Natural and experimental faulting of rocks, Nankai Accretionary Prism. Follow-up work to lODP Expeditions 315 and 316.

岩石的自然和实验断层，南开增生棱镜。

• 批准号: 143279666
• 负责人: Professor Dr. Jan-Hinrich Behrmann
• 金额: --
• 依托单位: Institut für Geowissenschaften und Geographie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/143279666?language=en
• 关键词: Natural; experimental; faulting; rocks; Nankai

Presently the Nankai Accretionary Prism offshore Japan is the stage of a most ambitious research venture, the NanTroSeize Project, geared at understanding fundamental processes of faulting and earthquake generation in a transect of shallow non-riser and deep riser drillholes. IODP Expeditions 315 and 316 investigated the shallow frontal thrusts, and the hangingwall to a major active splay fault, to document near-surface active deformation in front of, and above the seismogenic zone. Here we advance the hypothesis that the partitioning of deformation in the Nankai accretionary wedge reflects the capability of the rocks involved to generate seismic faulting and related tsunamis. Is brittle faulting in the accretionary wedge in response to a large seismic event capable of producing dramatic surface breaks, or are the rocks more amenable to slow, stable slip, strain weakening, and distribution of deformation within large volumes? We investigate this by conducting a series of deformation experiments that will provide data on strength, stress paths, and pore pressure evolution in muds and mudstones from the drill cores. To cover those parts that were, and possibly will not be reached by the drilling, we have supplemented the Nankai data base by studying samples from two important analogue cases on land: the Shimanto Belt and the Bozo accretionary wedge. Comparison of natural and experimental deformation structures and fabrics will guide extrapolation of the laboratory data to the natural case.

目前，日本近海的南海增生棱镜是最雄心勃勃的研究项目NantroSeize项目的一个阶段，该项目旨在了解浅非立管和深立管钻孔横断面中断层和地震发生的基本过程。IODP第315和316远征队调查了浅层前缘逆冲断层和一个主要活动展布断层的上盘，以记录孕震区前方和上方的近地表活动变形。在这里，我们提出的假设，在南海增生楔变形的分区反映了有关的岩石产生地震断层和相关的海啸的能力。在增生楔中的脆性断层是对大地震事件的反应，能够产生剧烈的表面破裂，还是岩石更容易缓慢、稳定地滑动、应变减弱和变形分布在大体积内？我们进行了一系列的变形实验，将提供数据的强度，应力路径，并在泥浆和泥岩的钻孔岩芯孔隙压力的演变进行调查。为了覆盖那些已经被钻探到的部分，以及可能不会被钻探到的部分，我们通过研究来自陆地上两个重要的类似案例的样本来补充南开数据库：Shimanto带和Bozo增生楔。自然和实验变形结构和组构的比较将指导实验室数据外推到自然情况。

项目成果

Strong sediments at the deformation front, and weak sediments at the rear of the Nankai accretionary prism, revealed by triaxial deformation experiments

• DOI: 10.1002/ggge.20290
• 发表时间: 2013-11
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: M. Stipp;Malte Rolfs;Y. Kitamura;J. Behrmann;K. Schumann;D. Schulte‐Kortnack;V. Feeser

P and S wave velocity measurements of water‐rich sediments from the Nankai Trough, Japan

• DOI: 10.1002/2013jb010290
• 发表时间: 2014-02
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: K. Schumann;M. Stipp;J. Behrmann;D. Klaeschen;D. Schulte‐Kortnack

Texture development in naturally compacted and experimentally deformed silty clay sediments from the Nankai Trench and Forearc, Japan

• DOI: 10.1016/j.tecto.2014.08.005
• 发表时间: 2014-12
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: K. Schumann;M. Stipp;B. Leiss;J. Behrmann

Geotechnical behavior of mudstones from the Shimanto and Boso accretionary complexes, and implications for the Nankai accretionary prism

四万十和房总增生杂岩泥岩的岩土工程行为及其对南开增生棱柱的影响

• DOI: 10.1186/1880-5981-66-129
• 发表时间: 2014
• 期刊: Earth, Planets and Space
• 作者: Schumann;Behrmann;Yamamoto;Kitamura
• 通讯作者: Kitamura