紫坪铺水库库区震源波谱参数研究
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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日汶川大地震前的地震波形资料,采用遗传算法反演计算了紫坪铺库区261次1.6级以上地震的震源波谱参数。结果表明紫坪铺库区中小地震的地震矩Mo在1.35×1012～5.98×1014 N.m之间;应力降随着震级的增加而升高;库区小震震源谱拐角频率与地震矩、震级的依赖关系不明确,这可能与紫坪铺水库蓄水后库区压力增加,且水体沿着龙门山断裂方向扩散和渗透有关。
Based on digital seismograms recorded by Zipingpu reservoir digital seismic network and YZP station of Chengdu Digital Tele-seismic Network from August 2004 to May 2008 before Wenchuan MS8.0 earthquake,the seismic source parameters of 261 earthquakes above M 1.6 are calcalated.The result shows: seismic moments Mo were 1.35×1012~5.98×1014 N·m;the stess drop increased with earthquake magnitude;and the relationship of corner frequency relying on seismic moment and earthquake magnitude was not come into existence in Zipingpu reservoir area.This may have relation with augment of pressure,pervasion and infiltration of water along Longmenshan fault belt after reservoir sluice.
Based on digital seismograms recorded by Zipingpu reservoir digital seismic network and YZP station of Chengdu Digital Tele-seismic Network from August 2004 to May 2008 before Wenchuan MS8.0 earthquake,the seismic source parameters of 261 earthquakes above M 1.6 are calcalated.The result shows: seismic moments Mo were 1.35×1012~5.98×1014 N·m;the stess drop increased with earthquake magnitude;and the relationship of corner frequency relying on seismic moment and earthquake magnitude was not come into existence in Zipingpu reservoir area.This may have relation with augment of pressure,pervasion and infiltration of water along Longmenshan fault belt after reservoir sluice.
引文
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[16]李立平.谰沧-耿马地震震源动力学参数研究[J].地震研究,1990,13(3):223-232.
[17]刘学军,叶建庆,蔡绍平,等.姚安地震序列的震源参数研究[J].地震研究,2002,25(3):240-245.
[18]张永久,程万正.用S波研究雅江地震序列震源波谱[J].中国地震,2003,19(4):340-350.
[19]张永久,彭立国,程万正.马尔康地震序列震源参数研究[J].中国地震,2006,22(1):85-91.
[20]刘特培,康英.广东地区地震波谱和震源参数某些特征及与地震预报的关系[J].地震地磁观测与研究,2004,25(6):41-48.
[21]钱晓东,秦嘉政.澜沧江流域水电工程地区的环境剪应力及震源参数[J].地震研究,2005,28(1):64-70.
[22]雷建设,赵大鹏,苏金蓉,等.龙门山断裂带地壳精细结构与汶川地震发震机理[J].地球物理学报,2009,52(2):339-345.
[2]Moya A,Jorge A.Inverson of source parameters and siteeffects from strong ground motion record using genetic algo-rithms[J].Bull.Seism.Soc.Amer.,2000,90(4):977-992.
[3]Bindi D,Spallarossa D,Augliera P,et al..Source parametersestimated from the aflershock of the 1997Umbria Marche(Ita-ly)seismic sequence[J].Bull.Seis.Soc.Amer.,2001,91(3):448-455.
[4]刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,2003,25(2):211-218.
[5]郭晓,张元生,莘海亮,等.祁连山中东段地区非弹性衰减系数、震源参数和场地响应研究[J].西北地震学报,2007,29(4):319-325.
[6]朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].西北地震学报,2008,30(4):380-384.
[7]姚立王旬,钟羽云,张震峰,等.岩体裂隙充水后对拐角频率的影响[J].西北地震学报,2004,26(4):315-321.
[8]张永久,赵翠萍.紫萍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):664-674.
[9]胡先明,谢蓉华.紫坪铺水库地震台网记录地震的复杂性[J].四川地震,2006,(2):17-20.
[10]胡先明.紫坪铺水库蓄水前天然地震活动[J].四川地震,2007,(2):16-21.
[11]Waldhauser F,Ellsworth W L.A double diference earthquakelocation algorithm:Method an d application to the NorthernHaiward Fault,Califomia[J].Bull.Seism.Soc.Am.,2000,90(6):1353-1368.
[12]Chael,et al..Spectral scaling of earthquakes in the Mirami-chi region of New Brunswick[J].Bull.Seism.Soc.Am.,1987,77:347-365.
[13]Bakun W H.Seismic moments,local magnitudes,and coda-duration for earthquake in central Califonia[J].Bull.Seis.Sco.Am.,1984,74(2):439-458.
[14]李一正.滇西地区震级与地震矩标度[J].地震研究,1985,8(6):617-632.
[15]秦嘉政.用近震尾波估算昆明及其周围地区的Q值和地震矩[J].地球物理学报,1986,29(2):145-156.
[16]李立平.谰沧-耿马地震震源动力学参数研究[J].地震研究,1990,13(3):223-232.
[17]刘学军,叶建庆,蔡绍平,等.姚安地震序列的震源参数研究[J].地震研究,2002,25(3):240-245.
[18]张永久,程万正.用S波研究雅江地震序列震源波谱[J].中国地震,2003,19(4):340-350.
[19]张永久,彭立国,程万正.马尔康地震序列震源参数研究[J].中国地震,2006,22(1):85-91.
[20]刘特培,康英.广东地区地震波谱和震源参数某些特征及与地震预报的关系[J].地震地磁观测与研究,2004,25(6):41-48.
[21]钱晓东,秦嘉政.澜沧江流域水电工程地区的环境剪应力及震源参数[J].地震研究,2005,28(1):64-70.
[22]雷建设,赵大鹏,苏金蓉,等.龙门山断裂带地壳精细结构与汶川地震发震机理[J].地球物理学报,2009,52(2):339-345.
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