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

<div>Relationship between <sup>3</sup>He/<sup>4</sup>He and the average values of CO<sub>2</sub> concentration and He concentration of soil gas. Red dots: values for wells DHT, HBLG, and WFS. Blue dots: values for wells TJYC, LHD, HET, and SWZ.</div>

Geofluids

fig11

Figure 11

Figure 11: Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China 