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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: 超伝導重力計で観測された重力季節変化のモデル化
Other Titles: Modeling of seasonal gravity changes observed with a superconducting gravimeter
Authors: 丸藤, 大樹1 Browse this author
名和, 一成2 Browse this author →KAKEN DB
高橋, 浩晃3 Browse this author →KAKEN DB
Authors(alt): Marufuji, Taiki1
Nawa, Kazunari2
Takahashi, Hiroaki3
Issue Date: 26-Mar-2023
Publisher: 北海道大学大学院理学研究院
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 86
Start Page: 13
End Page: 21
Abstract: Continuous gravity observation with iGrav superconducting gravimeter (#17) was carried out at the Teshikaga, eastern Hokkaido, from November 2018 to August 2022. Gravity timeseries with correction of tides, atmospheric pressure change, and polar motion indicated characteristic seasonal gravity changes from winter to spring in each year. Rate of gravity increases in the early spring in 2021 and 2022 were smaller than those in 2019 and 2020. The G-WATER[1D] software (Kazama et al., 2012) was applied to estimate the gravity change associated with underground water mass variation due to precipitation, snow cover and melting. Calculated gravity changes using parameters supposed by Yamaga and Nawa (2020) could not explain the above differences. Optimal parameters associated with infiltration process of snowmelt water and the saturated hydraulic conductivity of the soil were searched by try and error. As a result, gradual snowmelt infiltration process with an approximately one-order larger hydraulic conductivity could well explain the 4-time seasonal gravity change observed in winter to early spring.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第86号

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