Study on the characteristics and anomaly extraction methods of TJ-Ⅱ borehole body strain data at Liu'an Seismic Station,Anhui
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摘要: 本文对安徽市级台站六安台钻孔体应变进行了系统分析,通过对数据日常变化形态的分析,发现日变化能记录到明显的固体潮汐,但长周期数据处于“上升—开阀—上升”的数据特征;由于体应变漂移速率在缓慢改变,本文采用以月为窗长对体应变数据进行直线拟合,计算残差值,能有效消除体应变的漂移变化;通过Vendikov调和分析方法,采用以月为窗长的小时值进行潮汐计算,选取M2波振幅因子、相位滞后作为判断数据异常的依据,对本省发生的4.0级以上地震进行分析,地震前5个月未发现明显的异常。Abstract: This paper systematically analyzes the data of borehole strain at Liu'an Seismic Station, Anhui. By analyzing the daily variation of the data, it is found that the daily variations can record the significant solid tides. But the form of long - period data feature is the " linear ascending-sudden dropping-linear ascending”. Because the drift rate of bore-hole strain is changing slowly, this paper uses the month as the window length to fit the strain data by a straight line and calculate the residual. This method can effectively eliminate the drift of borehole strain. The tides are calculated with Vendikov harmonic method using an hour-long window. Using the amplitude factor and phase lag of M2 wave as the reference for the abnormal data, magnitude 4.0 earthquakes occurred in Anhui province is analyzed. The results showed no significant abnormalities during the five months before the earthquakes.
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