四川盆地中部浅层地壳一维剪切波速度结构初步研究
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摘要
2010年1月31日四川盆地中部的遂宁发生了M5.0地震,四川盆地内部的台站观测到了很强的短周期面波波形数据。本文对地震数据的Rayleigh波和Love波提取基阶群速度频散曲线并反演得到四川盆地中部浅层地壳一维剪切波波速度结构。研究结果表明,四川盆地中部近地表剪切波平均速度约为2km/s,并且随深度逐渐增加,地壳深度在10km左右时,剪切波速度达到了3.5km/s。此结果适用于四川盆地中部以西,从遂宁到龙泉山附近,而四川盆地东部,从遂宁到华蓥山断裂不适用。该结果可为龙门山断裂附近的三维结构研究提供参考,并对强地面运动计算和区域内地震定位的研究有一定参考价值。
An M5. 0 earthquake occurred in Suining,Sichuan Province,on 31 January 2010. Strong short periods surface wave are recorded by Seismometers in Sichuan basin. We extract the fundamental dispersion cures of Rayleigh and Love's group velocity from those data. Then we inverse the shear wave velocity of central Sichuan basin. Our results show that near surface S wave average velocity of Sichuan Basin is about 2 km/s,and it increases with depth,reaches to 3. 5 km/s at about 10 km depth. This structure is suitable from Suining to Longquanshan. The results are useful to both the prediction of strong ground motion and local epicenter determination. .
An M5. 0 earthquake occurred in Suining,Sichuan Province,on 31 January 2010. Strong short periods surface wave are recorded by Seismometers in Sichuan basin. We extract the fundamental dispersion cures of Rayleigh and Love's group velocity from those data. Then we inverse the shear wave velocity of central Sichuan basin. Our results show that near surface S wave average velocity of Sichuan Basin is about 2 km/s,and it increases with depth,reaches to 3. 5 km/s at about 10 km depth. This structure is suitable from Suining to Longquanshan. The results are useful to both the prediction of strong ground motion and local epicenter determination. .
引文
[1]王椿镛,吴建平,楼海,等.川西藏东地区的地壳P波速度结构[J].中国科学,2003,33:181-189.
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[3]Kissling E,W L Ellsworth,D Eberhart-Phillips,Kradolfer U.Initial reference models in local earthquake tomography[J].Journal of Geophysical Research,1994,99:19-19.
[4]Narayan J P.Strong ground motion simulation using shear dislocation sources[J].Geofizika,2000,16(17):1999-2000.
[5]陈棋福,刘澜波,王伟君,Eric Rohrbach.利用地脉动探测北京地区的地震动场地响应[J].中国科学,2008,53(018):2229-2235.
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[7]沈传波,梅廉夫,徐振平,等.四川盆地复合盆山体系的结构构造和演化[J].大地构造与成矿学,2007,31(003):288-299.
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[9]江为为,刘一克,郝天珧,等.四川盆地综合地质、地球物理研究[J].地球物理学进展,2001,16(001):11-23.
[10]胡光灿,谢姚.中国四川东部高陡构造石炭系气田[M].北京:石油工业出版社,1997:14-16.
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[14]Xu Y,Zhiwei LiRunqiu Huang,et al.Seismic structure of the Longmen Shan region from S-wave tomography and its relation-ship with the Wenchuan Ms8.0earthquake on12May2008,southwestern China[J].Geophysical Research Letters,2010,37(2):L02304.
[15]孙若昧,刘福田,刘建华.四川地区的地震层析成像[J].地球物理学报,1991,34(006):708-716.
[16]徐果明,姚华建,朱良保,等.中国西部及领域地壳上地幔横波速度结构[J].地球物理学报,2007,50(001):193-208.
[17]徐朝繁,潘纪顺,王夫运,等.龙门山及其邻近地区深部地球物理探测[J].大地测量与地球动力学,2008,28(006):31-37.
[18]罗艳,倪四道,陈颙,等.一个发生在沉积盖层里的破坏性地震-2010年1月31日四川遂宁-重庆潼南地震[J].科学通报,2011,(2).
[19]Xia J,Richard D Miller,Choon B Park.Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves[J].Geophysics,1999,64(3):691-700.
[20]Aki K,Richards,Paul G.Quantitative seismology[M].San Francisco:W.H.Freeman and Company,1980:259-330.
[21]Herrmann R B,Ammon C J.Surface waves,receiver functions and crustal structure.Computer Programs in Seismology,Ver-sion3.30,Saint Louis University.http://www.eas.slu.edu/People/RBHerrmann/CPS330.html.,2004
[22]周青云,何永峰,靳平,等.利用多重滤波方法提取面波频散曲线[J].西北地震学报,2006,28(001):46-50.
[23]石耀霖,金文.面波频散反演地球内部构造的遗传算法[J].地球物理学报,1995,38(002):189-198.
[24]Dal Moro G,M Pipan,P Gabrielli,et al.Rayleigh wave dispersion curve inversion via genetic algorithms and marginal poste-rior probability density estimation[J].Journal of Applied Geophysics,2007,61(1):39-55.
[25]翟佳羽,赵园园,安丁酉.面波频散反演地下层状结构的蚁群算法[J].物探与化探,2010,34(4):476-481.
[26]徐果明,李光品,王善恩,等.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,2000,43(3):366-376.
[27]万柯松,倪四道,赵里.龙门山周边地区地震波速度结构的有限频率反演[J].国际地震动态,2010,(06):16-16.
[28]沈伟森,罗艳,倪四道,等.天然地震频率范围内首都圈地区近地表S波速度结构[J].地震学报,2010,(02):137-146.
[29]Levshin Anatoli,Michael H.Ritzwoller,Joe S.Resovsky.Source effects on surface wave group travel times and group veloci-ty maps[J].Physics of the Earth and Planetary Interiors,1999,115(3-4):293–312.
[30]Julia J,C J Ammon,R B Herrmann,et al.Joint inversion of receiver function and surface wave dispersion observations[J].Geophysical Journal International,2000,143(1):99-112.
[2]Li H,W Su,C-Y Wang,et al.Ambient noise rayleigh wave tomography in western Sichuan and eastern Tibet[J].Earth and Planetary Science Letters,2008,282(1-4):201-211.
[3]Kissling E,W L Ellsworth,D Eberhart-Phillips,Kradolfer U.Initial reference models in local earthquake tomography[J].Journal of Geophysical Research,1994,99:19-19.
[4]Narayan J P.Strong ground motion simulation using shear dislocation sources[J].Geofizika,2000,16(17):1999-2000.
[5]陈棋福,刘澜波,王伟君,Eric Rohrbach.利用地脉动探测北京地区的地震动场地响应[J].中国科学,2008,53(018):2229-2235.
[6]Sun Y,Sadi Kuleli F,Dale Morgan,et al.Location robustness of earthquakes in Sichuan Province,China[J].Seismological Research Letters,2004,75(1):54-62.
[7]沈传波,梅廉夫,徐振平,等.四川盆地复合盆山体系的结构构造和演化[J].大地构造与成矿学,2007,31(003):288-299.
[8]宋鸿彪,罗志立.四川盆地基地及深部地质结构研究的进展[J].地学前缘,1995,2(004):231-237.
[9]江为为,刘一克,郝天珧,等.四川盆地综合地质、地球物理研究[J].地球物理学进展,2001,16(001):11-23.
[10]胡光灿,谢姚.中国四川东部高陡构造石炭系气田[M].北京:石油工业出版社,1997:14-16.
[11]秦启荣,苏培东,李乐,等.川中低缓构造成因[J].新疆石油地质,2005,26(001):108-111.
[12]汪泽成,赵文智,张林.四川盆地构造层序与天然气勘探[M].北京:地质出版社,2002:70-105.
[13]Chen Y,Jose Badal,JiaFu Hu.Love and rayleigh wave tomography of the Qinghai-Tibet Plateau and surrounding areas[J],Pure and Applied Geophysics,2010,167(10):1171-1203.
[14]Xu Y,Zhiwei LiRunqiu Huang,et al.Seismic structure of the Longmen Shan region from S-wave tomography and its relation-ship with the Wenchuan Ms8.0earthquake on12May2008,southwestern China[J].Geophysical Research Letters,2010,37(2):L02304.
[15]孙若昧,刘福田,刘建华.四川地区的地震层析成像[J].地球物理学报,1991,34(006):708-716.
[16]徐果明,姚华建,朱良保,等.中国西部及领域地壳上地幔横波速度结构[J].地球物理学报,2007,50(001):193-208.
[17]徐朝繁,潘纪顺,王夫运,等.龙门山及其邻近地区深部地球物理探测[J].大地测量与地球动力学,2008,28(006):31-37.
[18]罗艳,倪四道,陈颙,等.一个发生在沉积盖层里的破坏性地震-2010年1月31日四川遂宁-重庆潼南地震[J].科学通报,2011,(2).
[19]Xia J,Richard D Miller,Choon B Park.Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves[J].Geophysics,1999,64(3):691-700.
[20]Aki K,Richards,Paul G.Quantitative seismology[M].San Francisco:W.H.Freeman and Company,1980:259-330.
[21]Herrmann R B,Ammon C J.Surface waves,receiver functions and crustal structure.Computer Programs in Seismology,Ver-sion3.30,Saint Louis University.http://www.eas.slu.edu/People/RBHerrmann/CPS330.html.,2004
[22]周青云,何永峰,靳平,等.利用多重滤波方法提取面波频散曲线[J].西北地震学报,2006,28(001):46-50.
[23]石耀霖,金文.面波频散反演地球内部构造的遗传算法[J].地球物理学报,1995,38(002):189-198.
[24]Dal Moro G,M Pipan,P Gabrielli,et al.Rayleigh wave dispersion curve inversion via genetic algorithms and marginal poste-rior probability density estimation[J].Journal of Applied Geophysics,2007,61(1):39-55.
[25]翟佳羽,赵园园,安丁酉.面波频散反演地下层状结构的蚁群算法[J].物探与化探,2010,34(4):476-481.
[26]徐果明,李光品,王善恩,等.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,2000,43(3):366-376.
[27]万柯松,倪四道,赵里.龙门山周边地区地震波速度结构的有限频率反演[J].国际地震动态,2010,(06):16-16.
[28]沈伟森,罗艳,倪四道,等.天然地震频率范围内首都圈地区近地表S波速度结构[J].地震学报,2010,(02):137-146.
[29]Levshin Anatoli,Michael H.Ritzwoller,Joe S.Resovsky.Source effects on surface wave group travel times and group veloci-ty maps[J].Physics of the Earth and Planetary Interiors,1999,115(3-4):293–312.
[30]Julia J,C J Ammon,R B Herrmann,et al.Joint inversion of receiver function and surface wave dispersion observations[J].Geophysical Journal International,2000,143(1):99-112.
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