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Vannucchi, P.; Ujiie, Kohtaro; Nicole, Stroncik; Malinverno, Alberto; Arroyo, Ivonne G.; Barckhausen, Udo; Conin, Marianne; Foley, Susan Murr; Formolo, Michael J; Harris, Robert N.; Heuret, Arnauld; Huftile, Gary J.; Kameda, J.; Kim, Gil Young; Kutterolf, Steffen; Martino, A. J.; McCay, Gilian A.; Nuzzo, Marianne; Ohkushi, Ken’ichi; Saito, Saneatsu; Sak, Peter B.; Solomon, E. A.; Torres, Marta E; Tsutsumi, Akito; Uno, Masaoki; Usui, Yoichi; Yatheesh, V.; Yamamoto, Yuzuru; Zhao, Xianzheng; Zhu, Junjiang

doi:10.2204/iodp.pr.334.2011

Cited by 5 publications

(2 citation statements)

References 79 publications

(136 reference statements)

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“…GPS measurements on land indicate that over the subducted Cocos Ridge most of the plate interface in the seismogenic region is essentially fully locked (Dixon, 2003;LaFemina et al, 2009). In contrast, seismic profiles indicate fault geometries (i.e., angles between forethrusts, backthrusts, and the décollement) that suggest low values of plate boundary friction (von Huene et al, 2000(von Huene et al, , 2004von Huene and Ranero, 2003).…”

Section: Seismogenic Zone and Earthquakesmentioning

confidence: 99%

“…The ridge stands 2.5 km high and is characterized by a distinctive Galapagos-type geochemistry. The area just northwest of the EPR/CNS plate suture (Barckhausen et al, 2001) was drilled during Deep Sea Drilling Project (DSDP) Leg 84 and Ocean Drilling Program (ODP) Legs 170 and 205 (Kimura, Silver, Blum, et al, 1997;Shipboard Scientific Party, 1985, 2003. Sills with a Galapagos-type geochemistry were cored at ODP Sites 1039 and 1253, indicating the great lateral extent of hotspot magma intrusion.…”

Section: Background the Cocos Ridge And Subducting Platementioning

confidence: 99%

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2012

IODP Scientific Prospectus

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Section: Seismogenic Zone and Earthquakesmentioning

confidence: 99%

Section: Background the Cocos Ridge And Subducting Platementioning

confidence: 99%

Untitled

2012

IODP Scientific Prospectus

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Contrasts in physical properties between the hanging wall and footwall of an exhumed seismogenic megasplay fault in a subduction zone—An example from the Nobeoka Thrust Drilling Project

Hamahashi

Saito

Kimura

et al. 2013

Geochem Geophys Geosyst

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[1] We examined the physical properties of an exhumed and fossilized subduction zone megasplay fault by analyzing geophysical logging data obtained by the Nobeoka Thrust Drilling Project, which provide a high-resolution transect of properties across the main fault zone. The footwall cataclasite exhibits higher averages of neutron porosity (7.6%) and lower values of electric resistivity (232 Xm) compared to the hanging wall phyllite (4.8%, 453 Xm). This clear contrast between the hanging wall and footwall may account for the difference in maximum burial and structural variation. Despite the contrast observed between the hanging wall and footwall in macroscopic scale, the resistivity and porosity data from both the hanging wall and footwall can be fit with a single curve using Archie's law, suggesting the similarities in microstructures and mineralogy in this low porosity range. Above the main fault core of the Nobeoka Thrust a brittle damage zone in the hanging wall contains pseudotachylyte as evidence of the seismogenic slip and does not follow Archie's law. Damage zones in the hanging wall are also observed in the modern splay fault at shallow depth in the Nankai Trough but with much thicker width, whereas the footwall damage zone is more extensive in the Nobeoka Thrust. Splay faults may exhibit strong deformation in the hanging wall in the early stage, and as fault rocks get buried deeper and as displacement and physical property contrast increase across the fault, the damage effect may eventually be enlarged in the footwall.

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