2 edition of subduction experiment found in the catalog.
Richard P. Trask
Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way into the upper thermocline. The subduction process and its underlying mechanisms were studied through a combination of Eulerian and Langrangian measurements of velocity, measurements of tracer distributions and hydrographic properties and modeling. An array of five surface moorings carrying meteorological and oceanographic instrumentation were deployed for a period of two years beginning in June 1991 as part of an Office of Naval Research (ONR) funded Subduction experiment. Three eight month deployments were planned. The initial deployment of five surface moorings took place during the third leg of R/V Oceanus cruise number 240. The moorings were deployed at 18N 34W, 18N 22W, 25.5N 29W, 33N 22W and 33N 34W. A Vector Averaging Wind Recorder (VAWR) and an Improved Meteorological Recorder (IMET) collected wind speed and wind direction, sea surface temperature, air temperature, short wave radiation, long wave radiation, barometric pressure and relative humidity. The IMET also measured precipitation. The moorings were heavily instrumented below the surface with Vector Measuring Current Meters (VMCM) and single point temperature recorders. Expendable bathythermograph (XBT) data were collected and meteorological observations were made while transitting between moonng locations. This report describes the work that took place during R/V Oceanus cruise 240 leg 3. It includes a description of the instrumentation that was deployed,information about the XBT data collected and plots of the data as well as a chronology of the cruise events.
|Other titles||Cruise report R/V Oceanus: cruise number 240 Leg 3., R/V Oceanus: cruise number 240 Leg 3.|
|Statement||by Richard P. Trask, Nancy J. Brink.|
|Series||UOP report -- 93-1., WHOI -- 93-12., WHOI (Series) -- 93-12.|
|Contributions||Brink, Nancy J., Oceanus (Ship)., Woods Hole Oceanographic Institution., Woods Hole Oceanographic Institution. Upper Ocean Processes Group.|
|The Physical Object|
|Pagination||102 p. :|
|Number of Pages||102|
Where two tectonic plates converge, if one or both of the plates is an oceanic lithosphere, a subduction zone will form. When crust is formed at a mid-ocean ridge, it is hot and buoyant meaning it has a low density. As it spreads away from the ridge and cools and contracts, or becomes denser. A three-dimensional ocean general circulation model, forced by idealized zonal winds, is used to investigate the effect of an abrupt intensification of westerly winds on the subduction process. Four experiments are carried out: 1) a control experiment with standard wind stress forcing, 2) an intensified winds experiment with wind stress that is Cited by:
a standard of comparison for checking or verifying the results of an experiment where all variables must be held constant convection the transfer of thermal energy by movement of a liquid or gas subduction zone the region where two plates collide and one plate sinks below the other. The mooring component of the Subduction Experiment took place in the eastern subtropical North Atlanticbetween June and June (Brink et al. ).A large-scale, five-buoy array was maintained across the eastern flank of the Azores high over two annual by:
In early s the author was also stimulated by Kuno’s work and participated in the studies of magma genesis in island arcs by conducting high-pressure experiments. In this brief article, studies on the origin of subduction zone magmas are briefly reviewed, with special reference to the author’s relevant experimental by: During the to Office of Naval Research-funded Subduction Experiment, designed to examine the descent of near surface water as it moves south in the eastern portion of the subtropical gyre, we tried an approach that appears to provide a first .
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This book is subduction experiment book to the quantitative physical modeling of subduction and subduction-related processes. It presents a coherent description of the modeling method (including similarity criteria, and a novel applied experimental technique), results from model experiments, theoretical analysis of results on the basis of continuum mechanics, and their geodynamic interpretation.
The tectonic framework of the central Java subduction zone is presented in this study. Three marine wide-angle seismic profiles are analyzed by combined forward- and inverse modeling of first and later arrival traveltimes and are integrated together with marine gravity : Andreas Wittwer.
About this book. Subduction dynamics has been actively studied through seismology, mineral physics, and laboratory and numerical experiments. Understanding the dynamics of the subducting slab is critical to a better understanding of the primary societally relevant natural hazards emerging from our planetary interior.
The Subduction Experiment Cruise Report R/V Knorr Cruise Number Leg XV Subduction 3 Mooring Recovery Cruise 13 - 30 June by Richard P. Subduction is the tectonic process at convergent margins by which slabs of oceanic lithosphere descend into the mantle. Previous article in issue: Present-day strain accumulation and slip rates associated with southern San Andreas and eastern California shear zone faults.
Previous article in issue. A Sociology Experiment is designed for instructors teaching Introduction to Sociology (or related courses) who want to assign a uniquely engaging set of chapters written by a diverse group of the best writers and teachers in every area of Sociology.
It is for those who want to integrate supplemental readings, videos, maps, and data from the web. Subducting slabs provide the main driving force for plate motion and flow in the Earth’s mantle1,2,3,4, and geodynamic, seismic and geochemical studies offer insight into slab dynamics and Cited by: The Subduction Experiment Cruise Report RI Oceanus Cruise Number Leg 3 Subduction 1 Mooring Deployment Cruise 17 June - 5 July by Richard P.
Trask Nancy J. Brink DOCUMENT: LIBRARY Woods Hoie Oceanographic. Such settings have resulted in systematic accretionary prism formation from the early Miocene in the Boso-Miura peninsular area to the present in the Sagami Trough area. We modeled the tectonics by a simple sandbox experiment.
Systematic fault and fracture patterns of the oblique subduction type are predicted to occur during arc-arc collision. The Meso-American Subduction Experiment (MASE) and the Cocos Plate Subduction Zone Jean Ball-Meza Works Cited: Ferrari, Luca, Teresa Orozco-Esquivel, Vlad Manea, and Marina Manea.
"The Dynamic History of the Trans-Mexican Volcanic Belt and the Mexico Subduction Zone.". Earthquake Research Institute, The University of Tokyo, TokyoJapan, and Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology, Yokohama, KanagawaJapan.
(A temperature hot enough to melt lithosphere is about a thousand degrees!). This process is called "subduction". Melted crust rises back towards the surface where it helps make volcanoes and islands.
Thus the formation of some volcanoes, mountains, and islands is connected to the process of subduction and continental drift. The second experiment shows the effects of an active basement thrust slice as it enters a subduction zone.
This process may have happened in the eastern Nankai accretionary wedge. Subduction dynamics has been actively studied through seismology, mineral physics, and laboratory and numerical experiments. Understanding the dynamics of the subducting slab is critical to a better understanding of the primary societally relevant natural hazards emerging from our planetary interior, the megathrust earthquakes and consequent tsunamis.
The subject of experimental tectonics is the study of geodynamic processes by means of laboratory scale models. The first roughly scaled experiments were performed by Sir James Hall about two centuries ago, in the intellectual atmosphere generated by the appearance of Hutton's Theory of the Earth (Hutton, J., Theory of the Earth, with Proofs and Illustrations, by: Lecture 24/11/ tectonica sperimentale.
 Three‐dimensional laboratory models of upper mantle subduction are presented investigating the effect of the trench velocity (v t) and the slab to upper mantle viscosity ratio (η SP /η UM) on trench curvature and slab set of experiments varies η SP /η UM from 66 to Another set of experiments modifies v t through applying different velocities at the trailing by: This file contains Supplementary Movie 2 illustrating the progressive evolution of an intermediate-width-slab subduction experiment (W = km) from a three-dimensional perspective.
Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. Regions where this process occurs are known as subduction zones.
Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately.
At low plate thickness (experiment 1, h′ = ; experiment 2, h′ = ; Figure 4b), the subduction velocity is slowed down in a more significant way. The first phase ends after a dimensionless time of while the subduction attains the steady state behavior only after a dimensionless time of MASE - Meso-America Subduction Experiment.
This array consisted of bradband sensors deployed along a km line that runs from Acapulco on the Pacific to near Tampico on the Gulf of Mexico, passing through Mexico City.
The stations al had Guralp 3T broadband sensors ( sec to 50 Hz) and were deployed from /01 to /LAB: EARTHQUAKE DEPTHS AT SUBDUCTION ZONES by Charles Burrows BACKGROUND: A convergent boundary is a boundary between two plates that are moving toward each other, or converging.
Two broad classifications for convergent boundaries are subduction boundaries and collision Size: KB.