Sabaefault
chudoin

鯖江断層

Quoted from Okamoto(2007)

Sirotubakiy
ama fault
Tenjozanfault

The relationship between the Tonoueyama Fault and the Sabae Fault is unknown

important information fordisaster prevention
measures

We would like to clarify the relationship between the twofaults and help with disaster prevention measures aroundthe Sabae Fault.

Methodtracer･･･ Material that traces the route of the fault

Tracer of the Sabae Fault
In a previous study conducted at Takefu High School,the tracer is ffluoride ion.

Sabae Fault Route Clarification

What about tracers on the Tonjozan Fault?

soda springsoda spring･･･ High concentrations of carbon dioxide dissolved in groundwater
TeranakaKamikouchi
KiyoneTakefu HS
Purchased and cited from Japan Map Center

High concentrations of carbon dioxide dissolved in groundwater・bicarbonate ionー（ HCO ） ３

Neutralization titration with 0.1mol/L hydrochloric acidreasent：Bromocresol green/methyl red ethanol solution_・Other ions

（F⁻ 、Cl⁻ 、NO 、SOion chromatography２−etc）
4

（unit：mg/L）

The water quality of the soda spring and the spring water at Chudoin is distinctly different.

Spring water and groundwater

fault crushing belt

Lateral movement

Rising soda springPrevious research（Adachi,2022）
Sites of high fluoride ion concentrations in springs andgroundwater are arranged in rows along the fault

Bicarbonate ions are effective tracers of the Tenjozan fault
Measuring the concentration ofbicarbonate ions, fluoride ions,etc. in spring water andgroundwater・Tracking the route of the Tonakamiyama Fault

・Clarification of the relationship between
the Tenjozan Fault and the Sabae Fault

Result

RangeFukui

Sabae fault

HinoRiver

Tenjozan fault

Sabae

Chudoin

JR Sabae
StationEchizen

Takefu HS

Ikeda

SundomePurchased and cited from Japan Map Centerunit(mg/L)

Purchased and cited from Japan Map CenterPurchased and cited from Japan Map Center

（unit：mg/L）

groundwater
Includes groundwater quality associated with both theTenjozan Fault and the Sabae Fault

Groundwater associated with two faults mixing
near underground passage

Sabae fault

Tenjozan fault

The Sabae fault is dominant
Purchased and cited from Japan Map CenterPurchased and cited from Japan Map CenterPurchased and cited from Japan Map CenterShirotubakiyamaFault

TenjozanFault
Quoted from Okamoto(2014)

Purchased and cited from Japan Map Center

SabaeFault

Shirotsubakiyama Fault

Sundome Fukui

Tenjozan Fault

Conclusion
１．Bicarbonate ions as tracers of the Tenjozan Fault areeffective.
２．That the Tenjozan Fault extends further west than theroute considered.

３．That the Tenjozan Fault extends further west than theroute considered The Tenjozan Fault stops just before theSabae Fault near the Sundome and does not intersect,indicating that the Sabae Fault is dominant.

Future Tasks
Clarification of the situation including
the actual location of the Tenjozan
Fault andthe Shirotsubakiyama Fault

thanks
We would like to thank all the professors who have helped
us in the course of our research.
・ Teaching about faults, ions in spring water, etc.
Fukui technical HS Dr.Takuo Okamoto

・Analysis of ions in spring water and groundwater
Research Institute of Education Science Education Section Section chief Taishu Imazawa

・ Teaching about the carbon dioxide spring in Sanriyama
simosinjotyo in Sabae city osamu kimizu

References
安達美悠ほか,2022．沖積層に覆われた断層のルート解明に挑む．武生高校課題研究論文集.
石塚千夏ほか,2020．湧き水を用いて断層のルートを探る．武生高校課題研究論文集．
環境省自然環境局,2014．鉱泉分析法指針（平成26年改訂）：163pp.
岡田篤正,1979．愛知県の地質・地盤(その４)(活断層)．愛知県防災会議地震部会．
岡本拓夫ほか,2007．鯖江断層トレンチ調査-経緯-.福井高専研究紀要(41).
岡本拓夫ほか,2008．2007年12月21日に鯖江市東部付近で発生したＭ4.5について．月刊地球,30(10).
岡本拓夫ほか,2010．福井県鯖江市付近に認められる低地震活動域とそのテクトニクス.福井高専研究紀要(44)．
岡本拓夫ほか,2014．鯖江市東部に認められる地震活動帯を分ける断層構造について.福井高専研究紀要(48).
大友奈々ほか,2021．湧き水を用いて村国山における断層のルートを解明．武生高校課題研究論文集．

Thank you for your listening