利用流动GPS测定2011年日本M_W9.0地震远场同震位移
|
摘要
采用1999—2017年我国东北和华北地区的流动GPS观测资料,对比坐标时间序列直接解算、连续GPS同震位移插值结果约束解算、位错模型模拟同震位移约束解算和由上述2种外部数据同时约束解算等4种解算策略,获得了2011年日本M_W9.0地震远场同震位移,并由该远场同震位移约束反演了此次地震的静态位错。结果表明:在利用流动GPS解算量级较小的同震位移时,由外部可靠数据作为约束可获得较为理想的结果;流动GPS测定的2011年日本M_W9.0地震在我国东北和华北地区造成的远场同震位移最大可达33 mm,以东向位移为主;由远场同震水平位移和近场同震垂直位移约束得到的静态位错对应的矩震级M_W为8.77,最大同震位错量为21.09 m。
The campaign GPS observations in the northeastern China from 1999 to 2017 are used to derive the far-field coseismic displacements of the 2011 Tohoku-oki M_W9.0 earthquake,Japan.The strategies include direct calculation with the coordinate time series,constrained calculation with the interpolated coseismic displacements from continuous GPS observations,constrained calculation with the simulated coseismic displacements from dislocation model and constrained calculation with both the above two external data are compared.Then the best far-field coseismic horizontal displacements as well as the near field coseismic vertical displacements are used to invert the static dislocation model of the earthquake.The results showthat when the campaign GPS data are used to inverse the coseismic displacements of small magnitude,using external reliable data as constraint is conducive to getting more satisfactory results.And the maximum far-field coseismic displacements in northeastern China can reach 33 mm and the dominated displacements is eastward.The resultant moment magnitude corresponding to the coseismic dislocation inversion is M_W8.77 and the largest dislocation of this earthquake is 21.09 m.
The campaign GPS observations in the northeastern China from 1999 to 2017 are used to derive the far-field coseismic displacements of the 2011 Tohoku-oki M_W9.0 earthquake,Japan.The strategies include direct calculation with the coordinate time series,constrained calculation with the interpolated coseismic displacements from continuous GPS observations,constrained calculation with the simulated coseismic displacements from dislocation model and constrained calculation with both the above two external data are compared.Then the best far-field coseismic horizontal displacements as well as the near field coseismic vertical displacements are used to invert the static dislocation model of the earthquake.The results showthat when the campaign GPS data are used to inverse the coseismic displacements of small magnitude,using external reliable data as constraint is conducive to getting more satisfactory results.And the maximum far-field coseismic displacements in northeastern China can reach 33 mm and the dominated displacements is eastward.The resultant moment magnitude corresponding to the coseismic dislocation inversion is M_W8.77 and the largest dislocation of this earthquake is 21.09 m.
引文
蔡华,孙汉荣,赵齐乐,等.2012.GPS测定的2011年日本9.0级地震的中国大陆地区同震位移场[J].武汉大学学报(信息科学版),37(8):953-955.
单新建,屈春燕,郭利民,等.2014.基于InSAR与GPS观测的汶川同震垂直形变场的获取[J].地震地质,36(3):718-730.
刁法启,熊熊,倪四道,等.2011.利用GPS位移反演日本MW9.0仙台地震及MW7.9强余震静态位错模型[J].科学通报,56(24):1999-2005.
刁法启,熊熊,郑勇.2012.MW9.0日本Tohoku大地震静态位错模型:陆地GPS资料和海底GPS/Acoustic资料联合反演的结果[J].科学通报,57(18):1676-1683.
国家重大科学工程“中国地壳运动观测网络”项目组.2008.GPS测定的2008年汶川MS8.0级地震的同震位移场[J].中国科学:地球科学,38(10):1195-1206.
郝明,王庆良,崔笃信,等.2012.根据GPS和水准资料反演2008年汶川地震同震破裂模型[J].地震研究,35(3):323-329.
季灵运,刘传金,徐晶,等.2017.九寨沟MS7.0地震的InSAR观测及发震构造分析[J].地球物理学报,60(10):4069-4082.
万永革,王敏,沈正康,等.2004.利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布[J].地震地质,26(3):393-404.
王敏,李强,王凡,等.2011.全球定位系统测定的2011年日本宫城MW9.0级地震远场同震位移[J].科学通报,56(20):1593-1596.
王敏,张培震,沈正康,等.2006.全球定位系统(GPS)测定的印尼苏门达腊巨震的远场同震地表位移[J].科学通报,51(3):365-368.
杨国华,朱爽,梁洪宝,等.2015.芦山MS7.0级地震震前及同震地表形变[J].武汉大学学报(信息科学版),40(1):121-127.
杨少敏,聂兆生,贾志革,等.2011.GPS解算的日本MW9.0级地震的远场同震地表位移[J].武汉大学学报(信息科学版),36(11):1336-1339.
占伟,武艳强,梁洪宝,等.2015.GPS观测结果反映的尼泊尔MW7.8地震孕震特征[J].地球物理学报,58(5):1818-1826.
Bletery Q,Sladen A,Delouis B,et al.2015.A detailed source model for the MW9.0 Tohoku‐Oki earthquake reconciling geodesy,seismology,and tsunami records[J].Journal of Geophysical Research Solid Earth,119(10):7636-7653.
Plafker G.1965.Tectonic Deformation Associated with the 1964 Alaska Earthquake:The earthquake of 27 March 1964 resulted in observable crustal deformation of unprecedented areal extent[J].Science,148(3678):1675-1687.
Sun W,Okubo S,Fu G,et al.2010.General formulations of global coseismic deformations caused by an arbitrary dislocation in a spherically symmetric earth model-applicable to deformed earth surface and space‐fixed point[J].Geophysical Journal of the Royal Astronomical Society,177(3):817-833.
Wang C,Ding X,Shan X,et al.2012.Slip distribution of the 2011 Tohoku earthquake derived from joint inversion of GPS,InSAR and seafloor GPS/acoustic measurements[J].Journal of Asian Earth Sciences,57(6):128-136.
Wang R,Schurr B,Milkereit C,et al.2011.An Improved Automatic Scheme for Empirical Baseline Correction of Digital Strong-Motion Records[J].Bulletin of the Seismological Society of America,101(5):2029-2044.
Wang R,Parolai S,Ge M,et al.2013.The 2011 MW9.0 Tohoku Earthquake:Comparison of GPS and Strong-Motion Data[J].Bulletin of the Seismological Society of America,103(2B):1336-1347.
Wang W,Sun W,Wu Y,et al.2014.Modification of fault slip models of the MW9.0 Tohoku Earthquake by far field GPS observations[J].Journal of Geodynamics,75(4):22-33.
Wei S,Graves R,Helmberger D,et al.2012.Sources of shaking and flooding during the Tohoku-Oki earthquake:A mixture of rupture styles[J].Earth&Planetary Science Letters,333-334(6):91-100.
Wu Y,Jiang Z,Liang H,et al.2016.Coseismic deformations of the 2015MW7.8 Gorkha earthquake and interseismic strain accumulation in the Himalayan tectonic belt and Tibetan plateau[J].Tectonophysics,670:144-154.
单新建,屈春燕,郭利民,等.2014.基于InSAR与GPS观测的汶川同震垂直形变场的获取[J].地震地质,36(3):718-730.
刁法启,熊熊,倪四道,等.2011.利用GPS位移反演日本MW9.0仙台地震及MW7.9强余震静态位错模型[J].科学通报,56(24):1999-2005.
刁法启,熊熊,郑勇.2012.MW9.0日本Tohoku大地震静态位错模型:陆地GPS资料和海底GPS/Acoustic资料联合反演的结果[J].科学通报,57(18):1676-1683.
国家重大科学工程“中国地壳运动观测网络”项目组.2008.GPS测定的2008年汶川MS8.0级地震的同震位移场[J].中国科学:地球科学,38(10):1195-1206.
郝明,王庆良,崔笃信,等.2012.根据GPS和水准资料反演2008年汶川地震同震破裂模型[J].地震研究,35(3):323-329.
季灵运,刘传金,徐晶,等.2017.九寨沟MS7.0地震的InSAR观测及发震构造分析[J].地球物理学报,60(10):4069-4082.
万永革,王敏,沈正康,等.2004.利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布[J].地震地质,26(3):393-404.
王敏,李强,王凡,等.2011.全球定位系统测定的2011年日本宫城MW9.0级地震远场同震位移[J].科学通报,56(20):1593-1596.
王敏,张培震,沈正康,等.2006.全球定位系统(GPS)测定的印尼苏门达腊巨震的远场同震地表位移[J].科学通报,51(3):365-368.
杨国华,朱爽,梁洪宝,等.2015.芦山MS7.0级地震震前及同震地表形变[J].武汉大学学报(信息科学版),40(1):121-127.
杨少敏,聂兆生,贾志革,等.2011.GPS解算的日本MW9.0级地震的远场同震地表位移[J].武汉大学学报(信息科学版),36(11):1336-1339.
占伟,武艳强,梁洪宝,等.2015.GPS观测结果反映的尼泊尔MW7.8地震孕震特征[J].地球物理学报,58(5):1818-1826.
Bletery Q,Sladen A,Delouis B,et al.2015.A detailed source model for the MW9.0 Tohoku‐Oki earthquake reconciling geodesy,seismology,and tsunami records[J].Journal of Geophysical Research Solid Earth,119(10):7636-7653.
Plafker G.1965.Tectonic Deformation Associated with the 1964 Alaska Earthquake:The earthquake of 27 March 1964 resulted in observable crustal deformation of unprecedented areal extent[J].Science,148(3678):1675-1687.
Sun W,Okubo S,Fu G,et al.2010.General formulations of global coseismic deformations caused by an arbitrary dislocation in a spherically symmetric earth model-applicable to deformed earth surface and space‐fixed point[J].Geophysical Journal of the Royal Astronomical Society,177(3):817-833.
Wang C,Ding X,Shan X,et al.2012.Slip distribution of the 2011 Tohoku earthquake derived from joint inversion of GPS,InSAR and seafloor GPS/acoustic measurements[J].Journal of Asian Earth Sciences,57(6):128-136.
Wang R,Schurr B,Milkereit C,et al.2011.An Improved Automatic Scheme for Empirical Baseline Correction of Digital Strong-Motion Records[J].Bulletin of the Seismological Society of America,101(5):2029-2044.
Wang R,Parolai S,Ge M,et al.2013.The 2011 MW9.0 Tohoku Earthquake:Comparison of GPS and Strong-Motion Data[J].Bulletin of the Seismological Society of America,103(2B):1336-1347.
Wang W,Sun W,Wu Y,et al.2014.Modification of fault slip models of the MW9.0 Tohoku Earthquake by far field GPS observations[J].Journal of Geodynamics,75(4):22-33.
Wei S,Graves R,Helmberger D,et al.2012.Sources of shaking and flooding during the Tohoku-Oki earthquake:A mixture of rupture styles[J].Earth&Planetary Science Letters,333-334(6):91-100.
Wu Y,Jiang Z,Liang H,et al.2016.Coseismic deformations of the 2015MW7.8 Gorkha earthquake and interseismic strain accumulation in the Himalayan tectonic belt and Tibetan plateau[J].Tectonophysics,670:144-154.