Publications
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Seismic refraction studies of the Imperial Valley region, California— Profile models, a traveltime contour map, and a gravity model
No abstract available.
Authors
Gary S. Fuis, W. D. Mooney, J. H. Healy, G. A. McMechan, W. J. Lutter
The geologic investigation of the Taurus-Littrow Valley; Apollo 17 landing site, with a section on Apollo 17 lunar surface photography
No abstract available.
Authors
Edward W. Wolfe, N. G. Bailey, Baerbel K. Lucchitta, W.R. Muehlberger, D. H. Scott, R. L. Sutton, H. G. Wilshire, R. M. Batson, K.B. Larson, R.L. Tyner
A model for creeping flow in landslides
No abstract available.
Authors
William Z. Savage, A.F. Chleborad
Landslides and related features, Tennessee - Chattanooga 1° x 2° sheet
No abstract available.
Authors
Roger E. Thomas
Landslides and related features, Pennsylvania: Warren 1° x 2° sheet
No abstract available.
Authors
John S. Pomeroy
Morphology and processes associated with the accumulation of the fine-grained sediment deposit on the southern New England shelf
A 13,000 km2 area of the southern New England Continental Shelf which is covered by anomalously fine-grained sediment has been surveyed by means of high-resolution, seismic-reflection and side-scan sonar techniques to map its morphology and structure, and a near-bottom instrument system contributed to understanding present activity of the deposit. Seismic-reflection profiles show that the fine-gra
Authors
David C. Twichell, Charles E. McClennen, Bradford Butman
Mars and Earth: Comparison of cold-climate features
On Earth, glacial and periglacial features are common in areas of cold climate. On Mars, the temperature of the present-day surface is appropriate for permafrost, and the presence of water is suspected from data relating to the outgassing of the planet, from remote-sensing measurements over the polar caps and elsewhere on the Martian surface, and from recognition of fluvial morphological features
Authors
Baerbel K. Lucchitta
210Pb method for estimating the rate of carbonate sand sedimentation
The plot of 210Pb activity against depth in carbonate sands on the Virgin Island Bank is a negative asymmetric hyperbolic curve. As depth increases, an initial rapid decrease in 210Pb activity caused by the decay of unsupported 210Pb and 226Ra is followed by increasing activity as a result of 210Pb achieving equilibrium with in growing 230Th. As this curve is time dependent, an estimate of the rel
Authors
Charles W. Holmes
East Pacific rise at 21°N: the volcanic, tectonic, and hydrothermal processes of the central axis
Photographs obtained by the ANGUS survey system at 21°N reveal many similarities to the geological processes delineated at other spreading centers and in particular those observed in the Galapagos Rift at 86°W. The region of recent volcanism is restricted to a narrow zone (Zone 1) approximately 1 km wide. This suggests that the width of the magma chamber feeding these flows is also narrow at the t
Authors
Richard D. Ballard, Jean Francheteau, Tierre Juteau, Claude Rangan, William Normark
Sedimentary framework of the Potomac River estuary, Maryland
Analyses of seismic-reflection profiles, sediment cores, grab samples, and side-scan sonar records, along with previously collected borehole data, reveal the characteristics, distribution, and geologic history of the shallow strata beneath the Potomac River estuary. The lowermost strata are sediments of the Chesapeake Group (lower Miocene to lower Pleistocene) that crop out on land near the shore
Authors
Harley J. Knebel, E. Ann Martin, J.L. Glenn, Sally W. Needell
Annual and semiannual variations of the geomagnetic field at equatorial locations
For a year of quiet solar-activity level, geomagnetic records from American hemisphere observatories located between about 0?? and 30?? north geomagnetic latitude were used to compare the annual and semiannual variations of the geomagnetic field associated with three separate contributions: (a) the quiet-day midnight level, MDT; (b) the solar-quiet daily variation, Sq; (c) the quiet-time lunar sem
Authors
W.H. Campbell
Ridges and scarps in the equatorial belt of Mars
The morphology and distribution of ridges and scarps on Mars in the ± 30° latitude belt were investigated. Two distinct types of ridges were recognized. The first is long and linear, resembling mare ridges on the Moon; it occurs mostly in plains areas. The other is composed of short, anastomosing segments and occurs mostly in ancient cratered terrain and intervening plateaus. Where ridges are erod
Authors
Baerbel K. Lucchitta, J.L. Klockenbrink