By simultaneous observations of ionospheric total electron content depletions associated with amplitude scintillations at three spaced locations on Taiwan Island, the poleward and eastward zonal drift motions of the total electron content depletions have been investigated. Using the data observed during January 1986 to December 1988, it has been found that the most probable poleward drift velocity ranges from 26 m/s to 71 m/s with a mean velocity of 45 m/s, and the most probable eastward zonal drift velocity ranges from 64 m/s to 130 m/s with a mean velocity of 97 m/s. Both poleward and zonal drift velocities decrease from early evening to presunrise hours. ¿ American Geophysical Union 1990