Publications
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Filter Total Items: 1739
Post-Mazama (7 KA) faulting beneath Upper Klamath Lake, Oregon Post-Mazama (7 KA) faulting beneath Upper Klamath Lake, Oregon
High-resolution seismic-reflection profiles (3.5 kHz) show that a distinctive, widespread reflection occurs in the sediments beneath Upper Klamath Lake, Oregon. Coring reveals that this reflection is formed by Mazama tephra (MT), about 7 ka in age. The MT horizon is faulted in many places and locally displaced by as much as 3.1 m. Differential displacement of multiple horizons indicates...
Authors
Steven M. Colman, J. G. Rosenbaum, R. L. Reynolds, A.M. Sarna-Wojcicki
Time-averaged fluxes of lead and fallout radionuclides to sediments in Florida Bay Time-averaged fluxes of lead and fallout radionuclides to sediments in Florida Bay
Recent, unmixed sediments from mud banks of central Florida Bay were dated using 210Pb/226Ra, and chronologies were verified by comparing sediment lead temporal records with Pb/Ca ratios in annual layers of coral (Montastrea annularis) located on the ocean side of the Florida Keys. Dates of sediment lead peaks (1978±2) accord with prior observations of a 6 year lag between the occurrence...
Authors
J. A. Robbins, C. Holmes, R. Halley, Michael H. Bothner, E. Shinn, J. Graney, G. Keeler, M. TenBrink, K.A. Orlandini, D. Rudnick
Acoustic Doppler Current Profiler Data Processing System manual [ADCP] Acoustic Doppler Current Profiler Data Processing System manual [ADCP]
This open-file report describes the data processing software currently in use by the U.S. Geological Survey (USGS), Woods Hole Coastal and Marine Science Center (WHCMSC), to process time series of acoustic Doppler current data obtained by Teledyne RD Instruments Workhorse model ADCPs. The Sediment Transport Instrumentation Group (STG) at the WHCMSC has a long-standing commitment to...
Authors
Jessica M. Cote, Frances S. Hotchkiss, Marinna A. Martini, Charles R. Denham, Andree L. revisions by Ramsey, Stephen Ruane
National assessment of coastal vulnerability to sea-level rise: Preliminary results for the U.S. Gulf of Mexico Coast National assessment of coastal vulnerability to sea-level rise: Preliminary results for the U.S. Gulf of Mexico Coast
No abstract available.
Authors
E. Robert Thieler, Erika S. Hammar-Klose
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
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
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
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