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Fan Xiaoping,Li Qinghe,He Haibing,Yang Congjie,Jin Shumei
Author NameAffiliation
Fan Xiaoping Earthquake Administration of Jiangsu Province,Nanjing 210014,China 
Li Qinghe Earthquake Administration of Jiangsu Province,Nanjing 210014,China 
He Haibing Earthquake Administration of Zhenjiang City,Zhenjiang 212001,China 
Yang Congjie Earthquake Administration of Jiangsu Province,Nanjing 210014,China 
Jin Shumei Earthquake Administration of Jiangsu Province,Nanjing 210014,China 
Characteristics of S-wave Envelope Broadening in the Changbaishan Tianchi Volcano
Fan Xiaoping1, Li Qinghe1, He Haibing2, Yang Congjie1, Jin Shumei1
1.Earthquake Administration of Jiangsu Province,Nanjing 210014,China;2.Earthquake Administration of Zhenjiang City,Zhenjiang 212001,China
High-frequency S-wave seismogram envelopes of microearthquakes broaden with increasing travel distance,a phenomenon known as S-wave envelope broadening. Multiple forward scattering and diffraction for the random inhomogeneities along the seismic ray path are the main causes of S-wave envelope broadening,so the phenomenon of S-wave envelope broadening is used to study the inhomogeneity of the medium. The peak delay time of an S-wave,which is defined as the time lag from the direct S-wave onset to the maximum amplitude arrival of its envelope,is accepted to quantify S-wave envelope broadening. 204 small earthquake records in Changbaishan Tianchi volcano were analyzed by the S-wave envelope broadening algorithm. The results show that S-wave envelope broadening in the Changbaishan Tianchi volcano is obvious,and that the peak delay time of S-wave has a positive correlation with the hypocenter distance and frequency of the S-wave. The relationships between the S-wave peak delay time and the hypocenter distance for different frequency bands were obtained using the statistics method. The results are beneficial to the understanding of the S-wave envelope broadening phenomena and the quantitative research on the inhomogeneities of the crust medium in the Changbaishan Tianchi volcano region.
Key words:  Changbaishan Tianchi volcano  S-wave envelope broadening  Peak delay time of S-waves