Distribution of Lg coda Q in Xinjiang and its adjacent regions |
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| Authors: | Xu Yan Mao Yan Hu Jia-fu Su You-jin and Cong Lian-li |
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| Institution: | (1) Department of Geophysics, Yunnan University, 650091 Kunming, China;(2) Earthquake Administration of Yunnan Province, 650041 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.
Foundation item: National Natural Science Foundation of China (49974012) and Joint Seismological Science Foundation of China (604004). |
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| Keywords: | Lg coda Q stacked spectral ratio method back-projection technique Xinjiang region |
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