... investigation plane discontinuity volcanology asia government phyllosilicate slickenside borehole groundwater breccia geothermal area sumatra The 5th International Workshop on Rock Mechanics and Engineering Geology in Volcanic Fields (RMEGV2021) ©2021 JSRM & JSEG, ISBN 978-4-907430-05-4 ISRM2021...

... Abstract Aso volcano is an active volcano in Kyushu Island, southwest Japan. This volcano is characterized by a large caldera, extending 18 km east–west and 25 km north–south, where a central cone is located. Aso volcano has abundant groundwater resources and is an area where many spring...

... Abstract There are huge volume and good quality groundwater in volcanic fields, therefore the volcanic fields are estimated as suitable water resource area. However, because geological structures of aquifer in volcanic fields are often heterogeneous, it is not easy to estimate groundwater...

... Abstract The volcano stores a large amount of groundwater in the mountain body. Because the heated water coming from a magma activity around a volcano is rise from deeper ground, chemical variety is recognized in groundwater and heated water. On the other hand, it is assumed by experiments...

... or silty layer sometimes contains high compressive strength boulders formed by andesite over 1 meter in diameter. Furthermore, from the additional survey, we estimate that the groundwater level for the entire length almost reaches the ground surface. Therefore, with NATM under high hydraulic pressure...

... Abstract It’s important to predict in advance the volume and recharge area of discharge water in the tunnel. These are related to the structure of the aquifer, and the degree of connection between groundwater and surface water (well water, river water) is a key for prediction in advance...