Publications
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Sound Waves Newsletter
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Filter Total Items: 1747
Anthropogenic platinum and palladium in the sediments of Boston Harbor Anthropogenic platinum and palladium in the sediments of Boston Harbor
Anthropogenic activity has increased recent sediment concentrations of Pt and Pd in Boston Harbor by approximately 5 times background concentrations. Surface sediments and downcore profiles were investigated to evaluate Pt and Pd accumulation and behavior in urban coastal sediments. There is no clear correlation between temporal changes in Pt and Pd consumption and sediment concentration...
Authors
C.B. Tuit, G.E. Ravizza, Michael H. Bothner
Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: New insights from seismic data Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: New insights from seismic data
The Blake Ridge Diapir is the southernmost of a line of salt diapirs along the Carolina trough. Diapirs cause faulting of the superjacent sediments, creating pathways for migration of fluids and gas to the seafloor. We analyzed reflection seismic data from the Blake Ridge Diapir, which is located in a region with known abundant gas hydrate occurrence. A striking feature in these data is...
Authors
M.H. Taylor, William P. Dillon, I.A. Pecher
Large-scale shoreline response to storms and fair weather Large-scale shoreline response to storms and fair weather
No abstract available.
Authors
Jeffrey H. List, Amy S. Farris
Tracing sediment dispersal on nourished beaches: Two case studies Tracing sediment dispersal on nourished beaches: Two case studies
The event- to decade-scale patterns of sediment dispersal on two artificially nourished beaches have been mapped using a combination of geophysical surveys, closely-spaced vibracores, and repeated beach profiles. At both Wrightsville Beach, NC and Folly Island, SC the sediment used for beach nourishment is macroscopically distinct from native sediment and can be used to identify sediment...
Authors
E. Robert Thieler, Paul T. Gayes, William C. Schwab, M. Scott Harris
Seismic expression of the Chesapeake Bay impact crater: Structural and morphologic refinements based on new seismic data Seismic expression of the Chesapeake Bay impact crater: Structural and morphologic refinements based on new seismic data
This work refines previous interpretations of the structure and morphology of the Chesapeake Bay impact crater on the basis of more than 1,200 km of multichannel and single-channel seismic reflection profiles collected in the bay and on the adjacent continental shelf. The outer rim, formed in sedimentary rocks, is irregularly circular, with an average diameter of ~85 km. A 20–25-km-wide...
Authors
C. Wylie Poag, Deborah R. Hutchinson, Steve M. Colman, Myung W. Lee
Modern accumulation rates and a sediment budget for the Eel shelf: a flood-dominated depositional environment Modern accumulation rates and a sediment budget for the Eel shelf: a flood-dominated depositional environment
The northern California continental margin is periodically impacted by geologically significant storms, which have a marked influence on terrigenous sediment supply, flood deposition, and long-term accumulation of fine-grained sediment on the Eel shelf. Accumulation of Eel River muds on the adjacent shelf was investigated using 210Pb and 137Cs geochronologies, in order to understand the...
Authors
Christopher K. Sommerfield, Charles A. Nittrouer
The Columbia River littoral cell: A sediment budget overview The Columbia River littoral cell: A sediment budget overview
No abstract available.
Authors
G. Gelfenbaum, C. R. Sherwood, C. D. Peterson, G. M. Kaminsky, Maarten C. Buijsman, D.C. Twichell, P. Ruggiero, A. E. Gibbs, C. Reed
Time-series photographs of the sea floor in western Massachusetts Bay: June - October, 1996 Time-series photographs of the sea floor in western Massachusetts Bay: June - October, 1996
No abstract available.
Authors
Bradford Butman, John Evans, William Lange, Chris F. Polloni
Great earthquakes, abundant sand, and high wave energy in the Columbia Cell, USA Great earthquakes, abundant sand, and high wave energy in the Columbia Cell, USA
No abstract available.
Authors
Curt D. Peterson, Guy R. Gelfenbaum, Harry M. Jol, Jim B. Phipps, Frank Reckendorf, Dave C. Twichell, Sandy Vanderberg, Lorraine Woxell
Cobalt-rich ferromanganese crusts in the Pacific Cobalt-rich ferromanganese crusts in the Pacific
Co-rich Fe-Mn crusts occur throughout the Pacific on seamounts, ridges, and plateaus where currents have kept the rocks swept clean of sediments at least intermittently for millions of years. Crusts precipitate out of cold ambient sea water onto hard-rock substrates forming pavements up to 250 mm thick. Crusts are important as a potential resource for Co, Ni, Pt, Mn, Tl, Te, and other...
Authors
James R. Hein, Andrea Koschinsky, Michael Bau, Frank T. Manheim, Jung-Keuk Kang, Leanne Roberts
Seismic reflections identify finite differences in gas hydrate resources Seismic reflections identify finite differences in gas hydrate resources
Gas hydrate is a gas-bearing, ice-like crystalline solid. The substance's build ing blocks consist of a gas molecule (generally methane) sur-rounded by a cage of water molecules. The total amount of methane in hydrate in the world is immense - the most recent speculative estimate centers on values of 21x1015 cu meters. Thus, it may represent a future energy resource. This estimate was...
Authors
William P. Dillon, M. Max
Anoxia pre-dates Frasnian–Famennian boundary mass extinction horizon in the Great Basin, USA Anoxia pre-dates Frasnian–Famennian boundary mass extinction horizon in the Great Basin, USA
Major and trace metal results from three Great Basin stratigraphic sections with strong conodont biostratigraphy identify a distinct anoxic interval that precedes, but ends approximately 100 kyr before, the Frasnian–Famennian (F–F, mid-Late Devonian) boundary mass extinction horizon. This horizon corresponds to the final and most severe step of a more protracted extinction period. These...
Authors
John F. Bratton, William B. N. Berry, Jared R. Morrow