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，在日本东北部宫城县北部进行了甚低频至超低频频率范围内的大地电磁测量。结果表明，微震活动明显活跃在位于约10公里深度的电低阻块上方。1994年，位于日本九州南部的Kakuto火山口附近也进行了类似的大地电磁测深。1995年，我们对野岛断裂下的电阻率结构进行了研究，发现野岛断裂在1995年1月日本南部地震发生时，同时发生了移动。这次调查旨在长期监测断层的恢复过程。除了这些调查外，还利用电话公司的电缆在日本多个地区进行了Network-MT测量，以获得直到地壳底部的电阻率的基本结构。

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。”

村上英記: "ネットワークMT法データの圧縮法について" CA研究会論文集. 163-166 (1995)

Eiki Murakami：“论网络 MT 数据的压缩方法”CA Research Group Proceedings 163-166 (1995)。

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)。