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.

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.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