首页> 中文期刊> 《地震学报》 >2008年汶川地震震源区东北端局部形变区与青川Ms6.4强余震关系

2008年汶川地震震源区东北端局部形变区与青川Ms6.4强余震关系

         

摘要

2008年汶川地震之后,通过InSAR观测到青川县木鱼镇附近存在一个长约为15 km、宽约为10 km、地表位移数十厘米的局部形变区.前人分析认为,该形变区是由Ms6.4的青川强余震造成的,但拟合地表形变数据所采用的震源深度和震源机制解与地震学反演的结果具有较大差异.本文利用远震体波和瑞雷波振幅谱进一步测定了青川强余震的震源深度和震源机制解,计算了此次事件造成的地表位移场,认为青川强余震并非造成木鱼镇地区局部形变的直接原因,并讨论该局部形变区可能的成因.%A localized deformation zone near Muyu town of Qingchuan county was observed on the InSAR interferograms of the great 2008 Wenchuan earthquake.The Muyu deformation zone was about 15 km long and 10 km wide,with line of sight displacement up to dozens of centimeters.Some researchers proposed that the deformation zone is caused by a strong aftershock (Mw6.1) in Qingchuan county on May 25,2008,and they adopted seismic source parameters very different from seismic inversions.To verify reliability of the seismic source inversions,we use teleseismic body wave and local Rayleigh wave spectra to constrain focal depth and fault plane of the strong aftershock.Thereafter,we compute ground displacement and proposed that the aftershock was not the direct cause of the localized deformation zone.Then we discuss some candidate mechanisms which might explain the localized deformation.

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