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

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

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)841-844
Number of pages4
Issue number6340
Publication statusPublished - 26 May 2017


Dive into the research topics of 'Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra'. Together they form a unique fingerprint.

Cite this