Spatial Distribution of Radon Gas Concentration by Considering the Lineament Densities Extracted from Digital Elevation Model (DEM) at Patuha Geothermal Field, West Java, Indonesia
Keywords:
COK, lineament density, m-STA, radon concentration, permeability zone, OKAbstract
Soil radon measurements is a technique that can be used for geothermal prospecting. In general, the concentration of Radon-222 (Rn) gas is associated with the fractures and faults traces. This study aims to modeling the near-surface permeability zone based on the spatial correlation between Rn gas concentrations as the primary variable and lineament structural density as the secondary variable by using multivariate geostatistical method named Ordinary Cokriging (COK) and Ordinary Kriging (OK). Radon gas concentrations were measured from 17 shallow drill holes and were collected over nine periods during 2020. In this study, the Digital Elevation Model (DEM) with 8.3-m resolution were extracted to produce three lineaments structural densities i.e., frequency, length, and intersection by using modified Segment Tracing Algorithm (m-STA) method which coverage area of 3.16 × 4.78 km. The three lineament density maps with grid dimension were generated. The major direction of lineament structural was in N85°E and N315°E which is like the major direction of regional and local faults in the study site. Three radon measurement sites i.e., TTN01, TTN02, and PA04 which is in the northern site showed higher concentration, while other sites mainly in northeastern and southern sites showed lower concentration. This methodology was applied in Patuha Geothermal Field (PGF), West Java, Indonesia.
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