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Tsanyao Frank Yang 1 , C.-C. Fu 1 , H.Y. Wen 1 , W.L. Hong 1 , S.J. Lin 2 and V. Walia 2

Soil Radon Flux in Hydrothermal Area of the Tatun Volcano Group, N. Taiwan and its Monitoring Results. Tsanyao Frank Yang 1 , C.-C. Fu 1 , H.Y. Wen 1 , W.L. Hong 1 , S.J. Lin 2 and V. Walia 2 1.Department of Geosciences, National Taiwan University

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Tsanyao Frank Yang 1 , C.-C. Fu 1 , H.Y. Wen 1 , W.L. Hong 1 , S.J. Lin 2 and V. Walia 2

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  1. Soil Radon Flux in Hydrothermal Area of the TatunVolcano Group, N. Taiwan and its Monitoring Results Tsanyao Frank Yang1, C.-C. Fu1, H.Y. Wen1, W.L. Hong1, S.J. Lin2 and V. Walia2 1.Department of Geosciences, National Taiwan University 2. National Center for Research on Earthquake Engineering, NARL, Taiwan

  2. Active Volcano ?? < 20 Ka

  3. Soil CO2 Station in Italy

  4. Why CO2 & Rn ?? • CO2 is, after water vapor, the most abundant gas phase dissolved into magma. • CO2 is one of the first gases to be exsolved and released from an ascending magma. • Increase in volcanic CO2 emission can be used as early indicators of magma up-rise. • Radon is trace gas and also sensitive to the magma activity. • Both CO2 and Radon sensors are commercially available ==>un-expensive and easy for continuously monitoring in corrosive environment !!

  5. METHOD CO2 flux measurement CO2 flux measurement again In situ soil Rn analysis • Soil gas sampling for gas comp and isotopic analysis by MS.

  6. Testing sites @ SYK

  7. Testing sites @ SYK S7 S10 S8 S6 S9 S4 S2 S1 S3 S5

  8. Site 5

  9. Site 6

  10. Site 7 1426.7 Bq/m3

  11. Summary of survey results Higher CO2 flux => higher radon flux => higher magma signals

  12. Configuration of Monitoring Station @SYK Equipped with:Rn & CO2 sensors which protected with plastic box and epoxy

  13. Station @SYK

  14. CO2 Result

  15. CO2 & Rn Result

  16. CONCLUSIONS • The soil gases show significant magma signals (high 3He/4He ratios, CO2 flux, and total sulfurs) at SYK hydrothermal area. • The first monitoring station was successfully setup at SYK hydrothermal area in Taiwan. It is equipped with CO2 and Rn sensors, which are protected with plastic box and epoxy, and then can be used for long term monitoring under corrosive environments. • Both CO2 flux and radon concentrations show significant variations. They are correlated well with other magmatic proxy (3He/4He ratios and total sulfurs etc.) and can be used for further monitoring on the local magma activity.

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