滇南、滇西南地区尾波Q_c值研究
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摘要
利用滇南、滇西南地区14个数字地震台站记录到的2005年1月至2010年9月间的ML≥2.5级地震数字波形资料,采用Aki单次散射模型,计算了台站周围50 km范围内共283条地震记录的尾波Qc和Q0值.结果表明:滇南地区尾波Qc值与频率的关系为Qc(f)=65.7 f0.83;滇西南地区Qc值与频率的关系为Qc(f)=64.5 f0.903(沧源台除外).两区域平均Q0值相比云南其他构造活动强烈区域的Q0值稍高,但相比其他区域仍然偏低,属于较高构造活动地区.尾波衰减Qc-1值变化与云南武定地区和施甸地区的结果比较接近,具有构造运动活跃、地震活动较频繁的低Qc值特征.
The coda-wave-attenuation-quality factor Q0 in Southern and southwestern Yunnan is estimated using Aki`s single-scattering attenuation model based on 283 digital seismic waveforms recorded by 14 regional digital seismic stations within 50 km from January 2005 to September 2010.The result shows that the relationship between Q0and f of southern Yunnan can be described as Qc(f)=65.7 f 0.83,the relationship between Q0 and f of southwest Yunnan can be described as Qc(f)=64.5 f 0.903.The values are a little higher compared with the other areas of Yunnan with strong tectonic seismic activity,but steel belongs to inferior level,and it belongs to the tectonic activity area.Changes of coda wave attenuation Q-1c is close to Wuding and Shidian area of Yunnan,all have the low Qc value features of active tectonic movement and frequency seismic activity.
The coda-wave-attenuation-quality factor Q0 in Southern and southwestern Yunnan is estimated using Aki`s single-scattering attenuation model based on 283 digital seismic waveforms recorded by 14 regional digital seismic stations within 50 km from January 2005 to September 2010.The result shows that the relationship between Q0and f of southern Yunnan can be described as Qc(f)=65.7 f 0.83,the relationship between Q0 and f of southwest Yunnan can be described as Qc(f)=64.5 f 0.903.The values are a little higher compared with the other areas of Yunnan with strong tectonic seismic activity,but steel belongs to inferior level,and it belongs to the tectonic activity area.Changes of coda wave attenuation Q-1c is close to Wuding and Shidian area of Yunnan,all have the low Qc value features of active tectonic movement and frequency seismic activity.
引文
[1]AKI K.Analysis of the seismic coda of locad earthquakescattered waves[J].J Geophys Res,1969,74:615-631.
[2]HERMANN R B.Qestimates using the coda of local earth-quakes[J].Bull Seis Soc Am,1980,70,447-468.
[3]JIN A,AKI K.Temporal changein Q before the Tangshanearthquakeof 1976 and the Haicheng earthquake of 1975J[J].J Geophys Res,1986,91:665-673.
[4]XIE J,NUTTLI O W.Interpretion of high-frequency codaat large distances stochastic modeling and method of in-version[J].Geophysical J Int,1988,95(3):579-595.
[5]AKI K,CHOUET B.Origin of coda waves:source,atten-uation,andscattering effects[J].Geophys Res,1975,80:3 322-3 342.
[6]秦嘉政,阚荣举.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,1986,9(2):145-156.
[7]秦嘉政.云南地区短周期波区域Q值与地震烈度衰减关系[A]//闵子群.云贵地区地震危险性研究文集[C].昆明:云南科技出版社,1989:253-260.
[8]王伟君,刘杰.1999年岫岩地震序列尾波Qc值变化过程[J].地震,2004,24(4):37-44.
[9]马宏生,刘杰,张国民,等.云南地区尾波Q值的分布特征及其初步解释[J].地震,2006,26(3):37-431.
[10]陈学庭.澜沧和耿马大地震Q值随时间的变化[M].中国地球物理学会年刊.北京:地震出版社,1992:53.
[11]李白基,秦嘉政,谢庆茵,等.云南武定1995年地震余震尾波Qc[J].地震地磁观测与研究,2000,21(2):126.
[12]李白基,秦嘉政,罗娣华,等.云南丽江峡谷的场地放大[J].地震学报,1999,21(2):175-179.
[13]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,2004,26(1):47-52.
[14]钱晓东,李白基,秦嘉政.2001年云南施甸Ms5.9地震余震序列尾波Qc值研究[J].地震地磁观测与研究,2004,25(1):9-17.
[15]陈立德.1979年3月15日云南普洱6.8级地震[A].中国地震局.中国震例[C].北京:地震出版社,1990:302-326.
[16]钱晓东,李白基,秦嘉政.2001年云南施甸Ms5.9地震余震系列尾波Qc值研究[J].地震地磁观测与研究,25(1):9-17.
[17]钱晓东,秦嘉政,李白基.澜沧江流域水电工程地区的尾波衰减[J].地震研究,2006,29(3):215-219.
[18]赵小艳,付虹,毛玉平,等.云鹏水电站及其周围地震尾波Qc值研究[J].地震研究,2010,33(1):55-62.
[19]王伟君,刘杰,陈凌.云南地区尾波衰减特征研究[J],地震学报,2006,28(1):8-19.
[20]李琼,秦嘉政,钱晓东.2007年宁洱6.4级地震余震序列尾波Q值研究[J].地震研究,2007,30(4):337-343.
[2]HERMANN R B.Qestimates using the coda of local earth-quakes[J].Bull Seis Soc Am,1980,70,447-468.
[3]JIN A,AKI K.Temporal changein Q before the Tangshanearthquakeof 1976 and the Haicheng earthquake of 1975J[J].J Geophys Res,1986,91:665-673.
[4]XIE J,NUTTLI O W.Interpretion of high-frequency codaat large distances stochastic modeling and method of in-version[J].Geophysical J Int,1988,95(3):579-595.
[5]AKI K,CHOUET B.Origin of coda waves:source,atten-uation,andscattering effects[J].Geophys Res,1975,80:3 322-3 342.
[6]秦嘉政,阚荣举.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,1986,9(2):145-156.
[7]秦嘉政.云南地区短周期波区域Q值与地震烈度衰减关系[A]//闵子群.云贵地区地震危险性研究文集[C].昆明:云南科技出版社,1989:253-260.
[8]王伟君,刘杰.1999年岫岩地震序列尾波Qc值变化过程[J].地震,2004,24(4):37-44.
[9]马宏生,刘杰,张国民,等.云南地区尾波Q值的分布特征及其初步解释[J].地震,2006,26(3):37-431.
[10]陈学庭.澜沧和耿马大地震Q值随时间的变化[M].中国地球物理学会年刊.北京:地震出版社,1992:53.
[11]李白基,秦嘉政,谢庆茵,等.云南武定1995年地震余震尾波Qc[J].地震地磁观测与研究,2000,21(2):126.
[12]李白基,秦嘉政,罗娣华,等.云南丽江峡谷的场地放大[J].地震学报,1999,21(2):175-179.
[13]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,2004,26(1):47-52.
[14]钱晓东,李白基,秦嘉政.2001年云南施甸Ms5.9地震余震序列尾波Qc值研究[J].地震地磁观测与研究,2004,25(1):9-17.
[15]陈立德.1979年3月15日云南普洱6.8级地震[A].中国地震局.中国震例[C].北京:地震出版社,1990:302-326.
[16]钱晓东,李白基,秦嘉政.2001年云南施甸Ms5.9地震余震系列尾波Qc值研究[J].地震地磁观测与研究,25(1):9-17.
[17]钱晓东,秦嘉政,李白基.澜沧江流域水电工程地区的尾波衰减[J].地震研究,2006,29(3):215-219.
[18]赵小艳,付虹,毛玉平,等.云鹏水电站及其周围地震尾波Qc值研究[J].地震研究,2010,33(1):55-62.
[19]王伟君,刘杰,陈凌.云南地区尾波衰减特征研究[J],地震学报,2006,28(1):8-19.
[20]李琼,秦嘉政,钱晓东.2007年宁洱6.4级地震余震序列尾波Q值研究[J].地震研究,2007,30(4):337-343.
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