新疆地区环境噪声层析成像研究
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摘要
本文利用北京大学宽频带流动地震台阵和新疆地震监测台网12个月连续地震记录数据,采用环境噪声层析成像方法获得了新疆地区的周期从10～35 s范围内的瑞利面波相速度异常分布图像.研究结果与地表地质构造相一致,新疆地区的天山、两盆大地构造与瑞利面波相速度异常有较好的对应关系.短周期10～20 s的图像显示两个盆地内都呈现低速异常,对应盆地较厚的沉积层.中长周期25～35 s的层析成像结果显示东西天山地区存在明显异常差异.本文获得的新疆地区地壳和上地幔相速度结果,也为进一步结合传统天然地震面波成像方法,最终获得新疆地区的三维剪切波速度结构奠定基础.
Using continuous data from Peking University Yutian broadband seismic array and Xinjiang seismic monitoring network,we have obtained phase velocity maps of Rayleigh wave in Xinjiang area between periods 10～35 s from ambient noise.The results correlate well with the surface geological features,such as the Tien Shan,Tarim Basin and Junggar Basin are well depicted by the Rayleigh wave phase velocity anomalies.The phase velocity maps at 10～20 s show comparatively low velocity anomalies in Tarim Basin and Junggar Basin,corresponding to the thick sediments.From intermediate periods to long periods,25～35 s,the phase velocity maps manifest clear differences in the Eastern and Western Tien Shan area.We obtained the crust and upper mantle Rayleigh phase velocity maps of Xinjiang area.By combining the traditional surface wave methods,this research would be a good foundation to reveal the 3D shear wave structure of this area.
Using continuous data from Peking University Yutian broadband seismic array and Xinjiang seismic monitoring network,we have obtained phase velocity maps of Rayleigh wave in Xinjiang area between periods 10～35 s from ambient noise.The results correlate well with the surface geological features,such as the Tien Shan,Tarim Basin and Junggar Basin are well depicted by the Rayleigh wave phase velocity anomalies.The phase velocity maps at 10～20 s show comparatively low velocity anomalies in Tarim Basin and Junggar Basin,corresponding to the thick sediments.From intermediate periods to long periods,25～35 s,the phase velocity maps manifest clear differences in the Eastern and Western Tien Shan area.We obtained the crust and upper mantle Rayleigh phase velocity maps of Xinjiang area.By combining the traditional surface wave methods,this research would be a good foundation to reveal the 3D shear wave structure of this area.
引文
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[13] Lin F C,Moschetti M P,Ritzwoller M H.Surfa ce wave tomography of the western United States from ambient seismic noise:Rayleigh and Love wave phase velocity maps.Geophys.J.Int.,2008,173(1) :281-298,DOI:10． 1111/J1365246X.2008． 03720． x
[14] Bensen G D,Ritzwoller M H,Barmin M P,et al.Processing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements.Geophys.J.Int.,2007,169(3) :1239-1260
[15] 张培震,邓起东,张国民等.中国大陆的强震活动与活动地块.中国科学(D辑),2003,33(增):12～20 Zhang P Z,Deng Q D,Zhang G M,et al.Active tectonic blocks and strong earthquakes in the continent of China.Seience in China (Series D) (in Chinese),2003,33 (Suppl.) :12～20
[16] Barmin M P,Ritzwoller M H,Levshin A L.A fast and
[17] Saito M.DISPER80:A subroutine package for the calculation of seismic normal-mode solutions.In:Doornbos D J ed.Seismological Algorithms;Computational Methods and Computer Programs.London.-Academic Press,1988． 293～319
[18] Zheng X F,Jiao W J,Zhang C H,et al.Short-period Rayleigh-wave group velocity tomography through ambient noise cross-correlation in Xinjiang,Northwest China.Bulletin of the Seismological Society of America ,2010,100(3) :1350~1355,DOI:10． 1785/0120090225
[19] 李昱,刘启元,陈九辉等.天山地壳上地幔的S波速度结构.中国科学(D辑),2007,37(3) :344～352 Li Y,Liu Q Y,Chen J H,et al.The Swave velocity structure of the crust and upper mantle underneath the Chinese Tianshan,Scienee in China (Series D) (in Chinese),2007,37(3) :344～352
[20] 郭飚,刘启元,陈九辉等.中国境内天山地壳上地幔结构的地震层析成像.地球物理学报,2006,49(6) :1693～1700 Guo B,Liu Q Y,Chen J H,et al.Seismic tomography of the crust and upper mantle structure underneath the Chinese Tianshan.Chinese J.Geophys.(in Chinese),2006,49(6) :1693～1700
[21] Liang C T,Song X D,Huang J L.Tomographic inversion of Pn travel times in China.J.Geophys.Res.,2004,109:B11304,DOI:10． 1029/2003JB002789
[2] Campillo M.Phase and correlation in 'Random' seismic fields and the reconstruction of the Green function.Pure and Applied Geophysics ,2006． 163(2-3) :475~502
[3] Lobkis O I,Weaver R L.On the emergence of the Green's function in the correlations of a diffuse field.Journal of the Acoustical Society of America ,2001,110(6) :3011～3017
[4] Wapenaar K.Retrieving the elastodynamic Green s function of an arbitrary inhomogeneous medium by cross correlation.Physical Review Letters,2004,93(25) :254301,DOI,10． 1103/PhysRevLett.93． 254301
[5] Nakahara H.A systematic study of theoretical relations between spatial correlation and Green s function in one-,two-and three-dimensional random scalar wavefields.Geophys.J.Int.,2006,167(3) :1097～1105
[6] Campillo M,Paul A.Long-range correlations in the diffuse seismic coda.Science,2003,299(5606) :547～549
[7] Paul A,Campillo M,Margerin L,et al.Empirical synthesis of time-asymmetrical Green functions from the correlation of coda waves.J.Geophys.Res.,2005,110(B8) :B08302,DOI:10． 1029/2004JB003521
[8] Shapiro N M,Campillo M.Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise.Geophys.Res.Lett.,2004,31:L07614,DOI:10． 1029/2004GL019491
[9] Shapiro N M,Campillo M,Stehly L,et al.High-resolution surface-wave tomography from ambient seismic noise.Science,2005,307(5715) ,1615～1618
[10] Kang T S,Shin J S.Surface-wave tomography from ambient seismic noise of accelerograph networks in southern Korea.Geophys.Res .Lett.,2006,33 :L17303,DOI :10． 1029/ 2006GL027044
[11] Yang Y J,Ritzwoller M H,Levshin A L,et al.Ambient noise Rayleigh wave tomography across Europe.Geophys.J.Int.,2007,168(1) :259～274
[12] Zheng S H,Sun X L,Song X D,et al.Surface wave tomography of China from ambient seismic noise correlation.Geochem.Geophys.Geosyst.,2008,9:Q05020,DOI:10． 1029/2008GC001981
[13] Lin F C,Moschetti M P,Ritzwoller M H.Surfa ce wave tomography of the western United States from ambient seismic noise:Rayleigh and Love wave phase velocity maps.Geophys.J.Int.,2008,173(1) :281-298,DOI:10． 1111/J1365246X.2008． 03720． x
[14] Bensen G D,Ritzwoller M H,Barmin M P,et al.Processing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements.Geophys.J.Int.,2007,169(3) :1239-1260
[15] 张培震,邓起东,张国民等.中国大陆的强震活动与活动地块.中国科学(D辑),2003,33(增):12～20 Zhang P Z,Deng Q D,Zhang G M,et al.Active tectonic blocks and strong earthquakes in the continent of China.Seience in China (Series D) (in Chinese),2003,33 (Suppl.) :12～20
[16] Barmin M P,Ritzwoller M H,Levshin A L.A fast and
[17] Saito M.DISPER80:A subroutine package for the calculation of seismic normal-mode solutions.In:Doornbos D J ed.Seismological Algorithms;Computational Methods and Computer Programs.London.-Academic Press,1988． 293～319
[18] Zheng X F,Jiao W J,Zhang C H,et al.Short-period Rayleigh-wave group velocity tomography through ambient noise cross-correlation in Xinjiang,Northwest China.Bulletin of the Seismological Society of America ,2010,100(3) :1350~1355,DOI:10． 1785/0120090225
[19] 李昱,刘启元,陈九辉等.天山地壳上地幔的S波速度结构.中国科学(D辑),2007,37(3) :344～352 Li Y,Liu Q Y,Chen J H,et al.The Swave velocity structure of the crust and upper mantle underneath the Chinese Tianshan,Scienee in China (Series D) (in Chinese),2007,37(3) :344～352
[20] 郭飚,刘启元,陈九辉等.中国境内天山地壳上地幔结构的地震层析成像.地球物理学报,2006,49(6) :1693～1700 Guo B,Liu Q Y,Chen J H,et al.Seismic tomography of the crust and upper mantle structure underneath the Chinese Tianshan.Chinese J.Geophys.(in Chinese),2006,49(6) :1693～1700
[21] Liang C T,Song X D,Huang J L.Tomographic inversion of Pn travel times in China.J.Geophys.Res.,2004,109:B11304,DOI:10． 1029/2003JB002789
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