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Sound Waves Newsletter
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Filter Total Items: 1747
Sea floor topographic, backscatter, and interpretive maps and bottom photos of the Massachusetts Bay Disposal Site region off Boston, Massachusetts Sea floor topographic, backscatter, and interpretive maps and bottom photos of the Massachusetts Bay Disposal Site region off Boston, Massachusetts
No abstract available.
Authors
Page C. Valentine, Jessica L. Baker, Tanya S. Unger, John Evans, Christopher F. Polloni
Contaminated-sediment database development and assessment in Boston Harbor Contaminated-sediment database development and assessment in Boston Harbor
Bottom sediments have been regarded as memory banks for contaminant inputs to urban waterways. Bottom sediments accumulate by the addition of particles that enter the waterway from many sources (U.S. National Research Council, 1989). Sediments include solid contaminants, as well as contaminants from the water column that are adsorbed on organic matter or soil (rock) particles. Sediments...
Authors
Water Resources Division U.S. Geological Survey
Clathrate eustasy: Methane hydrate melting as a mechanism for geologically rapid sea-level fall Clathrate eustasy: Methane hydrate melting as a mechanism for geologically rapid sea-level fall
Although submarine methane hydrates or clathrates have been highlighted as potential amplifiers of modern global climate change and associated glacio-eustatic sea-level rise, their potential role in sea-level fall has not been appreciated. Recent estimates of the total volume occupied by gas hydrates in marine sediments vary 20-fold, from 1.2 × 1014 to 2.4 × 1015 m3. Using a specific...
Authors
J.F. Bratton
Plate deformation at depth under northern California: Slab gap or stretched slab? Plate deformation at depth under northern California: Slab gap or stretched slab?
Plate kinematic interpretations for northern California predict a gap in the underlying subducted slab caused by the northward migration of the Pacific-North America-Juan de Fuca triple junction. However, large-scale decompression melting and asthenospheric upwelling to the base of the overlying plate within the postulated gap are not supported by geophysical and geochemical observations...
Authors
Uri S. ten Brink, N. Shimizu, P.C. Molzer
Anatomy of the Dead Sea transform: Does it reflect continuous changes in plate motion? Anatomy of the Dead Sea transform: Does it reflect continuous changes in plate motion?
A new gravity map of the southern half of the Dead Sea transform offers the first regional view of the anatomy of this plate boundary. Interpreted together with auxiliary seismic and well data, the map reveals a string of subsurface basins of widely varying size, shape, and depth along the plate boundary and relatively short (25–55 km) and discontinuous fault segments. We argue that this...
Authors
Uri S. ten Brink, M. Rybakov, A. S. Al-Zoubi, M. Hassouneh, U. Frieslander, A.T. Batayneh, V. Goldschmidt, M.N. Daoud, Y. Rotstein, J.K. Hall
Digital sidescan-sonar imagery of the Manchas Interiores-Manchas Exteriores coral reef complex, Mayagüez, Puerto Rico Digital sidescan-sonar imagery of the Manchas Interiores-Manchas Exteriores coral reef complex, Mayagüez, Puerto Rico
No abstract available.
Authors
VeeAnn Cross, William C. Schwab
Deep seismic reflections beneath the Trans-Antarctic Mountain Front, from reprocessed SERIS seismic data Deep seismic reflections beneath the Trans-Antarctic Mountain Front, from reprocessed SERIS seismic data
No abstract available.
Authors
S. Bannister, A. Melhuish, S. Henrys, T. Stern, Uri S. ten Brink
Calculation and error analysis of a digital elevation model of Hofsjokull, Iceland, from SAR interferometry Calculation and error analysis of a digital elevation model of Hofsjokull, Iceland, from SAR interferometry
Two ascending European Space Agency (ESA) Earth Resources Satellites (ERS)-1/-2 tandem-mode, synthetic aperture radar (SAR) pairs are used to calculate the surface elevation of Hofsjokull, an ice cap in central Iceland. The motion component of the interferometric phase is calculated using the 30 arc-second resolution USGS GTOPO30 global digital elevation product and one of the ERS tandem...
Authors
Jonathan S. Barton, Dorothy K. Hall, Oddur Sigurdsson, Richard S. Williams, Laurence C. Smith, James B. Garvin
Biogenic silica from the BDP93 drill site and adjacent areas of the Selenga Delta, Lake Baikal, Siberia Biogenic silica from the BDP93 drill site and adjacent areas of the Selenga Delta, Lake Baikal, Siberia
Biogenic silica contents of sediments on the lower Selenga Delta and Buguldeika saddle in Lake Baikal show distinct fluctuations that reflect changes in diatom productivity, and ultimately, climate. The pattern of the upper 50 m of the section, dating from about 334 ka, is similar to that of the marine oxygen-isotope record, increasingly so as the younger sediments become progressively...
Authors
Steven M. Colman, John A. Peck, Josephine Hatton, Eugene B. Karabanov, John W. King
Formation of natural gas hydrates in marine sediments 1. Conceptual model of gas hydrate growth conditioned by host sediment properties Formation of natural gas hydrates in marine sediments 1. Conceptual model of gas hydrate growth conditioned by host sediment properties
The stability of submarine gas hydrates is largely dictated by pressure and temperature, gas composition, and pore water salinity. However, the physical properties and surface chemistry of deep marine sediments may also affect the thermodynamic state, growth kinetics, spatial distributions, and growth forms of clathrates. Our conceptual model presumes that gas hydrate behaves in a way...
Authors
M. B. Clennell, M. Hovland, J.S. Booth, P. Henry, W.J. Winters
Geologic mapping of the nearshore area offshore of Fire Island, New York Geologic mapping of the nearshore area offshore of Fire Island, New York
No abstract available.
Authors
W. C. Schwab, E.R. Thieler, J.R. Allen, D.S. Foster, B.A. Smith, J. F. Denny, W. W. Danforth
Space and time scales of shoreline change at Cape Cod National Seashore, MA, USA Space and time scales of shoreline change at Cape Cod National Seashore, MA, USA
Different processes cause patterns of shoreline change which are exhibited at different magnitudes and nested into different spatial and time scale hierarchies. The 77-km outer beach at Cape Cod National Seashore offers one of the few U.S. federally owned portions of beach to study shoreline change within the full range of sediment source and sink relationships, and barely affected by...
Authors
J.R. Allen, C.L. LaBash, J. H. List