【摘要】 利用中国大陆GPS连续观测站资料,获取了2011年3月11日日本9.0级地震造成的连续站同震位移。计算结果表明,位于我国东部尤其是东北地区的台站在水平方向都有明显的同震位移,且离震中越近同震位移量越大,其中绥阳站的水平同震位移量最大,达到33mm。通过对时间序列分析发现,有明显同震位移的连续站,震前水平方向的运动速度都有放缓的趋势,可能是一种形变前兆现象。这些GPS观测到的同震位移及震前运动速度异常,对于进一步研究前兆地壳运动、地震动力学特征以及精化中国大陆地壳运动速度场都有重要意义。更多还原

【Abstract】 We calculated coseismic deformations at fiducial stations in China caused by the 2011 M9.0 Japan Earthquake.The results show that there are obvious coseismic displacements at stations located in the east,especially northeast of China,and the coseismic displacements are in directly proportional to the epicentral distance.The coseismic displacement at the SUIY station is the largest,3.3 cm.A phenomenon is found in the time series that the speed of horizontal movements at the fiducial stations with obvious coseismic displacement decreased before the earthquake,and this phenomenon might be one of the earthquake precursors.Coseismic displacements and abnormal speed of movement before the earthquake collected by GPS data will be of profound significance for the study of predictive crustal movement,kinetic characteristics of earthquake and the crust velocity field in mainland China.更多还原