3D conductive structures and crustal activities beneath Japan islands

日本列岛下方的 3D 导电结构和地壳活动

• 批准号: 05302022
• 负责人: SUMITOMO Norihiko
• 金额: $ 10.94万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05302022/
• 关键词: Magnetotelluric; Microseismicity; Resistivity; Fault; ULF-MT; ELF-MT; 電気伝導度構造; 電気抵抗; 地震活動; MT法; 地殻; 活断層; 微小地震; CA; 電気抵抗構造; 誘導電流

In 1993, magnetotelluric surveys in the frequency range from VLF to ULF were carried out in the northern part of Miyagi prefecture, north-east Japan. The result showed that microseismicity is clearly active in the zone just above an electrically low resistive block located at the depth of about 10km.In 1994, similar MT surveys were carried out around Kakuto caldera situated in the southern part of Kyushu district, Japan. It was concluded that Ebino earthquake swarms likely occurred within the electrically resistive zone.In 1995, we examined the electrical resistivity structure beneath Nojima fault which was recognized to be moved at the same time when Hyougoken-Nanbu earthquake occurred in January, 1995. This investigation is aimed to monitor the recovery process of the fault for a long time.In addition to these investigations, Network-MT measurements utilizing the telephone company cables were conducted in a number of districts in Japan to obtain the basic structure of electric resistivity until the bottom of the earth crust.

1993年，在日本东北部的宫城县北部进行了从VLF到ULF的频率范围的磁铁调查。结果表明，微作用性在1994年约10公里的电阻块上方的区域中显然是活跃的，在1994年的大约10公里处，在位于日本京胡岛南部的Kakuto Caldera附近进行了类似的MT调查。结论得出的结论是，埃比诺地震群可能发生在电阻区域内。1995年，我们检查了Nojima断层下方的电阻率结构，该结构在1995年1月发生的Hyougoken-Nanbu地震时被认为是在同一时间移动的。这项研究。这项研究。旨在长时间监测故障的恢复过程。除了这些调查外，在日本的许多地区进行了使用电话公司电缆进行网络MT测量，以获得电阻率的基本结构，直到底部地壳。

项目成果

Mishina, M: "Amplitude variation of leakage current noises from electric railways which are included in the Network-MT data." Proc.of Conductivity Anomaly Symposium. 59-64 (1995)

Mishina, M：“网络 MT 数据中包含的电气化铁路泄漏电流噪声的幅度变化。”

三品正明: "ネットワークMTデータに含まれる電車漏洩電流ノイズの振幅変化について" CA研究会論文集. 59-60 (1995)

Masaaki Mishina：“关于网络 MT 数据中包含的列车漏电流噪声的幅度变化”CA Research Group Proceedings 5​​9-60 (1995)。

Yamomoto, T: "Use of remote reference method and its limit." Proc.of Conductivity Anomaly Symposium. 174-183 (1995)

Yamomoto, T：“远程参考方法的使用及其限制。”

三品正明: "ネットワークMTデータに含まれる電車漏洩電流ノイズの振幅変化について" CA研究会論文集. 59-64 (1995)

Masaaki Mishina：“关于网络 MT 数据中包含的列车漏电流噪声的幅度变化”CA Research Group Proceedings 5​​9-64 (1995)。

田中良和: "雲仙山頂部における地磁気3成分観測" CA研究会論文集. 121-126 (1995)

Yoshikazu Tanaka：“云仙山顶的三个地磁成分的观测”CA Research Group Proceedings 121-126（1995）。