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Browsing Geology and Geophysics (G&G) by Title

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Browsing Geology and Geophysics (G&G) by Title

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  • Sohn, Robert A.; Webb, Spahr C.; Hildebrand, John A. (American Geophysical Union, 2004-12-09)
    We use a combination of body wave and interface wave observations from an on-bottom seismic refraction survey to constrain the fine-scale seismic structure of the upper crust in a ∼3 × 3 km field area centered on the East ...
  • Stephen, Ralph A.; Swift, Stephen A. (Acoustical Society of America, 1994-01)
    A major problem in understanding seismic wave propagation in the seafloor is to distinguish between the loss of energy due to intrinsic attenuation and the loss of energy due to scattering from fine scale heterogeneities ...
  • Patrut, Adrian; Mayne, Diana H.; von Reden, Karl F.; Lowy, Daniel A.; van Pelt, Robert; McNichol, Ann P.; Roberts, Mark L.; Margineanu, Dragos (Dept. of Geosciences, University of Arizona, 2010-08)
    The article reports the first radiocarbon dating of a live African baobab (Adansonia digitata L.), by investigating wood samples collected from 2 inner cavities of the very large 2-stemmed Platland tree of South Africa. ...
  • Lund, David C.; Curry, William B. (American Geophysical Union, 2006-05-05)
    The salinity and temperature of the Florida Current are key parameters affecting the transport of heat into the North Atlantic, yet little is known about their variability on centennial time scales. Here we report replicated, ...
  • Lynch-Stieglitz, Jean; Curry, William B.; Lund, David C. (American Geophysical Union, 2009-09-01)
    The density structure across the Florida Straits is reconstructed for the last 8000 years from oxygen isotope measurements on foraminifera in sediment cores. The oxygen isotope measurements suggest that the density contrast ...
  • Young, Robert Alexander (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1975-09)
    Erosion processes involving fine-grained marine sediments were studied by using an in situ flume to erode undisturbed bottom sediments on the sea floor in Buzzards Bay, a shallow marine embayment off the Massachusetts coast. ...
  • Paola, Christopher (Woods Hole Oceanographic Institution, 1983-06)
    The first of two sets of data reported here, measured over two-dimensional immobile current ripples, comprises skin-friction time series at four streamwise positions and velocity profiles measured to within a few mm of ...
  • Little, Sarah A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-04-08)
    Several experiments are presented in this thesis which examine methods to measure and monitor fluid flow from hydrothermal vent fields. Simultaneous velocity, temperature, and conductivity data were collected in the ...
  • Gardner, Wilford D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1977-10)
    Sediment traps designed to yield quantitative data of particulate fluxes have been deployed and successfully recovered on four moorings in the deep sea. The traps were designed after extensive calibration of different ...
  • Dziak, Robert P.; Baker, Edward T.; Shaw, Alison M.; Bohnenstiehl, DelWayne R.; Chadwick, William W.; Haxel, J. H.; Matsumoto, Haru; Walker, Sharon L. (American Geophysical Union, 2012-11-29)
    The output of gas and tephra from volcanoes is an inherently disorganized process that makes reliable flux estimates challenging to obtain. Continuous monitoring of gas flux has been achieved in only a few instances at ...
  • Garry, W. Brent; Gregg, Tracy K. P.; Soule, Samuel A.; Fornari, Daniel J. (American Geophysical Union, 2006-03-28)
    Laboratory simulations using polyethylene glycol (PEG) extruded at a constant rate and temperature into a tank with a uniform basal slope and filled with a cold sucrose solution generate channels that are defined by ...
  • Watkins, William A.; Schevill, William E. (Woods Hole Oceanographic Institution, 1971-10)
    This report describes a non-rigid, floating, four-hydrophone array that can give accurate three-dimensional locations for certain underwater sound sources, particularly for those that are close. For more distant sounds, ...
  • Stracke, Andreas; Hofmann, Albrecht W.; Hart, Stanley R. (American Geophysical Union, 2005-05-19)
    The parameter μ describes the 238U/204Pb ratio of an Earth reservoir. Mantle domains labeled HIMU (high μ) originally defined reservoirs with highly radiogenic Pb isotope ratios observed in basalts from a select number of ...
  • Das, Sarah B.; Joughin, Ian; Behn, Mark D.; Howat, Ian M.; King, Matt A.; Lizarralde, Daniel; Bhatia, Maya P. (2008-02-20)
    Surface meltwater that reaches the base of an ice sheet creates a mechanism for the rapid response of ice flow to climate change. The process whereby such a pathway is created through thick, cold ice has not, however, ...
  • Liu, Yajing; McGuire, Jeffrey J.; Behn, Mark D. (American Geophysical Union, 2012-04-26)
    We use a three-dimensional strike-slip fault model in the framework of rate and state-dependent friction to investigate earthquake behavior and scaling relations on oceanic transform faults (OTFs). Gabbro friction data ...
  • Nedimovic, Mladen R.; Carbotte, Suzanne M.; Harding, Alistair J.; Detrick, Robert S.; Canales, J. Pablo; Diebold, John B.; Kent, Graham M.; Tischer, Michael; Babcock, Jeffrey M. (2005-06-15)
    The Earth's oceanic crust crystallizes from magmatic systems generated at mid-ocean ridges. Whereas a single magma body residing within the mid-crust is thought to be responsible for the generation of the upper oceanic ...
  • von Reden, Karl F. (2009-04-13)
    The NOSAMS 3 MV Tandetron AMS system will soon reach its 20th anniversary of operation. A critical review of all aspects of the system is necessary to assess the analytical, economic, and operational factors that enter ...
  • Roberts, Mark L.; von Reden, Karl F.; Burton, Joshua R.; McIntyre, Cameron P.; Beaupre, Steven R. (2011-10-31)
    The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility at the Woods Hole Oceanographic Institution has developed an Accelerator Mass Spectrometry (AMS) system designed specifically for the analysis of ...
  • Orsi, William D.; Edgcomb, Virginia P.; Christman, Glenn D.; Biddle, Jennifer F. (2013-04-23)
    Scientific ocean drilling has revealed a deep biosphere of widespread microbial life in sub-seafloor sediment. Microbial metabolism in the marine subsurface likely plays an important role in global biogeochemical cycles1-3 ...
  • Sohn, Robert A. (American Geophysical Union, 2005-11-15)
    Binary mixing is one of the most common models used to explain variations in geochemical data. When the data being modeled are ratios of elements or isotopes, the mixtures follow hyperbolic trends with curvatures that ...

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