Vol.9 No.2 2016
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−116−Synthesiology - English edition Vol.9 No.2 (2016) Letter from the editorWe deliver four papers in this issue that focuses on “geological surveys.” The subject of “geological surveys” is subsurface geoinformation. The Japanese Archipelago is located on one of the most geologically active mobile belts in the world, and many geological disasters such as earthquakes, volcano eruptions, and landslides occur. Also, subsurface geoinformation is essential for land development, environmental protection, and infrastructure construction. Although geoinformation is very important, it is impossible to directly see beneath the ground, and the Government must organize its geoinformation as a national effort to build a safe and wealthy nation.Unlike other research fields, “geological surveys” do not directly lead to industrial promotion or product development. However, the quality and availability of geoinformation are important as knowledge that links directly to the safety of society and sustainable development, from the perspectives of land development, environmental protection, infrastructure construction, and measures against geological disasters. There is a term jitsugaku or practical science, which is an academic discipline whose objective is actual practice, and geology is such a discipline that is closely linked to society. Therefore, from this perspective, we collected the papers on “geological surveys.”In the paper on geochemical reference materials, the development of reference materials and AIST’s superior position as a research institute of geology are presented. In the paper on a 3D geological map, a new proposal is made to society on earthquake disaster prevention and mitigation. In the paper on microtremor arrays, timely response is given to the social demand to know the shakiness of the ground. Since the analysis using this microtremor array is dependent on the accuracy of the 3D geological ground map, we would like the readers to pay attention to the relationship between the two papers. In the paper on high-temperature and high-pressure rock deformation experiments, the main point is the research scenario for future earthquake forecasting. I think the readers will be able to deepen their understanding of the research on earthquake forecasting if the papers are read alongside other papers on earthquakes, active faults, and tsunamis.A wide range of research is conducted in “geological surveys,” and I hope we can introduce more papers from diverse aspects at the next opportunity.(Chikao KURIMOTO, Executive Editor)

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