Abstract
The precise leveling on a small-aperture leveling net at Yake-dake volcano has been repeated almost every autumn since 1977. The net consists of ten bench marks with a total length of 520m. Geodetic tilt vectors, each calculated from elevation changes at three neighboring bench marks, are grouped on the basis of directions and sizes of vectors. Tilt vectors calculated from northeastern bench marks of the leveling net show a dip of about 1200μ rad towards north, and the others calculated from southwestern bench marks show 200μ rad dipping northwards at an average. The two geodetic tilt vectors suggest a relative upheaval of the summit on Yake-dake volcano since 1977.
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