Distribution of Lg coda <Emphasis Type="Italic">Q</Emphasis> in Xinjiang and its adjacent regions |
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Authors: | Xu Yan Mao Yan Hu Jia-fu Su You-jin Cong Lian-li |
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Institution: | 1.Department of Geophysics,Yunnan University,Kunming,China;2.Earthquake Administration of Yunnan Province,Kunming,China |
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Abstract: | In this study, we collected 1 156 broadband vertical components records at 22 digital seismic stations in Xinjiang region, Ürümqi station, and 7 stations in the adjacent regions during the period of 1999–2003. The records were firstly processed by the stacked spectral ratio method to obtain Q 0 (Q at 1 Hz) and the frequency correlation factor η corresponding to each path. Based on the results, the distribution images of Q 0 and η in 1°×1° grids for Xinjiang region were gained by the back-projection technique. The results indicate that Q 0 is high (300–450) in the Tarim platform and marginal Siberian platform, while Q 0 is low (150–250) in the southern regions as west Kunlun fold system and Songpan-Ganzi fold system. In the northern regions as Junggar fold system and Tianshan fold system, Q 0 is also low (250–300) and η varies between 0.5 and 0.9. |
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