利用Sato模型研究邢台震区尾波Q_C值特征
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摘要
利用Sato单次散射模型和红山台的近场数字地震记录研究了邢台震区尾波QC值的变化特征,得到QC值随频率的变化关系:即窗长为15~30 s时QC=(42.9±20.7)f(0.98±0.13);窗长为40~60 s时QC=(103.1±27.9)f(0.85±0.08)。通过分析不同频率点随时间的变化曲线,发现2002年4月22日邢台隆尧5.0级地震前高频部分QC值出现"升高—降低—再升高—发震"的发震模式,对预测邢台地区的中强震的发生有一定的参考意义。还发现相对Aki模型而言Sato模型更适合邢台震区的尾波计算和分析。
Using the Sato single isotropic scattering model and the near-field digital seismic records from Hongshan seismostation in Hebei province,the variation characteristics of S-code QC value in Xingtai seismic region are studied.The relationship between the QC value and frequency is obtained: while the length of windows are 15～30 s,QC=(42.9±20.7)f(0.98±0.13),and while the length of windows are 40～60 s,QC=(103.1±27.9)f(0.85±0.08).Through analyzing the variation curves of QC along with time in different frequency point,it is found that before Longyao ML 5.0 earthquake on April 22,2002,in Xingtai seismic region,the high-frequency part of QC value changed as "increasing→reducing→re-elevating→shocking" pattern,and this pattern has certain referent significance for moderate-strong earthquake prediction in Xingtai area.It is also found in the research that comparing with Aki model,the Sato model is better for the S-code computation and analysis in Xingtai seismic region.
Using the Sato single isotropic scattering model and the near-field digital seismic records from Hongshan seismostation in Hebei province,the variation characteristics of S-code QC value in Xingtai seismic region are studied.The relationship between the QC value and frequency is obtained: while the length of windows are 15～30 s,QC=(42.9±20.7)f(0.98±0.13),and while the length of windows are 40～60 s,QC=(103.1±27.9)f(0.85±0.08).Through analyzing the variation curves of QC along with time in different frequency point,it is found that before Longyao ML 5.0 earthquake on April 22,2002,in Xingtai seismic region,the high-frequency part of QC value changed as "increasing→reducing→re-elevating→shocking" pattern,and this pattern has certain referent significance for moderate-strong earthquake prediction in Xingtai area.It is also found in the research that comparing with Aki model,the Sato model is better for the S-code computation and analysis in Xingtai seismic region.
引文
[1]Aki K.Analysis of the seismic coda of local earthquakes asscatter waves[J].J.Geophys.Res.,1969,74:615-631.
[2]Chouet B,Aki K,Tsujiura M.Regional variation of the scalinglaw of earthquake source spectra[J].Bull.Seism.Soc.A-mer.,1978,68:49-79.
[3]Peng J Y,Aki K,Chouet B,et al.Temporal change in codaQassociated with the Round Valley,California,earthquake ofNovember 23,1984[J].J.Geophys.Res.,1987,92(B5):3507-3526.
[4]Sato H.Temporal changes in scattering and attenuation associ-ated with the earthquake occurrence——a reviewof recentstudies on coda waves[J].Pure App.Geophys.,1988,126:465-497.
[5]Beroza G C,Cole A T,Ellsworth W L.Stability of coda waveattenuation during the Loma Prieta,California earthquake se-quence[J].J.Geophys.Res.,1995,100(B3):3977-3987.
[6]王伟君,刘杰.1999年岫岩地震序列尾波QC的变化过程[J].地震,2004,24(4):37-44.
[7]马宏生,刘杰,张国民,等.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.
[8]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.
[9]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.
[10]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.
[11]Sato H.Energy propagation including scattering effect:Sin-gle isotropic scattering,approximation[J].Bull.Seism.Soc.Amer.,1977,68:923-948.
[12]Domingguez T,Rebollar C J.Attenuation of coda waves atthe Cerro Prieto Geothermal Field,Baja California,Mexico[J],Bull.Seism.Soc.Amer.,1997,87:1 368-1374.
[13]Pulli J.Attenuation of coda wave in New England.Bull.Seism.Soc.Amer.,1984,74:1149-1166.
[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,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.
[16]Nuttli O W.Lg magnitudes and yield estimates for underground Navaya Zemlya nuclear explosions[J].Bull.Seism.Soc.Amer.,1988,78:873-884.
[17]束沛镒,张学民,刁桂苓,等.利用纯S波输入研究地震台站下方的横波速度结构[J].地球物理学报,2001,45(1):67-75.
[18]张学民,刁桂苓,夏乱保.河北省强震区内外深部S波速度结构特征研究[J].华北地震科学.2001,19(3):1-14.
[19]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.
[20]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.
[21]秦嘉政,刘祖荫,龙晓帆.滇西实验场两次中强地震前后尾波衰减的区域特征分析[J].中国地震,1995,11(3):212-221.
[22]Yoshihiro H,Nobuhiko H,Muneyoshi F,et al.Temporalchanges in codaQ-1andbvalue due to the static stress chan-ges associated with the 1995 Hyogo-ken Nanbu earthquke[J].J.Geophys.Res.,2000,105(B3):6141-6151.
[23]王彩勤,郑斯华,刁桂苓,等.张北地震序列的尾波Q值研究[J].防震减灾工程学报,2004,24(1):37-40.
[24]Zeng Y,Su F,Aki K.Scattering wave energy propagation ina random isotropic scattering medium,1 Theory[J].J.Geo-phys.Res.,1991,96:607-619.
[2]Chouet B,Aki K,Tsujiura M.Regional variation of the scalinglaw of earthquake source spectra[J].Bull.Seism.Soc.A-mer.,1978,68:49-79.
[3]Peng J Y,Aki K,Chouet B,et al.Temporal change in codaQassociated with the Round Valley,California,earthquake ofNovember 23,1984[J].J.Geophys.Res.,1987,92(B5):3507-3526.
[4]Sato H.Temporal changes in scattering and attenuation associ-ated with the earthquake occurrence——a reviewof recentstudies on coda waves[J].Pure App.Geophys.,1988,126:465-497.
[5]Beroza G C,Cole A T,Ellsworth W L.Stability of coda waveattenuation during the Loma Prieta,California earthquake se-quence[J].J.Geophys.Res.,1995,100(B3):3977-3987.
[6]王伟君,刘杰.1999年岫岩地震序列尾波QC的变化过程[J].地震,2004,24(4):37-44.
[7]马宏生,刘杰,张国民,等.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.
[8]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.
[9]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.
[10]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.
[11]Sato H.Energy propagation including scattering effect:Sin-gle isotropic scattering,approximation[J].Bull.Seism.Soc.Amer.,1977,68:923-948.
[12]Domingguez T,Rebollar C J.Attenuation of coda waves atthe Cerro Prieto Geothermal Field,Baja California,Mexico[J],Bull.Seism.Soc.Amer.,1997,87:1 368-1374.
[13]Pulli J.Attenuation of coda wave in New England.Bull.Seism.Soc.Amer.,1984,74:1149-1166.
[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,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.
[16]Nuttli O W.Lg magnitudes and yield estimates for underground Navaya Zemlya nuclear explosions[J].Bull.Seism.Soc.Amer.,1988,78:873-884.
[17]束沛镒,张学民,刁桂苓,等.利用纯S波输入研究地震台站下方的横波速度结构[J].地球物理学报,2001,45(1):67-75.
[18]张学民,刁桂苓,夏乱保.河北省强震区内外深部S波速度结构特征研究[J].华北地震科学.2001,19(3):1-14.
[19]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.
[20]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.
[21]秦嘉政,刘祖荫,龙晓帆.滇西实验场两次中强地震前后尾波衰减的区域特征分析[J].中国地震,1995,11(3):212-221.
[22]Yoshihiro H,Nobuhiko H,Muneyoshi F,et al.Temporalchanges in codaQ-1andbvalue due to the static stress chan-ges associated with the 1995 Hyogo-ken Nanbu earthquke[J].J.Geophys.Res.,2000,105(B3):6141-6151.
[23]王彩勤,郑斯华,刁桂苓,等.张北地震序列的尾波Q值研究[J].防震减灾工程学报,2004,24(1):37-40.
[24]Zeng Y,Su F,Aki K.Scattering wave energy propagation ina random isotropic scattering medium,1 Theory[J].J.Geo-phys.Res.,1991,96:607-619.
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