用钻孔体应变资料检测地球球型振荡的数据处理方法

The data processing method of extracting the earth's spheroidal oscillations from the data of borehole dilatometer

利用宽城台TJ式体应变资料,用三种不同的数据处理方法对苏门答腊地震的观测应变数据进行去固体潮和滤波消噪处理,检测到地球球型振荡,并识别出球型振荡0S3～0S26基频振型。然后与另一种没经过去固体潮和滤波消噪的方法识别的球型振荡进行对比,发现用这四种不同方法得到的球型振荡的每一振型的周期完全相等,振幅的差别比较小,反映了宽城台钻孔体应变仪的观测资料受固体潮和噪声的影响比较小。

Using the data from the Sumatra-Andaman Earthquake recorded by the borehole dilatometer at Kuancheng station,we used three data processing methods for removing solid tide and denoising by filtering,and one method which does not remove solid tide and filter wave,then we identify 0S3~0S16 modes.We find that the periods of every mode from 4 methods are completely equal and the amplitudes are nearly equal,which reflects that the influence of solid tide and noise to Kuancheng station’s borehole dilatometer is small.