Abstract
The crustal movement associated with earth quake swarm activity of Hakone volcano from June 12 to the end of November, 2001 was detected by EDM network installed by the Hot Springs Research Institute of Kanagawa Prefecture. Although significant change was not recognized so much from the raw trend, subtraction of aver aged seasonal change from observed EDM trend allowed detecting of inflation for about 2.5 months at the beginning of the earthquake swarm. This trend was consistent with observations of GPS, tilt meter and distortion meter. Our EDM analysis also detected contraction tendency of the volcano about 2.5 months after the beginning of the earthquake swarm. The reason of this trend is still equivocal but could be caused by regional and shallow deformation.
