| Distribution of Lg coda Q in Xinjiang and its adjacent regions |
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| 作者姓名： | 徐彦 毛燕 胡家富 苏有锦 丛连理 |
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| 作者单位： | Department of Geophysics，Yunnan University，Kunming 650091，China，Earthquake Administration of Yunnan Province，Kunming 650041，China，Department of Geophysics，Yunnan University，Kunming 650091，China，Department of Geophysics，Yunnan University，Kunming 650091，China，Earthquake Administration of Yunnan Province，Kunming 650041，China，Department of Geophysics，Yunnan University，Kunming 650091，China |
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| 基金项目： | National Natural Science Foundation of China (49974012) and Joint Seismological Science Foundation of China (604004). |
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| 摘 要： | Introduction Lg wave is usually considered as one of the most prominent phases recorded by short-period or broadband seismometers in the continental area. Therefore, it is often used to determine the magnitude of regional earthquakes, the yield of nuclear explosions (Nuttli, 1986) and the horizon-tal variations of crustal attenuation. A theoretical ray approach shows that Lg is the superposition of higher-mode surface waves propagating in the continental crust (Knopoff et al, 1973; Panza and…
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Distribution of Lg coda Q in Xinjiang and its adjacent regions |
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| XU Yan,MAO Yan,HU Jia-fu,SU You-jin,CONG Lian-li.Distribution of Lg coda Q in Xinjiang and its adjacent regions[J].Acta Seismologica Sinica(English Edition),2005,18(2). |
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| Authors: | XU Yan MAO Yan HU Jia-fu SU You-jin CONG Lian-li |
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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 Q0 (Q at 1 Hz) and the frequency correlation factor ηcorresponding to each path. Based on the results, the distribution images of Q0 and ηin 1°×1° grids for Xinjiang region were gained by the back-projection technique. The results indicate that Q0 is high (300～450) in the Tarim platform and marginal Siberian platform, while Q0 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, Q0 is also low (250～300) and ηvaries between 0.5 and 0.9. |
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| Keywords: | Lg coda Q stacked spectral ratio method back-projection technique Xinjiang region |
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