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测绘学报  2014 

汶川地震前后四川盆地CORS站运动特性分析

, PP. 582-589

Keywords: 汶川地震,CORS,震后形变,闭锁

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Abstract:

为探讨四川盆地在汶川地震前后地壳运动的规律,本文对2006年3月至2012年9月四川12个连续运行参考站(ContinuouslyOperatingReferenceStations,CORS)6年多的观测资料进行了详细的处理和分析。通过比较震前震后CORS站运动的相似性和差异性发现由于震后形变的影响,震后第一主成分(PrincipleComponentFirst,PC1)的贡献率下降20%~40%;震后多站的速度场发生了明显的变化,突出表现在PIXI,CHDU,MYAN等站,YAAN,QLAI站处于闭锁状态;盆地垂直分量的周年振幅在震前一年偏大,震后逐年减小。以上发现表明汶川地震可能改变了四川盆地原有的运动特性。

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