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Figure 2: GPS data at Ojika
Figure 4: GPS data at Minami Torishima
Figure 3: GPS data at Mt. Fuji
Figure 5: Daily change of distance between Ojika and Minami Torishima
M 9.0?) occurred in the Nankai Trough.
Therefore many Japanese concern the
possibility of eruption of Mt. Fuji after
such huge earthquake this time. As there is
only one GPS station in Paci c Plate, the
crustal movement of GPS station of Minami
Torishima would be interesting. Figure
1 shows the location of the three GPS
stations of interest and also the four Plates.
Figure 2 shows the pre-signals of GPS
data at Ojika GPS Station while Figure
3 shows the pre-signals of Mt. Fuji GPS
Station. X, Y, Z and H (ellipsoid height)
of GPS station are shown. If carefully
watched, the movement of H shows
abnormal pre-signals of more than 2 cm
at Ojika on the 25 th February 2011 and 8 th
March 2011 before the great earthquake.
Similarly Mt. Fuji shows abnormal presignals
on the 24 th and 26 th February
2011 and the 8 th March 2011. It would
be obvious that such pre-signals will
provide very useful information about
the prediction of huge earthquakes in
future. GPS data at Minami Torishima
(means by south bird island or Marcus
Island in English) located 1,800 km
from the mainland of Japan which
is on the Paci c Plate shows similar
movement with Ojika and Mt. Fuji as
shown in Figure 4. On the 7 th and 8 th
March 2011 just 4 and 3 days before
the earthquake showed some sort of
abnormal movement in H. Figure 5 and
Figure 6 shows the daily change of the
distance between Minami Torishima and
Ojika and between Minami Torishima
and Mt. Fuji. Figure 7 shows the daily
change of the triangle area connecting
Ojika, Mt. Fuji and Minami Torishima.
Crustal movement after the
Great East Japan Earthquake
Drastic crustal movement continued
almost a half year after the earthquake,
by which Geo-spatial Information
Authority (GSI) could not x the
coordinates of geodetic control points in
Japan before the end of October 2011.
Figure 8 shows the horizontal movement
after the great earthquake which
was analyzed by GSI. 5.3 meters in
Coordinates May 2012 | 9