Thermal state observed by declination magnetometers on Aso volcano

研制了一种分灵敏和节电两大类的赤纬气压计。1997年3月，在阿苏火山活火山口附近安装了两套装置，分别是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。我们可以通过磁场的变化来估计陨石坑下的热状态。磁通门磁力计研制于1996年。稳定是监测活火山的必要条件，测量地磁场的EY分量是最好的。设备埋深2m，保持恒温。设备规格；敏感性;lot /volt，分辨率；1pT，稳定性；1nT/度，功率；l2volts 12 oma。质子磁强计观测到的火山地磁变化如下：1997年阿苏火山活动处于平静和降温阶段，1998年3月开始升温。这一时期观测到的降水资料给我们提供了一些新的火山地磁效应。

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.