厦门台数字化潮汐资料的背景变化及其主要干扰因素

利用快速Fourier变换分析方法,对厦门台数字化潮汐资料的背景变化及其主要干扰因素进行了初步探讨,并对其存在的原因给出了可能的解释;和内陆台站的相应资料对比后表明,并非所有的台站测项所观测到的固体潮资料中,M2波都会占绝对优势;临海台站在作资料分析时,对M2波的分析应该是主要的,而内陆型台站应该综合考虑其它波群的影响;同一台站的不同测项受到主要干扰的机制是不同的,厦门台受海潮的干扰机制是,厦门台处于相干海潮波的波峰或波谷处,且该海潮波的周期又和M2波的非常接近,气压的干扰机制是,气压扰动形成的压力差以波动形式直接作用在洞体应变仪的含铌特种因瓦棒或传感器探头上,使得其记录曲线中叠加了多种波的成份。

The background variety of digital tide data and its main interference factor in Xiamen seisimic station

Using FFT analysis method, the background variety of the data tide data and its main interference factors in Xiamen seismic station are discussed simply ,and the possible explanation of their existing reasons are also given. After being compared to re responsible data of seismic station within continent, the results show that not all M2 wave will occupy absolute advantage in the solid tide material which be observed by seismic stations across the country, the analysis of M2 wave ought to be main target when studying the data of seismic stations near the sea, while affects of other wave groups should be considered in continental seismic stations, the interference mechanism is not same in different measurement of the same station. The interference mechanism of sea tide in Xiamen station is that Xiamen is located cresu or bottom of interference wave of sea tides ,and the period of sea tide is very closed to that of M2 wave. The interference mechanism of the air pressure is that the pressure difference formed by air pressure disturbance is acted directly on sensors of line-strain instrument by form of waves, making its recorded curve add more composition of waves.