三峡地区P波速度层析成像研究
|
摘要
利用三峡台网及其周边10个台站2001～2006年的17243条P波初至记录,研究了三峡地区的P波速度结构。结果表明:三峡地区P波速度横向差异明显,浅层的速度变化与地表构造关系密切;从上到下的速度等值线走向变化体现了该地区的构造应力场演化历史;1979年秭归5.1级地震发生在介质速度剧烈变化的部位,位于高速体与低速体之间。
The P wave velocity structure is studied on the basis of the 17 324 P wave arrive data recorded by the Three Gorges seismic telemetry network and other ten stations around it from 2001 to 2006.The result of the tomography indicates that the lateral inhomogeneity of the P wave velocity structure in the region is significant.The distribution of the velocity in shallow layer is closely related to the geological tectonic of the surface.The change of the P wave velocity from upper crust to lower crust is consistent with the evolution history of the tectonic stress filed.The Zigui M5.1 earthquake occured in sharp gradient zones of velocity and located between the zones of low velocity and high velocity zone.
The P wave velocity structure is studied on the basis of the 17 324 P wave arrive data recorded by the Three Gorges seismic telemetry network and other ten stations around it from 2001 to 2006.The result of the tomography indicates that the lateral inhomogeneity of the P wave velocity structure in the region is significant.The distribution of the velocity in shallow layer is closely related to the geological tectonic of the surface.The change of the P wave velocity from upper crust to lower crust is consistent with the evolution history of the tectonic stress filed.The Zigui M5.1 earthquake occured in sharp gradient zones of velocity and located between the zones of low velocity and high velocity zone.
引文
[1]湖北省地震观测目录,2001～2006.
1谭周地,薄景山.长江三峡工程库首区地壳稳定性评价与水库诱发地震预测[M].北京:地质出版社,1991.1Tan Zhoudi and Bo Jingshan.Crust stability evaluation and reservoir-induced earthquake prediction for the front region of the supposed reservoir for the Three Gorges project[M].Beijing:Geological Publishing House,1991.(in Chinese)
2陈学波.长江三峡工程坝区及外围深部构造特征研究[M].北京:地震出版社,1994.2Chen Xuebo.The research on characteristics of the deep tec-tonics in the Three Gorges and neighboring area[M].Bei-jing:Seismological Press,1994.(in Chinese)
3李安然,等.峡东工程地震[M].北京:地震出版社,1996.3Li Anran,et al.Engineering seismology in the Eastpart of the Three Gorges[M].Beijing:Seismological Press,1996.(in Chinese)
4高士钧,等.长江三峡地区地壳应力场与地震[M].北京:地震出版社,1992.4Gao Shijun,et al.Crustal stress field and earthquake in the Three Gorge area[M].Beijing:Seismological Press,1992.(in Chinese)
5杨淑贤,等.三峡及邻区新构造期以来应力场分区研究[J].大地测量与地球动力学,2005,25(4):42～45.5Yang Shuxian,et al.Study on stress field zoning in Three Gorges and its adjacent area since neotectonic age[J].Jour-nal of Geodesy and Geodynamics,2005,25(4):42-45.(in Chinese)
6Zhao D,Hasegawa A and Horiuchi A.Tomographic imaging of P and S wave velocity structure beneath northeastern Japan[J].J.Geophys.Res.,1992,97:19909-19928.
7Zhao D,Hasegawa A and Kanamori H.Deep structure of Ja-pan subduction zone as derived from local,regional,and teleseismic events[J].J.Geophys.Res.,1994,99:22313-22329.
8Um J and Thurber C H.Afast algorithm for two-point seismic ray tracing[J].Bull Seismol.Soc.Am.,1987,77:972-986.
9Paige C C and Saunders M A.LSQR:An algorithm for spase linear equations and sparse least squares[J].Assoc.Com-put.Mach.Trans.Math.Software,1982,8:43-71.
10嘉世旭,齐诚,王夫运,等.首都圈地壳网格化三维结构[J].地球物理学报,2005,48(6):1316～1324.10Jia Shixu,Qi Cheng,Wang Fuyun,et al.Three-dimensional crustal gridding structure of the capital area[J].Chinese J.Geophys,2005,48(6):1316-1324.(in Chinese)
11齐诚,赵大鹏,陈颙,等.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,2006,49(3):805～815.11Qi Cheng,Zhao Ddpeng,Chen,Yong,et al.3-D P and S wave velocity structures and their relationship to strong earthquakes in the Chinese capital region[J].J.Geophy,2006,49(3):805-815.(in Chinese)
1谭周地,薄景山.长江三峡工程库首区地壳稳定性评价与水库诱发地震预测[M].北京:地质出版社,1991.1Tan Zhoudi and Bo Jingshan.Crust stability evaluation and reservoir-induced earthquake prediction for the front region of the supposed reservoir for the Three Gorges project[M].Beijing:Geological Publishing House,1991.(in Chinese)
2陈学波.长江三峡工程坝区及外围深部构造特征研究[M].北京:地震出版社,1994.2Chen Xuebo.The research on characteristics of the deep tec-tonics in the Three Gorges and neighboring area[M].Bei-jing:Seismological Press,1994.(in Chinese)
3李安然,等.峡东工程地震[M].北京:地震出版社,1996.3Li Anran,et al.Engineering seismology in the Eastpart of the Three Gorges[M].Beijing:Seismological Press,1996.(in Chinese)
4高士钧,等.长江三峡地区地壳应力场与地震[M].北京:地震出版社,1992.4Gao Shijun,et al.Crustal stress field and earthquake in the Three Gorge area[M].Beijing:Seismological Press,1992.(in Chinese)
5杨淑贤,等.三峡及邻区新构造期以来应力场分区研究[J].大地测量与地球动力学,2005,25(4):42～45.5Yang Shuxian,et al.Study on stress field zoning in Three Gorges and its adjacent area since neotectonic age[J].Jour-nal of Geodesy and Geodynamics,2005,25(4):42-45.(in Chinese)
6Zhao D,Hasegawa A and Horiuchi A.Tomographic imaging of P and S wave velocity structure beneath northeastern Japan[J].J.Geophys.Res.,1992,97:19909-19928.
7Zhao D,Hasegawa A and Kanamori H.Deep structure of Ja-pan subduction zone as derived from local,regional,and teleseismic events[J].J.Geophys.Res.,1994,99:22313-22329.
8Um J and Thurber C H.Afast algorithm for two-point seismic ray tracing[J].Bull Seismol.Soc.Am.,1987,77:972-986.
9Paige C C and Saunders M A.LSQR:An algorithm for spase linear equations and sparse least squares[J].Assoc.Com-put.Mach.Trans.Math.Software,1982,8:43-71.
10嘉世旭,齐诚,王夫运,等.首都圈地壳网格化三维结构[J].地球物理学报,2005,48(6):1316～1324.10Jia Shixu,Qi Cheng,Wang Fuyun,et al.Three-dimensional crustal gridding structure of the capital area[J].Chinese J.Geophys,2005,48(6):1316-1324.(in Chinese)
11齐诚,赵大鹏,陈颙,等.首都圈地区地壳P波和S波三维速度结构及其与大地震的关系[J].地球物理学报,2006,49(3):805～815.11Qi Cheng,Zhao Ddpeng,Chen,Yong,et al.3-D P and S wave velocity structures and their relationship to strong earthquakes in the Chinese capital region[J].J.Geophy,2006,49(3):805-815.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心