Geochemical spatial distribution characteristics of soil gas along the Lintan-Tanchang fault zone
The study on geochemical spatial distribution characteristics of gas along the fault zone is an important method for analyzing the regional structure,activity segmentation,and seismic risk of the fault.In this study,we took the Lintan-Tanchang fault zone as study area and ob-served the soil gas Hg and Rn concentrations in 9 survey lines.We analyzed the spatial distribution characteristics of gas concentration in different fault sections by combining the characteristics of fault activity and the heat flow density.The study show results that the Lintan-Tanchang fault zone has obvious segmentation features.Base on the fault activity characteristics,the Lintan-Tanchang fault could be divided into two segments:east and west.And the spatial distribution of soil gas geochemistry is correlated with heat flow and seismic activity;The western section of the fault is an area of high heat flow,and strong seismic occur frequently in this section,but small seismic activity is weak,with lower Hg and Rn concentration intensity.While in areas with lower heat flow in eastern segment of fault,there are fewer strong seismic but intense small seismic ac-tivity,with higher Hg and Rn concentrations intensity.This study provides evidence of subsurface fluid activity in the study area,which is vital in tracing the faults and active segments with seismic risk.
万方数据
维普
