依舒断裂带北段尾波Q值特征研究
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摘要
研究表明,地震波穿过构造活动相对稳定地区时,能量衰减不明显且具有高Q值;而穿过构造活动地区时,能量会发生强烈衰减且具有低Q值。本文利用Sato模型对依舒断裂带北段萝北-通河地区15个数字化地震台站记录到的266条M_L≥2.0地震尾波Q_c值进行了分析和研究,发现黑龙江萝北、通河附近地区Q_c值具有明显的复杂性和差异性,且萝北地区Q_c值远低于通河地区Q_c值,其原因一方面与区域构造活动有关,另一方面与区域地壳构造复杂、地下介质破碎、区域应力不断变化有关。本文还讨论了萝北、通河附近地区Q值随着频率变化的关系及Q_0值空间分布特征,有效地分析了该区域介质状态的变化过程,对萝北地区地震活动性的研究和预测有指导意义。
The study shows that when the seismic wave passes through a relatively stable area,the attenuation is not obvious and has a high value. And through the tectonic activity,the energy will be strongly attenuated and have a low value. In this paper,the Sato model was used to record more than two hundred M_L≥3.0 earthquakes recorded by 15 different stations in the north of LuobeiTonghe area( 44° ~ 49°N,126° ~ 136° E). Q_c values were analyzed and studied,and the Q value near Luobei,Heilongjiang have complexity and difference,and the reason is related to regional tectonic activity. Generally speaking,where tectonic activity and seismic activity are strong,the Q value is low. The value of coda wave of the Luobei area is much lower than that of the Tonghe area,which is related to the complex crust structure,the degree of underground media fragmentation and the change of internal stress in the Luobei and Tonghe area. This paper also discusses the relationship between the quality factor and the frequency change,and the spatial distribution characteristics of the quality factor and the Q_0 value are obtained,which can effectively analyze the process of the state of the media in the region,and which is very important for the research and prediction of the seismic activity in the Luobei area.
The study shows that when the seismic wave passes through a relatively stable area,the attenuation is not obvious and has a high value. And through the tectonic activity,the energy will be strongly attenuated and have a low value. In this paper,the Sato model was used to record more than two hundred M_L≥3.0 earthquakes recorded by 15 different stations in the north of LuobeiTonghe area( 44° ~ 49°N,126° ~ 136° E). Q_c values were analyzed and studied,and the Q value near Luobei,Heilongjiang have complexity and difference,and the reason is related to regional tectonic activity. Generally speaking,where tectonic activity and seismic activity are strong,the Q value is low. The value of coda wave of the Luobei area is much lower than that of the Tonghe area,which is related to the complex crust structure,the degree of underground media fragmentation and the change of internal stress in the Luobei and Tonghe area. This paper also discusses the relationship between the quality factor and the frequency change,and the spatial distribution characteristics of the quality factor and the Q_0 value are obtained,which can effectively analyze the process of the state of the media in the region,and which is very important for the research and prediction of the seismic activity in the Luobei area.
引文
高金哲、刘杰、桑成良等,2007,长白山天池火山地区的尾波Q值估计,中国地震,23(4),400~409.
李白基、秦嘉政、钱晓东等,2004,云南姚安地区的尾波衰减,地震学报,26(1),47~52.
刘长生、彭春红,2015,黑龙江省大庆地区尾波Q值特征研究,地震地磁观测与研究,36(2),1~5.
万永革,2016,地震学导论,484,北京:科学出版社.
朱新运、刘杰、张帆,2006,基于Aki模型的近震S波尾波Q值求解及分析软件研制,地震研究,29(1),76~80.
朱新运、杨钢宇、张震峰,2005,基于Sato模型的近震S波尾波Q值求解及分析软件研制,地震地磁观测与研究,26(3),63 ~70.
Aki K,1980,Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25Hz,Phys Earth Planet Inter,21(1),50~60.
Aki K,Chouet B,1975,Origin of Coda waves:source,attenuation,and scattering effects,J Geophys Res,80(23),3322~3342.
Herrmann R B,1980,Q estimates using the coda of local earthquakes,Bull Seismol Soc Am,70(2),447~468.
Rautian T G,Khalturin V I,1978,The use of coda for determination of the earthquake source spectrum,Bull Seismol Soc Am,68(4),923~948.
Rhea S,1984,Q determined from local earthquakes in the South Carolina Coastal plain,Bull Seismol Soc Am,74(6),2257~2268.
Sato H,1977,Energy propagation including scattering effects sengle isotropic scattering approximation,J Phys Earth,25(1),27~41.
Singh S,Herrmann R B,1983,Regionalization of crustal coda Q in the continental United States,J Geophys Res,88(B1),527~538.
李白基、秦嘉政、钱晓东等,2004,云南姚安地区的尾波衰减,地震学报,26(1),47~52.
刘长生、彭春红,2015,黑龙江省大庆地区尾波Q值特征研究,地震地磁观测与研究,36(2),1~5.
万永革,2016,地震学导论,484,北京:科学出版社.
朱新运、刘杰、张帆,2006,基于Aki模型的近震S波尾波Q值求解及分析软件研制,地震研究,29(1),76~80.
朱新运、杨钢宇、张震峰,2005,基于Sato模型的近震S波尾波Q值求解及分析软件研制,地震地磁观测与研究,26(3),63 ~70.
Aki K,1980,Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25Hz,Phys Earth Planet Inter,21(1),50~60.
Aki K,Chouet B,1975,Origin of Coda waves:source,attenuation,and scattering effects,J Geophys Res,80(23),3322~3342.
Herrmann R B,1980,Q estimates using the coda of local earthquakes,Bull Seismol Soc Am,70(2),447~468.
Rautian T G,Khalturin V I,1978,The use of coda for determination of the earthquake source spectrum,Bull Seismol Soc Am,68(4),923~948.
Rhea S,1984,Q determined from local earthquakes in the South Carolina Coastal plain,Bull Seismol Soc Am,74(6),2257~2268.
Sato H,1977,Energy propagation including scattering effects sengle isotropic scattering approximation,J Phys Earth,25(1),27~41.
Singh S,Herrmann R B,1983,Regionalization of crustal coda Q in the continental United States,J Geophys Res,88(B1),527~538.