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《Science of Surveying and Mapping》 2012-06
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Detecting the triplet of Slichter mode based on HHT technique

SHEN Wen-bin,QIU Peng,LI Jiang-tao,SHENG Min-han,ZHANG Xiao,LI Sai-hong(School of Geodesy and Geomatics,Wuhan University,China 430079,Wuhan)  
Observations of the Slichter mode triplet have effective constraint on the density and radius of the inner core,as well as the density jump at the inner core boundary.Smylie(1992)declared that the triplet of the Slichter mode was detected,but his results have not yet been accepted by most scientists.In this paper,the authors elaborated the core idea of the Hilbert-Huang Transform(HHT)technique via an experimental example analysis,and then used this analysis technique to detect the Slichter mode triplet.They chose continuous two-years long one-hour-interval superconducting gravity(SG)data recorded at eight stations distributed globally,and superimposed them after tide and pressure correction to obtain the gravity residual.Then,they applied the HHT analysis technique to the gravity residual series to obtain the energy spectrum,from which they found 12 combinations of the triplet spectral peaks as possible candidates of the Slichter mode triplet.Especially,two triplets of them were very close to Smylie's result.It was noted that,comparing with Smylie's result,the results have more symmetrical spectral splitting pattern.
【Fund】: 国家自然科学基金(41174011;40974015) 国家自然科学基金创新群体(41021061)
【CateGory Index】: P223
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