Rayleigh Wave Tomography of the Phase Velocity in North China

详细信息   

• 责任者：Pan Jiatie (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Wu Qingju
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(1)
• 关键词：瑞雷波 ; Rayleigh waves ; 速度结构 ; velocity structure ; 华北地台 ; North China Platform
• 页码：p.67-76
• 图表：8 illus., 41 refs.
• 分类号：0400
• 出版序号：20120063
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

Using the teleseismic data recorded by 190 broadband stations and 8 very broadband stations of the portable seismic array in North China during Oct. 2006 to May. 2009, short period (10～60 s) inter-station phase dispersions of fundamental Rayleigh waves are obtained by the method of frequency and time analysis of wavelet transformation. Compared with the phase velocity maps of short periods, the lateral heterogeneity of phase velocity becomes much weaker in the long period (60 s) maps. Compared with that in typical craton, the phase velocity of NCC is much slower at periods of 10～60 s, whose dispersion characteristic is very similar with that in the typical rift regions of the world (e.g. Rio Grande Rift). It indicates the NCC has been obviously eroded and breached.