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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
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Honshu
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Chiba Peninsula (1)
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NanTroSEIZE
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Expedition 322 (1)
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Expedition 333 (1)
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IODP Site C0011 (1)
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IODP Site C0012 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Nankai Trough (1)
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Shikoku Basin (1)
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West Pacific
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Northwest Pacific
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Nankai Trough (1)
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Shikoku Basin (1)
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geologic age
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Cenozoic
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Quaternary
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Kazusa Group (1)
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Pleistocene (1)
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Tertiary
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Neogene
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Pliocene (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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granites (1)
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volcanic rocks
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basalts (1)
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Primary terms
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Asia
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Far East
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Japan
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Honshu
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Chiba Peninsula (1)
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Cenozoic
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Quaternary
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Kazusa Group (1)
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Pleistocene (1)
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Tertiary
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Neogene
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Pliocene (1)
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crust (1)
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deformation (2)
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heat flow (1)
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igneous rocks
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plutonic rocks
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granites (1)
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volcanic rocks
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basalts (1)
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Integrated Ocean Drilling Program
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Expedition 322 (1)
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Expedition 333 (1)
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IODP Site C0011 (1)
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IODP Site C0012 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific
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Nankai Trough (1)
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Shikoku Basin (1)
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West Pacific
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Northwest Pacific
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Nankai Trough (1)
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Shikoku Basin (1)
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plate tectonics (1)
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sedimentary rocks
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clastic rocks
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sandstone (1)
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siltstone (1)
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sediments (1)
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slope stability (1)
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structural analysis (1)
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tectonics (2)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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sandstone (1)
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siltstone (1)
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sediments
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sediments (1)
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Formation of excess fluid pressure, sediment fluidization and mass-transport deposits in the Plio-Pleistocene Boso forearc basin, central Japan
Abstract Analyses of consolidation state, fabrics and physical properties were conducted on rock samples from the Plio-Pleistocene Boso forearc basin, central Japan. Consolidation tests identified that the trend in consolidation yield stress was systematically 8 MPa smaller than expected for the overburden from the sediment thickness of the Kazusa Group. An excess fluid pressure interval was also identified in the lower part of the basin fill, where several large-scale (several kilometres in length and several tens of metres thick) mass-transport deposits (MTDs) are intercalated. This interval is characterized by high porosity and small consolidation yield stresses, indicating that consolidation had been retarded by the excess fluid pressure. The estimated excess fluid pressure was c. 5–7 MPa. In addition, outcrop-scale fluidization and minor liquefaction features were identified within and below the high fluid pressure interval. The excess fluid pressure reduced the effective stress in the Boso forearc basin and, subsequently, the stability of the slope, allowing small tectonic events to generate submarine landslides. Therefore, the formation of these large-scale MTDs was probably related to the excess fluid-pressure generation.
ABSTRACT Knowledge of rock thermal conductivity is necessary to understand the thermal structure in active seismogenic zones such as the Nankai Trough subduction zone, SW Japan. To estimate in situ thermal conductivity at the oceanic crust surface in the seismogenic zone, we measured the thermal conductivity of a basaltic basement core sample retrieved from subducting oceanic basement at the Nankai Trough Seismogenic Zone Experiment input site C0012 under high temperature (maximum 160 °C) and high pressure (maximum effective pressure 100 MPa), respectively. These conditions correspond to the in situ temperature and pressure at the oceanic crust surface in the updip limit of the Nankai seismogenic zone (~7 km below the seafloor). Thermal conductivity of the oceanic basalt is both temperature and pressure dependent. In contrast to other rock types such as sandstone and granite, for which thermal conductivity decreases with increasing temperature, the thermal conductivity of the oceanic basalt increased with increasing ambient temperature. The thermal conductivity of the basalt also increased with increasing effective pressure; however, the rate of increase was much lower than that for other rocks. These new temperature and pressure effect data for oceanic crust basalt fill a gap in the research. The estimated thermal conductivity of the basalt at in situ temperature and pressure conditions was less than ~2 W m –1 K –1 , although deformation and alteration associated with subduction could decrease pore spaces in the basalt, leading to enhanced thermal conductivity. This value is significantly lower than that typically assumed for thermal structure simulations in the Nankai subduction zone.