Earth Planets Space, Vol. 52 (No. 11), pp. 1019-1021, 2000LETTER
Takayuki Kaneso1, Junji Koyama1, Takeo Moriya1, and Hiroaki Takahashi2
1Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, North 10 West 8, Kitaku, Sapporo 060-0810, Japan
2Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, North 10 West 8, Kitaku, Sapporo 060-0810, Japan
(Received December 31, 1999; Revised July 16, 2000; Accepted August 15, 2000)
Abstract: To investigate the precise crustal deformation in the Taisetsu mountains, Central Hokkaido, Japan, we have conducted GPS survey in 1998 and 1999. The coordinates at summit peaks of the mountain chain, horizontal displacements and strain are evaluated in this period. Major results are summarized as (1) horizontal displacements at the summit peaks are about 2 cm in the direction of north, (2) horizontal strain is estimated to be compressional in the NW-SE direction. Although the precision of the estimates awaits for the future survey, this results are consistent with the direction of the compressional axes of focal mechanism solutions of local earthquakes in the surrounding region and with the deformation vector by the triangulation in central Hokkaido.