The mechanics of great subduction earthquakes are influenced by the frictional properties, structure, and composition of the plate-boundary fault. We present observations of the structure and composition of the shallow source fault of the 2011 Tohoku-Oki earthquake and tsunami from boreholes drilled by the Integrated Ocean Drilling Program Expedition 343 and 343T. Logging-while-drilling and core-sample observations show a single major plate-boundary fault accommodated the large slip of the Tohoku-Oki earthquake rupture, as well as nearly all the cumulative interplate motion at the drill site. The localization of deformation onto a limited thickness (less than 5 meters) of pelagic clay is the defining characteristic of the shallow earthquake fault, suggesting that the pelagic clay may be a regionally important control on tsunamigenic earthquakes.

Structure and Composition of the Plate-Boundary Slip Zone for the 2011 Tohoku-Oki Earthquake / F. M., Chester; C., Rowe; K., Ujiie; J., Kirkpatrick; C., Regalla; Remitti, Francesca; J. C., Moore; V., Toy; M., Wolfson Schwehr; S., Bose; J., Kameda; J. J., Mori; E. E., Brodsky; N., Eguchi; S., Toczko. - In: SCIENCE. - ISSN 0036-8075. - STAMPA. - 342(2013), pp. 1208-1211. [10.1126/science.1243719]

Structure and Composition of the Plate-Boundary Slip Zone for the 2011 Tohoku-Oki Earthquake

REMITTI, Francesca;
2013

Abstract

The mechanics of great subduction earthquakes are influenced by the frictional properties, structure, and composition of the plate-boundary fault. We present observations of the structure and composition of the shallow source fault of the 2011 Tohoku-Oki earthquake and tsunami from boreholes drilled by the Integrated Ocean Drilling Program Expedition 343 and 343T. Logging-while-drilling and core-sample observations show a single major plate-boundary fault accommodated the large slip of the Tohoku-Oki earthquake rupture, as well as nearly all the cumulative interplate motion at the drill site. The localization of deformation onto a limited thickness (less than 5 meters) of pelagic clay is the defining characteristic of the shallow earthquake fault, suggesting that the pelagic clay may be a regionally important control on tsunamigenic earthquakes.
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1208
1211
Structure and Composition of the Plate-Boundary Slip Zone for the 2011 Tohoku-Oki Earthquake / F. M., Chester; C., Rowe; K., Ujiie; J., Kirkpatrick; C., Regalla; Remitti, Francesca; J. C., Moore; V., Toy; M., Wolfson Schwehr; S., Bose; J., Kameda; J. J., Mori; E. E., Brodsky; N., Eguchi; S., Toczko. - In: SCIENCE. - ISSN 0036-8075. - STAMPA. - 342(2013), pp. 1208-1211. [10.1126/science.1243719]
F. M., Chester; C., Rowe; K., Ujiie; J., Kirkpatrick; C., Regalla; Remitti, Francesca; J. C., Moore; V., Toy; M., Wolfson Schwehr; S., Bose; J., Kameda; J. J., Mori; E. E., Brodsky; N., Eguchi; S., Toczko
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/988304
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