Scientific Drilling

Henry, Pierre; Kanamatsu, Toshiya; Moe, Kyaw Thu; Strasser, Michael

doi:10.2204/iodp.sd.14.01.2012

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…[8] Although recovery of the sedimentary section from Site C0011 over the course of Expeditions 322 and 333 was incomplete, lithostratigraphic units were successfully correlated with C0012 [Henry et al, 2012a]. The major lithologies of Sites C0011 and C0012 are hemipelagic deposits with volcanic ash (Unit I), alternating silty claystone and volcaniclastic tuffaceous sandstone (Unit II), hemipelagic deposits lacking in ash (Unit III), a turbidite facies (Unit IV), and a volcaniclastic unit (Unit V); all are Miocene age or younger.…”

Section: Kumano Transect Reference Sites C0011 and C0012mentioning

confidence: 99%

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Shear strength of sediments approaching subduction in the Nankai Trough, Japan as constraints on forearc mechanics

Ikari

Hüpers

Kopf

2013

Geochem Geophys Geosyst

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[1] The mechanical behavior of the plate boundary fault zone is of paramount importance in subduction zones, because it controls megathrust earthquake nucleation and propagation as well as the structural style of the forearc. In the Nankai area along the NanTroSEIZE (Kumano) drilling transect offshore SW Japan, a heterogeneous sedimentary sequence overlying the oceanic crust enters the subduction zone. In order to predict how variations in lithology, and thus mechanical properties, affect the formation and evolution of the plate boundary fault, we conducted laboratory tests measuring the shear strengths of sediments approaching the trench covering each major lithological sedimentary unit. We observe that shear strength increases nonlinearly with depth, such that the (apparent) coefficient of friction decreases. In combination with a critical taper analysis, the results imply that the plate boundary position is located on the main frontal thrust. Further landward, the plate boundary is expected to step down into progressively lower stratigraphic units, assisted by moderately elevated pore pressures. As seismogenic depths are approached, the decollement may further step down to lower volcaniclastic or pelagic strata but this requires specific overpressure conditions. High-taper angle and elevated strengths in the toe region may be local features restricted to the Kumano transect.Components: 9,385 words, 7 figures.

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Section: Kumano Transect Reference Sites C0011 and C0012mentioning

confidence: 99%

“…Lithostratigraphy (left column), measurements of maximum and residual shear strength (middle column) and measurements of maximum and residual apparent friction (right column) for intact samples at in situ effective stress conditions (right column) for Site C0011. The lithostratigraphic column is modified fromHenry et al [2012a].…”

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confidence: 99%