Chemical and Noble Gas Isotope Compositions of Formation Gases from a 3 km Deep Scientific Borehole in the Koyna Seismogenic Zone, Western India

Figure 6

⁴He depth profiles from QMS measurements (red) and noble gas isotope analysis (blue) of gas samples collected during water flushing after core run 7/8. Error bars indicating uncertainty in the measurement are also shown. Samples from 1737 m and 2687 m depths were not analysed for noble gas isotopes.