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Characteristics of s-wave envelope broadening in the Changbaishan Tianchi Volcano

Earthquake Research in China 2010年第3期24卷 385-393页

作者： Fan Xiaoping Li Qinghe He Haibing Yang Congjie Jin shumei Earthquake Administration of Jiangsu Province Nanjing 210014 China 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.

关键词： Changbaishan Tianchi volcano s-wave envelope broadening Peak delay timeof s-waves

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