground motion and structural response investigations
No abstract available.
Authors
C. Rojahn, Roger D. Borcherdt
Seismic zonation of the Los Angeles region: A progress report Seismic zonation of the Los Angeles region: A progress report
No abstract available.
Authors
S. T. Algermissen, B. L. Askew, Roger D. Borcherdt, R. H. Campbell, S. H. Clarke, Jack F. Evernden, T. E. Fumal, J. F. Gibbs, H. G. Greene, Thomas C. Hanks, E. L. Harp, S.H. Hartzell, M. G. Hooper, C.E. Johnson, W. B. Joyner, D. K. Keefer, W. J. Kockelman, D. S. McCulloch, D. M. Perkins, A. M. Rogers, P. A. Spudich, P.C. Thenhaus, J. C. Tinsley, R. C. Wilson, R.F. Yerkes, T. L. Youd, J. I. Ziony
Application of wave field continuation to the inversion of refraction data Application of wave field continuation to the inversion of refraction data
Three examples of the inversion of refraction data by downward continuation illustrate the applicability of the method to field data. The first example is a refraction profile from the Mojave Desert, California. These data are spatially aliased and contain clear evidence of lateral inhomogeneity. The inversion in this case produces a broken image in the slowness‐depth domain due to the...
Authors
G. A. McMechan, Robert W. Clayton, Walter D. Mooney
Leg 84 of the Deep Sea Drilling Project Leg 84 of the Deep Sea Drilling Project
No abstract available.
Authors
J. Aubouin, Roland E. von Huene, M. Baltuck, Robert Arnott, J. Bourgois, M.V. Filewicz, Keith A. Kvenvolden, Barry Leinert, Tom McDonald, Kristin McDougall-Reid, Y. Ogawa, Elliot Taylor, Barbara Winsborough
Implementation of digital subtraction angiography with a synchrotron x-ray beam Implementation of digital subtraction angiography with a synchrotron x-ray beam
The intense synchrotron radiation produced by wiggler magnets at electron storage rings provides a new source of x-rays highly suited to iodine K-edge digital subtraction angiography. The monochromaticity and tunability provide maximum sensitivity to intraarterial iodine and virtually eliminate contrast due to soft tissue and bone. Visualization of arteries, in particular the coronary...
Authors
H.D. Zeman, E.B. Hughes, L.E. Campbell, R. Hofstadter, Randolph L. Kirk, T.J. Krolicki, J. Rolfe, J.P. Stone, S. Wilson, E. Rubenstein, A.C. Thompson, J.T. Walton
Ancient plate boundaries in the Bering Sea region Ancient plate boundaries in the Bering Sea region
Plate tectonic models of the Bering Sea suggest that the abyssal Bering Sea Basin is underlain by oceanic crust, a supposition supported by refraction and magnetic data. The oceanic crust is thought to be a remnant of the Kula(?) plate that was isolated within what is now the Bering Sea when the proto-Aleutian arc began to form between the Alaska Peninsula and Kamchatka in late Mesozoic...
Authors
M. S. Marlow, Alan K. Cooper, David W. Scholl, H. McLean
Spurs and grooves revisited: construction versus erosion, Looe Key Reef, Florida Spurs and grooves revisited: construction versus erosion, Looe Key Reef, Florida
Six of 12 core holes drilled at Looe Key Reef (24°37'18"N. 81°24'24"W) by a diver-operated coring device penetrated a spur and groove system. Drilling indicated that: (II the spurs and grooves formed over at least 5 m of carbonate reef sand: (2) the underlying Pleistocene surface is essentially flat and therefore could not control or initiate spacing of spurs or grooves; (3) only the...
Authors
E.A. Shinn, J.H. Hudson, Daniel M. Robbin, Barbara H. Lidz
The geology of Europa The geology of Europa
The map units and lineations of Europa are detailed, and the geologic processes, and history, and thick and thin ice models of the satellite are discussed. It is concluded that Europa lacks evidence of a horizontally stratified crust; the geology appears characterized by disruption of the crust and intrusions into an icy shell. The surface consists of plains and mottled terrain, the...
Authors
Baerbel K. Lucchitta, Laurence A. Soderblom
Geomagnetic local and regional harmonic analyses Geomagnetic local and regional harmonic analyses
Procedures are developed for using rectangular and cylindrical harmonic analyses in local and regional areas. Both the linear least squares analysis, applicable when component data are available, and the nonlinear least squares analysis, applicable when only total field data are available, are treated. When component data are available, it is advantageous to work with residual fields...
Authors
L.R. Alldredge
International Geomagnetic Reference Field 1980: charts and grid values, IAGA Bulletin No. 47 International Geomagnetic Reference Field 1980: charts and grid values, IAGA Bulletin No. 47
No abstract available.
Authors
Eugene B. Fabiano, N.W. Peddie, D.R. Barraclough, A.K. Zunde