Seasonal and Secular Changes of Gravity at Teshikaga, Eastern Hokkaido, Japan, Estimated from Two-Year Superconducting Gravimeter Data
Seasonal and Secular Changes of Gravity at Teshikaga, Eastern Hokkaido, Japan, Estimated from Two-Year Superconducting Gravimeter Data
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根据两年超导重力计数据估算的日本北海道东部弟子屈重力的季节性和长期变化
DOI：
10.11366/sokuchi.66.16
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发表时间：
2020
影响因子：
--
通讯作者：
名和 一成
中科院分区：
文献类型：
--
作者：
山佳 典史;名和 一成
为了调查日本北海道东部库沙罗破火山口周围的长期重力变化，分析了自2018年11月以来在北海道大学手贺天文台连续观测的超导重力仪（iGrav# 17）的数据。通过分析观测开始后703天的数据，发现了重力变化的特征，在积雪增加期间逐渐减少，在融雪期间急剧增加。这种重力变化主要可以用地下土壤含水量变化的影响来解释，但要量化这种影响的数量，就需要在冬季停止从积雪底部渗入土壤的降水和积雪质量的吸引作用。从观测中去除本研究中模拟的陆地-水重力变化显示重力增加，但长期重力变化率及其原因的量化仍是未来的研究。
To investigate long-term gravity changes around the Kussharo Caldera in eastern Hokkaido, Japan, data from the superconducting gravimeter (iGrav# 17), which has been continuously observed at the Teshikaga Observatory of Hokkaido University since November 2018, were analyzed. As a result of analyzing the data over 703 days from the start of the observation, a characteristic gravity change was detected, with a gradual decrease during the period of increasing snow cover and a sharp increase during the snowmelt period. This gravity change can be explained mainly by the effect of subsurface soil water content changes, but to quantify the amount of the effect, the stopping of infiltration of precipitation from the bottom of the snow cover into the soil and the attraction effect of the mass of snow cover are required during the winter months. Removing the land-water gravity change modeled in this study from the observations shows a gravity increase, but quantification of the rate of secular gravity changes and its cause remains a future study.