Determinaion of the Direction of the Ground Noise Source

地面噪声源方向的确定

• 批准号: 61550470
• 负责人: OHMI Michito
• 金额: $ 0.9万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550470/
• 关键词: Micro-Tremor; Spectrum Analysis; スペクトル解析; 3次元回転スペクトル; 振動スペクトル; コヒーレンス; 卓越周波数; 回転スペクトル

It is well known that the micro-tremor is the three dimensional ground vibration induced by the various noise sources and the analysis of orbit of the vib ation in three dimensional space is important for discussing the characteristics and mechanism of the micro-tremor.In this project, a new technique for analyzing the orbit of the three dimensional vibration, namely three dimensional rotary spectrum, is presented and the applicability of it to the micro-tremor is discussed.Firstly, the theory of the three dimensional rotary spectrum is presented and experimental procedures and numerical scheme of it are described.secondly, field measurements of the micro-tremor were carried out at two sites, one is located in Yatsushiro plane and the other is located in the ground thermal region, and the characteristics of the miocro-tremor of each sites are analyzed by the proposed scheme. It is made clear that the micro-tremor can classified into two types of vibration, Rayleigh wave type and Love wave type, and the direction of the source which generate the tremor is determined from the analysis of the vibration plane.It is concluded that the three dimensional rotary spectrum has a promise to analyze the characteristics of the ground vibration of micro-tremor as well as the mechanism of it.

众所周知，地脉动是由各种噪声源引起的三维地面振动，三维空间中振动轨迹的分析对于探讨地脉动的特性和机理具有重要意义，本课题采用一种新的三维振动轨迹分析技术，即三维旋转谱，首先介绍了三维旋转谱的基本理论，给出了三维旋转谱的实验方法和数值计算格式，然后进行了两个场地的地脉动实测，一个位于八代平面，另一个位于地热区，并利用该方案分析了两个场地的微动特征。明确了地脉动可分为Rayleigh波型和Love波型两种振动类型，并从振面分析中确定了地脉动的震源方向，指出三维旋转谱法在分析地脉动的振动特性和机理方面具有广阔的应用前景。