会昌地震台相同测点倾斜固体潮观测之对比分析

通过对会昌地震台2007-07～2011-06相同测点倾斜固体潮资料的对比分析,可以看出垂直摆资料质量稍优于水管仪资料,两种资料存在着一定的可比性。其主要的相同之处表现在于年变趋势动态、日变形态和降雨、强远震波动、潮汐因子的时间同步性上;而NS向线性倾变、潮汐因子定量化和高频信号频谱等方面存在一定差异。这种差异主要可能为观测山洞的环境条件和仪器工作特性的不同。为改善地倾斜资料高频信息记录能力,建议提高仪器采样率和改进仪器频率响应设计。

Contrastive Analysis on the Earth’s Tidal Tilt from the Same Observation Point in Huichang Seismic Station

Through contrastive analysis on the Earth’s tidal tilt data from Jul.2007 to Jun.2011 between DSQ water pipe and VS Vertical pendulum tiltometers in Huichang Seismic Station,the paper concludes that the quality of the vertical pendulum data is slightly superior to that of the water pipe data,in view of certain comparability between the two.The two said data are similar in the annual variation trend,daily variation form,as well as the time synchronization of the rainfall,wave motion of strong and distant earthquakes and the tidal factors,but are different in terms of NS-oriented linear tilt change,quantification of tidal factors and frequency spectrum of high frequency signals.These differences are probably caused mainly by different environmental conditions of the observation cave and performance characteristics of the instruments.As a result,it is suggested to improve the sampling rate and frequency response design of the observation instruments,so as to improve our capability to record high frequency information for the ground tilt data.