Dynamics of fault gauge during seismic forcal process

地震力过程中断层规的动力学

• 批准号: 13640427
• 负责人: NAKAGAWA Koichi
• 金额: $ 1.92万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640427/
• 关键词: gauge; lattice strain; shear-induce polarization (SIP); electric double layer; active fault; streaming potential; dilatancy; electromagnetic anomaly; ガウジ; 石英; 電気的分極; 野島断層

We have investigated the physical properties of gauges samples collected from the crops of several active faults such as the Atotsugawa F., Yanagase F., Gosukebashi F. and Nojima F. The purpose the study is to understand the behavior of gauge under stress field at deep zone. We have carried out some fundamental experiments such as grain-size analysis, lattice strain analysis of the included minerals, measurements of seismic wave velocities and shear strength etc. using gauge samples. Grain-size distribution of common gauge materials is found to a widely from 10 rnm to 1mm under electron microscope. This means that gauge is very compressible under high confining pressure and can be dilatant under shear deformation. The dilatancy will help gauge increase the strength by the strain near the depth of seismic source.The magnitude of lattice strain of quartz and illite minerals were determined using X-ray diffraction analysis and found to be significantly large compared with the same kind of minerals formed in stress-free environment.On the other hand, many clay materials showed electric polarization associated with shear deformation. This phenomenon could not be explained. The mechanism of this Shear-Induced Polarization (SIP) is considered to be related to the physicochemical characteristics of the absorbed water layer contacting the finer grain surface.

我们研究了从几个活动断层（如Atotsugawa F.，柳濑F.，五辅桥湾和Nojima F.研究的目的是了解应变片在深部应力场下的行为。我们利用规范样品进行了粒度分析、包裹体矿物的晶格应变分析、地震波速度和抗剪强度测定等基础实验。在电子显微镜下发现，常用应变片材料的晶粒尺寸分布在10 ~ 1 mm之间。这意味着在高围压下，压力计是非常可压缩的，并且在剪切变形下是可压缩的。通过X射线衍射分析，发现石英和伊利石矿物的晶格应变值明显大于无应力环境下形成的同类矿物，而许多粘土材料则表现出与剪切变形有关的电极化现象。这种现象无法解释。这种剪切诱导极化（SIP）的机制被认为是有关的物理化学特性的吸收水层接触较细的颗粒表面。

项目成果

Rashed M.: "Ground penetrating radar investigations across the Uemachi Fault, Osaka, Japan"Jour. Applied Geophysics. 1415. 1-13 (2003)

Rashed M.：“对日本大阪上町断层进行探地雷达调查”

Rashed M.: "Acquisition, processing and interpretation of shallow seismic reflection profile across Uemachi fault, along Yamato River, Osaka, Japan"Jour. Osaka City Univ.. 46. 193-206 (2003)

Rashed M.：“日本大阪大和河沿岸上町断层浅层地震反射剖面的采集、处理和解释”

Okudaira, T. et al.: "Sm-Nd and Rb-Sr dating of amphibolite from the Nellore-Khammar schist belt SE India"Geological Magazine. 138. 495-498 (2001)

Okudaira, T. 等人：“印度东南部 Nellore-Khammar 片岩带角闪岩的 Sm-Nd 和 Rb-Sr 测年”地质杂志。

Okudaira, T.: "Thermal evolution of the Ryoke Metamorphic belt, southwestern Japan : Tectonic and numerical modeling : Reply,"The Island Arc. 11. 146-148 (2002)

Okudaira, T.：“日本西南部 Ryoke 变质带的热演化：构造和数值模拟：回复”，岛弧。

Afnimar: "Joint inversion of refraction and gravity data for the three-dimensional topography of a sediment-basement interface"Geophys. J. Int.. 151. 243-254 (2002)

阿夫尼马尔：“沉积物-基底界面三维地形的折射和重力数据联合反演”地球物理学。