多地震叠加提取双台间面波频散信息
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摘要
利用中国HIA台和哈撒克斯坦BRVK台的甚宽频地震仪记录的2011年日本MW9.0大地震及3次MW6—7强余震数据,采用互相关法提取了双台间的瑞雷波群速度频散曲线.研究发现,对于同一台记录的大地震和强余震激发的瑞雷波,其主要能量的周期范围明显不同,MW9.0大地震面波主要能量周期长(70s以上),而强余震面波的主要能量周期相对较短(10—50s).单独利用大地震数据无法提取60s以下的群速度频散,而单独利用强余震数据无法提取100s以上频散.将双台记录的特大地震、强余震数据进行互相关叠加,可以提取出较为可靠的宽频带瑞雷波群速度频散曲线(10—200s).
Using data of the 2011 Japan MW9.0 great earthquake and three strong aftershocks recorded by the very broadband seismometers of HIA station of China and BRVK station of Kazakhstan,the Rayleigh wave group velocity dispersion curves between the two stations are acquired by correlation method.The result shows that main energy of Rayleigh wave varies with earthquake magnitude,though the data are recorded by the same station.Main Rayleigh wave of the MW9.0 great earthquake has longer period(>70 s),and the main Rayleigh wave of the strong aftershocks has shorter period(10—50 s).The dispersion curve has a limit in band when using the data of the great earthquake or the aftershocks separately.The dispersion less than 60 s could not be obtained from the data of the great earthquake alone,and dispersion longer than 100 s could not be acquired from the aftershock data alone.However,broadband group velocity dispersion curve of Rayleigh wave(10—200 s) is acquired using multi-earthquake correlation data stacking.
Using data of the 2011 Japan MW9.0 great earthquake and three strong aftershocks recorded by the very broadband seismometers of HIA station of China and BRVK station of Kazakhstan,the Rayleigh wave group velocity dispersion curves between the two stations are acquired by correlation method.The result shows that main energy of Rayleigh wave varies with earthquake magnitude,though the data are recorded by the same station.Main Rayleigh wave of the MW9.0 great earthquake has longer period(>70 s),and the main Rayleigh wave of the strong aftershocks has shorter period(10—50 s).The dispersion curve has a limit in band when using the data of the great earthquake or the aftershocks separately.The dispersion less than 60 s could not be obtained from the data of the great earthquake alone,and dispersion longer than 100 s could not be acquired from the aftershock data alone.However,broadband group velocity dispersion curve of Rayleigh wave(10—200 s) is acquired using multi-earthquake correlation data stacking.
引文
陈国英,宋仲和,安昌强,陈立华,庄真,傅竹武,吕梓龄,胡家富.1991.华北地区三维地壳上地幔结构[J].地球物理学报,34(2):172--181.
陈国英,宋仲和,安昌强,苏小兰.1995.中国北部及其邻区地壳上地慢三维速度结构[J].地球物理学报,38(3):321-328.
冯锐,朱介寿,丁韫玉,陈国英,何正勤,杨树彬,周海南.1981.用地震面波研究中国地壳结构[J].地震学报,3(4):335--350.
何正勤,张天中,叶太兰,丁志峰.2000.河北平原北部的短周期面波频散与地壳中上部速度结构[J].地震学报,22(1):82--86.
李白基,师洁珊,宋子安,曾融生.1977.地震面波频散的数字计算:方法与试验[J].地球物理学报,20(4):283--298.
刘丽芳,苏有锦,刘杰,华卫.2007.用Moya方法反演云南数字地震台站场地响应[J].地震研究,30(1):39--42.
罗艳.2010.中小地震震源参数研究[D].合肥:中国科学技术大学:1--5.
宋仲和,安昌强,陈国英,陈立华,庄真,傅竹武,吕梓龄,胡家富.1991.中国西部三维速度结构及其各向异性[J].地球物理学报,34(6):694--707.
徐果明,李光品,王善恩,陈虹,周虎顺.2000.用瑞利面波资料反演中国大陆东部地壳上地幔横波速度的三维构造[J].地球物理学报,43(3):366--376.
徐果明,姚华建,朱良保,沈玉松.2007.中国西部及其邻域地壳上地幔横波速度结构[J].地球物理学报,50(1):193-208.
易桂喜,姚华建,朱介寿,Robert D van der Hilst.2008.中国大陆及邻区瑞雷面波相速度分布特征[J].地球物理学报,51(2):402--411.
朱良保,许庆,陈晓非.2002.中国大陆及邻近海域的Rayleigh波群速度分布[J].地球物理学报,45(4):475--482.
Alexander S S.1963.Surface Wave Propagation in the Western United States[D].Pasadena,California,America:California Institute of Technology:1--50.
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.2004.Computer Programs in Seismology3.30[CP/OL].[2011-10-05].http:∥www.eas.slu.edu/eqc/eqccps.html
Landisman M,Dziewonski A,Sato Y.1969.Recent improvement in the analysis of surface wave observations[J].Geophys J R astr Soc,17(4):369--403.
Levshin A L,Ritzwoller M H,Barmin M P,Stevens J L.2001.Short period group velocity measurements and maps inCentral Asia[C]∥Casey L A ed.Proceedings of the23rd Seismic Research Review:Worldwide Monitoring of Nuclear Explosions.Jackson Hole,Wyoming,United States:National Nuclear Security Administration:258--269.
Pilant W L,Knopoff L.1964.Observation of multiple seismic events[J].Bull Seism Soc Amer,54(1):19--39.
Sato Y.1955.Analysis of dispersed surface waves by means of fourier transform(Ⅰ)[J].Bull Earthq Res Inst TokyoUniv,33:33--47.
Sato Y.1956a.Analysis of dispersed surface waves by means of fourier transform(Ⅱ)[J].Bull Earthq Res Inst TokyoUniv,34:9--18.
Sato Y.1956b.Analysis of dispersed surface waves by means of fourier transform(Ⅲ)[J].Bull Earthq Res Inst TokyoUniv,34:131--138.
Shearer P M.1999.Introduction to Seismology[M].Cambridge,United Kingdom:Cambridge University Press:144--153.
陈国英,宋仲和,安昌强,苏小兰.1995.中国北部及其邻区地壳上地慢三维速度结构[J].地球物理学报,38(3):321-328.
冯锐,朱介寿,丁韫玉,陈国英,何正勤,杨树彬,周海南.1981.用地震面波研究中国地壳结构[J].地震学报,3(4):335--350.
何正勤,张天中,叶太兰,丁志峰.2000.河北平原北部的短周期面波频散与地壳中上部速度结构[J].地震学报,22(1):82--86.
李白基,师洁珊,宋子安,曾融生.1977.地震面波频散的数字计算:方法与试验[J].地球物理学报,20(4):283--298.
刘丽芳,苏有锦,刘杰,华卫.2007.用Moya方法反演云南数字地震台站场地响应[J].地震研究,30(1):39--42.
罗艳.2010.中小地震震源参数研究[D].合肥:中国科学技术大学:1--5.
宋仲和,安昌强,陈国英,陈立华,庄真,傅竹武,吕梓龄,胡家富.1991.中国西部三维速度结构及其各向异性[J].地球物理学报,34(6):694--707.
徐果明,李光品,王善恩,陈虹,周虎顺.2000.用瑞利面波资料反演中国大陆东部地壳上地幔横波速度的三维构造[J].地球物理学报,43(3):366--376.
徐果明,姚华建,朱良保,沈玉松.2007.中国西部及其邻域地壳上地幔横波速度结构[J].地球物理学报,50(1):193-208.
易桂喜,姚华建,朱介寿,Robert D van der Hilst.2008.中国大陆及邻区瑞雷面波相速度分布特征[J].地球物理学报,51(2):402--411.
朱良保,许庆,陈晓非.2002.中国大陆及邻近海域的Rayleigh波群速度分布[J].地球物理学报,45(4):475--482.
Alexander S S.1963.Surface Wave Propagation in the Western United States[D].Pasadena,California,America:California Institute of Technology:1--50.
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.2004.Computer Programs in Seismology3.30[CP/OL].[2011-10-05].http:∥www.eas.slu.edu/eqc/eqccps.html
Landisman M,Dziewonski A,Sato Y.1969.Recent improvement in the analysis of surface wave observations[J].Geophys J R astr Soc,17(4):369--403.
Levshin A L,Ritzwoller M H,Barmin M P,Stevens J L.2001.Short period group velocity measurements and maps inCentral Asia[C]∥Casey L A ed.Proceedings of the23rd Seismic Research Review:Worldwide Monitoring of Nuclear Explosions.Jackson Hole,Wyoming,United States:National Nuclear Security Administration:258--269.
Pilant W L,Knopoff L.1964.Observation of multiple seismic events[J].Bull Seism Soc Amer,54(1):19--39.
Sato Y.1955.Analysis of dispersed surface waves by means of fourier transform(Ⅰ)[J].Bull Earthq Res Inst TokyoUniv,33:33--47.
Sato Y.1956a.Analysis of dispersed surface waves by means of fourier transform(Ⅱ)[J].Bull Earthq Res Inst TokyoUniv,34:9--18.
Sato Y.1956b.Analysis of dispersed surface waves by means of fourier transform(Ⅲ)[J].Bull Earthq Res Inst TokyoUniv,34:131--138.
Shearer P M.1999.Introduction to Seismology[M].Cambridge,United Kingdom:Cambridge University Press:144--153.
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