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Sound Waves Newsletter
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Filter Total Items: 1741
Merged GLORIA sidescan and hydrosweep pseudo-sidescan: Processing and creation of digital mosaics Merged GLORIA sidescan and hydrosweep pseudo-sidescan: Processing and creation of digital mosaics
We have replaced the usual band of poor-quality data in the near-nadir region of our GLORIA long-range sidescan-sonar imagery with a shaded-relief image constructed from swath bathymetry data (collected simultaneously with GLORIA) which completely cover the nadir area. We have developed a technique to enhance these "pseudo-sidescan" images in order to mimic the neighbouring GLORIA...
Authors
R.T. Bird, R. C. Searle, V. Paskevich, D.C. Twichell
Integration of orthophotographic and sidescan sonar imagery: an example from Lake Garda, Italy Integration of orthophotographic and sidescan sonar imagery: an example from Lake Garda, Italy
Digital orthophotos of Lake Garda basin area are available at the scale of up to 1:10,000 from a 1994 high altitude (average scale of 1:75,000) air photo coverage of Italy collected with an RC30 camera and Panatomic film. In October 1994 the lake bed was surveyed by USGS and CISIG personnel using a SIS 1000 Sea-Floor Mapping System. Subsystems of the SIS-1000 include high resolution...
Authors
Giuseppe Gentili, David C. Twichell, Bill Schwab
Studies of mass-movement processes on submarine slopes Studies of mass-movement processes on submarine slopes
No abstract available.
Authors
Lincoln F. Pratson, Homa J. Lee, Gary Parker, Marcelo H. Garcia, B. Coakley, David Mohrig, Jacques Locat, Ulisses Mello, Jeffrey D. Parsons, Sun-Uk Choi, Kenneth Isreal
Continental-margin seismic stratigraphy: Assessing the preservation potential of heterogeneous geological processes operating on continental shelves and slopes Continental-margin seismic stratigraphy: Assessing the preservation potential of heterogeneous geological processes operating on continental shelves and slopes
No abstract available.
Authors
James A. Austin, Craig S. Fulthorpe, Gregory S. Mountain, Daniel L. Orange, Michael E. Field
Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys
Aeromagnetic surveys, spaced ≤5 km, over widely separated areas of the largely ice- and sea-covered West Antarctic rift system, reveal similar patterns of 100- to 1700-nT, shallow-source magnetic anomalies interpreted as evidence of extensive late Cenozoic volcanism. We use the aeromagnetic data to extend the volcanic rift interpretation over West Antarctica starting with anomalies over...
Authors
John C. Behrendt, R. Saltus, D. Damaske, A. McCafferty, C. A. Finn, D. Blankenship, R.E. Bell
Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays
High concentrations of osmium (Os) and silver (Ag) and low 187Os/186Os ratios in Boston sewage make these elements sensitive tracers of the influence of sewage on marine sediments in Massachusetts and Cape Cod bays. Pristine marine sediments have Ag concentrations more than 200 times lower than sewage sludge, Os concentrations 10-40 times lower, and 187Os/186Os ratios six times higher...
Authors
G.E. Ravizza, Michael H. Bothner
Silt heavy-mineral distributions off the Southeastern United States Silt heavy-mineral distributions off the Southeastern United States
Until recently heavy-mineral studies of marine sediments were largely restricted to sand fractions. New techniques permitting analysis of decalcified silt fractions have been applied to sediments off the southeastern United States. Our data, which confirm predictions from the basic relationship among grain size, specific gravity, and equivalent hydraulic transport behavior, show that
Authors
L.J. Poppe, J.A. Commeau
A review of the tectonic problems of the strike-slip northern boundary of the Caribbean Plate and examination by GLORIA A review of the tectonic problems of the strike-slip northern boundary of the Caribbean Plate and examination by GLORIA
No abstract available.
Authors
William P. Dillon, N. Terence Edgar, Kathryn M. Scanlon, Dwight F. Coleman
High-resolution seismic-reflection surveys of Lake Baikal, Siberia, 1990-1992 High-resolution seismic-reflection surveys of Lake Baikal, Siberia, 1990-1992
No abstract available.
Authors
Steven M. Colman, D.S. Foster, Josephine Hatton
Analysis of the mobility of far reaching debris flows on the Mississippi Fan, Gulf of Mexico Analysis of the mobility of far reaching debris flows on the Mississippi Fan, Gulf of Mexico
No abstract available.
Authors
J. Locat, H. J. Lee, H.C. Nelson, W. C. Schwab, D.C. Twichell
Impact origin of the Chesapeake Bay structure and the source of the North American tektites Impact origin of the Chesapeake Bay structure and the source of the North American tektites
Seismic profiles, drill core samples, and gravity data suggest that a complex impact crater ~35.5 million years old and 90 kilometers in diameter is buried beneath the lower Chesapeake Bay. The breccia that fills the structure contains evidence of shock metamorphism, including impact melt breccias and multiple sets of planar deformation features (shock lamellae) in quartz and feldspar...
Authors
C. Koeberl, C. W. Poag, W.U. Reimold, D. Brandt