相位加权叠加方法在探测鄂尔多斯东南缘地壳结构中的应用
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摘要
本文利用在鄂尔多斯东南缘地区宽频带流动地震台阵记录的远震数据,提取各台站的接收函数,并利用相位加权方法进行单台多震叠加、H-κ叠加以及共转换点叠加,获得了研究区莫霍过渡带的深度及其变化趋势。研究结果显示,莫霍的深度由鄂尔多斯块体往东南方向逐渐变浅,在不同区域莫霍具有不同的特征:鄂尔多斯的莫霍深度在42～38km;渭河—山西地堑的莫霍出现约3km的上隆;熊耳—伏牛山的莫霍深度在35～33km;河淮盆地的莫霍形态比较复杂。相位加权叠加方法能有效地压制相关性不好的噪音,在部分受噪音及沉积层多次波干扰的台站记录中,对突出莫霍的转换波Ps震相有很大的帮助。
In order to study the crustal structures in the southeastern margin of the Ordos Block,a portable broadband seismograph array with 22 stations was deployed in the study area. Instead of the linear stacking,a non-linear stacking technique named the phase-weighted stack(PWS) was used to stack the radial receiver functions for each station. The results show that the depth of Moho in the study area gradually decreases towards the southeast. The Moho discontinuity in different parts of the study area exhibits different features:the depth of Moho in the Ordos block is between 42 and 38 km;the Moho in Weihe-Shanxi graben bulges up by about 3 km;In the Xionger-Funiu Mountains,the depth of Moho is betweem 35 and 33 km;the Moho in the Hehuai basin appears to be complex. To conclude,the PWS Method is useful to enhance the S/N(signal/noise) ratio and determine the depth of Moho beneath the stations in the study area.
In order to study the crustal structures in the southeastern margin of the Ordos Block,a portable broadband seismograph array with 22 stations was deployed in the study area. Instead of the linear stacking,a non-linear stacking technique named the phase-weighted stack(PWS) was used to stack the radial receiver functions for each station. The results show that the depth of Moho in the study area gradually decreases towards the southeast. The Moho discontinuity in different parts of the study area exhibits different features:the depth of Moho in the Ordos block is between 42 and 38 km;the Moho in Weihe-Shanxi graben bulges up by about 3 km;In the Xionger-Funiu Mountains,the depth of Moho is betweem 35 and 33 km;the Moho in the Hehuai basin appears to be complex. To conclude,the PWS Method is useful to enhance the S/N(signal/noise) ratio and determine the depth of Moho beneath the stations in the study area.
引文
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611-620.
邱瑞照,邓晋福,周肃,等.2003.华北地区岩石圈类型:地质与地球物理证据[J].中国科学(D辑),34(8):698-711.
唐有彩,冯永革,陈永顺,等.2010.山西断陷带地壳结构的接收函数研究[J].地球物理学报,53(9):2102-2109.
吴福元,徐义刚,高山,等.2008.华北岩石圈减薄与克拉通破坏研究的主要学术争论[J].岩石学报,24(6):1145-1174.
吴庆举,田小波,张乃玲,等.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382-389.
徐汉林,赵宗举,杨以宁,等.2003.南华北盆地构造格局及构造样式[J].地球学报,24(1):27-33.
杨明慧,王嗣敏,郑晓凤,等.2009.华北克拉通南部及邻区航磁异常特征及构造分区[J].地质论评,55(6):862-872.
张岳桥,马寅生,杨农.2003.太行山南缘断裂带新构造活动及其区域运动学意义[J].地震地质,25(2):169-182.
Huang W and Wu Z W.1992.Evolution of the Qinling orogenic belt[J].Tectonics,11(2):371-380.
Huang Z C,Xu M J,Wang L S,et al.2008.Shear wave splitting in the southern margin of the Ordos Block,north China[J].Geophysical Research Letters,35:L19301.
Jia Sh ixu and Zhang Xiankang.2005.Crustal structure and comparison of di fferent tectonic blocks in North China[J].Chinese Journal of Geophysics,48(3):611-620.(in Chinese with English abstract)
Lang ston C A.1979.Structure under Mount Rainier,Washington,inferred from teleseismic body waves[J].Journal of Geophysical Research,84:4749-4762.
Qiu Ruizhao,Deng Jinfu,Zhou Su,et al.2003.Lithosphere types in North China:Evidence from geology and geophysics[J].Science in China Ser.D Earth Sciences,34(8):698-711.(in Chinese)
Schim mel M and Paulssen H.1997.Noise reduction and detection of weak,coherent signals through phase-weighted stacks[J].Geophysical Journal International,130:497-505.
Tang Youcai,Feng Yongge,Chen Yongshun,et al.2010.Receiver function analysis at Shanxi rift[J].Chinese Journal of Geophysics,53(9):2102-2109.(in Chinese with English abstract)
Wu Fu yuan,Xu Yigang,Gaoshan,et al.2008.Lithospheric thinning and destruction of the north China Craton[J].Acta Petrologica Sininca,24(6):1145-1174.(in Chinese with English abstract)
Wu Qi ngju,Tian Xiaobo,Zhang Nailing,et al.2003.Receiver function estimated by maximum entropy deconvolution[J].Acta Seismology Sinica,25(4):382-389.(in Chinese with English abstract)
Xu Ha nlin,Zhao Zongju,Yang Yining,et al.2003.Structural pattern and structural style of the southern North China Basin[J].Acta Seismology Sinica,24(1):27-33.(in Chinese with English abstract)
Yang Minghui,Wang Simin,Zheng Xiaofeng,et al.2009.Aeromagnetic anomalies characteristics and tectonic subareas of southern North China Craton and adjacent regions[J].Geological Review,55(6):862-872.(in Chinese with English abstract)
Yuan X H,Ni J,Kind R,et al.1997.Lithospheric and upper mantle structure of southern Tibet from a seismologiacl passive source experiment[J].Journal of Geophysical Research,102(B12):27491-27500.
Zhang Yueqiao,Ma Yinsheng and Yang Nong.2003.Neotectonic activity of the southern marginal fault zone of the Taihangshan Mountains and its regional kinematic implications[J].Seismology and Geology,25(2):169-182.(in Chinese with English abstract)
Zhu L P and Kanamori H.2000.Moho depth variation in southern California from teleseismic receiver functions[J].Journal of Geophysical Research,105:2969-2980.
邱瑞照,邓晋福,周肃,等.2003.华北地区岩石圈类型:地质与地球物理证据[J].中国科学(D辑),34(8):698-711.
唐有彩,冯永革,陈永顺,等.2010.山西断陷带地壳结构的接收函数研究[J].地球物理学报,53(9):2102-2109.
吴福元,徐义刚,高山,等.2008.华北岩石圈减薄与克拉通破坏研究的主要学术争论[J].岩石学报,24(6):1145-1174.
吴庆举,田小波,张乃玲,等.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382-389.
徐汉林,赵宗举,杨以宁,等.2003.南华北盆地构造格局及构造样式[J].地球学报,24(1):27-33.
杨明慧,王嗣敏,郑晓凤,等.2009.华北克拉通南部及邻区航磁异常特征及构造分区[J].地质论评,55(6):862-872.
张岳桥,马寅生,杨农.2003.太行山南缘断裂带新构造活动及其区域运动学意义[J].地震地质,25(2):169-182.
Huang W and Wu Z W.1992.Evolution of the Qinling orogenic belt[J].Tectonics,11(2):371-380.
Huang Z C,Xu M J,Wang L S,et al.2008.Shear wave splitting in the southern margin of the Ordos Block,north China[J].Geophysical Research Letters,35:L19301.
Jia Sh ixu and Zhang Xiankang.2005.Crustal structure and comparison of di fferent tectonic blocks in North China[J].Chinese Journal of Geophysics,48(3):611-620.(in Chinese with English abstract)
Lang ston C A.1979.Structure under Mount Rainier,Washington,inferred from teleseismic body waves[J].Journal of Geophysical Research,84:4749-4762.
Qiu Ruizhao,Deng Jinfu,Zhou Su,et al.2003.Lithosphere types in North China:Evidence from geology and geophysics[J].Science in China Ser.D Earth Sciences,34(8):698-711.(in Chinese)
Schim mel M and Paulssen H.1997.Noise reduction and detection of weak,coherent signals through phase-weighted stacks[J].Geophysical Journal International,130:497-505.
Tang Youcai,Feng Yongge,Chen Yongshun,et al.2010.Receiver function analysis at Shanxi rift[J].Chinese Journal of Geophysics,53(9):2102-2109.(in Chinese with English abstract)
Wu Fu yuan,Xu Yigang,Gaoshan,et al.2008.Lithospheric thinning and destruction of the north China Craton[J].Acta Petrologica Sininca,24(6):1145-1174.(in Chinese with English abstract)
Wu Qi ngju,Tian Xiaobo,Zhang Nailing,et al.2003.Receiver function estimated by maximum entropy deconvolution[J].Acta Seismology Sinica,25(4):382-389.(in Chinese with English abstract)
Xu Ha nlin,Zhao Zongju,Yang Yining,et al.2003.Structural pattern and structural style of the southern North China Basin[J].Acta Seismology Sinica,24(1):27-33.(in Chinese with English abstract)
Yang Minghui,Wang Simin,Zheng Xiaofeng,et al.2009.Aeromagnetic anomalies characteristics and tectonic subareas of southern North China Craton and adjacent regions[J].Geological Review,55(6):862-872.(in Chinese with English abstract)
Yuan X H,Ni J,Kind R,et al.1997.Lithospheric and upper mantle structure of southern Tibet from a seismologiacl passive source experiment[J].Journal of Geophysical Research,102(B12):27491-27500.
Zhang Yueqiao,Ma Yinsheng and Yang Nong.2003.Neotectonic activity of the southern marginal fault zone of the Taihangshan Mountains and its regional kinematic implications[J].Seismology and Geology,25(2):169-182.(in Chinese with English abstract)
Zhu L P and Kanamori H.2000.Moho depth variation in southern California from teleseismic receiver functions[J].Journal of Geophysical Research,105:2969-2980.
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