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Study on the Piezomagnetism and Streaming Potential Based on the Local Geomagnetic and Geoelectric Variation Observed on the Shore of the Man-Made Lake Under the Seasonal Control of the Water Level

基于水位季节控制下人工湖岸边局部地磁地电变化的压磁和流势研究

基本信息

批准号：
01460051
负责人：
MIYAKOSHI J.
金额：
$ 3.2万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Continuous measurement of the geomagnetic and geoelectric field were carried out on the shore and its vicinity of the Sugesawa-dam Lake. Lake Nichinanko. which is located in the western part of Tottori Pref.Objectives of the measurement are (1) to detect the local geomagnetic field caused by the load of the lake water through the piezomagnetism and (2) to detect the local geoelectric field caused by the lake water pressure in the circumstance of the probable existence of the leakage of water from the bottom or surrounding of the lake through the streaming potential phenomenon.Continuous measurement started in the August of 1989 and we are now planning to continue until the end of 1991.After the continuous measurement of about one year on the shore of the lake. We found the local geomagnetic change is concordant with the change of the water level of the dam lake. Decrease of the geomagnetic total intensity occurs simultaneously with the increase of the water level.Piezomagnetic coefficient thus obtained are -0.014. -0.013 and -0.065 (nT/m) at DM1. DM2 and DM3. respectively. And they are concordant with the values obtained by Davis and Stacy (1972). Abudullabekov et al (1979) and Brennan and Hastie (1979).As for the relationship between the time variation of the geoelectric potential difference between electrodes and the change of the water level of the lake. the increase of the potential difference. EP (1-0) and EP (2-0) seems to have occured simultaneously with the increase of the water level of thlake. However, we cannot get conclusion at this moment because of the fairly long interruption of the observation in the year of 1990.In addition to these, we succeeded to observe a precursory change of the geoelectric potential differences EP (1-2) and EP (2-0) preceding the earthquake of M=5.3 which occured at about 4 kilometers distance from Nichinanko Lake.

在杉泽坝湖岸及其附近进行了地磁场和地电场的连续测量。Nichinanko湖。测量的目的是：(1)通过压磁法探测由湖水负荷引起的局部地磁场；(2)在可能存在湖水通过流势现象从湖底或湖周渗漏的情况下，探测由湖水压力引起的局部地电场。连续测量开始于1989年8月，我们现在计划持续到1991年年底。经过一年左右在湖岸的连续测量。局部地磁变化与堰塞湖水位变化具有较好的一致性。地磁总强度的减小与水位的升高同时发生。由此得到的压磁系数为-0.014。-0.013和-0.065 （nT/m）。DM2和DM3。分别。这与Davis和Stacy（1972）得出的价值观是一致的。Abudullabekov et al（1979）和Brennan and Hastie（1979）。电极间地电位差的时间变化与湖面水位变化的关系。电位差的增加。EP（1-0）和EP（2-0）似乎是随着湖泊水位的升高而同时发生的。然而，由于1990年的观测中断时间较长，我们目前无法得出结论。此外，在距日南湖约4公里的M=5.3级地震发生前，成功观测到地电位差EP（1-2）和EP（2-0）的前兆变化。