| S wave inelastic attenuation and site effect in the northern Tianshan area |
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| 作者姓名： | 姜慧 高孟潭 俞言祥 唐丽华 |
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| 作者单位： | [1]Earthquake Administration of Guangdong Province, Guangzhou 510070, China [2]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China [3]Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China |
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| 基金项目： | Foundation item： National Natural Science Foundation of China （50468003） and State 973 Project （2002 CB412706）. |
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| 摘 要： | In this paper,according to the relationship of observation spectrum with source spectrum,travel-path attenuationfactor and site effect,we use the digital seismic data of moderate-small earthquakes to invert the soft rock site ef-fect and S wave inelastic attenuation under the constraint of site effect,and determine the parameters of path andsite.The parameters obtained by this method exclude the topographic effect of seismic stations,and truly reflectthe seismic effect of free soft rock sites and the S wave inelastic attenuation in the studied region.The average softrock site effect is about 1.5 times in the frequency domain of 2～4 Hz and the S wave quality factor is obtained asQS=278 f0.346,which can be directly applied to the stochastic modeling of ground motions in the studied region.
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| 关 键 词： | 天山北部地区 S波品质因数 场址效应 非弹性衰减 |
| 文章编号： | 1000-9116（2007）02-0188-06 |
| 收稿时间： | 2006-08-11 |
| 修稿时间： | 2006-12-20 |
S wave inelastic attenuation and site effect in the northern Tianshan area |
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| Jiang Hui , Gao Meng-tan , Yu Yan-xiang and Tang Li-hua.S wave inelastic attenuation and site effect in the northern Tianshan area[J].Acta Seismologica Sinica(English Edition),2007,20(2):188-193. |
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| Authors: | Jiang Hui Gao Meng-tan Yu Yan-xiang and Tang Li-hua |
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| Institution: | (1) Earthquake Administration of Guangdong Province, Guangzhou, 510070, China;(2) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(3) Earthquake Administration of Xinjiang Uygur Autonomous Region, ürumqi, 830011, China |
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| Abstract: | In this paper, according to the relationship of observation spectrum with source spectrum, travel-path attenuation factor and site effect, we use the digital seismic data of moderate-small earthquakes to invert the soft rock site effect and S wave inelastic attenuation under the constraint of site effect, and determine the parameters of path and site. The parameters obtained by this method exclude the topographic effect of seismic stations, and truly reflect the seismic effect of free soft rock sites and the S wave inelastic attenuation in the studied region. The average soft rock site effect is about 1.5 times in the frequency domain of 2-4 Hz and the S wave quality factor is obtained as Qs=278f0.346, which can be directly applied to the stochastic modeling of ground motions in the studied region. |
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| Keywords: | S wave quality factor site effect inelastic attenuation northern Tianshan area |
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