SEISMOLOGY AND GEOLOGY ›› 2009, Vol. 31 ›› Issue (4): 664-675.DOI: 10.3969/j.issn.0253-4967.2009.04.010

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STUDY OF ATTENUATION CHARACTERISTICS,SITE RESPONSE AND SEISMIC SOURCE PARAMETERS OF THE ZIPINGPU RESERVOIR REGION

ZHANG Yong-jiu1, ZHAO Cui-ping2   

  1. 1. Earthquake Administration of Sichuan Province, Chengdu 610041, China;
    2. Institute of Earthquake Science,China Earthquake Adiministration, Beijing 100063, China
  • Received:2009-07-13 Revised:2009-10-21 Online:2009-12-24 Published:2010-04-17

紫坪铺水库库区介质衰减、台站响应和震源参数研究

张永久1, 赵翠萍2   

  1. 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
  • 作者简介:张永久,男,1970年出生,2003年毕业于中国科学技术大学固体地球物理专业,获理学硕士学位,副研究员,主要从事地震学及数字地震资料应用研究,电话:028-85481622,E-mail:ahangyongjiu@163.com.
  • 基金资助:
    国家科技支撑计划项目(2006BAC01B04,2008BAC38B030202)资助

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

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。

关键词: 紫坪铺水库, 非弹性衰减, 场地响应, 震源参数

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