基于sato模型的山西北部地区尾波Q值研究
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摘要
依据sato单次散射模型,对山西北部(北纬380～410)2001年至2011年13个数字遥测子台记录的地震波形资料进行计算和分析。拟合尾波窗长40 s时尾波Q值对频率的依赖关系,得到山西北部地区Q值随频率的变化关系式。其中,阳原台Q0值最高,大同台Q0值最低。研究区多数台站都表现为低Q0值,高η值,符合Q值与频率的依赖关系,表明该地区地下介质非均匀程度高,构造活动强烈;另外,研究区大同台、右玉台和偏关台相对于本次研究的其他台站为低Q0值区,这一区域正好位于我省西北部NNE走向的口泉活动断裂处,中间以盆地为分割,与恒山、六棱山断裂分开,表明研究结果与研究区活动断裂和沉积厚度有一定的关系。
Using Sato single scatter model,seismic waveform data recorded by 13 digital stations in north of Shanxi from 2001 to 2011 are calculated and analyzed.Correlation of Q value of coda wave to frequency is fitted for the coda wave window of 40s and variation of Q value with frequency in north of Shanxi is figured out.The highest Q0 value,which is up to 31.82,is at Yangyuan Station,whereas the lowest,31.82,is at Datong Station.That most stations in studied region show low Q0 value and high η value,which coincide with correlation of Q value and frequency,illustrates that non-uniform degree of underground medium is high and that tectonic activity is intensive in the region.In addition,compared with other stations with low Q0 value,Datong,Youyu and Pianguan stations that show low Q0 value just locate at Kouquan fault of NNE direction in northwest of Shanxi province,being detached with Hengshan and Liulengshan fault by the basin.The result indicates that activity faults have some relation with sediment thick of the studied region.
Using Sato single scatter model,seismic waveform data recorded by 13 digital stations in north of Shanxi from 2001 to 2011 are calculated and analyzed.Correlation of Q value of coda wave to frequency is fitted for the coda wave window of 40s and variation of Q value with frequency in north of Shanxi is figured out.The highest Q0 value,which is up to 31.82,is at Yangyuan Station,whereas the lowest,31.82,is at Datong Station.That most stations in studied region show low Q0 value and high η value,which coincide with correlation of Q value and frequency,illustrates that non-uniform degree of underground medium is high and that tectonic activity is intensive in the region.In addition,compared with other stations with low Q0 value,Datong,Youyu and Pianguan stations that show low Q0 value just locate at Kouquan fault of NNE direction in northwest of Shanxi province,being detached with Hengshan and Liulengshan fault by the basin.The result indicates that activity faults have some relation with sediment thick of the studied region.
引文
[1]刘巍,安卫平,赵新平.1989年大同一阳高6.1级地震[J].中国地震,1992,8(3):19-27.
[2]徐扬,田勇,啜永清,等.大同—阳高6.1级震群震源区及其附近地区地壳三维P波速度结构反演[J].山西地震,1997(z1):29-34.
[3]宋美琴,郑勇,葛粲,等.山西地震带中小震精确位置及其显示的山西地震构造特征[J].地球物理学报,2012,55(2):513-525.
[4]宋美琴,王秀文,梁向军,等.山西代县震群序列特征及其指示意义[J].山西地震,2007(2):10-12.
[5]宋美琴,梁向军,李斌.2009年3月28日原平ML4序列特征及其对周边形势的影响[J].地震地磁观测与研究,2012,33(3-4):19-25.
[6]啜永清,张淑亮,苏燕,等.大同地震序列的尾波Q值变化特征研究[J].地震,2004,24(2):66-72.
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[9]宋美琴,王秀文,梁向军,等.利用数字化地震波形资料研究山西中南部地区的非弹性衰减系数、震源参数和场地响应[J].山西地震,2007(4):1-15.
[10]宋美琴,梁向军,宁亚灵.山西地区构造环境剪应力场研究[J].山西地震,2008(2):1-8.
[11]Sato H.Energy propagation including scattering effect:Single isotropic scattering,approximation[J].Bull Seis SocAmer,1977(68):923-948.
[12]Domingguez T,Rebollar C J.Attenuation of coda waves atthe Cerro Prieto Geothermal Field,Baja California,Mexico[J].Bull Seis Soc Amer,1997(87):1368-1374.
[13]Pulli J.Atenuation of coda wave in New England[J].BullSeis Soc Amer,1984:1149-1166.
[14]李白基,秦嘉政,钱晓东,等.云南姚安地区的尾波衰减[J].地震学报,2004,24(1):47-52.
[15]朱新运,杨钢宇,张震峰,等.基于Sato模型的近震s波尾波Q值求解及分析软件研制[J].地震地磁观测与研究,2005,26(3):63-70.
[16]吕坚,新运,高建华,等.利用Sato模型研究九江—瑞昌地震序列的Qc值特征[J].大地测量与地球动力学,2007,27(2):32-36.
[17]王伟君,刘杰.1999年岫岩地震序列尾波Q。的变化过程[J].地震,2004,24(4):38-44.
[18]师海阔,朱新运,贺永忠,等.利用Sato模型对宁夏及邻区尾波Q值的研究[J].地震,2011,31(1):118-126.
[19]杨景春.大同盆地新构造运动与构造地貌特征[A]∥王乃梁.山西地堑系新生代沉积与构造特征.北京:科学出版社,1996:219-234.
[20]谢新生,江娃利,王瑞,等.山西大同盆地口泉断裂全新世古地震活动[J].地震地质,2003,25(3):359-373.
[21]江娃利,王焕贞,谢新生,等.山西大同盆地恒山北缘断裂全新世古地震活动[J].中国地震,2003,19(1):8-19.
[22]An Shu Jin and k.Aki.Spatial and temporal Correlationbetween coda Q and seicmicity in China[J].Bull seis SocAmer,1988,78(2):741-769.
[23]M7专项工作组.中国大陆大地震中—长期危险性研究[M].北京:地震出版社,2012.
[2]徐扬,田勇,啜永清,等.大同—阳高6.1级震群震源区及其附近地区地壳三维P波速度结构反演[J].山西地震,1997(z1):29-34.
[3]宋美琴,郑勇,葛粲,等.山西地震带中小震精确位置及其显示的山西地震构造特征[J].地球物理学报,2012,55(2):513-525.
[4]宋美琴,王秀文,梁向军,等.山西代县震群序列特征及其指示意义[J].山西地震,2007(2):10-12.
[5]宋美琴,梁向军,李斌.2009年3月28日原平ML4序列特征及其对周边形势的影响[J].地震地磁观测与研究,2012,33(3-4):19-25.
[6]啜永清,张淑亮,苏燕,等.大同地震序列的尾波Q值变化特征研究[J].地震,2004,24(2):66-72.
[7]靳玉科,梁向军,赵虎明,等.山西代县震群尾波Q值研究[J].山西地震,2008(1):6-9.
[8]梁向军,宋美琴,董春丽,等.山西太原东山地震台附近地区地震尾波Qc值变化特征研究[J].山西地震,2007(4):7-10.
[9]宋美琴,王秀文,梁向军,等.利用数字化地震波形资料研究山西中南部地区的非弹性衰减系数、震源参数和场地响应[J].山西地震,2007(4):1-15.
[10]宋美琴,梁向军,宁亚灵.山西地区构造环境剪应力场研究[J].山西地震,2008(2):1-8.
[11]Sato H.Energy propagation including scattering effect:Single isotropic scattering,approximation[J].Bull Seis SocAmer,1977(68):923-948.
[12]Domingguez T,Rebollar C J.Attenuation of coda waves atthe Cerro Prieto Geothermal Field,Baja California,Mexico[J].Bull Seis Soc Amer,1997(87):1368-1374.
[13]Pulli J.Atenuation of coda wave in New England[J].BullSeis Soc Amer,1984:1149-1166.
[14]李白基,秦嘉政,钱晓东,等.云南姚安地区的尾波衰减[J].地震学报,2004,24(1):47-52.
[15]朱新运,杨钢宇,张震峰,等.基于Sato模型的近震s波尾波Q值求解及分析软件研制[J].地震地磁观测与研究,2005,26(3):63-70.
[16]吕坚,新运,高建华,等.利用Sato模型研究九江—瑞昌地震序列的Qc值特征[J].大地测量与地球动力学,2007,27(2):32-36.
[17]王伟君,刘杰.1999年岫岩地震序列尾波Q。的变化过程[J].地震,2004,24(4):38-44.
[18]师海阔,朱新运,贺永忠,等.利用Sato模型对宁夏及邻区尾波Q值的研究[J].地震,2011,31(1):118-126.
[19]杨景春.大同盆地新构造运动与构造地貌特征[A]∥王乃梁.山西地堑系新生代沉积与构造特征.北京:科学出版社,1996:219-234.
[20]谢新生,江娃利,王瑞,等.山西大同盆地口泉断裂全新世古地震活动[J].地震地质,2003,25(3):359-373.
[21]江娃利,王焕贞,谢新生,等.山西大同盆地恒山北缘断裂全新世古地震活动[J].中国地震,2003,19(1):8-19.
[22]An Shu Jin and k.Aki.Spatial and temporal Correlationbetween coda Q and seicmicity in China[J].Bull seis SocAmer,1988,78(2):741-769.
[23]M7专项工作组.中国大陆大地震中—长期危险性研究[M].北京:地震出版社,2012.
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