[S-GD01] Geodesy and Global Geodetic Observing System

[SGD01-P02] Expansion of Mt. Fuji gravity observation network and observation results in 2023

*Ryo Honda¹, Yuichi Imanishi², Ryuichi Nishiyama², Takahito Kazama³, Tamaki Wakabayashi³, Kazunari Nawa⁴, Takuya Horikawa⁴, Hiroki Goto⁴, Ryuichi Ichikawa⁵, Hiroshi Ichihara⁶, Kenjiro Matsuhiro⁶, Kazumi Okada⁷ (1.MFRI, Yamanashi Pref. Gov., 2.ERI, the University of Tokyo, 3.Grad. School of Sci., Kyoto Univ., 4.GSJ, AIST, 5.NICT, 6.Earthquake and Volcano Research Center, Nagoya Univ., 7.ISV, Hokkaido Univ.)

Keywords:Gravity, Mt. Fuji, Volcano, Gravity Monitoring

The annual joint gravity measurement on the Mt. Fuji Gravity Observation Network was carried out in September 2023. As in previous years, we carried out absolute gravity measurements at the station MFRI and station SL5ST, as well as round-trip measurements by relative gravimeters at the same time. In addition, new experiments were carried out. For this measurement, a new observation station was installed inside Tsuru University Library.
The new observation station has a large gravity difference relative to station MFRI, making it convenient for various experiments. In addition, it can serve as an important reference gravity point, as it is extremely unlikely that gravity changes due to volcanic activity will occur during an eruption of Mt. Fuji. This presentation will provide an overview of the observation results in 2023.

We appreciate NIED for allowing us to operate their relative gravimeter CG-3M in our research.