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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 FHD magnetometer vertical component minute value observation data, the anomalous spatial correlation of diurnal variation before the earthquake was analyzed. First of all, it analyzes the influence of the delay technique on eliminating the phase difference caused by the difference of day-to-day variations of the stations and finds that the delay technique can reduce the interference of the phase difference and expand the selection range of the reference station in longitude, which is considered as the minute value One of the advantages of digital geomagnetic data. At the same time, the effects of short-period components on the spatial variation of diurnal variation were analyzed. It is found that the periodic components that have a great influence on the spatial correlation of diurnal variation are about hourly, while the changes of shorter-period components have little effect on the spatial variation of diurnal variation.