利用Yabuki & Matsu′ura反演方法计算2011年日本东北地区太平洋海域M_w9.0级地震同震滑动分布
|
摘要
Yabuki&Matsu′ura反演方法是利用ABIC最佳模型参数选取方法和平滑的滑动分布作为约束条件,由形变观测数据计算发震断层滑动分布.本文基于日本列岛同震GPS观测数据和发震断层曲面构造模型,利用Yabuki&Matsu′ura反演方法计算2011年日本东北地区太平洋海域Mw9.0级地震的发震断层同震滑动分布.反演结果表明,断层面上的最大滑动量为35m,较大滑动分布在浅于30km的震源中心上部,最大破裂集中在20km深度的地方.其地震矩约为3.63×1022 N.m,对应的矩震级为Mw9.0.模拟结果显示Yabuki&Matsu′ura反演方法更适用于倾角低于40°的断层模型反演.最后,本文基于上述方法获得的发震断层滑动模型,利用地球体位错理论正演计算该地震在中国及其邻区产生的远场形变,正演计算结果基本可以解释由中国GPS陆态网络观测到的同震形变.
Yabuki&Matsu′ura′s inverse method is to find optimum model parameters from geodetic data,combining prior information of both the smoothness of fault slip and maximum likelihood method with Akaike′s Bayesian Information Criterion(ABIC).We apply Yabuki & Matsu′ura′s inverse method to estimate the co-seismic slip distribution of the 2011 Tohoku-Oki Mw9.0 earthquake on a curve fault model from GPS observation data.The estimated maximum slip is 35 m.The strong slips are delineated in an area with depth less than 30 km,shallower than the seismic focus.The biggest ruptures concentrate in an area with depth about 20 km.The total moment is about 3.63×1022 N·m.The corresponding moment magnitude is Mw9.0.Our simulation results confirm that the Yabuki & Matsu′ura′s inversion method is suitable for faults with dip angle less than 40°.Finally,we compute the far-field deformations in Northeast China of the 2011 Tohoku-Oki Mw9.0 earthquake using spherical dislocation theory of Sun et al..Our theoretical predictions agree well with the observed co-seismic displacement from China GPS Observation Network.
Yabuki&Matsu′ura′s inverse method is to find optimum model parameters from geodetic data,combining prior information of both the smoothness of fault slip and maximum likelihood method with Akaike′s Bayesian Information Criterion(ABIC).We apply Yabuki & Matsu′ura′s inverse method to estimate the co-seismic slip distribution of the 2011 Tohoku-Oki Mw9.0 earthquake on a curve fault model from GPS observation data.The estimated maximum slip is 35 m.The strong slips are delineated in an area with depth less than 30 km,shallower than the seismic focus.The biggest ruptures concentrate in an area with depth about 20 km.The total moment is about 3.63×1022 N·m.The corresponding moment magnitude is Mw9.0.Our simulation results confirm that the Yabuki & Matsu′ura′s inversion method is suitable for faults with dip angle less than 40°.Finally,we compute the far-field deformations in Northeast China of the 2011 Tohoku-Oki Mw9.0 earthquake using spherical dislocation theory of Sun et al..Our theoretical predictions agree well with the observed co-seismic displacement from China GPS Observation Network.
引文
[1]DeMets C,Gordon R G,Argus D F.Geologically currentplate motions.Geophysical Journal International,2010,181(1):1-80.
[2]Sagiya T.A decade of GEONET:1994-2003-The continuousGPS observation in Japan and its impact on earthquakestudies.Earth Planets and Space,2004,56:xxix-xli.
[3]Ozawa S,Nishimura T,Suito H,et al.Coseismic andpostseismic slip of the 2011 magnitude-9 Tohoku-Okiearthquake.Nature,2011,475(7356):373-376.
[4]Simons M,Minson S E,Sladen A,et al.The 2011magnitude 9.0 Tohoku-Oki earthquake:mosaicking themegathrust from seconds to centuries.Science,2011,332(6036):1421-1425.
[5]邵志刚,武艳强,江在森等.基于GPS观测分析日本9.0级地震同震位错与近场形变特征.地球物理学报,2011,54(9):2243-2249.Shao Z G,Wu Y Q,Jiang Z S,et al.The analysis ofcoseismic slip and near-field deformation about Japanese 9.0earthquake based on the GPS observation.Chinese J.Geophys.(in Chinese),2011,54(9):2243-2249.
[6]Iinuma T,Mako O,Yusaku O,et al.Coseismic slipdistribution of the 2011 off the Pacific coast of TohokuEarthquake(M9.0)estimated based on GPS data—Was theasperity in Miyagi-oki ruptured?Earth Planets Space,2011,63:643-648.
[7]Ito T,Kazuhiro O,Tsuyoshi W,et al.Slip distribution ofthe 2011off the Pacific coast of Tohoku Earthquake inferredfrom geodetic data.Earth Planets Space,2011,63(7):627-630.
[8]Miyazaki S,McGuire J J,Segall P.Seismic and aseismic faultslip before and during the 2011off the Pacific coast of TohokuEarthquake.Earth Planets Space,2011,63(7):637-642.
[9]Pollitz F.http://supersites.earthobservations.org/Politz_slip-results.jpg/[GPS slip model]
[10]Yabuki T,Matsu′ura M.Geodetic data inversion using aBayesian information criterion for spatial distribution of faultslip.Geophysical Journal International,1992,109(2):363-375.
[11]Okada Y.Surface deformation due to shear and tensile faultsin a half-space.Bulletin of the Seismological Society ofAmerica,1985,75(4):1135-1154.
[12]Sun W,Okubo S,Fu G,et al.General formulations ofglobal co-seismic deformations caused by an arbitrarydislocation in a spherically symmetric earth model-applicableto deformed earth surface and space-fixed point.GeophysicalJournal International,2009,177(3):817-833.
[13]Maruyama T.Statical elastic dislocation in an infinite andsemi-infinite medium.Bulletin of the Earthquakes ResearchInstitute,1964,42(1):289-368.
[14]Akaike H.Likelihood and the Bayes procedure.Trabajos deEstadisticay de Investigacion Operative,1980,31(1):143-166.
[15]Nakajima J,Hasegawa A.Anomalous low-velocity zone andlinear alignment of seismicity along it in the subducted Pacificslab beneath Kanto,Japan:Reactivation of subductedfracture zone?Geophysical Research Letters,2006,33(16):L16309.
[16]Nakajima J,Hirose F,Hasegawa A.Seismotectonicsbeneath the Tokyo metropolitan area,Japan:Effect of slab-slab contact and overlap on seismicity.Journal ofGeophysical Research,2009,114(B8):B08309.
[17]Kita S,Okada T,Hasegawa A,et al.Anomalous deepeningof a seismic belt in the upper-plane of the double seismic zonein the Pacific slab beneath the Hokkaido corner:Possibleevidence for thermal shielding caused by subducted forearccrust materials.Earth and Planetary Science Letters,2010,290(3-4):415-426.
[18]Yagi Y,Fukahata Y.Introduction of uncertainty of Green′sfunction into waveform inversion for seismic sourceprocesses.Geophys.J.Int.,2011,186(2):711-720.
[19]Hashimoto C,Noda A,Matsu′ura M.The Mw9.0northeastJapan earthquake:total rupture of a basement asperity.Geophysical Journal International,2012,189(1):1-5.
[20]Sato M,Ishikawa T,Ujihara N,et al.Displacement abovethe hypocenter of the 2011Tohoku-Oki earthquake.Science,2011,332(6036):1395.
[21]Koketsu K,Yokota Y,Nishimura N,et al.A unified sourcemodel for the 2011Tohoku earthquake.Earth and PlanetaryScience Letters,2011,310(3-4):480-487.
[22]Yokota Y,Koketsu K,Fujii Y,et al.Joint inversion ofstrong motion,teleseismic,geodetic,and tsunami datasetsfor the rupture process of the 2011 Tohoku earthquake.Geophysical Research Letters,2011,38:L00G21,doi:10.1029/2011GL050098.
[23]王敏,李强,王凡等.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.科学通报,2011,56(20):1593-1596.Wang M,Li Q,Wang F,et al.GPS measurements of co-seismic displacements at far field caused by the 2011magnitude 9.0 Tohoku-Oki earthquake.Chinese ScienceBulletin(in Chinese),2011,56(20):1593-1596.
[2]Sagiya T.A decade of GEONET:1994-2003-The continuousGPS observation in Japan and its impact on earthquakestudies.Earth Planets and Space,2004,56:xxix-xli.
[3]Ozawa S,Nishimura T,Suito H,et al.Coseismic andpostseismic slip of the 2011 magnitude-9 Tohoku-Okiearthquake.Nature,2011,475(7356):373-376.
[4]Simons M,Minson S E,Sladen A,et al.The 2011magnitude 9.0 Tohoku-Oki earthquake:mosaicking themegathrust from seconds to centuries.Science,2011,332(6036):1421-1425.
[5]邵志刚,武艳强,江在森等.基于GPS观测分析日本9.0级地震同震位错与近场形变特征.地球物理学报,2011,54(9):2243-2249.Shao Z G,Wu Y Q,Jiang Z S,et al.The analysis ofcoseismic slip and near-field deformation about Japanese 9.0earthquake based on the GPS observation.Chinese J.Geophys.(in Chinese),2011,54(9):2243-2249.
[6]Iinuma T,Mako O,Yusaku O,et al.Coseismic slipdistribution of the 2011 off the Pacific coast of TohokuEarthquake(M9.0)estimated based on GPS data—Was theasperity in Miyagi-oki ruptured?Earth Planets Space,2011,63:643-648.
[7]Ito T,Kazuhiro O,Tsuyoshi W,et al.Slip distribution ofthe 2011off the Pacific coast of Tohoku Earthquake inferredfrom geodetic data.Earth Planets Space,2011,63(7):627-630.
[8]Miyazaki S,McGuire J J,Segall P.Seismic and aseismic faultslip before and during the 2011off the Pacific coast of TohokuEarthquake.Earth Planets Space,2011,63(7):637-642.
[9]Pollitz F.http://supersites.earthobservations.org/Politz_slip-results.jpg/[GPS slip model]
[10]Yabuki T,Matsu′ura M.Geodetic data inversion using aBayesian information criterion for spatial distribution of faultslip.Geophysical Journal International,1992,109(2):363-375.
[11]Okada Y.Surface deformation due to shear and tensile faultsin a half-space.Bulletin of the Seismological Society ofAmerica,1985,75(4):1135-1154.
[12]Sun W,Okubo S,Fu G,et al.General formulations ofglobal co-seismic deformations caused by an arbitrarydislocation in a spherically symmetric earth model-applicableto deformed earth surface and space-fixed point.GeophysicalJournal International,2009,177(3):817-833.
[13]Maruyama T.Statical elastic dislocation in an infinite andsemi-infinite medium.Bulletin of the Earthquakes ResearchInstitute,1964,42(1):289-368.
[14]Akaike H.Likelihood and the Bayes procedure.Trabajos deEstadisticay de Investigacion Operative,1980,31(1):143-166.
[15]Nakajima J,Hasegawa A.Anomalous low-velocity zone andlinear alignment of seismicity along it in the subducted Pacificslab beneath Kanto,Japan:Reactivation of subductedfracture zone?Geophysical Research Letters,2006,33(16):L16309.
[16]Nakajima J,Hirose F,Hasegawa A.Seismotectonicsbeneath the Tokyo metropolitan area,Japan:Effect of slab-slab contact and overlap on seismicity.Journal ofGeophysical Research,2009,114(B8):B08309.
[17]Kita S,Okada T,Hasegawa A,et al.Anomalous deepeningof a seismic belt in the upper-plane of the double seismic zonein the Pacific slab beneath the Hokkaido corner:Possibleevidence for thermal shielding caused by subducted forearccrust materials.Earth and Planetary Science Letters,2010,290(3-4):415-426.
[18]Yagi Y,Fukahata Y.Introduction of uncertainty of Green′sfunction into waveform inversion for seismic sourceprocesses.Geophys.J.Int.,2011,186(2):711-720.
[19]Hashimoto C,Noda A,Matsu′ura M.The Mw9.0northeastJapan earthquake:total rupture of a basement asperity.Geophysical Journal International,2012,189(1):1-5.
[20]Sato M,Ishikawa T,Ujihara N,et al.Displacement abovethe hypocenter of the 2011Tohoku-Oki earthquake.Science,2011,332(6036):1395.
[21]Koketsu K,Yokota Y,Nishimura N,et al.A unified sourcemodel for the 2011Tohoku earthquake.Earth and PlanetaryScience Letters,2011,310(3-4):480-487.
[22]Yokota Y,Koketsu K,Fujii Y,et al.Joint inversion ofstrong motion,teleseismic,geodetic,and tsunami datasetsfor the rupture process of the 2011 Tohoku earthquake.Geophysical Research Letters,2011,38:L00G21,doi:10.1029/2011GL050098.
[23]王敏,李强,王凡等.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.科学通报,2011,56(20):1593-1596.Wang M,Li Q,Wang F,et al.GPS measurements of co-seismic displacements at far field caused by the 2011magnitude 9.0 Tohoku-Oki earthquake.Chinese ScienceBulletin(in Chinese),2011,56(20):1593-1596.
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