图15　通海7．7级地震震区各时段地面垂直形变曲线

      (1969-1958,1970-1969,1977-1969)

Fig．15  Curves of curstal vertical deformation in different period of the

        Ｍ 7．7   Tonghai earthquake

        (a)剖面图; (b)20-22点位间高程变化