Japan Geoscience Union Meeting 2021

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[J] Oral

S (Solid Earth Sciences ) » S-GD Geodesy

[S-GD01] Geodesy and Global Geodetic Observing System

Fri. Jun 4, 2021 10:45 AM - 12:15 PM Ch.22 (Zoom Room 22)

convener:Koji Matsuo(Geospatial Information Authority of Japan), Yusuke Yokota(Institute of Industrial Science, The University of Tokyo), Toshimichi Otsubo(Hitotsubashi University), Chairperson:Masahiro Nakashima(Geospatial Information Authority of Japan), Yuji ITOH(Earthquake Research Institute, The University of Tokyo)

10:45 AM - 11:00 AM

[SGD01-07] Absolute Gravity Measurements at Teshikaga in 2019 and 2020

*Yuichi Imanishi1, Ryuichi Nishiyama1, Kazunari Nawa2 (1.Earthquake Research Institute, The University of Tokyo, 2.AIST)

Keywords:absolute gravimeter, superconducting gravimeter, instrumental drift, Teshikaga

Absolute gravity measurements were conducted at the Teshikaga Observatory, Hokkaido University in 2019 and 2020, with the main purpose of providing temporal gravity changes for calibrating the instrumental drift of the Superconducting Gravimeter iGrav #17. Temporal drift of the Rubidium clock for the absolute gravimeter as well as an offset of the built-in barometer was also measured and taken into account in determining gravity acceleration. The final estimates of the mean gravity value at Teshikaga were 980 518 908.41 µGal (2019) and 980 518 906.56 µGal (2020).