A slump in the trench: Tracking the impact of the 2011 Tohoku-Oki earthquake

被引：64

作者：

Strasser, M. ^{[1
]}

Koelling, M. ^{[2
]}

Ferreira, C. dos Santos ^{[2
]}

Fink, H. G. ^{[2
]}

Fujiwara, T. ^{[3
]}

Henkel, S. ^{[4
]}

Ikehara, K. ^{[5
]}

Kanamatsu, T. ^{[3
]}

Kawamura, K. ^{[6
]}

Kodaira, S. ^{[3
]}

Roemer, M. ^{[2
]}

Wefer, G. ^{[2
]}

机构：

[1] ETH, Inst Geol, CH-8092 Zurich, Switzerland

[2] Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany

[3] Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa 2370061, Japan

[4] Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany

[5] Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Tsukuba, Ibaraki 3058568, Japan

[6] Yamaguchi Univ, Dept Geosphere Sci, Yamaguchi, Yamaguchi 7538512, Japan

来源：

GEOLOGY | 2013年 / 41卷 / 08期

基金：

瑞士国家科学基金会;

关键词：

SUBMARINE LANDSLIDES; RUPTURE; EROSION; SEDIMENTS; MODEL; AXIS;

D O I：

10.1130/G34477.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

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 (similar to 27.7 km(2)) slump in the trench. Transient geochemical signals in the slump deposit and analysis of diffusive re-equilibration of disturbed SO42- 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.

引用

页码：935 / 938

页数：4