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Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra

Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra
Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra
Plate-boundary fault rupture during the 2004 Sumatra-Andaman subduction earthquake extended closer to the trench than expected, increasing earthquake and tsunami size. International Ocean Discovery Program Expedition 362 sampled incoming sediments offshore northern Sumatra, revealing recent release of fresh water within the deep sediments. Thermal modeling links this freshening to amorphous silica dehydration driven by rapid burial-induced temperature increases in the past 9 million years. Complete dehydration of silicates is expected before plate subduction, contrasting with prevailing models for subduction seismogenesis calling for fluid production during subduction. Shallow slip offshore Sumatra appears driven by diagenetic strengthening of deeply buried fault-forming sediments, contrasting with weakening proposed for the shallow Tohoku-Oki 2011 rupture, but our results are applicable to other thickly sedimented subduction zones including those with limited earthquake records.
0036-8075
841-844
Hüpers, Andre
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Torres, Marta E.
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Owari, Satoko
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Mcneill, Lisa C.
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Dugan, Brandon
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Henstock, Timothy J.
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Milliken, Kitty L.
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Petronotis, Katerina E.
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Backman, Jan
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Bourlange, Sylvain
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Chemale, Farid
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Chen, Wenhuang
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Colson, Tobias A.
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Frederik, Marina C. G.
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Guèrin, Gilles
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Hamahashi, Mari
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House, Brian M.
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Jeppson, Tamara N.
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Kachovich, Sarah
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Kenigsberg, Abby R.
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Kuranaga, Mebae
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Kutterolf, Steffen
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Mitchison, Freya L.
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Mukoyoshi, Hideki
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Nair, Nisha
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Pickering, Kevin T.
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Pouderoux, Hugo F. A.
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Shan, Yehua
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Song, Insun
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Vannucchi, Paola
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Vrolijk, Peter J.
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Yang, Tao
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Zhao, Xixi
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Hüpers, Andre
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Torres, Marta E.
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Owari, Satoko
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Mcneill, Lisa C.
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Dugan, Brandon
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Henstock, Timothy J.
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Milliken, Kitty L.
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Petronotis, Katerina E.
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Backman, Jan
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Bourlange, Sylvain
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Chemale, Farid
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Chen, Wenhuang
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Colson, Tobias A.
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Frederik, Marina C. G.
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Guèrin, Gilles
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Hamahashi, Mari
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House, Brian M.
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Jeppson, Tamara N.
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Kachovich, Sarah
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Kenigsberg, Abby R.
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Kuranaga, Mebae
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Kutterolf, Steffen
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Mitchison, Freya L.
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Mukoyoshi, Hideki
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Nair, Nisha
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Pickering, Kevin T.
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Pouderoux, Hugo F. A.
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Shan, Yehua
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Song, Insun
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Vannucchi, Paola
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Vrolijk, Peter J.
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Yang, Tao
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Zhao, Xixi
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Hüpers, Andre, Torres, Marta E., Owari, Satoko, Mcneill, Lisa C., Dugan, Brandon, Henstock, Timothy J., Milliken, Kitty L., Petronotis, Katerina E., Backman, Jan, Bourlange, Sylvain, Chemale, Farid, Chen, Wenhuang, Colson, Tobias A., Frederik, Marina C. G., Guèrin, Gilles, Hamahashi, Mari, House, Brian M., Jeppson, Tamara N., Kachovich, Sarah, Kenigsberg, Abby R., Kuranaga, Mebae, Kutterolf, Steffen, Mitchison, Freya L., Mukoyoshi, Hideki, Nair, Nisha, Pickering, Kevin T., Pouderoux, Hugo F. A., Shan, Yehua, Song, Insun, Vannucchi, Paola, Vrolijk, Peter J., Yang, Tao and Zhao, Xixi (2017) Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra. Science, 356 (6340), 841-844. (doi:10.1126/science.aal3429).

Record type: Article

Abstract

Plate-boundary fault rupture during the 2004 Sumatra-Andaman subduction earthquake extended closer to the trench than expected, increasing earthquake and tsunami size. International Ocean Discovery Program Expedition 362 sampled incoming sediments offshore northern Sumatra, revealing recent release of fresh water within the deep sediments. Thermal modeling links this freshening to amorphous silica dehydration driven by rapid burial-induced temperature increases in the past 9 million years. Complete dehydration of silicates is expected before plate subduction, contrasting with prevailing models for subduction seismogenesis calling for fluid production during subduction. Shallow slip offshore Sumatra appears driven by diagenetic strengthening of deeply buried fault-forming sediments, contrasting with weakening proposed for the shallow Tohoku-Oki 2011 rupture, but our results are applicable to other thickly sedimented subduction zones including those with limited earthquake records.

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Huepers_et_al_FINAL_plus_figs - Accepted Manuscript
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Accepted/In Press date: 28 April 2017
e-pub ahead of print date: 26 May 2017
Organisations: Ocean and Earth Science, Geology & Geophysics, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 410539
URI: http://eprints.soton.ac.uk/id/eprint/410539
ISSN: 0036-8075
PURE UUID: e7dfb5fc-6d5b-4b1b-ad46-4bca22104404
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514

Catalogue record

Date deposited: 09 Jun 2017 09:03
Last modified: 20 Feb 2021 05:01

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Contributors

Author: Andre Hüpers
Author: Marta E. Torres
Author: Satoko Owari
Author: Lisa C. Mcneill
Author: Brandon Dugan
Author: Kitty L. Milliken
Author: Katerina E. Petronotis
Author: Jan Backman
Author: Sylvain Bourlange
Author: Farid Chemale
Author: Wenhuang Chen
Author: Tobias A. Colson
Author: Marina C. G. Frederik
Author: Gilles Guèrin
Author: Mari Hamahashi
Author: Brian M. House
Author: Tamara N. Jeppson
Author: Sarah Kachovich
Author: Abby R. Kenigsberg
Author: Mebae Kuranaga
Author: Steffen Kutterolf
Author: Freya L. Mitchison
Author: Hideki Mukoyoshi
Author: Nisha Nair
Author: Kevin T. Pickering
Author: Hugo F. A. Pouderoux
Author: Yehua Shan
Author: Insun Song
Author: Paola Vannucchi
Author: Peter J. Vrolijk
Author: Tao Yang
Author: Xixi Zhao

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