• journal_title：Geology
• Contributor：M. Strasser ; M. Kölling ; C. dos Santos Ferreira ; H.G. Fink ; T. Fujiwara ; S. Henkel ; K. Ikehara ; T. Kanamatsu ; K. Kawamura ; S. Kodaira ; M. Römer ; G. Wefer ; R/V Sonne Cruise SO219A ; JAMSTEC Cruise MR12-E01 scientists
• Publisher：Geological Society of America
• Date：2013-08-01
• Format：text/html
• Language：en
• Identifier：10.1130/G34477.1
• journal_abbrev：Geology
• issn：0091-7613
• volume：41
• issue：8
• firstpage：935
• section：Articles

1">We present differential bathymetry and sediment core data from the Japan Trench, sampled after the 2011 Tohoku-Oki (offshore Japan) earthquake to document that prominent bathymetric and structural changes along the trench axis relate to a large (∼27.7 km²) slump in the trench. Transient geochemical signals in the slump deposit and analysis of diffusive re-equilibration of disturbed SO₄^2– profiles over time constrain the triggering of the slump to the 2011 earthquake. We propose a causal link between earthquake slip to the trench and rotational slumping above a subducting horst structure. We conclude that the earthquake-triggered slump is a leading agent for accretion of trench sediments into the forearc and hypothesize that forward growth of the prism and seaward advance of the deformation front by more than 2 km can occur, episodically, during a single-event, large mega-thrust earthquake.