[AHW34-P16] The relationship between flow path of Beppu Onsen and S velocity distribution by microtremor array survey.
Keywords:Beppu, microtremor array survey, Flow path of Beppu Onsen
In order to clarify the relationship between these flow paths and the geological structure, microtremor array survey with a radius of 0.6 m to 350 m was conducted at 105 points and the three dimensional distribution of S wave velocity was obtained
As a result, in the southern area, it is clarified that Na - Cl type hot spring flow path is obstructed in the region with high S wave velocity, which is considered to be low permeability base at 300 m below sea level ( b.s.l.), and rounds from both sides.
On the other hand, in the northern region, the Ca - Mg - HCO3 type flow path was inflected to the north by hitting a region with high S - wave velocity with low water permeability at an 100 to 200m b.s.l. And at 400 to 600m b.s.l., Na - Cl type hot springs flowed down to the east part of the region with relatively high water permeability and moderate S wave velocity.