FHD磁力仪Z分量分钟值日变化空间相关性的初步应用

Preliminary application of the daily-variation spatial correlation method of vertical component's minutely value of FHD Magnetometer

应用FHD磁力仪垂直分量分钟值观测资料,初步分析了地震之前的日变空间相关性异常。首先分析了延时技术消除台站经度不一致造成的日变化相位差异对相关运算的影响,发现延时技术可降低相位差异的干扰,拓展参考台在经度方面的选择范围,并认为这是分钟值数字地磁资料优势之一。同时分析了短周期成份对日变化空间相关性的影响,发现对日变化空间相关性影响较大的周期成份在小时级左右,而更短周期成份的变化对日变化空间相关性影响不大。

By using the data of FHD vector proton precession magnetometer in the 1.0 min. sampling rate, we preliminary analyzed the anomalies of daily-variation spatial correlation before an earthquake occurred in this paper. Firstly, we reduced the influence of the phase difference of daily variation on the correlation caused by the disagreement of the longitude of the observatories by using delay technique, and found that the delay technique can extend the selecting range of the longitude of the reference observatories, which is considered one of the advantages the digital geomagnetic data of minutely value have. We also analyzed the influence of the short-period changes on the spatial correlation of daily variation and found that the influence of the hour-period on the spatial correlation is larger than the shorter period.