%0 Journal Article %T A STUDY OF LG CODA ATTENUATION BENEATH NORTH CHINA: SEISMIC IMAGING OF LG CODA Q0
华北地区Lg尾波衰减研究——Lg尾波Q0地震成像 %A LIU Jian-Hua LIU Fu-Tian YAN Xiao-Wei XU Yi HAO Tian-Yao Institute of Geology %A Geophysics %A Chinese Academy of Sciences %A Beijing %A China %A
刘建华 %J 地球物理学报 %D 2004 %I %X By using 560 Lg coda Q 0 values measured on propagating paths, the Q 0 image in the crust beneath the North China region is restructured with a stochastic modeling and the singular value decomposition. The result indicates that there is remarkable lateral heterogeneity on Lg coda Q 0 distribution in the crust beneath the North China region, similar to the velocity image, and closely related with the known surface geological features: the low Q 0 areas exist beneath the Taihang and Yanshan mountains and the Luxi uplift area, and high Q 0 values appear below the Jizhong, Huanghua and Jiyang depressions and the plain areas. There is a clear division between the high and low Q 0 values. Compared with the heat flow values in North China, most the low Q 0 value areas are located in the high heat flow areas. It is possibly related with hot material activity in the crust below these areas. Although there is a clear difference between the high and low Q 0 value areas in the crust of North China, as a whole the North China belongs in low Q 0 value abnormal region. It means that the region is a high seismic wave attenuation area. Probably it is resulted from the interaction between Eurasia and Pacific plates, which causes the crust thinning and hot material upwelling. %K North China %K Lg coda %K Lg coda Q %K 0 %K Image of the seismic wave attenuation %K Lateral heterogeneity
华北地区 %K Lg尾波 %K Lg尾波Q0 %K 地震波衰减成像 %K 横向不均匀性 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=5DF01F622B5D6A44&yid=D0E58B75BFD8E51C&vid=F4B561950EE1D31A&iid=B31275AF3241DB2D&sid=3F10405738B4D004&eid=33C2C2DAF31F219B&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=12&reference_num=25