10:45 AM - 12:15 PM
[STT40-P04] Possibility of Magnetization Structure Analysis in Marine Volcanoes Using Aeromagnetic Database of Japan
Keywords:magnetic inversion analysis, Aeromagnetic Database of Japan
In 2005, National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan (GSJ), compiled and integrated the aeromagnetic survey data collected in the 1970s~90s, and published the "Aeromagnetic Database of Japan". This database includes both magnetic anomaly data and magnetic anomaly maps, and covers almost Japan island and its surrounding areas. With the application of the altitude reduction, the magnetic anomaly data in this database is considered to reflect a long-wavelength anomaly, and thus, contains the information about the subsurface large-scale structure.
Since the 2010s, there have been cases of eruptions at sea-area volcanoes near Japan, such as Nishinoshima Island and Fukutokuokanoba volcano. Since structural analysis of such sea-area volcanoes requires a lot of preparation and expense, it is difficult to conduct surveys at all sea-area volcanoes in a short period of time.
Therefore, it would be useful to understand the large-scale structure using wide-area data such as the Japan Aeromagnetic Database in order to evaluate the eruption risk and to determine the priority of investigations. In this study, we are working on magnetization structure analysis in Kikai caldera, a large submarine caldera located to the south of Kyushu Island, Japan. In this presentation, we will introduce the progress in the process, and discuss what information of the subsurface structure can be obtained from the analysis of the anomaly data in the Aeromagnetic Database of Japan.
Since the 2010s, there have been cases of eruptions at sea-area volcanoes near Japan, such as Nishinoshima Island and Fukutokuokanoba volcano. Since structural analysis of such sea-area volcanoes requires a lot of preparation and expense, it is difficult to conduct surveys at all sea-area volcanoes in a short period of time.
Therefore, it would be useful to understand the large-scale structure using wide-area data such as the Japan Aeromagnetic Database in order to evaluate the eruption risk and to determine the priority of investigations. In this study, we are working on magnetization structure analysis in Kikai caldera, a large submarine caldera located to the south of Kyushu Island, Japan. In this presentation, we will introduce the progress in the process, and discuss what information of the subsurface structure can be obtained from the analysis of the anomaly data in the Aeromagnetic Database of Japan.