云南地区近期地壳活动特征

Recent Tectonic Activity Features of Yunnan Region

基于云南省的GNSS连续观测资料,通过最小二乘、克里金插值等方法进行速度场、应变参数的求解,获得了自2010年起至今云南地区的地壳活动特征。结果表明,云南地区最大剪应变变化速率存在西强东弱,北强南弱的特征,目前滇西北地区最大剪应变增强最快,滇南至滇西南等区域挤压应变积累最明显,且2011年缅甸7.2级地震的发生未改变这一地区的应变积累趋势。

Based on the GNSS continuous observation data in Yunnan,we get the velocity field and strain parameters by the least square and Kdging interpolation methods etc.and obtain the characteristics of crustal movement in Yunnan since 2010.The result shows that the maximum rate of shear strain in north Yunnan is stronger than that in the south,and stronger in west Yunnan than that in the east.The maximum shear strain increased rapidly in Northwest Yunnan.The regional compressive strain accumulation is obvious in South and Southwest area,and the trend of it is not affected by the Myanmar M7.2 earthquake in 2011.