Detection of Precise Geoidal Height by GPS in and around Sakurajima Volcano and a Consideration on its Time Variation.
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概要
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Precise geoidal height by GPS was detected in and around Sakurajima volcano. First, in this research, a temporal change ∂N in the geoidal height, which is, in some cases, induced by a large ejection from magma reservoir, is introduced by developing a new conversion formula without gravity data and Stokes' integral. The temporal change in the geoidal height is determined from ∂h-∂H, where, ∂h and ∂H are temporal changes of the ellipsoidal and orthometric heights, respectively. ∂h and ∂H are detected by GPS and levelling or triangulation surveys carried out at the same time and on the same period, respectively. Second, the undulation pattern of the geoidal height which was related to the past magma ejection was precisely detected by GPS using the triangulation and the leveling points data in and around Sakurajima Volcano considering ∂N =0. This result agrees well with the profile of the volcanic underground structure determined from gravity anomaly. Including this, geoidal undulationgap was detected between the eastern part of Kagoshima City and Sakurajima Volcano, which suggests a graben-like normal fault pattern having a steep slope structure of the basement rocks. Third, recent time-variation of the geoidal height in Sakurajima Volcano was estimated, comparing with that in the case of the 1914 great eruption of Sakurajima from the standpoint of long term prediction of the volcanic eruption, including the final recovery phase.
- 日本測地学会の論文
日本測地学会 | 論文
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