Now showing items 13-32 of 67

    • Elevated gas hydrate saturation within silt and silty clay sediments in the Shenhu area, South China Sea 

      Wang, Xiujuan; Hutchinson, Deborah R.; Wu, Shiguo; Yang, Shengxiong; Guo, Yiqun (American Geophysical Union, 2011-05-25)
      Gas hydrate saturations were estimated using five different methods in silt and silty clay foraminiferous sediments from drill hole SH2 in the South China Sea. Gas hydrate saturations derived from observed pore water ...
    • Ephemerality of discrete methane vents in lake sediments 

      Scandella, Benjamin; Pillsbury, Liam; Weber, Thomas; Ruppel, Carolyn D.; Hemond, Harold; Juanes, Ruben (John Wiley & Sons, 2016-05-04)
      Methane is a potent greenhouse gas whose emission from sediments in inland waters and shallow oceans may both contribute to global warming and be exacerbated by it. The fraction of methane emitted by sediments that bypasses ...
    • Estimating pore-space gas hydrate saturations from well log acoustic data 

      Lee, Myung W.; Waite, William F. (American Geophysical Union, 2008-07-09)
      Relating pore-space gas hydrate saturation to sonic velocity data is important for remotely estimating gas hydrate concentration in sediment. In the present study, sonic velocities of gas hydrate–bearing sands are modeled ...
    • Exploration of the canyon-incised continental margin of the northeastern United States reveals dynamic habitats and diverse communities 

      Quattrini, Andrea M.; Nizinski, Martha S.; Chaytor, Jason D.; Demopoulos, Amanda W. J.; Roark, E. Brendan; France, Scott C.; Moore, Jon A.; Heyl, Taylor; Auster, Peter J.; Kinlan, Brian; Ruppel, Carolyn D.; Elliott, Kelley P.; Kennedy, Brian R. C.; Lobecker, Elizabeth; Skarke, Adam; Shank, Timothy M. (Public Library of Science, 2015-10-28)
      The continental margin off the northeastern United States (NEUS) contains numerous, topographically complex features that increase habitat heterogeneity across the region. However, the majority of these rugged features ...
    • Extension in Mona Passage, Northeast Caribbean 

      Chaytor, Jason D.; ten Brink, Uri S. (Elsevier B.V., 2010-07-15)
      As shown by the recent Mw 7.0 Haiti earthquake, intra-arc deformation, which accompanies the subduction process, can present seismic and tsunami hazards to nearby islands. Spatially-limited diffuse tectonic deformation ...
    • Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California 

      Brothers, Daniel S.; Harding, Alistair J.; Gonzalez-Fernandez, Antonio; Holbrook, W. Steven; Kent, Graham M.; Driscoll, Neal W.; Fletcher, John M.; Lizarralde, Daniel; Umhoefer, Paul J.; Axen, Gary J. (American Geophysical Union, 2012-05-08)
      Subduction of the Farallon plate beneath northwestern Mexico stalled by ~12 Ma when the Pacific-Farallon spreading-ridge approached the subduction zone. Coupling between remnant slab and the overriding North American plate ...
    • A framework for the probabilistic analysis of meteotsunamis 

      Geist, Eric L.; ten Brink, Uri S.; Gove, Matthew (Springer, 2014-06-19)
      A probabilistic technique is developed to assess the hazard from meteotsunamis. Meteotsunamis are unusual sea-level events, generated when the speed of an atmospheric pressure or wind disturbance is comparable to the phase ...
    • Gas and gas hydrate distribution around seafloor seeps in Mississippi Canyon, Northern Gulf of Mexico, using multi-resolution seismic imagery 

      Wood, Warren T.; Hart, Patrick E.; Hutchinson, Deborah R.; Dutta, Nadar; Snyder, Fred; Coffin, Richard B.; Gettrust, Joseph F. (Elsevier B.V., 2008-05-10)
      To determine the impact of seeps and focused flow on the occurrence of shallow gas hydrates, several seafloor mounds in the Atwater Valley lease area of the Gulf of Mexico were surveyed with a wide range of seismic ...
    • Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico 

      Hutchinson, Deborah R.; Hart, Patrick E.; Collett, Timothy S.; Edwards, K. M.; Twichell, David C.; Snyder, Fred (Elsevier B.V., 2008-05-10)
      The Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an intraslope minibasin (Casey basin) in the northern Gulf of Mexico at 1335 m water depth. Around ...
    • Geometry and subsidence history of the Dead Sea basin : a case for fluid-induced mid-crustal shear zone? 

      ten Brink, Uri S.; Flores, Claudia H. (American Geophysical Union, 2012-01-13)
      Pull-apart basins are narrow zones of crustal extension bounded by strike-slip faults that can serve as analogs to the early stages of crustal rifting. We use seismic tomography, 2-D ray tracing, gravity modeling, and ...
    • Geomorphic and stratigraphic evidence for an unusual tsunami or storm a few centuries ago at Anegada, British Virgin Islands 

      Atwater, Brian F.; ten Brink, Uri S.; Buckley, Mark; Halley, Robert S.; Jaffe, Bruce E.; Lopez-Venegas, Alberto M.; Reinhardt, Eduard G.; Tuttle, Maritia P.; Watt, Steve; Wei, Yong (Springer, 2010-10-26)
      Waters from the Atlantic Ocean washed southward across parts of Anegada, east-northeast of Puerto Rico, during a singular event a few centuries ago. The overwash, after crossing a fringing coral reef and 1.5 km of shallow ...
    • Geomorphic characterization of the U.S. Atlantic continental margin 

      Brothers, Daniel S.; ten Brink, Uri S.; Andrews, Brian D.; Chaytor, Jason D. (Elsevier B.V., 2013-01-10)
      The increasing volume of multibeam bathymetry data collected along continental margins is providing new opportunities to study the feedbacks between sedimentary and oceanographic processes and seafloor morphology. Attempts ...
    • Glacial morphology and depositional sequences of the Antarctic continental shelf 

      ten Brink, Uri S.; Schneider, Christopher (Geological Society of America, 1995-07)
      We propose a simple model for the unusual depositional sequences and morphology of the Antarctic continental shelf. Our model considers the regional stratal geometry and the reversed morphology of the Antarctic continental ...
    • Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region 

      ten Brink, Uri S.; Bakun, William H.; Flores, Claudia H. (American Geophysical Union, 2011-12-29)
      We evaluate the long-term seismic activity of the North-American/Caribbean plate boundary from 500 years of historical earthquake damage reports. The 2010 Haiti earthquakes and other earthquakes were used to derive regional ...
    • Hydrate morphology : physical properties of sands with patchy hydrate saturation 

      Dai, Sheng; Santamarina, J. Carlos; Waite, William F.; Kneafsey, Timothy J. (American Geophysical Union, 2012-11-14)
      The physical properties of gas hydrate-bearing sediments depend on the volume fraction and spatial distribution of the hydrate phase. The host sediment grain size and the state of effective stress determine the hydrate ...
    • Magnetic character of a large continental transform : an aeromagnetic survey of the Dead Sea Fault 

      ten Brink, Uri S.; Rybakov, Michael; Al-Zoubi, Abdallah S.; Rotstein, Yair (American Geophysical Union, 2007-07-13)
      New high-resolution airborne magnetic (HRAM) data along a 120-km-long section of the Dead Sea Transform in southern Jordan and Israel shed light on the shallow structure of the fault zone and on the kinematics of the plate ...
    • Mass fractionation of noble gases in synthetic methane hydrate : implications for naturally occurring gas hydrate dissociation 

      Hunt, Andrew G.; Stern, Laura A.; Pohlman, John W.; Ruppel, Carolyn D.; Moscati, Richard J.; Landis, Gary P. (Elsevier B.V., 2012-09-29)
      As a consequence of contemporary or longer term (since 15 ka) climate warming, gas hydrates in some settings may presently be dissociating and releasing methane and other gases to the ocean–atmosphere system. A key challenge ...
    • Mechanical properties of sand, silt, and clay containing tetrahydrofuran hydrate 

      Yun, Tae Sup; Santamarina, J. Carlos; Ruppel, Carolyn D. (American Geophysical Union, 2007-04-17)
      The mechanical behavior of hydrate-bearing sediments subjected to large strains has relevance for the stability of the seafloor and submarine slopes, drilling and coring operations, and the analysis of certain small-strain ...
    • Methane gas hydrate effect on sediment acoustic and strength properties 

      Winters, William J.; Waite, William F.; Mason, D. H.; Gilbert, L. Y.; Pecher, I. A. (2006-04-08)
      To improve our understanding of the interaction of methane gas hydrate with host sediment, we studied: (1) the effects of gas hydrate and ice on acoustic velocity in different sediment types, (2) effect of different ...
    • Methane hydrate formation in partially water-saturated Ottawa sand 

      Waite, William F.; Winters, William J.; Mason, D. H. (Mineralogical Society of America, 2004-08)
      Bulk properties of gas hydrate-bearing sediment strongly depend on whether hydrate forms primarily in the pore fluid, becomes a load-bearing member of the sediment matrix, or cements sediment grains. Our compressional ...