Observational study of electrical potential change in vicinity to micro earthquakes using high-sensitive antenna

利用高灵敏天线观测微震周边电位变化

• 批准号: 22340122
• 负责人: YOSHIDA Shingo
• 金额: $ 10.07万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340122/
• 关键词: 自然現象観測・予測; 地震現象; 電磁場変動; 微小地震; 固体地球物理学; 地震

In order to measure electric potential change associated with mining induced seismic events, we developed high-sensitive borehole antennas and installed them in a deep gold mine in South Africa in 2010. In addition, we installed borehole magnetometers which were newly developed in 2012. We evaluated the amplitude of electric potential change as a function of earthquake magnitude and source distance assuming rock contains randomly oriented quartz. Electromagnetic field changes were frequently observed when the seismic wave arrived. We discussed the waveformscomparing seismograms.

为了衡量与采矿引起的地震事件相关的电势变化，我们开发了高敏感的钻孔天线，并于2010年将它们安装在南非的深金矿中。此外，我们安装了2012年新开发的钻孔磁力计。假设岩石包含随机定向的石英，评估了电势变化的幅度，而源距离的函数和源距离的函数。当地震波到达时，经常观察到电磁场变化。我们讨论了波形综合的地震图。

项目成果

Detection of mining-induced fractures around a stope in Ezulwini gold mine, South Africa, by using AE events with similar waveforms

利用具有相似波形的 AE 事件检测南非埃祖尔韦尼金矿采场周围采矿引起的裂缝

• 发表时间: 2012
• 期刊: Proc. 21th Int. Acoustic Emission Sym., Jap. Soc. for Non-Destructive Inspection
• 作者: Moriya;H.;M. Naoi;M. Nakatani;O. Murakami;T. Kgarume;A.K. Ward;R. Durrheim;J. Philipp;Y. Yabe;H. Kawakata;and H. Ogasawara
• 通讯作者: and H. Ogasawara

微小地震に伴う電位変動観測

与微地震相关的潜在波动的观测

• 发表时间: 2011
• 作者: 吉田真吾;中谷正生;直井誠
• 通讯作者: 直井誠