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Investigation of the Characteristic Behaviors of the Crustal Block Boundary Deduced from Leakage Current Vectors

由漏电流矢量推导的地壳边界特征行为的研究

基本信息

批准号：
07804027
负责人：
WATANABE Kunihiko
金额：
$ 1.15万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07804027/
关键词：
leakage current self-potential difference active fault crustal block tectonic stress earthquake prediction

项目摘要

The object of this study is to investigate the characteristic behaviors of the crustal block boundary zone by analysing the leakage current vectors which are usually considered to be noises for self-potential analyzes. By comparing the waveformes of the leakage current observedat Ikeda station. apart from the street-car railway, with those at Hokuriku observation tunnel, near the railway, the geoelectric characteristics between those two stations can be estimated.Obtained results are as follows ;1)Observation have been carried out at two sites, Hokuriku observation tunnel (HKJ) and Ikeda station (TIJ). HKJ is closed to the railway and TIJ is on the Nukumi fault zone.2)Long-term variations were analyzed. At HKJ, areal variation of self-potential showed relatively high level in wet area and low in dry area. At TIJ, perpendicular components to the Nukumi fault strike have been almost stable and showed annual variations.3)Leakage current observation of 1 Hz sampling was carried out simultaneously at both HKJ and TIJ sites. Although the amplitudes of leakage current at TIJ were smaller than those of HKJ, those waveforms of both sites did not differ so much. By FFT analyzes of leakage current waveforms, remarkable differences in frequency components were not recognized in both sites.4)Some different types of leakage current were observed only by the components which are perpendicular to the fault strike at TIJ.This phenomenon might involve some suggestions about the fault structure.

本研究的目的是通过分析漏电流矢量来研究地壳块边界区域的特征行为，漏电流矢量通常被认为是自电势分析的噪声。通过比较池田站观测到的漏电流波形。除有轨电车铁路外，通过北陆展望隧道、铁路附近的地电特征，可以估算出两站之间的地电特性。得到的结果如下；1）在北陆展望隧道（HKJ）和池田站（TIJ）两个地点进行了观测。 HKJ靠近铁路，TIJ位于Nukumi断裂带上。2）分析了长期变化。在HKJ，自我潜力的区域变化在潮湿地区表现出相对较高的水平，而在干燥地区则较低。在TIJ，Nukumi断层走向的垂直分量几乎稳定，并呈现出年度变化。3）在HKJ和TIJ站点同时进行了1 Hz采样的泄漏电流观测。虽然TIJ处的漏电流幅值小于HKJ处的漏电流幅值，但两个部位的波形相差不大。通过对漏电流波形的FFT分析，在两个地点都没有发现频率分量的显着差异。4)仅在TIJ处垂直于断层走向的分量中观察到一些不同类型的漏电流。这种现象可能涉及对故障结构的一些建议。