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.

我们已经研究了从几个活性断层的农作物中收集的量规样品的物理特性，例如Atotsugawa F.，Yanagase F.，Gosukebashi F.和Nojima F.。该研究的目的是了解该研究在深区应力场下的仪表行为。我们进行了一些基本实验，例如晶粒尺寸分析，包括矿物质的晶格菌株分析，使用量规样品的地震波速度的测量和剪切强度等。在电子显微镜下发现，公共规材料的晶粒大小分布从10 rnm广泛到1mm。这意味着仪表在高约束压力下非常可压缩，并且在剪切变形下可能会扩张。膨胀性将有助于仪表通过在地震来源深度附近的应变来提高强度。使用X射线衍射分析测定了石英和伊利石矿物的晶格菌株的大小，并且发现与在不应激环境中形成的相同类型的矿物质相比，在其他手中，许多粘土材料与其他粘土材料相比，许多粘土材料都显示出与shear降低相关的粘土化材料。这种现象无法解释。该剪切诱导的极化（SIP）的机制被认为与接触细晶粒表面的吸收水层的物理化学特征有关。

项目成果

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。

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”

Afnimar, K.Koketsu, K.Nakagawa: "Joint inversion of refraction and gravity data for the three dimensional topography of a sediment-basement interface"Geophysical Journal International. 151. 243-254 (2002)

Afnimar、K.Koketsu、K.Nakakawa：“沉积物-基底界面三维地形的折射和重力数据联合反演”《国际地球物理杂志》。

中川康一, 根本達也, 升本真二, 駒沢正夫: "重点地盤調査候補地域"「地震防災のための深部地盤モデル」日本応用地質学会. 103-116 (2001)

中川浩一、根本龙也、增本真司、驹泽正男：“优先地面调查候选区域”“地震防灾深部模型”日本应用地质学会 103-116（2001）。