Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

<div>Plots showing <sup>3</sup>He/<sup>4</sup>He (R/Ra) versus <sup>4</sup>He/<sup>20</sup>Ne values for gas samples from the seven soil gas wells.</div>

Geofluids

fig8

Figure 8

Figure 8: Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China 