红山地震台磁通门磁力仪GM4参考背景噪声分析

The analysis of reference background noise of fluxgate magnetometer GM4 at Hongshan Seismic Station

选取红山地震台2009—2013年磁通门磁力仪GM4-1和GM4-2的参考背景噪声数据进行分析。结果显示:两套仪器背景噪声年变化趋势一致,其中D分量背景噪声随季节变化明显,H分量、Z分量不明显。另外,GM4-2仪各分量背景噪声值较高,认为是其自身原因引起的。

This article analyzes preliminarily the data of reference background noise, which is chosen from GM4-1 fluxgate magnetometer instrument and GM4-2 fluxgate magnetometer instrument during the year of 2009 to 2013 at Hongshan Seismic Station. The result shows that the reference background noise of two instruments annual variation trend is consistent, and magnetic declination component changes with the seasons obviously, horizontal component and vertical component is not obvious. In addition, the background noise GM4-2 fluxgate magnetometer′s each component is more than that of GM4-1 fluxgate magnetometer instrument, which is caused by itself through the analysis by comparison.