利用远震接收函数反演重庆地震台下方的速度结构
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摘要
选取重庆地震台2010年至2012年记录的60个远震宽频带数字地震记录,采用频率域反褶积法获得台站的接收函数,采用H-Kappa叠加方法反演台站下方的地壳厚度和泊松比,作为台站下方波速反演的约束条件,以减少反演的非唯一性。计算结果显示,重庆地震台下方地壳厚度为42 km,与中国大陆中西部地区Moho面深度在38—45 km保持一致。该研究对增强该区的深部地质构造特征、分析孕震机制等具有积极意义。
On basis of 60 teleseismic broadband digital seismic records from 2010 to 2012 recorded by Chongqing Seismic Station,frequency deconvolution method is used to calculate receiver functions and H-Kappa stacking method is adopted to inverse the thickness and Poisson ratio in crust of this area.Then the crustal thickness inversed by H-Kappa stacking method is used as a constraint for velocity inversion beneath the seismic network in order to reduce inversion non-uniqueness.The result shows that the crustal thickness beneath Chongqing Seismic Station is about 42 km.This is consistent with the Moho depth(between 38 km and45 km) in the central and western regions in China.It has a positive meaning for enhancing this area's characteristics of deep geological structure,earthquake nucleate analysis,and so on.
On basis of 60 teleseismic broadband digital seismic records from 2010 to 2012 recorded by Chongqing Seismic Station,frequency deconvolution method is used to calculate receiver functions and H-Kappa stacking method is adopted to inverse the thickness and Poisson ratio in crust of this area.Then the crustal thickness inversed by H-Kappa stacking method is used as a constraint for velocity inversion beneath the seismic network in order to reduce inversion non-uniqueness.The result shows that the crustal thickness beneath Chongqing Seismic Station is about 42 km.This is consistent with the Moho depth(between 38 km and45 km) in the central and western regions in China.It has a positive meaning for enhancing this area's characteristics of deep geological structure,earthquake nucleate analysis,and so on.
引文
丁仁杰,李克昌,等.重庆地震研究[M].北京:地震出版社,2004.
段永红,张先康,刘志,等.长白山—镜泊湖火山区地壳结构接收函数研究[J].地球物理学报,2005,48(2):352-3 58.
贺传松,王椿镛,吴庆举.接收函数方法及其新的进展[J].地球物理学进展,2003,18(2):224-228.
胡建平,赵军龙,汪文秉.三峡重庆库区深部二维构造剖面的建立和分析[J].地震研究,2005,28(1):71-77.
李永华,吴庆举,安张辉,等.青藏高原东北缘地壳S波速度结构与泊松比及其意义[J].地球物理学报,2006,49(5):1 359-1 368.
刘春,崇加军,倪四道,等.利用远震接收函数反演陕西地震台站下方的地壳厚度[J].地震地质,2009,31(2):313-320.
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王峻,刘启元,陈九辉,等.根据接收函数反演得到的首都圈地壳上地幔三维S波速度结构[J].地球物理学报,2009,(10):2 472-2 482.
王小龙,马胜利,雷兴林,等.2011.重庆荣昌地区注水诱发地震加密观测[J].地震地质,33(1):1 51-156.
王小龙,倪四道,刘渊源,等.2010.利用远震接收函数分析三峡库区重庆段地壳厚度变化[J].地震地质,32(4):543-551.
王小平.朱元清,于海英.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,2006,29(3);239-244.
吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构[J].地球物理学报,1998(5):669-679.
许卫卫,郑天愉.接收函数方法及研究进展[J].地球物理学进展.2002,17(4):605-613.
Christensen N I,Fountain D M.Constitution of the lower continental crust based on experim ental studies of seismic velocities in granulite.Geol Soc Am Bull,1975,86,462—465.
Fountain D M,Christensen N I.Composotion of the continental crust and upper mantle,a review in geophysica fram ework of the continental United States.Mere Geol Soc Am,1989,172,711—742.
Hsiao Lan Wang,Lupei Zhu.Moho depth variation inTaiwan from teleseismic receiver functions[J].Asian Earth Sciences,2009.
Lei Xinglin,Yu Guozheng,Ma Shengli,et al.2008.Earthquakes induced by water injection at—3 km depth within the Rongchang gas field,Chongqing,China[J].Journal of Geophysical Research,113,B10310.
Lp Z H K.Moho depth variation in southern California from teleseismic receiver functions[J].Journal of Geophysical Research,2000,105(B2),2 969-2 980.
段永红,张先康,刘志,等.长白山—镜泊湖火山区地壳结构接收函数研究[J].地球物理学报,2005,48(2):352-3 58.
贺传松,王椿镛,吴庆举.接收函数方法及其新的进展[J].地球物理学进展,2003,18(2):224-228.
胡建平,赵军龙,汪文秉.三峡重庆库区深部二维构造剖面的建立和分析[J].地震研究,2005,28(1):71-77.
李永华,吴庆举,安张辉,等.青藏高原东北缘地壳S波速度结构与泊松比及其意义[J].地球物理学报,2006,49(5):1 359-1 368.
刘春,崇加军,倪四道,等.利用远震接收函数反演陕西地震台站下方的地壳厚度[J].地震地质,2009,31(2):313-320.
刘启元,Rainerkind,李顺成.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,1997,(3):356-368.
田宝峰,李娟,王卫民,等.华北太行山区地壳各向异性的接收函数证据[J].地球物理学报,2008,51(5):1 459-1 467.
王椿镛,楼海,姚志祥,等.龙门山及其邻区的地壳厚度和泊松比[J].第四纪研究,2010,30(4):652-661.
王峻,刘启元,陈九辉,等.根据接收函数反演得到的首都圈地壳上地幔三维S波速度结构[J].地球物理学报,2009,(10):2 472-2 482.
王小龙,马胜利,雷兴林,等.2011.重庆荣昌地区注水诱发地震加密观测[J].地震地质,33(1):1 51-156.
王小龙,倪四道,刘渊源,等.2010.利用远震接收函数分析三峡库区重庆段地壳厚度变化[J].地震地质,32(4):543-551.
王小平.朱元清,于海英.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,2006,29(3);239-244.
吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构[J].地球物理学报,1998(5):669-679.
许卫卫,郑天愉.接收函数方法及研究进展[J].地球物理学进展.2002,17(4):605-613.
Christensen N I,Fountain D M.Constitution of the lower continental crust based on experim ental studies of seismic velocities in granulite.Geol Soc Am Bull,1975,86,462—465.
Fountain D M,Christensen N I.Composotion of the continental crust and upper mantle,a review in geophysica fram ework of the continental United States.Mere Geol Soc Am,1989,172,711—742.
Hsiao Lan Wang,Lupei Zhu.Moho depth variation inTaiwan from teleseismic receiver functions[J].Asian Earth Sciences,2009.
Lei Xinglin,Yu Guozheng,Ma Shengli,et al.2008.Earthquakes induced by water injection at—3 km depth within the Rongchang gas field,Chongqing,China[J].Journal of Geophysical Research,113,B10310.
Lp Z H K.Moho depth variation in southern California from teleseismic receiver functions[J].Journal of Geophysical Research,2000,105(B2),2 969-2 980.
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