新疆北天山西段P波、S波衰减特征研究
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摘要
针对2008年1月至2011年12月发生在新疆北天山西段的地震事件,分析新源、温泉和巴仑台3个台站记录到的波形资料,采取尾波归一化方法,计算出P、S波在多个频率点f的衰减系数Q-1P、Q-1S,利用最小二乘法拟合得到Q-1=Q0fη,得到该区域P波衰减系数和S波衰减系数。结果表明,新源研究区关于P波、S波的衰减指数为-0.982 1、-0.978 1;温泉研究区关于P波、S波的衰减指数为-1.049 7、-0.773 8;巴仑台研究区关于P波、S波的衰减指数为-0.870 0、-0.956 8。与中国云南地区关于P波、S波衰减结果相比,新源研究区域与云南的禄劝研究区地下介质衰减特性比较一致。
According to seismic events in west section of northern Tianshan from January,2008 to December,2011, this paper using coda-normalization method analyzed digital wave-record of Xinyuan,Wenquan and Baluntai stations to calculate attenuation coefficient of P wave-Q-1Pand S wave-Q-1Sunder several frequencies,then they got Q-1= Q0fηby least squares method. The result showed: the attenuation-index of P and S in Xinyuan is-0. 982 1 and-0. 978 1,the attenuationindex of P and S in Wenquan is-1. 049 7 and-0. 773 8,the attenuation-index of P and S in is-0. 870 0 and-0. 956 8. Comparing with Yunan,attenuation characteristics of underground medium in Xinyuan and Luquan in Yunnan province is very similar.
According to seismic events in west section of northern Tianshan from January,2008 to December,2011, this paper using coda-normalization method analyzed digital wave-record of Xinyuan,Wenquan and Baluntai stations to calculate attenuation coefficient of P wave-Q-1Pand S wave-Q-1Sunder several frequencies,then they got Q-1= Q0fηby least squares method. The result showed: the attenuation-index of P and S in Xinyuan is-0. 982 1 and-0. 978 1,the attenuationindex of P and S in Wenquan is-1. 049 7 and-0. 773 8,the attenuation-index of P and S in is-0. 870 0 and-0. 956 8. Comparing with Yunan,attenuation characteristics of underground medium in Xinyuan and Luquan in Yunnan province is very similar.
引文
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[5]刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源系数和场地响应[J].地震学报,2003,25(2):211-218.
[6]Chung Tae-Woong&&Sato Haruo.Attenuation of high frequency P and S waves in the crust of southeastern Korea[J].Bull Seism Soc America,2001,91(6):1 867-1 874.
[7]王勤彩,陈章立,王中平,等云南地区散射衰减、吸收衰减及尾波衰减的综合研究[J],地球物理学进展,2010,25(2):419-431.
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[12]Aki,K.,Chouet,B..Origin of coda waves:source,attenuation,and scattering effects[J].J Geophys Res,1975,80(23):3 322-3 342.
[13]Sato H.Energy propagation including scattering effects single isotropic scattering approximation[J].J Geophys Res,1977,25:27-41.
[14]王筱荣.新疆南天山部分地区尾波衰减特征,内陆地震[J],1991,5(2):132-137.
[15]赵翠萍,夏爱国,郑斯华,等.新疆北天山中东段地区震源参数研究[J].中国地震,2005,21(1):61-68.
[16]姜慧,高孟潭,俞言祥,等.北天山地区S波非弹性衰减和场地效应研究[J].地震学报,2007,29(2):181-186.
[17]王勤彩,刘杰,郑斯华,等.云南地区与频率有关的P波、S波衰减研究[J].地震学报,2005,27(6):588-597.
[2]Yoshimoto K,Sato H,Yoshihisa,et a1.Frequency-Dependent Attenuation of P and S Waves In the Kanto Area,Japan,Based On the Coda-Normalization Method[J].Geophys J Int,1993.114(1):165-174.
[3]Atkinson G M,Mereu R F.The shape of ground motion attenuation curves in southeastern Canada[J].Bull Seism Soc America,1992,82(5):2 014-2 031.
[4]黄玉龙,郑斯华,刘杰,等.广东地区地震动衰减和场地响应的研究[J].地球物理学报,2003,46(1):54-61.
[5]刘杰,郑斯华,黄玉龙.利用遗传算法反演非弹性衰减系数、震源系数和场地响应[J].地震学报,2003,25(2):211-218.
[6]Chung Tae-Woong&&Sato Haruo.Attenuation of high frequency P and S waves in the crust of southeastern Korea[J].Bull Seism Soc America,2001,91(6):1 867-1 874.
[7]王勤彩,陈章立,王中平,等云南地区散射衰减、吸收衰减及尾波衰减的综合研究[J],地球物理学进展,2010,25(2):419-431.
[8]Singh D D.Q-structure beneath the north and central Indian Ocean from the inversion of observed Love and Rayleigh wave attenuation data[J].Phys Earth Planet Inter,1990,59(4):243-258.
[9]吴建平,曾融生.青藏高原Q值结构反演[J].地震学报,1996,16(2):208-214.
[10]Xie J,Nuttli O W.Interpretation of high-frequency coda at large distances:stochastic modelling and method of inversion[J].Geophys J Int,1988,95(2):579-595.
[11]Xie J,Mitchell B J.A back-projection method for imaging large-scale lateral variation of Lg coda Q with application to continental Africa[J].Geophys J Int,1990,100(2):161-181.
[12]Aki,K.,Chouet,B..Origin of coda waves:source,attenuation,and scattering effects[J].J Geophys Res,1975,80(23):3 322-3 342.
[13]Sato H.Energy propagation including scattering effects single isotropic scattering approximation[J].J Geophys Res,1977,25:27-41.
[14]王筱荣.新疆南天山部分地区尾波衰减特征,内陆地震[J],1991,5(2):132-137.
[15]赵翠萍,夏爱国,郑斯华,等.新疆北天山中东段地区震源参数研究[J].中国地震,2005,21(1):61-68.
[16]姜慧,高孟潭,俞言祥,等.北天山地区S波非弹性衰减和场地效应研究[J].地震学报,2007,29(2):181-186.
[17]王勤彩,刘杰,郑斯华,等.云南地区与频率有关的P波、S波衰减研究[J].地震学报,2005,27(6):588-597.
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