Abstract
Afterslip of the 1978 Off-Miyagi Prefecture Earthquake occurred in June 12 1978, which was originally detected by a seismologist using coastal sea level data, is reanalyzed by means of different detection procedures. Time series of sea level difference between two tidal stations shows the short period variations which seem to be oceanic origin. It is found that in order to obtain the plausible crustal movement, the median filter with the window of several ten days to a hundred days is appropriate. In the coastal sea level data, mixed signals of oceanic variations and crustal movements exist, and in order to precisely detect each of them as much as possible, close collaboration between the researchers of both fields should be done in future.
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