内蒙古中西部地区尾波Q值研究
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摘要
基于Sato单次散射模型,利用2001-2006年6月内蒙古数字地震台网记录到的发生在内蒙古中西部地区的114条ML≥2.7地震波形资料,从西到东分三个研究区对内蒙古中西部地区尾波Q值进行了研究,研究中首先计算各条记录尾波4~18 Hz间15个频率点的尾波Q值,并对Q值与频率之间的依赖关系进行了拟合,拟合结果为:Ⅰ区Qc(f)=(69.98±20.92)f(0.8989±0.0881);Ⅱ区Qc(f)=(55.59±14.726)f(0.9426±0.1084);Ⅲ区Qc(f)=(69.89±18.54)f(0.8352±0.0913)。研究结果表明,尾波值表现出明显的分区性特征,研究区Ⅰ、Ⅲ表现为高Q值,研究区Ⅱ为低Q值,其结果可能与内蒙古中西部地区独特的构造分区特征有关。
According to Sato single scattering model and using 114 earthquakes with ML≥2.7 in Midwestern region of Inner Mongolia recorded by Inner Mongolia digital network from 2001 to June 2006,the coda quality factors of the three regions have been studied from west to east in Midwestern region of Inner Mongolia.Above all the code quality factors of every earthquake from 4 Hz to 18 Hz with 15 frequency points is calculated;the relation between Q value and frequency is fitted,the results show that region Ⅰ is Qc(f)=(69.98±20.92)f(0.8989±0.0881),region Ⅱis Qc(f)=(55.59±14.726)f(0.9426±0.1084),region Ⅲ is Qc(f)=(69.89±18.54)f(0.8352±0.0913).The research shows that there are obvious zoning characteristics,regionⅠand Ⅲ is high Q value;region Ⅱ is low Q value,this result shows that there is definite relation between particular structural type zoning and code Q value.
According to Sato single scattering model and using 114 earthquakes with ML≥2.7 in Midwestern region of Inner Mongolia recorded by Inner Mongolia digital network from 2001 to June 2006,the coda quality factors of the three regions have been studied from west to east in Midwestern region of Inner Mongolia.Above all the code quality factors of every earthquake from 4 Hz to 18 Hz with 15 frequency points is calculated;the relation between Q value and frequency is fitted,the results show that region Ⅰ is Qc(f)=(69.98±20.92)f(0.8989±0.0881),region Ⅱis Qc(f)=(55.59±14.726)f(0.9426±0.1084),region Ⅲ is Qc(f)=(69.89±18.54)f(0.8352±0.0913).The research shows that there are obvious zoning characteristics,regionⅠand Ⅲ is high Q value;region Ⅱ is low Q value,this result shows that there is definite relation between particular structural type zoning and code Q value.
引文
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[3]Rhea S.Qdetermined from local earthquakes in the South Carolina Coastal plain[J].Bull Seis SocAmer,1984,74:2 257-2 268.
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[8]李白基,秦嘉政,钱晓东,等.云南姚安地区尾波衰减[J].地震学报,2004,26(1):47-52.
[9]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.
[10]马云生.北京及周围地区尾波Q值分布特征的研究[J].地震学报,1995,17(4):448-458.
[11]Vivtor Wang.Attenuation of Coda Wave at the Tres Virgenes Volcanic Area,Baja Californiaa sur,Mexico[J].Bull Seism Ssoc Amer,2001,91(4):683-693.
[12]Aki K.Analysis of seismic coda of local earthqukes as scattered wave[J].J Geophys Res,1969,74:615-631.
[13]Aki K,Chout B.Origin of Coda wave:source,attenuation and sattering effects[J].J Geophys Res,1975,80:3 322-3 342.
[14]Pulli J J.Attenuation of coda waves in New England[J].Bull Seis Soc Amer,1984,74:1 149-1 166.
[15]孙加林,杨毅,曹井泉.1996年包头西6.4级地震震兆特征的特殊性[J].地震,1998,18(3):233-239.
[16]高立新,郑斯华.内蒙古中西部地区中小地震震源参数反演和相互关系探讨[J].地震研究,2004,27(4):296-300.
[17]朱新运,张帆.浙江及邻区尾波Q值研究[J].西北地震学报,2006,28(2):108-113.
[18]朱新运,杨钢宇,张震峰.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.
[19]Ambeh WB,Faikhead JD,CodaQestimates in the mount Comeroon Volcanic region,west Africa[J].Bull Seis Soc Amer,1989,79:1 589-1 600.
[2]Singh S,Herrmann R B.Regionalization of crustal codaQin the continental United Stated[J].JGrephys Res,1983,88:527-538.
[3]Rhea S.Qdetermined from local earthquakes in the South Carolina Coastal plain[J].Bull Seis SocAmer,1984,74:2 257-2 268.
[4]Jin A,Cao T,Aki K.Regional change of codaQin oceanic lithosphere[J].J Grephys Res,1985,90:8 651-8 659.
[5]Chout B.Temporal Variation in the attenuation of earthquake coda near Stone Canyon,California[J].Geophys Res Lett,1979,6:143-146.
[6]Jin A,Aki K.Spatial and temporal correlation betweenQ-1and seismicity and its physical mecha-nism[J].J Geophys Res,1989,94:14 041-14 059.
[7]荣代潞,李亚荣,金铭.甘肃近期2次中强震前后震源区微震尾波(Qc)的变化特征[J].高原地震,2000,12(2):11-24.
[8]李白基,秦嘉政,钱晓东,等.云南姚安地区尾波衰减[J].地震学报,2004,26(1):47-52.
[9]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.
[10]马云生.北京及周围地区尾波Q值分布特征的研究[J].地震学报,1995,17(4):448-458.
[11]Vivtor Wang.Attenuation of Coda Wave at the Tres Virgenes Volcanic Area,Baja Californiaa sur,Mexico[J].Bull Seism Ssoc Amer,2001,91(4):683-693.
[12]Aki K.Analysis of seismic coda of local earthqukes as scattered wave[J].J Geophys Res,1969,74:615-631.
[13]Aki K,Chout B.Origin of Coda wave:source,attenuation and sattering effects[J].J Geophys Res,1975,80:3 322-3 342.
[14]Pulli J J.Attenuation of coda waves in New England[J].Bull Seis Soc Amer,1984,74:1 149-1 166.
[15]孙加林,杨毅,曹井泉.1996年包头西6.4级地震震兆特征的特殊性[J].地震,1998,18(3):233-239.
[16]高立新,郑斯华.内蒙古中西部地区中小地震震源参数反演和相互关系探讨[J].地震研究,2004,27(4):296-300.
[17]朱新运,张帆.浙江及邻区尾波Q值研究[J].西北地震学报,2006,28(2):108-113.
[18]朱新运,杨钢宇,张震峰.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.
[19]Ambeh WB,Faikhead JD,CodaQestimates in the mount Comeroon Volcanic region,west Africa[J].Bull Seis Soc Amer,1989,79:1 589-1 600.
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