The S-Wave Velocity Structure in the Crust and Upper Mantle as well as the Tectonic Setting of Strong Earthquake beneath Yunnan Region

详细信息   

• 责任者：Zhang Xiaoman (Department of Geophysics ; Yunnan University ; Kunming 650091 ; China) ; Hu Jiafu
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(5)
• 关键词：地壳 ; crust ; 上地幔 ; upper mantle ; 速度结构 ; velocity structure ; 孕震构造 ; seismogenic tectonics ; 云南 ; Yunnan Province
• 页码：p.1222-1232
• 图表：8 illus., 1 table, 34 refs.
• 分类号：0500
• 出版序号：779
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

The technique of phase-matched filter is applied to extract the fundamental Rayleigh surface waves from 47 seismic events recorded by 65 digital seismic stations, which are deployed in Yunnan Province and its adjacent region. The authors extract the phase velocity dispersion within 152 pairs of stations from 2 000 waveforms, and then invert it for the S-wave velocity structure in a depth of 0~200 km. The result shows that the overall variation of the crust thickness beneath Yunnan Province has a south-north trend, increasing gradually from 30 km in the south to 60 km in the north. The Moho shows uplift and depression locally, and is basically featured with one uplift and two depressions. Additionally, the lithosphere structures are significantly different across the Red River fault in the western Yunnan Province.