利用GPS观测反演Tokachi-Oki地震(日本)及强余震的同震滑移分布
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摘要
根据GPS观测的Tokachi-Oki地震及强余震引起的地表位移,采用基于敏感性探测的方法反演了两次地震分别引起的断层滑移。反演过程中,考虑了更切合实际的分层地球模型和断层面几何形状。主震和强余震滑移量的最大值分别为3.07m和0.33m,相应的矩震级分别为Mw7.94和Mw7.1,与地震波形反演的结果基本一致。另外,从主震和强余震的滑移分布来看,强余震的滑移主要分布在主震破裂较小的区域,一种合理的解释是,主震的破裂过程增加了邻区断层面上的能量积累,导致了强余震的发生。
With the observed GPS coseismic displacements of Tokachi-Oki Earthquake and its biggest aftershock,we derive the coseismic slip distributions of the two earthquakes using SBIF(sensitivity-based iterative fitting)method.A more real fault geometry and layered Earth model were considered in the inverted process.As results shown,the maximal slips of the main shock and the biggest aftershock are 3.07 m and 0.33 m respectively.The corresponding moment magnitude scale are Mw 7.94 and Mw 7.1,which is consistent with the seismic result.In addition,the slip of the aftershock is mainly located at the place the coseismic slip of the main shock is lower,which perhaps indicate that the stress of surrounding region is enlarged by the coseismic slip of the main shock and thus trigger the biggest aftershock.
With the observed GPS coseismic displacements of Tokachi-Oki Earthquake and its biggest aftershock,we derive the coseismic slip distributions of the two earthquakes using SBIF(sensitivity-based iterative fitting)method.A more real fault geometry and layered Earth model were considered in the inverted process.As results shown,the maximal slips of the main shock and the biggest aftershock are 3.07 m and 0.33 m respectively.The corresponding moment magnitude scale are Mw 7.94 and Mw 7.1,which is consistent with the seismic result.In addition,the slip of the aftershock is mainly located at the place the coseismic slip of the main shock is lower,which perhaps indicate that the stress of surrounding region is enlarged by the coseismic slip of the main shock and thus trigger the biggest aftershock.
引文
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[13]Reilinger R E,Ergintav S,Bürgmann R,et al.Coseismic and Postseismic Fault Slip for the17August1999,M=7.5,Izmit,Turkey Earthquake[J].Science,2000,289:1519-1524
[14]Hsu Y J,Bechor N P,Segall S B,et al.Rapid Afterslip Following the1999Chi-Chi,Tai wan Earthquake[J].Geophys Res Lett,2002,29(16):1-4
[15]Miyazaki S,Segall P,Fukuda J,et al.Space Time Distribution of Afterslip Following the2003Tokachi-Oki Earthquake:Implications for Variations in Fault Zone Frictional Properties[J].Geophys Res Lett,2004,31:623-627
[16]李志才,许才军,张鹏,等.基于地壳分层的地震断层同震变形反演分析[J].武汉大学学报.信息科学版,2008,33(3):229-232
[2]Miyazaki S,Larson K M.Coseismic and Early Postseismic Slip for the2003Tokachi-Oki Earthquake Sequence Inferred from GPS Data[J].Geophys Res Lett,2008,35:302-305
[3]Larson K M,Miyazaki S.Resolving Static Offsets from High-Rate GPS Data:the2003Tokachi-Oki Earthquake[J].Earth Planets Space,2008,60:801-808
[4]Yagi Yuji.Source Rupture Process of the2003Tokachi-Oki Earthquake Determined by Joint Inversion of Teleseismic Body Wave and Strong Ground Motion Data[J].Earth Planets Space,2004,56:311-316
[5]Yamanaka Y,Kikuchi M.Source Process of the Recurrent Tokachi-Oki Earthquake on September26,2003,Inferred from Teleseismic Body Waves[J].Earth Planets Space,2003,55:21-24
[6]Tanioka Y,Hirata K,Hino R,et al.Slip Distribution of the2003Tokachi-Oki Earthquake Estimated from Tsunami Waveform Inversion[J].Earth Planets Space,2004,56:373-376
[7]Miyazaki S,Larson K M,Choi K,et al,Modeling the Rupture Process of the2003September25Tokachi-Oki(Hokkaido)Earthquake Using1-Hz GPS Data[J].Geophys Res Lett,2004,31:603-607
[8]Ozawa S,Kaidzu M,Murakami M,et al.Coseismic and Postseismic Crustal Deformation After the Mw8Tokachi-Oki Earthquake in Japan[J].EarthPlanets Space,2004,56:675-680
[9]Chen Ji,Hel mberger D V,Song A T,et al.Slip Distribution and Tectonic Implication of the1999Chi-Chi,Tai wan,Earthquake[J].Geophys Res Lett,2001,28(23):4379-4382
[10]Kei K,Wada N,Kashara M.Newly Imaged Shape of the Deep Seismic Zone Within the Subducting Pacific Plate Beneath the Hokkaido Corner,Japan-Kurile Arc-Arc Junction[J].J Geophys Res,2003,108(B12):2565
[11]Wang R,Xia Y,Grosser H,et al.Das2003Bam Erdbeben:Prazise Herdparameterbestimmung mit Hilfe der Differentiellen Radar-Interferometrie[R].Zweijahresbericht,GeoForschungsZentrum Potsdam,Germany,2006
[12]Wang R,Motagh M,Walter T R.Inversion of Slip Distribution from Co-seismic Deformation Data by a Sensitivity-Based Iterative Fitting(SBIF)Method[C].EGV General Assembly,Vienna,2008
[13]Reilinger R E,Ergintav S,Bürgmann R,et al.Coseismic and Postseismic Fault Slip for the17August1999,M=7.5,Izmit,Turkey Earthquake[J].Science,2000,289:1519-1524
[14]Hsu Y J,Bechor N P,Segall S B,et al.Rapid Afterslip Following the1999Chi-Chi,Tai wan Earthquake[J].Geophys Res Lett,2002,29(16):1-4
[15]Miyazaki S,Segall P,Fukuda J,et al.Space Time Distribution of Afterslip Following the2003Tokachi-Oki Earthquake:Implications for Variations in Fault Zone Frictional Properties[J].Geophys Res Lett,2004,31:623-627
[16]李志才,许才军,张鹏,等.基于地壳分层的地震断层同震变形反演分析[J].武汉大学学报.信息科学版,2008,33(3):229-232
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