德令哈地震台测震干扰频谱特征及背景分析

The frequency spectrum characteristics of seismological interference at Delingha Seismic Station and its background analysis

通过3个台站地脉动频谱特征的对比,发现德令哈地震台地脉动记录6.5—7.5 Hz频段存在明显的高频干扰。根据2008年1月至2010年10月以来该高频干扰的频谱演化规律,对其产生背景来源做初步分析,在一定程度上解释了德令哈地震台P波记录个数减少的原因。

Broadband seismometer is so sensitive that a slight variation of the environment for seismological observation can influence the quality of digital records. First, by contrasting the frequency spectrum characteristics of microseisms records among three stations, it is discovered that there was high-frequency interference at the band of 6.5--7.5 Hz on the digital records of Delingha Seismic Station. Based on the evolution pattern of spectrum range from 6.5 to 7.5 Hz, original background and sources were preliminarily analyzed, which may account for the decreases of P wave records in Delingha Seismic Station to certain degree.