用小波分析提取重力固体潮
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摘要
地球固体潮观测对验证各种地球模型、研究地球内部构造具有重要意义,可为地震预报提供重要的参考依据。BBVS-120甚宽带地震计具有较低的自噪声水平,在低频端输出信号的频率很低,涵盖固体潮信息频带范围。本文提出:BBVS-120地震计输出信号中存在周日波、半日波和1/3日波的固体潮信号,利用小波分析,提取垂直分量中的重力固体潮信号,并作调和分析。
Earth solid tide is a cyclic deformation caused by attraction of Sun,Moon and other celestial bodies on the Earth.Earth solid tide observations have great significance in validating various earth models and studying the internal structure of the Earth.It can also provide an important reference for earthquake prediction.BBVS-120 very broadband seismometer has a lower noise level.Its output signal frequency is very low at the low frequency end,including tidal information frequency band.In this article,it is first proposed that there are diurnal tide,semidiurnal tide and 1/3 diurnal tide in output signal of BBVS-120 seismometer,and the method for extracting the gravity solid tide in the vertical signal from the seismometer with wavelet analysis and harmonic analysis.
Earth solid tide is a cyclic deformation caused by attraction of Sun,Moon and other celestial bodies on the Earth.Earth solid tide observations have great significance in validating various earth models and studying the internal structure of the Earth.It can also provide an important reference for earthquake prediction.BBVS-120 very broadband seismometer has a lower noise level.Its output signal frequency is very low at the low frequency end,including tidal information frequency band.In this article,it is first proposed that there are diurnal tide,semidiurnal tide and 1/3 diurnal tide in output signal of BBVS-120 seismometer,and the method for extracting the gravity solid tide in the vertical signal from the seismometer with wavelet analysis and harmonic analysis.
引文
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胡昌华,李国华,周涛.基于Matlab 7.X的系统分析与设计——小波分析(第三版)[M].西安电子科技大学出版社,2008:3-4.
廖盈春.小波变换在处理固体潮观测资料中的应用[D].华中科技大学,2007:10-13.
万永革.数字信号处理的Malab实现[M].北京:科学出版社,2007:294.
许厚泽,等.固体地球潮汐[M].武汉:湖北科学技术出版社,2010:81-107.
张雁滨,蒋骏,蔡亚先,吕永清,邵中明.武昌台JCZ-1地震计LP通道信号分析[J].大地测量与地球动力学,2006,26(4):112-115.