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紫坪铺水库库区介质衰减、台站响应和震源参数研究
STUDY OF ATTENUATION CHARACTERISTICS,SITE RESPONSE AND SEISMIC SOURCE PARAMETERS OF THE ZIPINGPU RESERVOIR REGION
【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。
【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.
【Key words】 Zipingpu reservoir; inelastic attenuation; site response; source parameter;
- 【文献出处】 地震地质 ,Seismology and Geology , 编辑部邮箱 ,2009年04期
- 【分类号】P315.2
- 【被引频次】15
- 【下载频次】105