【摘要】 根据南极半岛地区50年以来发生的9次MW>5级的地震机制解资料,利用Kostrov公式计算了地震主应变率及主应变率的方向,利用SCAR国际GPS会战数据得到的GPS速度场资料在椭球面上进行计算得到了南极半岛的最大剪应变率、主应变率、面膨胀率等应变率状态参数;经过综合分析初步得到了南极半岛地区现今的形变特征,认为南极半岛地区的应变率状态以拉张为主,压缩为辅,结合地质构造资料认为该地区近期发生大震的可能性不大.更多还原

【Abstract】 According to the document of seismic mechanism of which nine seismics are larger than five during the last fifty years in Antarctic Peninsula,the seismic principal rates of stresses and their orientations are given with Kostrov formulation.The principal rates of shear stresses and bulks are also given after the velocities of GPS from international GPS campaign being processed on reference ellipsoid.When data are carefully examined and analyzed,the conclusions show that the principal rates of stresses are mainly extensional but not compressible.It seems that large seismic would not happen in a not long future in Antarctic Peninsula.更多还原