TY - JOUR
T1 - A slump in the trench
T2 - Tracking the impact of the 2011 Tohoku-Oki earthquake
AU - R/V Sonne Cruise SO219A
AU - JAMSTEC Cruise MR12-E01 scientists
AU - Strasser, M.
AU - Kölling, M.
AU - dos Santos Ferreira, C.
AU - Fink, H. G.
AU - Fujiwara, T.
AU - Henkel, S.
AU - Ikehara, K.
AU - Kanamatsu, T.
AU - Kawamura, K.
AU - Kodaira, S.
AU - Römer, M.
AU - Wefer, G.
PY - 2013/8
Y1 - 2013/8
N2 - 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 reequilibration of disturbed SO2-4 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.
AB - 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 reequilibration of disturbed SO2-4 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.
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U2 - 10.1130/G34477.1
DO - 10.1130/G34477.1
M3 - Article
AN - SCOPUS:84888773865
SN - 0091-7613
VL - 41
SP - 935
EP - 938
JO - Geology
JF - Geology
IS - 8
ER -