Fig. 3. Horizontal displacements estimated from the 1998 and 1999 GPS
survey. They are calculated with respect to Kamikawa (GSI) station and
indicated by arrows. Principal horizontal-strains from the displacements
are also shown by solid and broken lines, respectively. Kamikawa GPS
station of Geographical Survey Institute of Japan is plotted by a square,
where we have used as the reference site.