2011年东日本大地震对中国东北地区地壳变形的持续影响

Persistent Impact of the 2011 Tohoku-Oki Earthquake in Japan on Crustal Deformation in Northeast China

实际监测与理论研究均表明, 2011年东日本大地震对中国东北地区地壳变形产生了显著的影响。然而,对震后影响的持续时间却存在着不同的看法,有的学者依据所掌握的资料认为即使受影响最大的东北地区其持续时间截止于2013年上半年等。针对这一问题,本文对中国地壳运动观测网络2016年前的多期复测资料进行了处理与分析,结果表明:这种影响不仅存在,而且仍是目前东北地区时段性地壳变形的主体成分,仅是随着时间的推移呈现逐渐减弱的态势。因此,推测震后影响至少在今后数年内仍将存在。

Based the monitoring result and theoretical study,we find that the impact of the 2011 Tohoku-Oki earthquake in Japan on crustal deformation of Northeast China is prominent.However,there are different opinions about persistent time of the earthquake impact.Some scholars consider that the earthquake impact will be expired in May 2013 according to the observation of present in-situ absolute crustal stress,etc.For this problem,we combined with repeated observations in different epochs of GNSS before 2016,re-studied the above issues fully.The result suggests that such impact will not only exist,but also dominate crustal deformation in Northeast China.It just shows a gradual weakening trend with time increasing.Therefore,the distinct adjustment will persist and be discernable at least in a few years.