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Geological information is essential for a country like Japan, located at a tectonically active area, to ensure a safe and secure society. The Geological Survey of Japan gathers, compiles, and provides geological information and promotes its wider use. We also develop technologies to overcome various difficulties related to global environment protection, exploration of minerals and energy resources, and natural disaster mitigation, and coordinate international cooperation as a national representative.
Many slow earthquakes occurred in the Nankai Trough. AIST calculated stress orientations within the Philippine Sea plate, investigated directions of fluid migration, and clarified that slow earthquakes occur as a result of fluid accumulating in the mantle below the Eurasian plate.
Schematic figure showing the orientation of fluid migration (left) and the stress orientations during the earthquakes and the orientation of fluid flow in the rock (right).
Water environment maps of two new areas and the previously published water environment maps of four areas have been published on the website of AIST. In addition, the results of wide area groundwater flow survey have also been published as the Groundwater Database for Japan.
Concept of newly published “groundwater maps” (water environment maps)
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