三峡库首区最小一维速度模型研究
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摘要
根据三峡台网2001~2006年记录的490个地震事件中的7 330条P波和3 524条S波到时资料,利用Kissling方法得到了三峡库区最小一维P波和S波速度模型以及台站校正值,并应用于地震的精定位。重新定位后地震走时残差均方根从原来的0.56 s下降到0.41 s,地震定位精度在经度、纬度、深度方向上有了较大提高。
Using 7 330 P arrivals and 3 524 S arrivals from 490 events observed by the Three Gorges seismic network,the minimum 1D velocity model including P wave model,S wave model and station corrections is obtained with the Kissling method and then the model is applied to precise earthquake location.The residual RMS of the relocated events has reduced from 0.56 s to 0.41 s,thus great improvement of the accuracy of hypocenter location has been made in the east,north,and vertical direction.The result indicates that the minimum 1D velocity model is better than other models.
Using 7 330 P arrivals and 3 524 S arrivals from 490 events observed by the Three Gorges seismic network,the minimum 1D velocity model including P wave model,S wave model and station corrections is obtained with the Kissling method and then the model is applied to precise earthquake location.The residual RMS of the relocated events has reduced from 0.56 s to 0.41 s,thus great improvement of the accuracy of hypocenter location has been made in the east,north,and vertical direction.The result indicates that the minimum 1D velocity model is better than other models.
引文
1 Kissling E,et al.Initial reference models in local earth-quake tomography[J].J.Geophys.Res.,1994,99:19635-19 646.
2 Kissling E.Geotomography with local earthquake data[J].Rev Geophys.,1988,26:659-698.
3 Kissling E,et al.Improved seismic velocity reference modelfrom local earthquake data in Northwestern Italy[J].TerraNova,1995,7:528-534.
4 Husen S,et al.Accurate hypocentre determination in theseismogenic zone of the subducting Nazca Plate in northernChile using a combined on-offshore network[J].Geophys.J.Int.,1999,138:687-701.
5 Hesham Mohamed and Kaoru Miyashita.One-dimensional P-wave velocity structure in the northern Red Sea area,de-duced from travel time data[J].Earth Planets Space,2001,53:695-702.
6 Musumeci C,et al.Minimum 1D velocity model in South-eastern Sicily(Italy)from local earthquake data:an im-provement in location accuracy[J].Journal of Seismology,2003,7:469-478.
7于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1~14.
8 Sherburn S and White R S.Crustal seismicity in Taranaki,New Zealand using accurate hypocentres from a dense net-work[J].Geophys.J.Int.,2005,162:494-506.
9长江水利委员会.三峡工程地质研究[M].武汉:湖北科学技术出版社,1997.
10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.
11陈学波,陈步云,张四维,等.长江三峡工程坝区及外围深度构造特征研究[A].见:陈学波等主编.长江三峡工程坝区及外围深度构造特征研究[C].北京:地震出版社,1994.
12陈步云,高文海.贾家湾-沙园剖面地壳结构的初步研究[J].地壳形变与地震,1986,6(4):357~364.
13 Thurber C H.Hypocenter-velocity structure coupling inlocal earthquake tomography[J].Phys.Earth planet.In-ter.,1992,75:55-62.
14 Kissling E,et al.VELESTUser’s Guide-Short Introduc-tion[R].Institute of geophysics and Swiss seismologicalservice,ETH,Zurich.1995.
15严尊国,薛军蓉.长江三峡地区弱震重新定位[J].中国地震,1987,3(1):52~59.
16严尊国,薛军容,李普丽.长江三峡地区地震空间基本特征研究[A].见:陈学波等主编.长江三峡工程坝区及外围深度构造特征研究[C].北京:地震出版社,1994.
17张爱民,李强.双差定位在三峡库区地震定位中的应用[J].大地测量与地球动力学,2006,26(3):73~77.
18 Maurer Hand Kradolfer U.Hypocentral parameters and ve-locity estimation in the western Swiss alps by simultaneousinversion of P and S wave data[J].Bull.seism.Soc.Am.,1996,86:32-42.
2 Kissling E.Geotomography with local earthquake data[J].Rev Geophys.,1988,26:659-698.
3 Kissling E,et al.Improved seismic velocity reference modelfrom local earthquake data in Northwestern Italy[J].TerraNova,1995,7:528-534.
4 Husen S,et al.Accurate hypocentre determination in theseismogenic zone of the subducting Nazca Plate in northernChile using a combined on-offshore network[J].Geophys.J.Int.,1999,138:687-701.
5 Hesham Mohamed and Kaoru Miyashita.One-dimensional P-wave velocity structure in the northern Red Sea area,de-duced from travel time data[J].Earth Planets Space,2001,53:695-702.
6 Musumeci C,et al.Minimum 1D velocity model in South-eastern Sicily(Italy)from local earthquake data:an im-provement in location accuracy[J].Journal of Seismology,2003,7:469-478.
7于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1~14.
8 Sherburn S and White R S.Crustal seismicity in Taranaki,New Zealand using accurate hypocentres from a dense net-work[J].Geophys.J.Int.,2005,162:494-506.
9长江水利委员会.三峡工程地质研究[M].武汉:湖北科学技术出版社,1997.
10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.
11陈学波,陈步云,张四维,等.长江三峡工程坝区及外围深度构造特征研究[A].见:陈学波等主编.长江三峡工程坝区及外围深度构造特征研究[C].北京:地震出版社,1994.
12陈步云,高文海.贾家湾-沙园剖面地壳结构的初步研究[J].地壳形变与地震,1986,6(4):357~364.
13 Thurber C H.Hypocenter-velocity structure coupling inlocal earthquake tomography[J].Phys.Earth planet.In-ter.,1992,75:55-62.
14 Kissling E,et al.VELESTUser’s Guide-Short Introduc-tion[R].Institute of geophysics and Swiss seismologicalservice,ETH,Zurich.1995.
15严尊国,薛军蓉.长江三峡地区弱震重新定位[J].中国地震,1987,3(1):52~59.
16严尊国,薛军容,李普丽.长江三峡地区地震空间基本特征研究[A].见:陈学波等主编.长江三峡工程坝区及外围深度构造特征研究[C].北京:地震出版社,1994.
17张爱民,李强.双差定位在三峡库区地震定位中的应用[J].大地测量与地球动力学,2006,26(3):73~77.
18 Maurer Hand Kradolfer U.Hypocentral parameters and ve-locity estimation in the western Swiss alps by simultaneousinversion of P and S wave data[J].Bull.seism.Soc.Am.,1996,86:32-42.
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