（小林昭夫・吉田明夫, 2004, 測地学会誌, 50, 39-42.）
We investigated crustal deformation after the 1946 Nankai earthquake using tide gauge records.
Although resolution of tide gauge records is not so high for seeing the temporal change in detail,
vertical crustal movements whose relaxation times are between several months to years can be detected
by them. It was reported that there had been a postseismic crustal deformation with a time
constant of 4-5 months in southern Kui Peninsula (Kobayashi et al., 2002). In this paper we show
that crustal deformations with a longer relaxation time of a few years were observed in northern
Shikoku, examining tide gauge records at such stations as Takamatsu, Sumoto and Kobe. These
observations suggest that there was a time lag in the development of postseismic slip between shallow
and deeper parts on the plate interface after the Nankai earthquake.