Heterogeneous electrical structure of Kozu-shima volcanic island, Japan.
Heterogeneous electrical structure of Kozu-shima volcanic island, Japan.
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DOI：
10.2183/pjab.85.476
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Uyeda S
中科院分区：
文献类型：
--
作者：
Orihara Y;Kamogawa M;Nagao T;Uyeda S
1997年至2000年，日本神津岛地震前观测到了近20次地电场异常变化。为了帮助定位当前观测到的异常变化的来源，进行了双极-偶极电阻率调查。通过电阻率测量，包括向地下注入电流，发现异常变化的各种特征与人工源和地磁扰动感应引起的变化有系统的不同。而且，人们怀疑异常变化的电流不是在地表附近产生的，而是在地下深处产生的。
Nearly twenty anomalous geoelectric field changes were observed before earthquakes at Kozu-shima Island, Japan, from 1997 to 2000. In order to help locating the current sources of the observed anomalous changes, a bipole-dipole resistivity survey was conducted. From the resistivity survey, including current injection into the ground, it was found that various features of the anomalous changes were systematically different from those of changes caused by artificial sources and induction of geomagnetic disturbances. Moreover, it is suspected that the currents of anomalous changes were generated not near the ground surface but deep under the ground.