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，日本海上的Nankai accreative Prism是一项最雄心勃勃的研究项目——NanTroSeize项目的一个阶段，该项目旨在了解浅层非立管和深立管钻孔的断层和地震发生的基本过程。IODP 315和316考察队考察了浅层锋面逆冲和一个主要活动的展断层的上盘，记录了发震带前面和上面的近地表活动变形。本文提出了南开增生楔的变形分区反映了所涉及的岩石产生地震断裂和相关海啸的能力的假设。在大型地震事件中，增生楔中的脆性断层是否能够产生剧烈的地表断裂，或者岩石是否更易于缓慢、稳定的滑动、应变减弱和大体积内变形的分布？我们通过进行一系列的变形实验来研究这个问题，这些实验将提供来自岩心的泥浆和泥岩的强度、应力路径和孔隙压力演化的数据。为了覆盖钻探已经和可能无法到达的部分，我们通过研究两个陆地上重要的模拟案例：石曼托带和博佐吸积楔的样本来补充南开数据库。自然和实验变形结构和织物的比较将指导实验室数据向自然情况的外推。

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