Out‐of‐sequence thrust faults developed in the coseismic slip zone of the 1946 Nankai Earthquake (Mw=8.2) off Shikoku, southwest Japan

Park, Jin-Oh; Tsuru, Takeshi Go; Kodaira, Shuichi; Nakanishi, Ayako; Miura, Seiichi; Kaneda, Yasufumi; Kono, Yoshiteru; Takahashi, Narumi

doi:10.1029/1999gl008443

Cited by 54 publications

(36 citation statements)

References 13 publications

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“…Within this accretionary complex, several out-of-sequence thrust faults accommodate horizontal compressive deformation (Song et al, 2011). NanTroSEIZE drilling focuses on the Kumano transect, south of Kii Peninsula (Honshu island), located in the 1944 Tonankai earthquake rupture area (Baba and Cummins, 2005;Park et al, 2000). 2009a, 2009b, 2009c, 2009dTobin et al, 2009), and 333 (Holes C0011D, C0012C and C0012E;see Expedition 333 Scientists, 2012a, 2012b (Fig.…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 97%

Texture development in naturally compacted and experimentally deformed silty clay sediments from the Nankai Trench and Forearc, Japan

2014

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Section: Geological Setting and Sample Descriptionmentioning

confidence: 97%

Texture development in naturally compacted and experimentally deformed silty clay sediments from the Nankai Trench and Forearc, Japan

2014

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“…Although the updip limit of coseismic rupture zone estimated from these paleoseismic studies disagrees with thermally constrained locked zone [e.g., Hyndman et al, 1995], the downdip limit is consistent with the location of 350°C limit. The crustal structure deduced from wideangle seismic survey across the offshore Oregon and Washington margin [Parsons et al, 1998] shows that the top of the slab beneath the downdip limit is at 25 -30 km depth. As has been noted, it seems to be similar to regularities of crustal structure at the updip and downdip limits of several subduction seismogenic zones.…”

Section: Comparison Of Subduction Seismogenic Zones With Great Interpmentioning

confidence: 99%

Crustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone

Takahashi²,

et al. 2002

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[1] Differences in the coseismic rupture process between the 1944 Tonankai and the 1946 Nankai earthquakes have been studied by many fault models. To understand what factors control coseismic rupture zones, it is important to investigate differences in deep crustal structures of the rupture zones between the 1944 and 1946 earthquakes. The previously published crustal structure of the rupture zone of the 1946 earthquake shows that the coseismic rupture extends to the Neogene-Quaternary accretionary prism. However, little is known about the structure of the rupture zone of the 1944 earthquake. To obtain a complete image of the seismogenic zone of the 1944 earthquake, a wide-angle seismic survey was performed across the presumed coseismic rupture zone of the 1944 earthquake from ocean to land. Our model for the crustal structure is based on ocean bottom seismographic data. The crustal structure appears characteristic for subducting oceanic crust and a Neogene-Quaternary accretionary prism bounded by an island arc crust. The Neogene-Quaternary accretionary prism reaches a maximum thickness of 7 km at 50 km distance landward from the deformation front. The subducting oceanic crust can be traced down to 35 km. The subduction angle becomes steeper landward, reaching up to 11°beneath the island arc crust. The depth of the top of subducting oceanic crust at the downdip limit of the rupture zone is 23 km, while the updip limit is located beneath the island arc upper crust. Similar structures of the updip and downdip limits are also published for several other subduction zones.

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“…Out-of-sequence thrusts can be straight (Mukherjee et al 2012), almost uniformly curved (Arita et al 1997, fig. 1), or sigmoid-shaped in structural cross-sections (Park et al 2000). Out-of-sequence thrusts may occur randomly in a deforming crustal wedge (Rajendran & Rajendran 2011).…”

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A review on out-of-sequence deformation in the Himalaya

Mukherjee

2015

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Out‐of‐sequence thrust faults developed in the coseismic slip zone of the 1946 Nankai Earthquake (Mw=8.2) off Shikoku, southwest Japan

Cited by 54 publications

References 13 publications

Texture development in naturally compacted and experimentally deformed silty clay sediments from the Nankai Trench and Forearc, Japan

Texture development in naturally compacted and experimentally deformed silty clay sediments from the Nankai Trench and Forearc, Japan

Crustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone

A review on out-of-sequence deformation in the Himalaya

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