利用H-Kappa方法反演宁夏地区的地壳厚度
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摘要
利用宁夏区域数字地震台网记录到的远震提取接收函数,用H-Kappa叠加方法反演得到宁夏区域数字地震台网子台下方的地壳厚度和波速比。结果显示,宁夏地区地壳平均厚度约为46km,并且由西南向东北逐渐减薄,南北两端地壳厚度差异达15km,东西两端地壳厚度差异达8km。泊松比计算结果显示,宁夏北部和中南部的泊松比值较高,中北部泊松比值较低。
Receiver functions were calculated by using teleseismic records of Ningxia Digital Seismic Network,and crustal thickness in Ningxia area is obtained by stacking receiver functions with H-Kappa technique.The results reveal that the average crustal thickness in Ningxia is about 46 km,and the crust becomes thinner from Southwest to Northeast.The crust in the South is 15 km thicker than that in the North,while the one in the West is 8 km thicker than that in the East.The Poisson ratio in the North and the middle South has a higher value,while in the middle North it is relatively low.These results will be valuable for understanding the velocity structure and the contents of the crust in the Ningxia area.
Receiver functions were calculated by using teleseismic records of Ningxia Digital Seismic Network,and crustal thickness in Ningxia area is obtained by stacking receiver functions with H-Kappa technique.The results reveal that the average crustal thickness in Ningxia is about 46 km,and the crust becomes thinner from Southwest to Northeast.The crust in the South is 15 km thicker than that in the North,while the one in the West is 8 km thicker than that in the East.The Poisson ratio in the North and the middle South has a higher value,while in the middle North it is relatively low.These results will be valuable for understanding the velocity structure and the contents of the crust in the Ningxia area.
引文
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高星,王卫民,姚振兴.2005.中国及邻近地区地壳结构[J].地球物理学报,48(3):591-610.
李清河,郭守年,吕德徽.1999.鄂尔多斯西缘与西南缘深部结构与构造[M].北京:地震出版社.
罗艳,崇加军,倪四道,等.2008.首都圈地区莫霍面起伏及沉积层厚度[J].地球物理学报,51(4):1135-1145.
王小平,朱元清,于海英.2006.用远震接收函数反演上海及其邻区地壳速度结构[J].地震研究,29(3):239-244.
吴立辛.2005.利用重力资料探讨青藏块体东北缘地壳结构特征[D].合肥:中国科学技术大学.
夏静瑜,杨海燕,胡家富.2008.用接收函数叠加技术研究滇西上地幔间断面埋深[J].地震研究,31(3):244-249.
许卫卫,郑天愉.2005.渤海湾盆地北西盆山边界地区泊松比分布[J].地球物理学报,48(5):1077-1084.
杨明芝,马禾青,廖玉华.2007.宁夏地震活动与研究[M].北京:地震出版社.
中国地震局.1986.中国地壳上地幔地球物理勘探成果[M].北京:地震出版社.
L a ngston C A.1977.The effect of planar dipping structure on source andreceiver responses for constant ray parameter[J].BSSA,67:1029-1050.
L an gston C A.1979.Structure under mountrainier,Washington,inferredfrom teleseismic body waves[J].JGR,84:4749-4762.
O w ens TJ,Zandt G,Taylor S R.1984.Seismic evidence for an ancient riftbeneath the Cumberland Plateau,Tennessee:A detailed analysis ofbroadband teleseismic P wave forms[J].JGR,89:7783-7795.
P h inney.1964.Structure of the Earth s crust from spectral behavior oflong-period body waves[J].JGR,69:2997-3017.
W i ggins R A,Helmberger D V.1973.Upper mantle structure of the west-ern United States.[J].JGR,78(11):1870-1880.
Z an dt G,Ammon C J.1995.Continental crust composition constrained bymeasurements of crustal Poisson s ratio[J].Nature,374:152-154.
Z h u L P.2000.Moho depth variation in southern California from teleseis-mic receiver functions[J].JGR,105(B2):2969-2980.
Z h u L P,Owens TJ,Randall G E.1995.Lateral variation in crustal struc-ture of the northern Tibetan Plateau inferred fromteleseismic receiverfunction[J].BSSA,85:1531-1540.
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