论文部分内容阅读
We have collected 432 vertical component records from 45 stations of new CENC (China Earthquake Network Center) in Chinese mainland and adjacent regions. These records were used to calculate Q0 (Q at 1Hz) and ηvalues of Lg coda from each station by the stack spectral ratio (SSR) method. Then the tomography method was applied to obtaining lateral variation of Q0 and ηvalues in Chinese mainland and adjacent regions. The result indicates that Q0 value varies between 150 and 600 in the studied areas. Yunnan, southwest Sichuan, and northwest Myanmar show the lowest Q0 value (Q0＜240) and the crust of these regions is characterized by complicated crack and strong hydrothermal activity. The highest Q0 value (Q0＞510) exists in the border of southern Mongolia, Alxa and Ordos block. The ηvalue varies between 0.45 and 0.75 in Chinese mainland and its adjacent regions.