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Co-seismic Slip and Rupture of the 2011 Mw 9.0 Tohoku Earthquake from GPS and Sea-floor Point Observations

LI Zhicai1 ZHANG Peng1 WEN Yangmao2 LIAO Ying3(1 Geodesy Department,National Geomatics Center of China,1 Zizhuyuan,Baishengcun,Beijing 100048,China)(2 School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China)(3 Space Star Technology Co.Ltd.,82 Zhichun Road,Beijing 100086,China)  
The Mar 11th 2011 Tohoku earthquake(Mw=9.0) is located in northeastern of Japan.The surface observation data were rapidly obtained using the dense continuously GPS stations covered the island after the earthquake broking.In this paper,the reliable co-seismic deformation field is derived from GPS measurements using the highly precise data processing method and sea-floor points set near the epicenter.The co-seismic fault slip distributions are further inverted to explore the seismic mechanism using the steepest descent method to get the optimal solution.The second-order Laplace smoothing operator method had been used to constrain the fault slip amplitude based on the layered elastic half-space homogeneous model.The inversion results show that the energy released by the earthquake is about 4.48 × 1022 N·m equivalent to moment magnitude Mw 9.07.The average fault slip is about 6.05m while the maximum slip is about 58.7 m at 143.17 degrees east longitude and 38.25 degrees north latitude according the GPS and sea-floor points observed co-seismic deformation.The seismic fault characteristic is mostly thrust slip slide at the epicenter while some strike slip slide at the edge of faults.
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