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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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Japan (2)
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Europe
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Central Europe
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Switzerland
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Lake of Zurich (1)
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NanTroSEIZE
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Expedition 316
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IODP Site C0007 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Japan Trench (1)
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Kumano Basin (1)
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Nankai Trough (2)
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West Pacific
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Northwest Pacific
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Japan Trench (1)
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Kumano Basin (1)
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Nankai Trough (2)
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elements, isotopes
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isotope ratios (1)
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isotopes
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radioactive isotopes
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Pb-210 (1)
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stable isotopes
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O-18/O-16 (1)
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S-34/S-32 (1)
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metals
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iron (1)
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lead
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Pb-210 (1)
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oxygen
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O-18/O-16 (1)
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sulfur
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S-34/S-32 (1)
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geologic age
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Cenozoic
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Quaternary
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upper Quaternary (1)
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metamorphic rocks
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turbidite (1)
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Primary terms
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Asia
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Far East
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Japan (2)
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Cenozoic
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Quaternary
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upper Quaternary (1)
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deformation (1)
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earthquakes (2)
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Europe
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Central Europe
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Switzerland
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Lake of Zurich (1)
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faults (1)
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geochemistry (1)
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geophysical methods (3)
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ground water (1)
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Integrated Ocean Drilling Program
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Expedition 316
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IODP Site C0007 (1)
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isotopes
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radioactive isotopes
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Pb-210 (1)
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stable isotopes
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O-18/O-16 (1)
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S-34/S-32 (1)
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metals
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iron (1)
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lead
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Pb-210 (1)
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ocean floors (2)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Japan Trench (1)
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Kumano Basin (1)
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Nankai Trough (2)
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West Pacific
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Northwest Pacific
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Japan Trench (1)
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Kumano Basin (1)
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Nankai Trough (2)
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sediments
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marine sediments (2)
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slope stability (1)
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sulfur
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S-34/S-32 (1)
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sedimentary rocks
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turbidite (1)
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sediments
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sediments
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marine sediments (2)
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turbidite (1)
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Abstract New, high-resolution multi-beam bathymetric data from RV Sonne cruise SO251 show a widely variable surface morphology along the southern Kumano Basin and Nankai accretionary prism off SW Japan. Combined with a three-dimensional seismic volume, these data provide insight into the ubiquitous and varied nature of faulting typical of accretionary prism settings, a high number of submarine landslides across the entire study area that vary both spatially and temporally, a pronounced absence of slide deposit bathymetric manifestations, widely varied slope angles and a potential subducted seamount scar. We have mapped scars of 442 primary and 184 secondary landslides and have measured the areas evacuated by these slides. Most of the slides are completely disintegrative, so surficial landslide deposits are almost absent. The incidence with which temporally sequential slope failures and fault structures cross-cut themselves and one another provides evidence of potential failure pre-conditioning such as gas hydrates, pore fluid overpressures and bottom current activity. Seismic loading and slope over-steepening are then the most likely final trigger mechanisms to slope failure. The majority of observed landslides (64%) occur seawards of the outer ridge, providing insight into the relationship between surficial landsliding and subsurface tectonic processes along this accretionary prism.
Abstract New high-resolution surveying techniques allow subaqueous geomorphology to be investigated in great detail. Such analyses are important as the morphologies are often indicative of past processes, including mass movements. For peri-alpine Lake Zurich, many mass-wasting events have occurred in the past millennia. While the ages of these events are known from past studies on the respective deposits in the lake basin, the surface expressions and distribution of the respective features on the slopes have not been extensively described. Here we quantitatively characterize the morphologic features on the entire lake floor. A total of 50 subaqueous landslides are morphologically identified in a high-resolution digital bathymetric model (DBM), mapped and characterized using a geographic information system (GIS). Many slides show relatively small erosion areas (<0.05 km 2 ) and are located in shallow water (<10 m water depth). The roughness of the individual landslide-translation areas is quantified using the standard deviation of a measure called bathymetric position index (BPI) and related to the slides ages. The DBM allows the detection of traces of mass-movements dating back to c. 5000 cal years BP. Our results demonstrate that morphometric analyses on a high-resolution DBM can contribute to a better understanding of sublacustrine mass movements.
Sediment mobilization deposits from episodic subsurface fluid flow—A new tool to reveal long-term earthquake records?
A slump in the trench: Tracking the impact of the 2011 Tohoku-Oki earthquake
Oxidative sulfur cycling in the deep biosphere of the Nankai Trough, Japan
Abstract Bryomol carbonates, composed of bryozoans and molluscs, are found in non-tropical shelf and upper slope settings where they are sensitive indicators of oceanographic conditions. Few modern bryomol carbonate settings have been investigated to date, despite their importance in the Phanerozoic rock record. Furthermore, no detailed facies mapping and long-term oceanographic observations have been undertaken in modern bryomol settings, even though this is important for accurately interpreting facies, climate and oceanography from fossil bryomol carbonates. A bryomol carbonate factory on the western margin of the northern Gulf of California, Mexico was selected for an integrated high-resolution in situ oceanographic monitoring, acoustic seafloor mapping, sediment and bryozoan growth morphology study. Molluscan- (28%), bryozoan- (25%) and barnacle- (14%) dominated carbonate production takes place under normal saline warm-temperate eutrophic conditions, with average near sea surface temperatures of 20°C. Even though temperatures are unusually warm for the formation of bryomol carbonates, they develop as a result of prevailing eutrophic conditions (average chlorophyll- a contents of 2.2 mg chl- a m -3 ). Eutrophic conditions provide ample food to heterotrophic calcifiers and largely exclude faster-growing phototrophic organisms by drastically restricting the depth of the euphotic zone and, therefore, water clarity. Thus, the presence of high amounts of nutrients can generate cool-water-type carbonate assemblages at temperatures where a warm-water association would be expected.