Presumption of the distribution of the geological structure based on the geological survey and the topographic data in and around the Horonobe area

Sakai, Toshihiro; Matsuoka, Toshiyuki

JAEA-Research 2015-004, 109 Pages, 2015/06

JAEA-Research-2015-004.pdf:141.42MB
JAEA-Research-2015-004-appendix(CD-ROM).zip:128.66MB

We update the geologic map and the database of the geological mapping published by Funaki et al. (2005a) and Ota et al. (2007) based on geological survey and topographical analysis data in and around the Horonobe area. There are many geological survey data which are derived from natural resources (petroleum, natural gas and coal, etc.) exploration in and around Horonobe-cho. We also use these data in addition to data in Funaki et al. (2005a) and Ota et al. (2007)'s data. As results of this report, we also construct a digital geologic map and a digital database of geological survey using GIS. These results can be expected to improve the precision of modeling and analyzing of geological environment, and its long-term evaluation.

Modeling of radial dikes by topographical analysis using GIS for Quaternary volcanoes

Hiura, Yuki; Kawamura, Makoto; Umeda, Koji*; Niwa, Masakazu

no journal, , 

One of the technical issues related to volcanic and igneous activities is the sophistication of technology for grasping the range of influence of magma. To address this issue, it is important to accumulate survey cases, especially when the dike develops over a radius of 15 km from the center of the Quaternary volcano, but it lies beneath the existing volcanic body. It is practically difficult to grasp the distribution of the conduits and the dikes derived from them. Therefore, the purpose of this study was to develop a method for estimating the distribution range of dikes distributed under the Quaternary volcanic body based on topographical data such as digital elevation models. In this study, we used digital maps and GIS software to target six volcanoes, such as stratovolcanoes and calderas. The parameters were measured, and modeling of the three-dimensional distribution range of radial dikes was examined from each parameter for each altitude. As a result, the transition of the center of gravity position for each altitude suggests the transition of the center of activity in the process of forming the volcanic body to some extent, and it is possible to extract not only the activity of the central crater but also the activity of lateral volcanoes. This suggests the possibility of quantitative evaluation of the transition and stability of the conduit even in volcanoes whose activity history is not clear by applying this method.

Study on an evaluation technology related to the occurrence of volcanic and igneous activities; Efforts to advance technology to understand the range of influence of magma

Kawamura, Makoto; Nishiyama, Nariaki; Niwa, Masakazu; Umeda, Koji*

no journal, , 

As the efforts of the notation, "examination of the method of estimating the distribution range of the rock veins distributed under the Quaternary volcano body based on the topographical data of the numerical elevation model" and "Collection and organization of dikes from geological maps (database)" was carried out. These studies are expected to be used as basic information for evaluating the direction and range that are likely to be affected by the horizontal movement of magma due to future volcanic and igneous activities.