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Report No.
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Atmospheric methane concentration anomalies at the Aosawa Fault

Shimo, Michito*; Niwa, Masakazu   ; Yokoi, Satoru*; Yagi, Hiroshi*; Tokunaga, Tomochika*

This study focuses on the role of faults as pathways for gas migration from the deep subsurface and aims to detect trace gas seepage along these faults. For this purpose, methane concentrations near the surface across the Aosawa Fault, Yamagata Prefecture, were measured using Cavity Ring-Down Spectroscopy (CRDS). Notable increases in methane concentration were observed at anticipated fault locations on two transects across the Aosawa Fault. The measurement results suggest that the Aosawa Fault functions as a pathway for gas migration connected to deep underground methane sources, offering new perspectives on fault structures and their relation to the petroleum system in the study area.

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