和歌山県北部の隆起

Abstract

Imamura (1929) found an uplift between the Wakayama and Kainan cities in the northern Wakayama Prefecture based on leveling data. Yoshida et al. (2011) also found another uplift along the Kinokawa River, east of the Wakayama city. I reexamined leveling data from the first survey in the 1890’s to the latest one in this region and found that these two uplift episodes are not overlapped each other in space and time. Uplift found by Imamura was rapid till 1960’s and decelerated afterward. This deceleration may be correlated to the uplift at the Kainan Tide gauge station during early 1970’s - mid 1990’s. Area of uplift by Yoshida et al. had subsided till 1980’s and turned to rapid uplift then. Recent observations with InSAR reveal two spots of uplift in the Wakayama city and south of the Kinokawa River. These observations suggest that at least 5 episodes of uplift occurred in northern Wakayama Prefecture during 130 years.