Silica diagenesis and its effect on interplate seismicity in cold subduction zones

Kameda, J.; Hina, Shoko; Kobayashi, Kyoko; Yamaguchi, Asuka; Hamada, Yohei; Yamamoto, Yuzuru; Hamahashi, Mari; Kimura, Gaku

doi:10.1016/j.epsl.2011.11.041

Cited by 24 publications

(20 citation statements)

References 33 publications

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“…One of the possible scenarios is as follows: first, a slow slip event started at approximately 40-70 km away from the trench and at a depth range of approximately 10-15 km, where a slow slip event potentially occurs because high pore fluid pressure due to the dehydration reaction of underthrust sediments in a cold subduction zone, such as the Japan Trench, is predictable (Kameda et al, 2012). Next, the slow slip event continued to the start of the rupture of the 2011 Tohoku-Oki earthquake with triggering of the M7.3 largest foreshock as well as the moderate earthquakes.…”

Section: The 2011 Slow Slip Event and Coseismic Slip Of The 2011 Tohomentioning

confidence: 99%

Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake

et al. 2013

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Section: The 2011 Slow Slip Event and Coseismic Slip Of The 2011 Tohomentioning

confidence: 99%

Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake

et al. 2013

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“…Although the effective normal stress increases with depth, the swelling pressure increases more rapidly, implying that effective normal stress applied on the fault can be fully supported by the swelling pressure. Because of a low thermal structure of the Japan Trench, smectite-illite transition is suppressed within 100 km distant from the trench Kameda et al 2012), suggesting that the swelling of smectite may have a potential to weaken the wide area of the shallow plate interface. It should be noted, however, that when the temperature increases with depth, the swelling ability of clays may be reduced due to dissolution and collapse of smectite particles (Tessier et al 1998;Schleicher et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Fault weakening caused by smectite swelling

Kameda

Uno

Conin

et al. 2019

Earth Planets Space

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The large slip along the shallow subduction interface during the 2011 Tohoku-Oki earthquake (M w 9.0) caused a huge tsunami that struck the northeast coast of Honshu, Japan. The Integrated Ocean Drilling Program Expedition 343 JFAST program revealed that the fault zone is composed primarily of smectite. Our swelling experiments using the fault material demonstrated that the swelling pressure systematically increases with a decrease in sample porosity. Based on in situ porosity estimations in the IODP borehole, the swelling pressure of the fault is as high as 8 MPa, which is comparable to the effective normal stress at the drill site (~ 7 MPa). This also suggests that the modified effective confining pressure of the fault is quite low or potentially zero, meaning that fault strength is governed mainly by cohesion rather than frictional strength. The fault may therefore be intrinsically weak, which could enhance the coseismic displacement toward the trench when earthquake slip propagates from depth. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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“…The fabric of the breccia indicates that a large competence contrast between chert clasts and siliceous mudstone matrix existed during deformation. If an abnormal fluid pressure reaches near the lithostatic value in a certain horizon, hydro‐fracturing occurs (Kameda et al, ). It is therefore referred to in this study as a hydraulic breccia and is thought to be due to localized overpressure.…”

Section: Discussionmentioning

confidence: 99%

Radiolarian‐based study on the fabric and the formation process of the Early Cretaceous mélange near Zhongba, Yarlung–Tsangpo Suture Zone, southern Tibet

Matsuoka

et al. 2018

Island Arc

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The Yarlung–Tsangpo Suture Zone (YTSZ), as the southernmost and youngest among the sutures that subdivides the Tibetan Plateau into several east–west trending blocks, marks where the Neo‐Tethys was consumed as the Indian continent moved northward and collided against the Eurasian continent. Mélanges in the YTSZ represent the remnants of the oceanic plate through subduction and collision. Mélanges are characterized by a highly sheared volcanoclastic or siliceous mudstone matrix including blocks of chert, claystone, and basalt. Detailed radiolarian analyses are conducted on the mélange near Zhongba County. Macroscopic, mesoscopic, and microscopic observations are combined in order to elucidate the relationships among age, lithology, and structure of blocks in the mélange. Reconstructed ocean plate stratigraphy includes Lower Jurassic limestone within the chert sequence accumulated at a depth near the CCD (Unit 2), Upper Jurassic thin‐bedded chert interbedded with claystone deposited in the wide ocean basin (Unit 3), and Lower Cretaceous chert with siliceous mudstone (Units 4 and 5), representing the middle parts of ocean plate stratigraphy. The results highlight the fabric of brecciated chert on mesoscopic scale, which is thought to be due to localized overpressure. The formation of mesoscopic and microscopic block‐in‐matrix fabrics in the mélange is proposed for the chert and siliceous mudstone bearing different extents of consolidation and competence during the progressive deformation of accreted sediments at shallow‐level subduction.

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Silica diagenesis and its effect on interplate seismicity in cold subduction zones

Cited by 24 publications

References 33 publications

Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake

Episodic slow slip events in the Japan subduction zone before the 2011 Tohoku-Oki earthquake

Fault weakening caused by smectite swelling

Radiolarian‐based study on the fabric and the formation process of the Early Cretaceous mélange near Zhongba, Yarlung–Tsangpo Suture Zone, southern Tibet

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