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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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  • Huybers, Peter; Wunsch, Carl (2005-01-24)
    The timing of glacial/interglacial cycles at intervals of about 100,000 yr (100 kyr) is commonly attributed to control by Earth orbital configuration variations. This “pacemaker” hypothesis has inspired many models, variously ...
  • McPeak, Sean P.; D'Spain, Gerald L.; Stephen, Ralph A. (Woods Hole Oceanographic Institution, 2011-05)
    On the Ocean Bottom Seismometer Augmentation to the Philippine Sea Experiment (OBSAPS, April-May, 2011, R/V Revelle), a VLA and six OBSs were deployed to listen to an active acoustic source, a J15-3. This report describes ...
  • Ito, Garrett T.; Lin, Jian; Graham, David W. (American Geophysical Union, 2003-11-20)
    Hot spot–mid-ocean ridge interactions cause many of the largest structural and chemical anomalies in Earth's ocean basins. Correlated geophysical and geochemical anomalies are widely explained by mantle plumes that deliver ...
  • Lundstrom, Craig C.; Chaussidon, Marc; Hsui, Albert T.; Kelemen, Peter B.; Zimmerman, Mark (2004-08-10)
    The Trinity peridotite (northern CA) contains numerous lithologic sequences consisting of dunite to harzburgite to spinel lherzolite to plagioclase lherzolite. Previous workers have documented geochemical gradients in these ...
  • Hanna, Edward; McConnell, Joseph R.; Das, Sarah B.; Cappelen, John; Stephens, Ag (American Meteorological Society, 2006-02-01)
    Annual and monthly snow accumulation for the Greenland Ice Sheet was derived from ECMWF forecasts [mainly 40-yr ECMWR Re-Analysis (ERA-40)] and further meteorological modeling. Modeled accumulation was validated using 58 ...
  • Karnauskas, Kristopher B.; Murtugudde, Raghu; Busalacchi, Antonio J. (American Meteorological Society, 2010-12)
    Although sustained observations yield a description of the mean equatorial current system from the western Pacific to the eastern terminus of the Tropical Atmosphere Ocean (TAO) array, a comprehensive observational dataset ...
  • Dougherty, Martin E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-08)
    Seismic studies of the oceanic crust, both experimental and theoretical, often assume a flat seafloor and laterally homogeneous crust. This is done regardless of the appearance in seismic data of obvious effects due to ...
  • Stephen, Ralph A.; Kemp, John N.; McPeak, Sean P.; Bolmer, S. Thompson; Carey, Scott; Aaron, Ernie; Campbell, Richard L.; Moskovitz, Brianne; Calderwood, John; Cohen, Ben; Worcester, Peter F.; Dzieciuch, Matthew A. (Woods Hole Oceanographic Institution, 2011-09)
    The Ocean Bottom Seismometer Augmentation to the Philippine Sea Experiment (OBSAPS, April-May, 2011, R/V Revelle) addresses the coherence and depth dependence of deep-water ambient noise and signals. During the 2004 NPAL ...
  • de Abreu, Lucia; Abrantes, Fatima G.; Shackleton, Nicholas J.; Tzedakis, Polychronis C.; McManus, Jerry F.; Oppo, Delia W.; Hall, Michael A. (American Geophysical Union, 2005-08-30)
    Similar orbital geometry and greenhouse gas concentrations during marine isotope stage 11 (MIS 11) and the Holocene make stage 11 perhaps the best geological analogue period for the natural development of the present ...
  • Thresher, Ronald E.; Rintoul, Stephen R.; Koslow, J. Anthony; Weidman, Christopher R.; Adkins, Jess F.; Proctor, Craig (American Geophysical Union, 2004-04-13)
    Chemical analysis of deepwater octocorals collected at 1000 m depth off southern Australia indicates long-term cooling, beginning in the mid-18th century. This cooling appears to reflect shoaling of isotherms along the ...
  • Williams, Clare M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-09)
    The origin of symmetric alternating magnetic polarity stripes on the seafloor is investigated in two marine environments; along the ridge axis of the fast spreading East Pacific Rise (EPR) (9º 25’-9º 55’N) and at Kane ...
  • Stephen, Ralph A.; Spiess, Fred N.; Collins, John A.; Hildebrand, John A.; Orcutt, John A.; Peal, Kenneth R.; Vernon, F. L.; Wooding, Frank B. (2003-10-31)
    The primary goal of the Ocean Seismic Network Pilot Experiment (OSNPE) was to learn how to make high quality broadband seismic measurements on the ocean bottom in preparation for a permanent ocean seismic network. The ...
  • Boettcher, Margaret S.; Hirth, Greg; Evans, Brian (American Geophysical Union, 2007-01-31)
    We investigate the strength and frictional behavior of olivine aggregates at temperatures and effective confining pressures similar to those at the base of the seismogenic zone on a typical ridge transform fault. Triaxial ...
  • Tucholke, Brian E.; Macdonald, Ken C.; Fox, Paul J. (American Geophysical Union, 1991-06-18)
    Long-term Natural Laboratories for in-depth studies of the seafloor at both a slowspreading (<30 mm/yr) and a fast-spreading (>60 mm/yr) mid-ocean ridge are being established by the Office of Naval Research. The two Natural ...
  • Marchal, Olivier; Curry, William B. (American Meteorological Society, 2008-09)
    An inverse method is used to evaluate the information contained in sediment data for the Atlantic basin during the Last Glacial Maximum (defined here as the time interval 18–21 kyr before present). The data being considered ...
  • von Reden, Karl F.; Roberts, Mark L.; Burton, Joshua R.; Beaupre, Steven R. (2011-09)
    A 2.45 GHz microwave ion source coupled with a magnesium charge exchange canal (CxC) has been successfully adapted to a large acceptance radiocarbon accelerator mass spectrometry system at the National Ocean Sciences AMS ...
  • Stephen, Ralph A. (Acoustical Society of America, 2000-03)
    Gaussian beams provide a useful insonifying field for surface or interface scattering problems such as encountered in electromagnetics, acoustics and seismology. Gaussian beams have these advantages: (i) They give a finite ...
  • Laarkamp, Kirsten L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-09)
    Phosphorus, an essential nutrient, is removed from the oceans only through burial with marine sediments. Organic phosphorus (Porg) constitutes an important fraction (ca. 25%) of total-P in marine sediments. However, given ...
  • Draut, Amy E.; Clift, Peter D. (Geological Society of London, 2002)
    Dalradian meta-sediments of the Laurentian margin and mafic intrusions thereof in SW Connemara, Ireland, tectonically overlie meta-rhyolites of the Delaney Dome Formation. The two units are separated by the Mannin Thrust. ...
  • Louden, Keith E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-09)
    This thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin ...

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