Induced change of electric self-potential and magnetic field at the artificial explosion

被引：0

作者：

Sakai H. ^{[1
]}

Kobayashi T. ^{[1
]}

Izumi Y. ^{[2
]}

Nakayama T. ^{[2
]}

Hattori K. ^{[2
]}

机构：

[1] Department of Earth Sciences, University of Toyama, 3190 Gofuku, Toyama

[2] Disaster Prevention Research Institute, Kyoto University, Uji

来源：

IEEJ Transactions on Fundamentals and Materials | 2016年 / 136卷 / 05期

基金：

日本学术振兴会;

关键词：

Apparent resistivity; Electric self-potential; Explosion seismic experiment; Magnetic field;

D O I：

10.1541/ieejfms.136.291

中图分类号：

学科分类号：

摘要：

Study of the electric self-potential (SP) and the magnetic field was conducted at the explosion seismic experiment in Ooyama. Toyama Prefecture. The explosion was induced by 450 kg gun powder placed at a depth of 32.2-75 m. The SP was measured by four electrodes arranged in a line crossing the explosion point, where the distance of each electrode from the explosion ranged from 10 to 100 m. Induced SP changes consisted of two portions, namely, fluctuations with shorter periods (∼10 ms) and fluctuations with longer periods (-50 ms). Regarding the latter, the amplitude was in proportion to the span length of electrode couples and the fluctuations arrived faster at the electrode couples nearer to the explosion. Further, the increment of ground level in SP was observed in each electrode couple after the explosion, which was concordant with the distribution of apparent resistivity underground studied by the survey. The magnetic field measured by the fluxgate magnetometer at the site 35 m north from the explosion also showed change of a few nT after the explosion. This may have been caused by change of magnetic properties underground. © 2016 The Institute of Electrical Engineers of Japan.

引用

页码：291 / 296

页数：5

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