[O-05] Poster presentations by senior high school students

[O05-P77] Methods of estimating the geology of the surrounding area by groundwater

Kotaro Kubo¹, *Takumi Yada¹, *Riki Nishiyama¹ (1.Miyazaki Prefectural Gokase Secondary School)

Keywords:Serpentinite, Hot spring, Groundwater

There is an alkaline hot spring in Gokase town, Miyazaki prefecture, where we live. The reason why the water is alkaline is presumed to be the effect of the igneous rock called serpentinite. Furthermore, when we measured the ph of the hot spring, it was 9.2. Also, we measured the ph of the hot springs in Takachiho Town, a next town with a low altitude, and the value was 8.3. From these facts, when groundwater in Gokase Town and Takachiho Town were connected, the value of ph dropped because the alkaline groundwater passed through the stratum of acidic rock on the way to Takachiho town. In addition, we research the hot spring in Beppu whether it has the same trend. By doing this, we made a hypothesis. We presume that the mineral affects the surrounding area by investigating the liquidity of groundwater.