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基于GPS速度场变化结果研究汶川地震前后南北地震带地壳运动动态特征

DOI: 10.6038/cjg20150512, PP. 1597-1609

Keywords: QUAD,GPS速度场,速度场差值变化,汶川地震,最小二乘配置

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Abstract:

本文针对制约多期GPS速度场动态演化特征分析的关键问题,提出速度场稳定基准选取中顾及基准偏移的影响,给出了改进拟准检定(QUAD)初选指标的方法,有效解决多期速度场的基准偏移对粗差剔除的影响.并在此基础上通过对1999—2013年南北地震带地区多期GPS速度场做以华南地块为统一参考基准的处理、最小二乘配置统一协方差参数估算,获取了南北带地区多期GPS速度场的网格化结果.结果显示:(1)汶川地震影响在震后迅速衰减;震前2004—2007年及2007—2009年相对于1999—2004年南北地震带地区中北部地区存在大范围的北东向运动增强.(2)2007—2009年相对于2004—2007年的速度场差值变化图像显示,这期间汶川地震的调整影响范围较大,鲜水河左旋剪切有所减弱,龙门山南段应变积累增强.(3)川滇块体南东向的挤出滑移在2011—2013年相对2009—2011年有所增强.

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