Thermal state observed by declination magnetometers on Aso volcano

阿苏火山赤纬磁力计观测到的热状态

• 批准号: 08640532
• 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 Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640532/
• 关键词: Aso volcano; Geomagnetic observation; Volcano-magnetic effect; Magnetometer; 火山性磁場変化; 地磁気偏角磁力計; 火山観測

A declination manetometer was developed with categories in sensitive and power saving. Two sets were installed near the active crater of Aso volcano, site C1 and W1, in March 1997. The purpose of this study is a detection of geomagnetic change associated with volcanic activity. We can estimate a thermal state beneath the crater through the magnetic change.Fluxgate magnetometer for declination was developed in 1996 FY.The stability is necessary to monitor the active volcano, Measurement of EY component of the geomagnetic field is the best. The device were buried in 2m depth to keep constant temperature. The specifications of the device ; sensitivity ; lOOnT/volt, resolution ; 1pT, stability ; 1nT/degree, power ; l2volts 12OmA.The volcanomagnetic change observed with proton magnetometer as follows ; the volcanic activity of Aso in 1997 was calm and kept cooling phase, but the phase was changed in heating on March 1998. The observed decrination data in this period gives us some new ivolcanomagnetic effects.

研制了一种具有灵敏度高、省电等特点的低压差计。1997年3月在阿索火山的活火山口附近安装了两套，地点C1和W1。这项研究的目的是探测与火山活动有关的地磁变化。1996年研制成功的磁通门地磁仪，其稳定性是监测活火山的必要条件，测量地磁场的EY分量是最好的。装置埋深2 m以保持恒温。仪器的性能指标：灵敏度：100 nT/V，分辨率：1 pT，稳定度：1 nT/度，功率：12 V/120 mA。质子磁力仪观测到的火山磁场变化如下：1997年阿索火山活动平静，一直处于降温阶段，1998年3月火山活动转为升温阶段。这一时期观测到的地磁变化资料，为我们提供了一些新的火山地磁效应。