The Electrical Structure of Volcano Aso.

阿苏火山的电力结构。

• 批准号: 61540290
• 负责人: TANAKA Yoshikazu
• 金额: $ 1.22万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61540290/
• 关键词: ELF; VLF; ASO Volcano; Resistivity; VLF; MT法; 海の電磁誘導; 電気比抵抗; ULF電磁波; マグマ溜り; 観測; 電気構造; MT観測

Scince 1986, the study of the electric soundings of ASO Volcano have been conducted by use of Schulumberger vertical sounding, VLF-MT, ELF-MT and 3 component geomagnetic MT observations. Observing instruments were developed.1) High-density data acquisition system, using normal Audio casset tape, was improved for Geomagnetic Deep Sounding (10sec sampling). 2) 10.2KHz OMEGA VLF MT receivers and 3) Portable ELF-MT equipment were produced. Observed results descrived below. 4) 3 Dimensional maps of the electrical resistivities of the ASO Caldera were created using the VLF, ELF MT data obtained 202 observing points. 5) The 25 sites GDS discovered the large scale electrical structures of central KYUSYU. 6) The electric structures of ASO caldera were classified into low resistive zone (less 50 ohm-m), high resistive zone (greater 500 ohm-m) and middle zone. 7) The extremely low resistive zone characterized hot spring areas and active volcanic crater. 8) Whereas induction vector (T>1000sec) point out South-West direction at central or northern part of KYUSYU, model calculations shows SSW. This discrepancy were caused by existence of high conductive materials beneath the North-East part of East China Sea.

Scince 1986年，通过使用Schulumberger垂直声音，VLF-MT，Elf-MT和3个组件地磁MT观测来对ASO火山的电气进行研究。 1）使用普通音频盒式胶带进行了高密度数据采集系统，以改进地磁深度响应（10秒采样）。 2）10.2kHz Omega VLF MT接收器和3）生产便携式ELF-MT设备。观察到的结果在下面描述。 4）使用VLF，ELF MT数据创建了202个观测点的ASO Caldera电阻率的3个维图。 5）25个地点GDS发现了中央Kyusyu的大规模电结构。 6）将ASO火山口的电结构分为低电阻区（较少50欧姆），高电阻区（大于500 ohm-m）和中部区域。 7）极低的电阻区域表征了温泉区域和活跃的火山口。 8）虽然感应载体（t> 1000秒）指出了Kyusyu中部或北部的西南方向，但模型计算显示SSW。这种差异是由于东部中国东北部下方存在高导电材料而引起的。

项目成果

Yoshikazu TANAKA,;HANDA,S.;Suzuki A.: Kagoshima International Conference on Volcanoes 1988. 335-338 (1988)

Yoshikazu TANAKA,;HANDA,S.;Suzuki A.: 鹿儿岛国际火山会议 1988. 335-338 (1988)

半田駿・田中良和・鈴木亮: Conductivity Anomaly研究会1988年論文集. 81-96 (1988)

Shun Handa、Yoshikazu Tanaka、Ryo Suzuki：电导率异常研究组会议记录 1988。81-96 (1988)