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《Chinese Journal of Geophysics》 2012-01
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Source parameters of the 2009 L′Aquila earthquake,Italy from Envisat and ALOS satellite SAR images

WEN Yang-Mao,HE Ping,XU Cai-Jun,LIU Yang School of Geodesy and Geomatics,Wuhan University,Wuhan,Hubei 430079  
On the 6th April 2009,an Mw6.3 earthquake occurred in the region of L′Aqula of Italy,which caused more than 300 people to lose their lives.In this paper,the Envisat and ALOS satellite interferograms with different incidences and wavelengths are used to invert for the source parameters of the fault activated during the earthquake.Firstly,two-pass interferometry technique is used to obtain the coseismic deformation covering the whole epicenter region,then a combination method of quad-tree and uniform sample is employed to down-sample the original observed datasets.Secondly,the rectangle and triangle dislocation models in elastic half-space and an automated fault discretization method are used to derive the geometric and kinematic characteristic of fault combining with GPS surface displacement measurements.The best-fit solution shows that the distributed slip model can explain the data very well.The inversion result indicates that the fault is dominated by normal movement with small right-lateral strike-slip component.The shortest and longest length of the optimal fault patches based on the observing data are 0.4 km and 6.3 km,respectively.The fault slip concentrates mainly in the shallow depth between 5 km and 14 km,and the maximum slip is about 1.07 m.The inverted geodetic moment is 3.43×1018 N·m(Mw6.32),which is excellently consistent with the result of seismology.
【Fund】: 国家863计划资助项目(2009AA12Z317);; 国家自然科学基金项目及创新群体项目(40874003 41074007 41021061);; 国家公益地震行业科研专项(200808080);; 武汉大学中央高校基本科研业务费专项资金科研项目(3101036 114035);; 高等学校博士学科点专项科研基金科研项目(20090141110055 20100141120033)资助
【CateGory Index】: P228
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