用接收函数研究川滇地区国家地震台下地壳厚度及波速比
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摘要
本文利用远震接收函数的方法,对川滇地区的昆明、腾冲、成都和攀枝花等4个国家地震台的台基下方不同方向的莫霍面深度及波速比进行了研究和分析。结果表明:昆明地震台台基下方的莫霍面深度基本在50km左右,波速比为1.62～1.69,地壳厚度和波速比不因方向不同而发生明显的变化;腾冲地震台台基下方的地壳厚度有着比较明显的方向性,东北方向厚为40.7km,东南方向为49.7km,两个方向的波速比相差也很大,差值达到0.2;成都地震台台基下方莫霍面的深度在40km左右,但是东北和西南方向要加深8km,两个方向波速比相差0.13;攀枝花地震台台基下方的地壳厚度比较稳定,厚度在60km左右,波速比变化也不明显。
Teleseismic receiver function method is used in this paper to research on the Moho depths and v_p/v_s ratios of the 4 National seismic stations(KMI,TNC,CD2 and PZH)in the Chuandian(Sichuan-Yunnan)area.The study gives the Moho depths and velocity ratios of the four stations in different directions.The results show that,the Moho depth beneath the Kunming Station is around 50km,and the velocity ratio is between 1.62 and 1.69.The thickness of crust and the velocity ratio do not change with the direction.The Moho depths of Tengchong Station is of directivity with 40.7km in northeast,and 49.7 in southeast.The difference of the v_p/v_s values is remarkable between the two directions,which reaches 0.2.Chengdu Station also has shallow Moho depths,which is about 40km,but in the northeast and southwest it is 8km deeper.The velocity ratio has 0.13 difference.The thickness of crust beneath the Panzhihua Station is stable.In all directions,the Moho depth is around 60km and the v_p/v_s values also don't have much difference.
Teleseismic receiver function method is used in this paper to research on the Moho depths and v_p/v_s ratios of the 4 National seismic stations(KMI,TNC,CD2 and PZH)in the Chuandian(Sichuan-Yunnan)area.The study gives the Moho depths and velocity ratios of the four stations in different directions.The results show that,the Moho depth beneath the Kunming Station is around 50km,and the velocity ratio is between 1.62 and 1.69.The thickness of crust and the velocity ratio do not change with the direction.The Moho depths of Tengchong Station is of directivity with 40.7km in northeast,and 49.7 in southeast.The difference of the v_p/v_s values is remarkable between the two directions,which reaches 0.2.Chengdu Station also has shallow Moho depths,which is about 40km,but in the northeast and southwest it is 8km deeper.The velocity ratio has 0.13 difference.The thickness of crust beneath the Panzhihua Station is stable.In all directions,the Moho depth is around 60km and the v_p/v_s values also don't have much difference.
引文
陈培善、刘福田、李强等,1990,云南地区速度结构的横向不均匀性,中国科学(B辑),20(4),431～438。
何正勤、叶太兰、苏伟,2004,云南地区地壳上部横波速度结构研究,地球物理学报,47(5),838～844。
刘建华、刘福田、吴华等,1989,中国南北带地壳和上地幔的三维速度图像,地球物理学报,32(2),143～151。
刘启元、Kind,R,1997,中国数字地震台网的接收函数及其非线性反演.,地球物理学报,40(3),356～368。
刘瑞丰、陈培善、李强等,1993,云南及其临近地区三维速度图像,地震学报,15(1),61～67。
秦嘉政、皇甫岗、李强等,2000,腾冲火山及邻区速度结构的三维层析成像,地震研究,23(2),157～136。
熊邵柏、藤吉文、尹周勋等,1986,攀西构造带南部地壳上地幔结构的爆炸地震研究,地球物理学报,29(3),235～244。
吴建平、明跃红、王椿镛,2001,云南数字地震台下方的S波速度结构研究,地球物理学报,44(2),228～237。
吴建平、明跃红、王椿镛,2006,川滇地区速度结构的区域地震波形反演研究,地球物理学报,49(5),1369～1376。
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669～679。
吴庆举、田小波等,2003a计算台站接收函数的最大熵谱反褶积方法,地震学报,25(4),382～389。
吴庆举、田小波等,2003b用小波变换方法反演接收函数,地震学报,25(6),601～607。
吴庆举、李永华、张瑞青等,2007a,接收函数的克希霍夫2D偏移方法,地球物理学报,50(2),539～54。
吴庆举、李永华、张瑞青等,2007b,用多道反褶积方法测定台站接收函数,地球物理学报,50(3),791～796。
Kind R.,Kosarev G.L.,Petersen N.V.,1995,Receiver functions at the stations of the German Regional Seismic Network(GRSN).Geophys J Int.,121,191～202.
Langston C.A.,1979,Structure under Mount Rainer,Washington,inferredfromteleseismic body waves.J.Geophys.Res.,84(B9),4749～4762.
Ma Y.L.,Zhou H.L.,2007,Crustal thicknesses and Poisson s ratios in China by joint analysis of teleseismic receiver function andRayleigh wave dispersion.Geophys.R.L.,34,L12304.
Owens T.J.,Zandat G.,Taylot S R.,1984,Seismic evidencefor an ancient rift beneaththe Cumberland Plateau,Tennessee:Adetailedanalysis of broadbandteleseismic P waveforn.J Geophys Res.,89(B9),7783～7795.
Owens.T.J.,1987,Crustal structure at regional seismic test Network stations determined frominversion of broadband teleseismic Pwaveforms.Bull SeismSoc Amer,77,631～662
Se¨bastien Chevrot,Robert D.,2000,The Poisson ratio of the Australian crust:geological and geophysical implications.Earth Planet.Sci.,183,121～132.
Zhu L.P.,Kanamori H.,2000,Moho depth variationin southern California fromteleseismic receiver functions.J.Geophys.Res.,105(B2),2969～2980.
何正勤、叶太兰、苏伟,2004,云南地区地壳上部横波速度结构研究,地球物理学报,47(5),838～844。
刘建华、刘福田、吴华等,1989,中国南北带地壳和上地幔的三维速度图像,地球物理学报,32(2),143～151。
刘启元、Kind,R,1997,中国数字地震台网的接收函数及其非线性反演.,地球物理学报,40(3),356～368。
刘瑞丰、陈培善、李强等,1993,云南及其临近地区三维速度图像,地震学报,15(1),61～67。
秦嘉政、皇甫岗、李强等,2000,腾冲火山及邻区速度结构的三维层析成像,地震研究,23(2),157～136。
熊邵柏、藤吉文、尹周勋等,1986,攀西构造带南部地壳上地幔结构的爆炸地震研究,地球物理学报,29(3),235～244。
吴建平、明跃红、王椿镛,2001,云南数字地震台下方的S波速度结构研究,地球物理学报,44(2),228～237。
吴建平、明跃红、王椿镛,2006,川滇地区速度结构的区域地震波形反演研究,地球物理学报,49(5),1369～1376。
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669～679。
吴庆举、田小波等,2003a计算台站接收函数的最大熵谱反褶积方法,地震学报,25(4),382～389。
吴庆举、田小波等,2003b用小波变换方法反演接收函数,地震学报,25(6),601～607。
吴庆举、李永华、张瑞青等,2007a,接收函数的克希霍夫2D偏移方法,地球物理学报,50(2),539～54。
吴庆举、李永华、张瑞青等,2007b,用多道反褶积方法测定台站接收函数,地球物理学报,50(3),791～796。
Kind R.,Kosarev G.L.,Petersen N.V.,1995,Receiver functions at the stations of the German Regional Seismic Network(GRSN).Geophys J Int.,121,191～202.
Langston C.A.,1979,Structure under Mount Rainer,Washington,inferredfromteleseismic body waves.J.Geophys.Res.,84(B9),4749～4762.
Ma Y.L.,Zhou H.L.,2007,Crustal thicknesses and Poisson s ratios in China by joint analysis of teleseismic receiver function andRayleigh wave dispersion.Geophys.R.L.,34,L12304.
Owens T.J.,Zandat G.,Taylot S R.,1984,Seismic evidencefor an ancient rift beneaththe Cumberland Plateau,Tennessee:Adetailedanalysis of broadbandteleseismic P waveforn.J Geophys Res.,89(B9),7783～7795.
Owens.T.J.,1987,Crustal structure at regional seismic test Network stations determined frominversion of broadband teleseismic Pwaveforms.Bull SeismSoc Amer,77,631～662
Se¨bastien Chevrot,Robert D.,2000,The Poisson ratio of the Australian crust:geological and geophysical implications.Earth Planet.Sci.,183,121～132.
Zhu L.P.,Kanamori H.,2000,Moho depth variationin southern California fromteleseismic receiver functions.J.Geophys.Res.,105(B2),2969～2980.
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