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Natural gamma-ray spectrometry for Yata active fault area in Kinki District, southwest Japan



Natural gamma-ray spectrometry for Yata active fault area in Kinki District, southwest Japan



International Journal of Geoinformatics 3(4): 63-67



Yata fault is one of the active faults in Kinki district, south-west Japan. The fault activity is medium class and also its activeness in the past time is not clear. For estimating the fault condition near the ground surface, the natural gamma-ray survey using a multichannel gamma-ray analyzer with NaI scintillation detector was carried out over the Yata fault area. Natural gamma-ray spectral data were corrected at 44 sites by field survey. The fluctuation of natural radioactive nuclides. (super 40) K, (super 214) Bi and (super 208) Tl were mined from the gamma-ray spectral data, and the fluctuation ratio of (super 214) Bi/ (super 40) K, (super 214) Bi/ (super 208) Tl was mapped on the study area using GIS software. The result shows the fluctuation ratios of southeast area were higher than another area, where the geologic boundary has discontinuity on the fault line. The difference of these patterns of fluctuation ratio (super 214) Bi/ (super 40) K, and (super 214) Bi/ (super 208) Tl were due to weathering situation of the host rocks. The southeast block of Yata fault area may have been moved recently.

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Accession: 023091778

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