| 紫坪铺水库库区介质衰减、台站响应和震源参数研究 |
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| 引用本文： | 张永久,赵翠萍. 紫坪铺水库库区介质衰减、台站响应和震源参数研究[J]. 地震地质, 2009, 31(4): 664. DOI: 10.3969/j.issn.0253-4967.2009.04.010 |
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| 作者姓名： | 张永久 赵翠萍 |
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| 作者单位： | 1. 四川省地震局,成都,610041
2. 中国地震局地震预测研究所,北京,100036 |
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| 基金项目： | 国家科技支撑计划项目 |
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| 摘 要： | 利用紫坪铺水库数字地震台网和成都区域数字台网中的油榨坪台2004年8月到2008年5月12日汶川大地震前的紫坪铺库区2级以上地震波形资料,采用Atkinson方法计算了紫坪铺水库库区地震波非弹性衰减系数、几何扩散系数和介质品质因子;利用Moya等提出的方法计算了台站场地响应;对震源谱的低频水平和拐角频率进行了联合反演,并计算了紫坪铺库区287次1.6级以上地震的震源波谱参数,同时讨论了它们之间的关系。结果表明:紫坪铺库区Q值与频率的关系为Q(f)=47.8×f0.91;场地响应均表现为与频率相关;紫坪铺库区小震地震矩、震级与震源谱拐角频率的依赖关系不明确,这可能与水库诱发地震有关
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| 关 键 词： | 紫坪铺水库 非弹性衰减 场地响应 震源参数 |
STUDY OF ATTENUATION CHARACTERISTICS,SITE RESPONSE AND SEISMIC SOURCE PARAMETERS OF THE ZIPINGPU RESERVOIR REGION |
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| ZHANG Yong-jiu,ZHAO Cui-ping. STUDY OF ATTENUATION CHARACTERISTICS,SITE RESPONSE AND SEISMIC SOURCE PARAMETERS OF THE ZIPINGPU RESERVOIR REGION[J]. Seismology and Geology, 2009, 31(4): 664. DOI: 10.3969/j.issn.0253-4967.2009.04.010 |
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| Authors: | ZHANG Yong-jiu ZHAO Cui-ping |
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| Abstract: | Based on digital seismograms recorded by Zipingpu reservoir digital seismic network and YZP station of Chendu Digital Tele-seismic Network from August 2004 to May 2008 before the M8.0 Wenchuan earthquake,the paper calculates the inelastic attenuation,geometrical spreading and Q of the Zipingpu reservoir region using Atkinson's method,and site response using Moya's method.Seismic source parameters of 287 earthquakes with M≥1.6 were calculated and the relations between them discussed.Result shows:The relation between inelastic attenuation Q andfis Q(f)=47.8×f0.91;the site response has correlation with f;and the dependence between seismic moment,corner frequency and earthquake magnitude of small earthquakes is not obvious in the Zipingpu reservoir region,which maybe has something to do with reservoir-induced earthquake |
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| Keywords: | Zipingpu reservoir inelastic attenuation site response source parameter |
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