利用远震接收函数研究辽宁地区的地壳厚度及泊松比
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摘要
文中利用辽宁省数字地震遥测台网15个台站记录的远震P波波形资料,用频率域反褶积方法提取接收函数,由H-Kappa叠加方法得到了各台站下方的地壳厚度和泊松比。研究结果表明,辽宁地区的地壳泊松比在0.25～0.29之间,地壳厚度介于31～36km之间,东部褶隆带的地壳厚度从北向南由31km增至35km。松辽构造盆地地壳厚度变化不大,平均厚度为31km。辽西褶隆带与东部褶隆带的地壳厚度均比哈尔滨构造盆地厚约2～4km。
Songhuajiang-Liaohe Basin is surrounded by several folded mountains,with some major deep faults running across them.Among these faults,the Tanlu Fault is one of biggest active faults in the east China continent.This kind of geological environment makes Liaoning and its adjacent areas be capable of highly active tectonic movement and high seismicity.As crustal thickness and Poisson ratio are closely related to seismogenic structure,studying on these parameters will be very important for us to understand the seismogenic process of Liaoning and its neighboring regions.In this work,teleseismic P wave records from 15 permanent broadband seismic stations in Liaoning province are collected and processed by inverse convolution method in spectral domain to get the P wave receiver functions.The H-Kappa stacking method is further used to obtain the crustal thickness and Poisson ratio under each seismic station.The result shows that Poisson ratio in this region is between 0.25and 0.29,and crustal thickness ranges from 31km to 36km.Comparing with the Harbin Basin,the crustal thickness of the west and east fold belts in this region is about 2～4km thicker.The distribution pattern of crust thickness shows that the crust is getting thicker from east to west and from north to south,with an average crustal thickness about 31km in Songliao Basin.This pattern shows that the Songhuajiang-Liaohe Basin is a typical rift basin,its seismogenic process may mainly be controlled by the subsidence of the basin and the horizontal extension from the east and the west boundaries.
Songhuajiang-Liaohe Basin is surrounded by several folded mountains,with some major deep faults running across them.Among these faults,the Tanlu Fault is one of biggest active faults in the east China continent.This kind of geological environment makes Liaoning and its adjacent areas be capable of highly active tectonic movement and high seismicity.As crustal thickness and Poisson ratio are closely related to seismogenic structure,studying on these parameters will be very important for us to understand the seismogenic process of Liaoning and its neighboring regions.In this work,teleseismic P wave records from 15 permanent broadband seismic stations in Liaoning province are collected and processed by inverse convolution method in spectral domain to get the P wave receiver functions.The H-Kappa stacking method is further used to obtain the crustal thickness and Poisson ratio under each seismic station.The result shows that Poisson ratio in this region is between 0.25and 0.29,and crustal thickness ranges from 31km to 36km.Comparing with the Harbin Basin,the crustal thickness of the west and east fold belts in this region is about 2～4km thicker.The distribution pattern of crust thickness shows that the crust is getting thicker from east to west and from north to south,with an average crustal thickness about 31km in Songliao Basin.This pattern shows that the Songhuajiang-Liaohe Basin is a typical rift basin,its seismogenic process may mainly be controlled by the subsidence of the basin and the horizontal extension from the east and the west boundaries.
引文
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许卫卫,郑天愉.2002.接收函数方法及研究进展[J].地球物理学进展,17(4):605—613.XU Wei-wei,ZHENG Tian-yu.2002.The receiver function method and its progress[J].Progress in Geophysics,17(4):605—613(in Chinese).
钟以璋,卢造勋,刘天革,等.1979.东北地区地壳结构特征与地震分布[J].地震地质,1(2):13—21.ZHONG Yi-zhang,LU Zao-xun,LIUTian-ge,et al.1979.Crustal structure and distribution of earthquakes in NortheastChina[J].Seismology and Geology,1(2):13—21(in Chinese).
Christensen N I,Mooney W D.1995.Seismic velocity structure and composition of the continental crust:Aglobal view[J].J Geophys Res,100:9761—9788.
Watanabe T.1993.Efects of water and melt on seismic velocities and their application to characterization of seismic re-flectors[J].Ceophy Res Lett,20:2933—2936.
Yuan X,Ni J,Kind R,et al.1997.Lithospheric and upper mantle structure of southern Tibet from a seismological pas-sive source experiment[J].J Geophys Res,102:27491—27500.
Zhu H,Kanamori H.2000.Moho depth variation in southern California from teleseimic receiver functions[J].J Geo-phys Res,105:2969—2980.
李永华,吴庆举,田小波,等.2009.用接收函数方法研究云南及其邻区地壳上地幔结构[J].地球物理学报,52(1):67—80.LI Yong-hua,WU Qing-ju,TIAN Xiao-bo,et al.2009.Crustal structure in the Yunnan region determined by modelingreceiver functions[J].Chinese Journal of Geophysics,52(1):67—8O(in Chinese).
刘启元,Kind R,李顺成.1997a.中国数字地震台网的接收函数及其非线性反演[J].地球物理学报,40(3):336—368.LIU Qi-yuan,Kind R,LI Shun-cheng.1997a.The receiver functions at the stations of the Chinese digital seismic net-work(CDSN)and their nonlinear inversion[J].Chinese Journal of Geophysics,40(3):336—368(in Chinese).
刘启元,李顺成,沈杨,等.1997b.延怀盆地及其邻区地壳上地幔速度结构的宽频带地震台阵研究[J].地球物理学报,40(6):763—772.LIUQi-yuan,LI Shun-cheng,SHEN Yang,et al.1997b.Broadband seismic array study of the crust and upper mantlevelocity structure beneath Yanhuai Basin and its neighboring region[J].Chinese Journal of Geophysics,40(6):763—772(in Chinese).
卢群,殷为民,刘淑芹,等.2004.辽宁省地震监测志[M].北京:地震出版社.LU Qun,YIN Wei-min,LIUShu-qin,et al.2004.Seismic Monitoring Records of Liaoning Province[M].SeismologicalPress,Beijing(in Chinese).
卢造勋,蒋秀琴,白云,等.1999.胶辽渤海地区地壳上地幔结构特征与介质的横向非均匀性[J].华北地震科学,17(2):43—51.LU Zao-xun,JIANG Xiu-qin,BAI Yun,et al.1999.Structural characteristics of crust and upper mantle and inhomogene-ity of the medium in Jiaoliao and Bohai regions[J].North China Earthquake Sciences,17(2):43—51(in Chi-nese).
卢造勋.1983.东北地区的深部构造与地震[J].长江地质学院学报,(1):113—121.LUZao-xun.1983.Deep structure and earthquake in northeast China region[J].Journal of Geological Institute of theYangtze River,(1):113—121(in Chinese).
潘科,蒋秀琴,卢造勋,等.2001.辽宁及邻区地壳上地幔三维速度的地震成析成像[J].地震地磁观测,22(2):92—98.PAN Ke,JIANG Xiu-qin,LUZao-xun,et al.2001.Three-dimension velocity image of the crust and upper mantle in Lia-oning and its neighbor regions[J].Seismological and Geomagnetic Observation and Research,22(2):92—98(in Chinese).
王俊,刘启元,陈九辉,等.2009.首都圈地区的地壳厚度及泊松比[J].地球物理学报,52(1):57—66.WANG Jun,LIU Qi-yuan,CHEN Jiu-hui,et al.2009.The crustal thickness and Poisson s ratio beneath the Capital Cir-cle Region[J].Chinese Journal of Geophysics,52(1):57—66(in Chinese).
王小平,宋秀清,秦浩文.2005.接收函数方法应用的现状及其发展[J].地球物理学进展,20(2):545—549.WANG Xiao-ping,SONG Xiu-qing,QINHao-wen.2005.The development and status of the receiver function application[J].Progress in Geophysics,20(2):545—549(in Chinese).
许卫卫,郑天愉.2002.接收函数方法及研究进展[J].地球物理学进展,17(4):605—613.XU Wei-wei,ZHENG Tian-yu.2002.The receiver function method and its progress[J].Progress in Geophysics,17(4):605—613(in Chinese).
钟以璋,卢造勋,刘天革,等.1979.东北地区地壳结构特征与地震分布[J].地震地质,1(2):13—21.ZHONG Yi-zhang,LU Zao-xun,LIUTian-ge,et al.1979.Crustal structure and distribution of earthquakes in NortheastChina[J].Seismology and Geology,1(2):13—21(in Chinese).
Christensen N I,Mooney W D.1995.Seismic velocity structure and composition of the continental crust:Aglobal view[J].J Geophys Res,100:9761—9788.
Watanabe T.1993.Efects of water and melt on seismic velocities and their application to characterization of seismic re-flectors[J].Ceophy Res Lett,20:2933—2936.
Yuan X,Ni J,Kind R,et al.1997.Lithospheric and upper mantle structure of southern Tibet from a seismological pas-sive source experiment[J].J Geophys Res,102:27491—27500.
Zhu H,Kanamori H.2000.Moho depth variation in southern California from teleseimic receiver functions[J].J Geo-phys Res,105:2969—2980.
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