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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。
By using the data of TJ strain of Kuancheng station, the observed strain data of Sumatra earthquake were removed by solid tide and filtered by three different data processing methods, the global spherical oscillation was detected and the spherical oscillation was identified as 0S3 ~ 0S26 fundamental frequency mode. And then compared with another spherical oscillation identified by the method of removing solid tide and filtering noise. It is found that the periodicity of each mode of spherical oscillation obtained by the four different methods is exactly the same, and the difference of amplitudes is compared Small, reflecting the Kuancheng station borehole strain gauge observations by the impact of solid tide and noise is relatively small.