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In the neotecotnically active regions, the distribution of a lot of CO_2 discharges is restricted in the seismically active belts. It indicates that some CO_2 discharges could be related to seismic activity. The evidence of stable carbon isotopes suggests that CO_2 is mostly derived from the deep crust. Because the solubility of CO_2 increases with the rising fluid pressure, the deep-seated CO_2 always migrates and releases together with the geothermal water. The observational method of the TCD-CO_2 parameter has been reported.
In the neotecotnically active regions, the distribution of a lot of CO_2 discharges is restricted in the seismically active belts. It indicates that some CO_2 discharges could be related to seismic activity. The evidence of stable carbon isotopes suggests that CO_2 is mostly derived from the deep crust. Because the solubility of CO 2 increases with the rising fluid pressure, the deep-seated CO_2 always migrates and releases together with the geothermal water. The observational method of the TCD-CO_2 parameter has been reported.