| Distribution of L_g coda Q in the Chinese continent and its adjacent regions |
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| 作者姓名： | 丛连理 胡家富 傅竹武 温一波 康国发 吴小平 |
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| 作者单位： | Department of Earth Sciences of Yunnan University, Kunming 650091, China |
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| 基金项目： | This study is supported by the National Natural Science Foundation of China (Grant No. 49974012) and the Natural Science Foundation of Yunnan Province (Grant No. 98D003R). |
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| 摘 要： | In continent Lg is usually one of the predominant phases recorded by short-period or broad-band seismometers. A ray-theoretical approach shows that Lg wave is the superposition of higher-mode surface waves propagating in the continental crust1—4]. The g…
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Distribution of Lg coda Q in the Chinese continent and its adjacent regions |
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| Abstract: | traces of vertical components from shallow earthquakes recorded by 10 CDSN (Chinese Digital Seismographic Network) stations and 5 GSN (Global Seismographic Network) stations were collected to study the attenuation characteristics of Lg coda in the Chinese continent and its adjacent regions. The records were processed first using the stack spectral ratio method to obtain the average values of Q0 (Q at 1Hz) and h, the frequency dependence, of Lg coda in the ellipses corresponding to the paths. The back-projection technique was then employed to obtain the tomographic maps of Q0 and h values, and the distribution of their errors. Results indicate that in the studied area Q0 varies between 200 and 500. The lowest value of Q0 exists in the Yun-nan-Tibetan region, while the highest value of Q0 occurs in the southern edge of Siberian platform. h varies between 0.3 and 0.8. For most part of the studied area h varies inversely with Q0. |
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| Keywords: | Chinese continent Lg coda Q stack spectral ratio method back-projection technique |
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