1830年磁县7.5级地震震源区尾波衰减特征
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摘要
利用磁县数字地震台记录到的近震波形资料,采用Aki尾波单次散射模型,计算1830年磁县7.5级大地震震源区50 km范围内的尾波Qc值;经多地震拟合得出在尾波流逝时间为20 s时,Qc=(70.2±29.3)f(0.8054±0.1615);40 s,时Qc=(96.6±25.3)f(0.7772±0.1098)。结果表明,磁县震源区Q0值较低,震区地震波衰减比邢台、唐山震区快;η值表明Qc值对频率的依赖性弱于邢台和唐山震区。
Based on digital waveform data of local earthquakes,using coda Aki single scattering model the coda Qc value of stations around 50 km in 1830 CiXian,M7.5 earthquake region are calculated through seismic casualties fitting.The result indicate that when lapse time is 20 s,the coda Qc is: Qc=(70.2±29.3)f(0.865 4±0.161 5);when the lapse is 40 s,the coda Qc is: Qc=(96.6±25.3)f(0.777 2±0.109 8).The results show that Qc value of coda is lower and the attenuation of seismic waves in Cixian'seismic area are faster than that in Xingtai,Tangshan Earthquake area;η values show that the dependence of Qc value to frequency is weaker than that in the Xingtai and Tangshan earthquake area.
Based on digital waveform data of local earthquakes,using coda Aki single scattering model the coda Qc value of stations around 50 km in 1830 CiXian,M7.5 earthquake region are calculated through seismic casualties fitting.The result indicate that when lapse time is 20 s,the coda Qc is: Qc=(70.2±29.3)f(0.865 4±0.161 5);when the lapse is 40 s,the coda Qc is: Qc=(96.6±25.3)f(0.777 2±0.109 8).The results show that Qc value of coda is lower and the attenuation of seismic waves in Cixian'seismic area are faster than that in Xingtai,Tangshan Earthquake area;η values show that the dependence of Qc value to frequency is weaker than that in the Xingtai and Tangshan earthquake area.
引文
[1]张天中.滇西试验场区的Q值及其随时间窗的变化[J].地震学报,1990,12(1):12-21.
[2]马云生.北京及周围地区的尾波Qc分布特征的研究[J].地震学报,1995,17(4):448-458.
[3]周焕鹏.菏泽5.9级地震前后地震尾波的衰减特征[J].华北地震科学,1990,8(4):47-55.
[4]季爱东,刘希强,赵英萍,等.山东地区尾波衰减特征(Qc)研究[J].华北地震科学,2008,26(1):8-12.
[5]马宏生,刘杰,张国民.尾波Qc值随时间变化在地震预测中应用的研究[J].地震,2005,25(4):39-48.
[6]秦嘉政,李白基,钱晓东,等.云南武定地震余震近场尾波衰减的区域特征[J].地震学报,2001,23(1):87-97.
[7]刁桂苓,张四昌,赵军,等.用现今小地震研究历史强震的震源断层—以1830年河北磁县7.5级地震为例[J].地震地质,1999,21(2):121-126.
[8]张小涛,韩丽萍,张双凤.等.邯郸-邢台地区尾波Qc值分布特征研究[J].大地测量与地球动力学,2007,27(4):119-123.
[9]王彩勤,刁桂苓,李雪英,等.唐山地区尾波Qc值研究[J].华北地震科学,2006,24(1):13-15.
[10]Aki K,Chouet B.Origin of coda waves:source,attenuation and scattering effects[J].J Geophys Res,1975,80:3 322-3 342.
[11]张小涛,吕坚,马广庆,等.双差地震定位法在邯邢地区地震精确定位中的初步应用[J].地震研究,2008,31(1):37-41.
[12]朱新运,刘杰,张帆,等,基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(1):76-80.
[13]Peng J Y,Aki K,Chouet B,et al.Temporal change in coda Qassociated with the Round Valley,California,earthquake of November 23,1984[J].J Geophys Res,1987,92(B5):3 507-3 526.
[14]张小涛,马广庆,孙晴,等.邯郸-邢台地区尾波衰减特征研究[J].华北地震科学,2007,25(2):29-32.
[15]Pulli J.Attenuation of coda wave in New England[J].BSSA,1984,1 149-1 166.
[16]苏伟,吴建平,明跃红,等.Lg尾波Q0值与中国大陆及邻区的地质构造关系[J].2006,28(2):132-140.
[2]马云生.北京及周围地区的尾波Qc分布特征的研究[J].地震学报,1995,17(4):448-458.
[3]周焕鹏.菏泽5.9级地震前后地震尾波的衰减特征[J].华北地震科学,1990,8(4):47-55.
[4]季爱东,刘希强,赵英萍,等.山东地区尾波衰减特征(Qc)研究[J].华北地震科学,2008,26(1):8-12.
[5]马宏生,刘杰,张国民.尾波Qc值随时间变化在地震预测中应用的研究[J].地震,2005,25(4):39-48.
[6]秦嘉政,李白基,钱晓东,等.云南武定地震余震近场尾波衰减的区域特征[J].地震学报,2001,23(1):87-97.
[7]刁桂苓,张四昌,赵军,等.用现今小地震研究历史强震的震源断层—以1830年河北磁县7.5级地震为例[J].地震地质,1999,21(2):121-126.
[8]张小涛,韩丽萍,张双凤.等.邯郸-邢台地区尾波Qc值分布特征研究[J].大地测量与地球动力学,2007,27(4):119-123.
[9]王彩勤,刁桂苓,李雪英,等.唐山地区尾波Qc值研究[J].华北地震科学,2006,24(1):13-15.
[10]Aki K,Chouet B.Origin of coda waves:source,attenuation and scattering effects[J].J Geophys Res,1975,80:3 322-3 342.
[11]张小涛,吕坚,马广庆,等.双差地震定位法在邯邢地区地震精确定位中的初步应用[J].地震研究,2008,31(1):37-41.
[12]朱新运,刘杰,张帆,等,基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(1):76-80.
[13]Peng J Y,Aki K,Chouet B,et al.Temporal change in coda Qassociated with the Round Valley,California,earthquake of November 23,1984[J].J Geophys Res,1987,92(B5):3 507-3 526.
[14]张小涛,马广庆,孙晴,等.邯郸-邢台地区尾波衰减特征研究[J].华北地震科学,2007,25(2):29-32.
[15]Pulli J.Attenuation of coda wave in New England[J].BSSA,1984,1 149-1 166.
[16]苏伟,吴建平,明跃红,等.Lg尾波Q0值与中国大陆及邻区的地质构造关系[J].2006,28(2):132-140.
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