Huepers, A;
Torres, ME;
Owari, S;
McNeill, LC;
Dugan, B;
Henstock, TJ;
Milliken, KL;
... Zhao, X; + view all
(2017)
Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra.
Science
, 356
(6340)
pp. 841-844.
10.1126/science.aal3429.
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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.
| Type: | Article |
|---|---|
| Title: | Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/science.aal3429 |
| Publisher version: | http://doi.org/10.1126/science.aal3429 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, ANDAMAN EARTHQUAKE, PORE PRESSURE, ZONE, MEGATHRUST, RUPTURE, SEDIMENTS, STRESS, PRISM, MODEL |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1565566 |
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