云南地区的背景弹性波场分析
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摘要
利用云南省地震台网44个台站记录的2008年1—9月连续波形数据进行互相关计算,得到了台站间的格林函数,并获取对应的频散曲线,据此分析了该地区的区域背景弹性波场的来源及分布.研究发现,该地区的区域背景弹性波场有着明显的方向性,15s信号的总体传播方向是从东南向西北,也就是说主要来自云南省的东南方向,据此推测区域背景弹性波场可能与中国南海或者南太平洋的海洋活动有关.另外该地区的区域背景弹性波场有着明显的季节性变化,其中6—9月份的能量较强.对比中国大陆风力分布发现,该信号与区域台站附近及台站间的风力没有明显关系.
Using 9 months waveform data recorded at 44 seismic stations of Yunnan seismic network during 2008,we obtained Green's functions between the stations with cross-correlation analysis,and then retrieved wave dispersion curves from the Green's functions.Using the Green's functions and dispersion curves,we analyzed the sources of the regional background weak signals.The Green's functions show that the background weak signals in a period of 15s propagated from southeast to northwest in the Yunnan province.The azimuthal variation of the signals implies that they may be related to the effect of oceanic waves in South China Sea or southern Pacific ocean.The background signals show a seasonal variation,with the strongest signals appeared between June and September in a year.Comparing the signals with wind data,we could not find any relation between them.
Using 9 months waveform data recorded at 44 seismic stations of Yunnan seismic network during 2008,we obtained Green's functions between the stations with cross-correlation analysis,and then retrieved wave dispersion curves from the Green's functions.Using the Green's functions and dispersion curves,we analyzed the sources of the regional background weak signals.The Green's functions show that the background weak signals in a period of 15s propagated from southeast to northwest in the Yunnan province.The azimuthal variation of the signals implies that they may be related to the effect of oceanic waves in South China Sea or southern Pacific ocean.The background signals show a seasonal variation,with the strongest signals appeared between June and September in a year.Comparing the signals with wind data,we could not find any relation between them.
引文
白志明,王椿镛.2003.云南地区上部地壳结构和地震构造环境的层析成像研究[J].地震学报,27(2):117-127.
房立华,吴建平,吕作勇.2009.华北地区基于噪声的瑞利面波群速度层析成像[J].地球物理学报,52(3):663-671.
李玉江,陈连旺,李红,叶际阳.2009.云南地区构造应力场与强震活动关系研究[J].大地测量与地球动力学,29(4):26-29.
刘志坤,黄金莉.2010.利用背景噪声互相关研究汶川地震震源区地震波速度变化[J].地球物理学报,53(4):853-863.
鲁来玉,何正勤,丁志峰,姚志祥.2009.华北科学探测台阵背景噪声特征分析[J].地球物理学报,52(10):2566-2572.
裴益轩,郭民.2001.滑动平均法的基本原理及应用[J].火炮发射与控制学报,(1):21-23.
汪一鹏,沈军,王琪,熊熊.2003.川滇块体的侧向挤出问题[J].地学前缘,10(1):188-192.
王义昭,熊家镛,林尧明.1988.云南地质构造的若干特点[J].云南地质,7(2):105-111.
郑庆鳌,俞国芬,王维贤.2006.云南地质(断裂)构造骨架新认识[J].云南地质,25(2):119-124.
Bensen G D,Ritzwoller M H,Barmin M P,Levshin A L,Lin F,Moschetti M P,Shapiro N M,Yang Y.2007.Process-ing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements[J].Geophys JInt,169:1239-1260.
Bromirski P D,Gerstoft P.2009.Dominant source regions of the Earth’s“hum”are coastal[J].Geophys Res Lett,36,L13303,doi:10.1029/2009GL038903.
Dziewonski A,Bloch S,Landisman M.1969.A technique for the analysis of transient seismic signals[J].Bull Seism SocAmer,59(1):427-444.
Herrmann R B,Ammon C J.2002.Computer Programs in Seismology:Surface Waves,Receiver Functions and CrustalStructure[M].Missouri:Saint Louis Univ,Saint Louis,MO,USA.
Levshin A L,Pisarenko V F,Pogrebinsky G A.1972.On a frequency-time analysis of oscillations[J].Ann Geophys,28(2):211-218.
Moschetti M P,Ritzwoller M H,Shapiro N M.2007.Surface wave tomography of the western United States from ambi-ent seismic noise:Rayleigh wave group velocity maps[J].Geochem Geophys Geosyst,8(8),doi:10.1029/2007GC001655.
Shapiro N M,Campillo M.2004.Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise[J].Geophys Res Lett,31,L07614,doi:10.1029/2004GL019491.
Snieder R.2004.Extracting the Green’s function from the correlation of coda waves:A derivation based on stationaryphase[J].Phys Rev E,69(4):46610.
Stehly L,Campillo M,Shapiro N M.2006.A study of the seismic noise from its long range correlation properties[J].JGeophys Res,111,B10306,doi:10.1029/2005JB004237.
Vassallo M,Bobbio A,Iannaccone G.2008.A comparison of sea-floor and on-land seismic ambient noise in the CampiFlegrei caldera,Southern Italy[J].Bull Seism Soc Amer,98(6):2962-2974,doi:10.1785/0120070152.
Wapenaar K.2004.Retrieving the elastodynamic Green’s function of an arbitrary inhomogeneous medium by cross corre-lation[J].Phys Rev Lett,93(25):254301,doi:10.1103/PhysRevLett.93.254301.
Wessel P,Smith W H F.1991.Free software helps map and display data[J].Eos Trans AGU,72(41):445-446.
Yang Y,Ritzwoller M H.2008.Characteristics of ambient seismic noise as a source for surface wave tomography[J].Geochem Geophys Geosyst,9(2):Q02008,doi:10.1029/2007GC001814.
Young C J,Chael E P,Withers M W,Aster R C.1996.A comparison of the high-frequency(>1Hz)surface and sub-surface noise environment at three sites in the United States[J].Bull Seism Soc Amer,86(5):1516-1528.
房立华,吴建平,吕作勇.2009.华北地区基于噪声的瑞利面波群速度层析成像[J].地球物理学报,52(3):663-671.
李玉江,陈连旺,李红,叶际阳.2009.云南地区构造应力场与强震活动关系研究[J].大地测量与地球动力学,29(4):26-29.
刘志坤,黄金莉.2010.利用背景噪声互相关研究汶川地震震源区地震波速度变化[J].地球物理学报,53(4):853-863.
鲁来玉,何正勤,丁志峰,姚志祥.2009.华北科学探测台阵背景噪声特征分析[J].地球物理学报,52(10):2566-2572.
裴益轩,郭民.2001.滑动平均法的基本原理及应用[J].火炮发射与控制学报,(1):21-23.
汪一鹏,沈军,王琪,熊熊.2003.川滇块体的侧向挤出问题[J].地学前缘,10(1):188-192.
王义昭,熊家镛,林尧明.1988.云南地质构造的若干特点[J].云南地质,7(2):105-111.
郑庆鳌,俞国芬,王维贤.2006.云南地质(断裂)构造骨架新认识[J].云南地质,25(2):119-124.
Bensen G D,Ritzwoller M H,Barmin M P,Levshin A L,Lin F,Moschetti M P,Shapiro N M,Yang Y.2007.Process-ing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements[J].Geophys JInt,169:1239-1260.
Bromirski P D,Gerstoft P.2009.Dominant source regions of the Earth’s“hum”are coastal[J].Geophys Res Lett,36,L13303,doi:10.1029/2009GL038903.
Dziewonski A,Bloch S,Landisman M.1969.A technique for the analysis of transient seismic signals[J].Bull Seism SocAmer,59(1):427-444.
Herrmann R B,Ammon C J.2002.Computer Programs in Seismology:Surface Waves,Receiver Functions and CrustalStructure[M].Missouri:Saint Louis Univ,Saint Louis,MO,USA.
Levshin A L,Pisarenko V F,Pogrebinsky G A.1972.On a frequency-time analysis of oscillations[J].Ann Geophys,28(2):211-218.
Moschetti M P,Ritzwoller M H,Shapiro N M.2007.Surface wave tomography of the western United States from ambi-ent seismic noise:Rayleigh wave group velocity maps[J].Geochem Geophys Geosyst,8(8),doi:10.1029/2007GC001655.
Shapiro N M,Campillo M.2004.Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise[J].Geophys Res Lett,31,L07614,doi:10.1029/2004GL019491.
Snieder R.2004.Extracting the Green’s function from the correlation of coda waves:A derivation based on stationaryphase[J].Phys Rev E,69(4):46610.
Stehly L,Campillo M,Shapiro N M.2006.A study of the seismic noise from its long range correlation properties[J].JGeophys Res,111,B10306,doi:10.1029/2005JB004237.
Vassallo M,Bobbio A,Iannaccone G.2008.A comparison of sea-floor and on-land seismic ambient noise in the CampiFlegrei caldera,Southern Italy[J].Bull Seism Soc Amer,98(6):2962-2974,doi:10.1785/0120070152.
Wapenaar K.2004.Retrieving the elastodynamic Green’s function of an arbitrary inhomogeneous medium by cross corre-lation[J].Phys Rev Lett,93(25):254301,doi:10.1103/PhysRevLett.93.254301.
Wessel P,Smith W H F.1991.Free software helps map and display data[J].Eos Trans AGU,72(41):445-446.
Yang Y,Ritzwoller M H.2008.Characteristics of ambient seismic noise as a source for surface wave tomography[J].Geochem Geophys Geosyst,9(2):Q02008,doi:10.1029/2007GC001814.
Young C J,Chael E P,Withers M W,Aster R C.1996.A comparison of the high-frequency(>1Hz)surface and sub-surface noise environment at three sites in the United States[J].Bull Seism Soc Amer,86(5):1516-1528.
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