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We are studying about the mapping of volcanic fluid influence for CO_2 in order to estimate flux of magmatic volatiles in Shimabara Peninsula. In the present study, the carbon isotopic approach was used for identification of magmatic contribution in soil air. A large contribution of magmatic CO_2 in a dissolved carbonate of spring water in this region has already been reported (Ohsawa et al., 2002). Use of the soil air has advantages that it is easy to measure flux from soil surface and collect sample. We have collected ca. 45 soil air samples in and around Unzen Volcano, and they are analyzed for CO_2 concentration, \u03b4^<13>C and \u03b4^<14>C using the portable gas detector, IR-MS and AMS. The CO_2 concentration inside Unzen Graben showed higher than that outside. This suggests that the magmatic contribution is high inside the graben. The flux of CO_2 from ground surface was high at costal area. The spatial variation of flux might cause by the difference of biogenic activity at each point. The biogenic impact might be stronger than the magmatic one for the CO_2 flux, since the almost costal region used for farm field and might contain much higher amount of organic materials. The magmatic CO_2 showed high contribution in/around Shimabara City located ca. 7km east from Unzen Volcano, which agrees well with the result from ground water study using carbon isotopes (Ohsawa et al. 2002). It is noteworthy that the high contribution, flux and concentration of CO_2 are appeared along the Akamatsudani fault zone located southeast of the volcano. Our observation across the Akamatsudani fault zone was also represented to be a remarkable peak of CO_2 concentration and \u03b4^<13>C values. These suggest that magmatic fluid comes up along the fracture zone like as fault system of Unzen Graben.","subitem_description_type":"Abstract"}]},"item_9_description_5":{"attribute_name":"\u5185\u5bb9\u8a18\u8ff0","attribute_value_mlt":[{"subitem_description":"\u7b2c15\u56de\u540d\u53e4\u5c4b\u5927\u5b66\u30bf\u30f3\u30c7\u30c8\u30ed\u30f3\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u30b7\u30f3\u30dd\u30b8\u30a6\u30e0(\u5e73\u621014\u5e74(2002\u5e74\u5ea6)\u5831\u544a Proceedings of the 15th Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2002 \u65e5\u6642:\u5e73\u621015 (2003)\u5e741\u670830\u65e5(\u6728)\uff6431\u65e5(\u91d1) \u4f1a\u5834:\u540d\u53e4\u5c4b\u5927\u5b66\u30b7\u30f3\u30dd\u30b8\u30aa\u30f3 Date:January 30th and 31st,2003 Place:Nagoya University Symposion 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