【摘要】 对2009年4月6日意大利拉奎拉(LAquila)Mw6.3级地震9景ENVISAT重轨单视复数据采用双轨模式进行永久散射体(Persistent Scatterer,PS)处理,获得了此次地震时序位移场,结合PS位移场Delaunay算法数值分析,结果表明:1)Envisat干涉雷达完整而清晰地探测到了地震前后位移场变化过程及其在不同阶段与震源断裂相关的不同形变特征:震前蠕动位移-明显变形-震期快速突变-震后量级明显减缓的持续变形;2)在此次分析的约54×59km2区域内,震中以西为大面积上升区,视线向最大上升量为130mm;震中以东为下降区域,但下降集中在破裂区,主要在发震过程及震后形成,视线向最大下沉量为210mm,与GPS监测结果一致;3)地震产生的破裂主要分布在约22×14km2范围内,沿NW走向、SW倾斜的Paganica-S.Demetrio正断层展布,方向约135°;4)本文为探索利用PSInSAR时间序列进行地震趋势预测提供了一个较好的案例.更多还原

【Abstract】 Using 9 SLC Envisat ASAR images,time series of differential interferograms and consequent co-seismic deformation field of the L’Aquila earthquake(Mw6.3 on 6 April 2009) are obtained by PSInSAR method.Furthermore,deformation processes of rupture zone are numerically analyzed by using Delaunay triangulation algorithms based on above results.The results showed that: 1)Envisat ASAR detected clearly the process of displacement field with time variation and the different deformation characteristics associated with source rupture: creep displacement before the earthquake-obvious deformation-rapidly change during the shocking-continuous deformating of significantly slowing down after shocking.2)In area covered about 54×59 km2,westward of epicenter shows uplift with maximum capacity of 130 mm in the LOS,and east of epicenter was subsidence region.But the head settlement capacity was in rupture zone,and its majority formed in the course of shocking and subsequence.The maximum settlement reached 210 mm in LOS,consisting with GPS measurements.3)Tthe strongest deformation and surface faulting within zone about 22×14 km2,with an orientation of 135°,occurred along the NW striking and SW dipping Paganica-S.Demetrio normal fault;4) The works from this paper have provided a comprehensive case for digging methods for earthquake forecasting with time series PSInSAR.更多还原